{"id":11206,"date":"2026-09-07T11:19:50","date_gmt":"2026-09-07T11:19:50","guid":{"rendered":"https:\/\/micromotorpro.com\/?p=11206"},"modified":"2026-09-07T11:19:53","modified_gmt":"2026-09-07T11:19:53","slug":"how-to-read-dc-motor-performance-curve","status":"publish","type":"post","link":"https:\/\/micromotorpro.com\/de\/how-to-read-dc-motor-performance-curve\/","title":{"rendered":"How to Read a DC Motor Performance Curve"},"content":{"rendered":"<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><div class=\"wp-block-post-author-name\">Joey Chan<\/div>\n\n\n<ul class=\"wp-block-social-links is-layout-flex wp-block-social-links-is-layout-flex\"><li class=\"wp-social-link wp-social-link-linkedin  wp-block-social-link\"><a href=\"https:\/\/www.linkedin.com\/in\/joey-chan-92198b374\/\" class=\"wp-block-social-link-anchor\" target=\"_blank\" rel=\"noopener\"><svg width=\"24\" height=\"24\" viewbox=\"0 0 24 24\" version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M19.7,3H4.3C3.582,3,3,3.582,3,4.3v15.4C3,20.418,3.582,21,4.3,21h15.4c0.718,0,1.3-0.582,1.3-1.3V4.3 C21,3.582,20.418,3,19.7,3z M8.339,18.338H5.667v-8.59h2.672V18.338z M7.004,8.574c-0.857,0-1.549-0.694-1.549-1.548 c0-0.855,0.691-1.548,1.549-1.548c0.854,0,1.547,0.694,1.547,1.548C8.551,7.881,7.858,8.574,7.004,8.574z M18.339,18.338h-2.669 v-4.177c0-0.996-0.017-2.278-1.387-2.278c-1.389,0-1.601,1.086-1.601,2.206v4.249h-2.667v-8.59h2.559v1.174h0.037 c0.356-0.675,1.227-1.387,2.526-1.387c2.703,0,3.203,1.779,3.203,4.092V18.338z\"><\/path><\/svg><span class=\"wp-block-social-link-label screen-reader-text\">LinkedIn<\/span><\/a><\/li><\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p>Published: SEPTEMBER 7, 2026<\/p>\n\n\n\n<p><\/p>\n<\/div>\n<\/div>\n\n\n\n<p>The true purpose of a DC motor performance curve is not to show an engineer the motor&#8217;s maximum speed or maximum torque in isolation, but to help evaluate whether a specific operating point meets the requirements of a practical application.<\/p>\n\n\n\n<p>For example, when an application requires a motor to maintain a target speed under a specific load, knowing only the No-load Speed is insufficient for proper motor selection. Engineers must also verify the actual Speed, Current, Mechanical Output Power, and Efficiency at that specific torque, while ensuring that the current, temperature rise, and duty cycle remain within allowable operating limits.<\/p>\n\n\n\n<p>A practical reading order is: Required Torque \u2192 Loaded Speed \u2192 Current \u2192 Input Power \u2192 Output Power \u2192 Efficiency \u2192 Thermal Limit<\/p>\n\n\n\n<p>This article uses the 3.7 V winding variant of the<a href=\"https:\/\/micromotorpro.com\/de\/produkt\/6mm-coreless-motor-12mm-tsl-cl0612\/\" data-type=\"link\" data-id=\"https:\/\/micromotorpro.com\/product\/6mm-coreless-motor-12mm-tsl-cl0612\/\"> 6 mm Coreless DC Motor TSL-CL0612 (TSL-CL0612-06037)<\/a> as a case study to cross-verify speed, current, power, and efficiency at the same operating point.<\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Wichtigste Erkenntnisse<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Engineers must evaluate the operating point by starting from the required torque.<\/li>\n\n\n\n<li>No-load speed and stall torque cannot serve as continuous operating metrics.<\/li>\n\n\n\n<li>Speed\/torque slope and torque constant can cross-verify speed and current data.<\/li>\n\n\n\n<li>Mathematical formulas can confirm the conversion between electrical and mechanical power.<\/li>\n\n\n\n<li>The maximum power point does not equal the maximum efficiency or continuous operating point.<\/li>\n\n\n\n<li>Actual terminal voltage drops and driver limits will alter real motor performance.<\/li>\n\n\n\n<li>Thermal rise, duty cycles, and lifespan requirements must dictate the continuous operating point.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What Does a DC Motor Performance Curve Show?<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"958\" height=\"704\" src=\"https:\/\/micromotorpro.com\/wp-content\/uploads\/2025\/08\/6mm-coreless-motor-12mm-tsl-cl0612-performance.webp\" alt=\"6mm coreless motor 12mm tsl cl0612 performance\" class=\"wp-image-8515\" srcset=\"https:\/\/micromotorpro.com\/wp-content\/uploads\/2025\/08\/6mm-coreless-motor-12mm-tsl-cl0612-performance.webp 958w, https:\/\/micromotorpro.com\/wp-content\/uploads\/2025\/08\/6mm-coreless-motor-12mm-tsl-cl0612-performance-300x220.webp 300w, https:\/\/micromotorpro.com\/wp-content\/uploads\/2025\/08\/6mm-coreless-motor-12mm-tsl-cl0612-performance-768x564.webp 768w\" sizes=\"(max-width: 958px) 100vw, 958px\" \/><figcaption class=\"wp-element-caption\">6mm coreless motor 12mm tsl cl0612 performance<\/figcaption><\/figure>\n\n\n\n<p>A typical DC motor performance curve plots Torque on the horizontal axis to illustrate how Speed, Current, Output Power, and Efficiency vary with changing load.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Curve \/ Parameter<\/strong><\/td><td><strong>Primary Question Answered<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Torque\u2013Speed Curve<\/strong><\/td><td>How much speed can the motor maintain as the load increases?<\/td><\/tr><tr><td><strong>Current Curve<\/strong><\/td><td>How much current is drawn at the target torque?<\/td><\/tr><tr><td><strong>Electrical Input Power<\/strong><\/td><td>How much electrical power does the motor draw from the supply?<\/td><\/tr><tr><td><strong>Mechanical Output Power<\/strong><\/td><td>How much mechanical power is actually delivered at the shaft?<\/td><\/tr><tr><td><strong>Efficiency Curve<\/strong><\/td><td>What percentage of input electrical power is converted into mechanical output?<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Curve formats vary by manufacturer. Some directly display Efficiency, while others only provide Voltage, Current, Torque, and Speed, requiring formulas for calculation.<\/p>\n\n\n\n<p>Before reading a curve, always verify:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Exact motor model and winding version<\/li>\n\n\n\n<li>Rated or test voltage<\/li>\n\n\n\n<li>Units for torque, speed, and current<\/li>\n\n\n\n<li>Whether the curve applies to a bare motor or a gearmotor<\/li>\n\n\n\n<li>Ambient temperature and test conditions<\/li>\n\n\n\n<li>Whether the data represents instantaneous test values or continuous ratings<\/li>\n<\/ul>\n\n\n\n<p>If the model, winding, or voltage differs, the data cannot be used directly\u2014even if the curve shape appears identical.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Are Torque, Speed, and Current Related?<\/h2>\n\n\n\n<p>For permanent magnet brushed DC motors operating within a limited range at a constant voltage, the Torque\u2013Speed relationship can be approximated as a linear decline.<\/p>\n\n\n\n<p>As load torque increases, the motor requires more armature current to generate electromagnetic torque. Higher current causes an increased voltage drop across the winding resistance, leaving less voltage for Back EMF, which results in a speed drop.<\/p>\n\n\n\n<p>Two key boundary points are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>No-load point:<\/strong> External load torque approaches zero, and motor speed approaches its maximum value at that voltage.<\/li>\n\n\n\n<li><strong>Stall point:<\/strong> The rotor stops, speed drops to zero, and current and torque approach their stall values.<\/li>\n<\/ul>\n\n\n\n<p>Real operating points lie between these two boundaries. No-load Speed cannot serve as the loaded operating speed, nor can Stall Torque be used for continuous operation.<\/p>\n\n\n\n<p>In a simplified model, the relationship between torque and current is expressed as:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>T \u2248 K\u209c \u00d7 (I \u2212 I\u2080)<\/strong><\/p>\n\n\n\n<p>Where:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>T<\/strong>: Output torque<\/li>\n\n\n\n<li><strong>K\u209c<\/strong>: Torque constant<\/li>\n\n\n\n<li><strong>I<\/strong>: Motor current<\/li>\n\n\n\n<li><strong>I\u2080<\/strong>: No-load current<\/li>\n<\/ul>\n\n\n\n<p>Subtracting <strong>I\u2080<\/strong> accounts for the current required to overcome internal losses such as brush friction, bearing resistance, and windage, even without an external load. This is an engineering approximation, as actual frictional losses can vary with speed and temperature.<\/p>\n\n\n\n<p><a href=\"https:\/\/web.mit.edu\/drela\/Public\/web\/qprop\/motor2_theory.pdf\" target=\"_blank\" rel=\"noopener\">The MIT DC motor model<\/a> similarly expresses terminal voltage as the combination of Back EMF and resistance voltage drop, correlating shaft torque with current minus internal loss current.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Input Power, Output Power, and Efficiency<\/h2>\n\n\n\n<p>Electrical Input Power and Mechanical Output Power must not be confused.<\/p>\n\n\n\n<p>Electrical input power:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>P\u1d62\u2099 = V \u00d7 I<\/strong><\/p>\n\n\n\n<p>Mechanical output power:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>P\u2092\u1d64\u209c = T \u00d7 \u03c9<\/strong><\/p>\n\n\n\n<p>When speed is expressed in rpm:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>\u03c9 = 2\u03c0n \u00f7 60<\/strong><\/p>\n\n\n\n<p>Therefore:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>P\u2092\u1d64\u209c = T \u00d7 2\u03c0n \u00f7 60<\/strong><\/p>\n\n\n\n<p><em>Note: Torque must be in N\u00b7m and speed in rpm to yield power in W.<\/em><\/p>\n\n\n\n<p>Motor efficiency:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>\u03b7 = P\u2092\u1d64\u209c \u00f7 P\u1d62\u2099 \u00d7 100%<\/strong><\/p>\n\n\n\n<p>At the no-load point, speed is high but torque is near zero, resulting in near-zero mechanical output power. At the stall point, torque reaches its maximum, but speed is zero, again yielding zero mechanical output power. Consequently, Output Power peaks between no-load and stall.<\/p>\n\n\n\n<p>For an ideal linear Torque\u2013Speed model, Maximum Mechanical Power occurs near half of the Stall Torque and half of the No-load Speed. <a href=\"https:\/\/sites.google.com\/a\/eng.ucsd.edu\/archive-mae3-fall-2019\/machine-design\/dc-motors\" target=\"_blank\" rel=\"noopener\">UC San Diego DC motor<\/a> instructional materials demonstrate this idealized relationship.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>However:<\/strong>Maximum Power Point \u2260 Maximum Efficiency Point \u2260 Recommended Continuous Operating Point<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">Real Example: TSL-CL0612-06037<\/h2>\n\n\n\n<p>This section analyzes the 3.7 V winding variant of the TSL-CL0612 series:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Parameter<\/th><th>TSL-CL0612-06037<\/th><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Nominal Voltage<\/td><td>3.7 V<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Leerlaufdrehzahl<\/td><td>48,100 rpm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Leerlaufstrom<\/td><td>45 mA<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Maximum Efficiency<\/td><td>55%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Speed at Maximum Efficiency<\/td><td>38,700 rpm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Current at Maximum Efficiency<\/td><td>187 mA<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Torque at Maximum Efficiency<\/td><td>0.94 g\u00b7cm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Blockierstrom<\/td><td>0.77 A<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Haltemoment<\/td><td>4.83 g\u00b7cm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Terminal Resistance<\/td><td>4.8 \u03a9<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Torque Constant<\/td><td>6.7 g\u00b7cm\/A<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Speed\/Torque Slope<\/td><td>9,940 rpm\/(g\u00b7cm)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>These parameters are interdependent. Three cross-checks demonstrate their consistency at a single operating point.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Torque\u2013Speed Cross-Check <\/h4>\n\n\n\n<p>Starting from No-load Speed:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>n \u2248 n\u2080 \u2212 9,940T<\/strong><\/p>\n\n\n\n<p>Substituting:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>T = 0.94 g\u00b7cm<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>n \u2248 48,100 \u2212 9,940 \u00d7 0.94 \u2248 38,756 rpm<\/strong><\/p>\n\n\n\n<p>In the product sheet, the Speed at Maximum Efficiency is 38,700 rpm, while the linear model yields a calculated value of approximately 38,756 rpm, showing a difference of around 56 rpm. This discrepancy only indicates that the calculated result is consistent with the standard specification value, and <strong>does not mean the speed tolerance for each individual motor is merely 0.15%<\/strong>. <\/p>\n\n\n\n<p>The performance curves are derived from sample measurements, and values listed in the product sheet shall be regarded as typical parameters for reference\u2011standard motors. Actual speed for individual motors normally allows a deviation of approximately \u00b110%. Accordingly, both the calculated and measured results fall within the normal error margin.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Torque\u2013Current Cross-Check<\/h4>\n\n\n\n<p>Using:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>I \u2248 I\u2080 + T \u00f7 K\u209c<\/strong><\/p>\n\n\n\n<p>Substituting values:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>I \u2248 0.045 + 0.94 \u00f7 6.7 \u2248 0.185 A<\/strong><\/p>\n\n\n\n<p>The calculated result is approximately 185\u202fmA, while the corresponding current in the product sheet is 187\u202fmA. This minor discrepancy originates from parameter rounding.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Power and Efficiency Cross-Check<\/h4>\n\n\n\n<p>Electrical input power:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>P\u1d62\u2099 = 3.7 \u00d7 0.187 \u2248 0.692 W<\/strong><\/p>\n\n\n\n<p>Converting:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>0.94 g\u00b7cm \u2248 9.21 \u00d7 10\u207b\u2075 N\u00b7m<\/strong><\/p>\n\n\n\n<p>Angular velocity at 38,700 rpm:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>\u03c9 = 2\u03c0 \u00d7 38,700 \u00f7 60 \u2248 4,053 rad\/s<\/strong><\/p>\n\n\n\n<p>Mechanical output power:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>P\u2092\u1d64\u209c \u2248 9.21 \u00d7 10\u207b\u2075 \u00d7 4,053 \u2248 0.373 W<\/strong><\/p>\n\n\n\n<p>Efficiency:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>\u03b7 \u2248 0.373 \u00f7 0.692 \u00d7 100% \u2248 54.0%<\/strong><\/p>\n\n\n\n<p>This matches closely with the 55% Maximum Efficiency on the datasheet. The approx 1% difference stems from rounding across Torque, Speed, Current, and unit conversions.<\/p>\n\n\n\n<p>The value of this exercise lies in using the Speed\/Torque Slope, Torque Constant, and power equations to ensure that Torque, Speed, Current, and Efficiency correspond accurately at a given operating point.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Stall, Maximum Power, and Continuous Operation<\/h2>\n\n\n\n<p>The TSL-CL0612-06037 has a Terminal Resistance of 4.8 \u03a9. At stall, speed and Back EMF drop to zero, yielding the simplified resistance model:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>I\u209b\u209c\u2090\u2097\u2097 \u2248 V \u00f7 R<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>I\u209b\u209c\u2090\u2097\u2097 \u2248 3.7 \u00f7 4.8 \u2248 0.771 A<\/strong><\/p>\n\n\n\n<p>This calculated value aligns with the 0.77 A Stall Current listed on the datasheet.<\/p>\n\n\n\n<p>Electrical input power at stall:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>P\u1d62\u2099 \u2248 3.7 \u00d7 0.77 \u2248 2.85 W<\/strong><\/p>\n\n\n\n<p>Because speed is zero:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>P\u2092\u1d64\u209c = T \u00d7 0 = 0<\/strong><\/p>\n\n\n\n<p>In a simplified model ignoring brush and wiring losses, almost all input power converts to winding heat. Therefore, Stall Torque represents a performance boundary, not a Continuous Torque rating.<\/p>\n\n\n\n<p>According to the ideal linear model, the Maximum Power Point occurs near:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Torque\uff1a4.83 \u00f7 2 \u2248 2.42 g\u00b7cm<\/li>\n\n\n\n<li>Speed\uff1a48,100 \u00f7 2 \u2248 24,050 rpm<\/li>\n<\/ul>\n\n\n\n<p>However, this does not mean the motor can run continuously at this point. Current and copper losses rise significantly in the Maximum Power region.<\/p>\n\n\n\n<p>Continuous operation capability requires evaluating:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Continuous Current and Continuous Torque limits<\/li>\n\n\n\n<li>Maximum allowable winding temperature<\/li>\n\n\n\n<li>Ambient operating temperature<\/li>\n\n\n\n<li>Mounting configuration and heat dissipation<\/li>\n\n\n\n<li>Duty cycle<\/li>\n\n\n\n<li>Brush and commutator lifespan<\/li>\n<\/ul>\n\n\n\n<p>While published specs define characteristic points like No-load, Max Efficiency, and Stall, they do not fully define continuous thermal limits.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Voltage, Driver Limits, and Temperature Matter<\/h2>\n\n\n\n<p>Performance curves correspond to specific test voltages\u20143.7 V in this example. If an actual system delivers only 3.3 V to the motor terminals under load, the 3.7 V curve data cannot be applied directly.<\/p>\n\n\n\n<p>Real-world performance is also influenced by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Battery voltage sag<\/li>\n\n\n\n<li>PWM duty cycle<\/li>\n\n\n\n<li>Driver voltage drop<\/li>\n\n\n\n<li>Driver current limiting<\/li>\n\n\n\n<li>Cable and connector resistance<\/li>\n\n\n\n<li>Power supply current capacity<\/li>\n<\/ul>\n\n\n\n<p>If a motor driver enforces a current limit, performance in high-torque regions will truncate early, causing the actual Torque\u2013Speed relationship to deviate from the original curve. Always measure the loaded Motor Terminal Voltage rather than relying solely on the power supply nameplate rating.<\/p>\n\n\n\n<p>Temperature also alters performance. As copper winding temperature rises, Resistance increases. At a given supply voltage and target torque, higher resistance voltage drops leave less voltage for Back EMF, causing thermal-state speed to fall below cold-test results.<\/p>\n\n\n\n<p>Consequently, a performance curve measured over a short duration at room temperature does not represent all ambient temperatures or continuous operating conditions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Practical Reading Workflow and Common Mistakes<\/h2>\n\n\n\n<p>When reviewing a new DC motor performance curve, follow this sequence:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Confirm the Motor Model, Winding, Voltage, Units, and test conditions.<\/li>\n\n\n\n<li>Start from the Required Torque rather than No-load Speed or Stall Torque.<\/li>\n\n\n\n<li>Read the Loaded Speed at the target Torque.<\/li>\n\n\n\n<li>Read the corresponding Current, then verify the power supply, driver, and wiring harness.<\/li>\n\n\n\n<li>Separately calculate Electrical Input Power and Mechanical Output Power.<\/li>\n\n\n\n<li>Calculate Efficiency, checking units and data for internal consistency.<\/li>\n\n\n\n<li>Finally, check Continuous Current, Temperature, Duty Cycle, and Lifetime limits.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Common Mistake<\/strong><\/td><td><strong>Why It Is Wrong<\/strong><\/td><td><strong>Correct Approach<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Using No-load Speed as operating speed<\/strong><\/td><td>Speed drops when load is applied<\/td><td>Read Speed at the Required Torque<\/td><\/tr><tr><td><strong>Using Stall Torque for continuous operation<\/strong><\/td><td>High current causes excessive heating at stall<\/td><td>Verify Continuous and Thermal Limits<\/td><\/tr><tr><td><strong>Looking only at the Torque\u2013Speed Curve<\/strong><\/td><td>Ignores current draw and temperature rise<\/td><td>Read Current simultaneously<\/td><\/tr><tr><td><strong>Assuming V \u00d7 I is output power<\/strong><\/td><td>V \u00d7 I represents Electrical Input Power<\/td><td>Calculate output power using T \u00d7 2\u03c0n\/60<\/td><\/tr><tr><td><strong>Equating Max Efficiency with Max Power<\/strong><\/td><td>They occur at different operating points<\/td><td>Evaluate and calculate each separately<\/td><\/tr><tr><td><strong>Assuming curve reachability implies continuous operation<\/strong><\/td><td>Characteristic limits differ from Continuous Ratings<\/td><td>Verify against temperature, duty cycle, and lifespan<\/td><\/tr><tr><td><strong>Mixing data across different windings<\/strong><\/td><td>Different windings in the same series vary in specs<\/td><td>Stick strictly to the exact model and winding<\/td><\/tr><tr><td><strong>Ignoring actual terminal voltage drop<\/strong><\/td><td>Drivers and wiring induce voltage drops<\/td><td>Measure Motor Terminal Voltage under load<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Performance curves serve well for initial winding selection and target point verification, but physical sample testing and thermal validation remain necessary.<\/p>\n\n\n\n<p>If project requirements already specify Voltage, Loaded Speed, Continuous Torque, Starting Load, Duty Cycle, mounting dimensions, and ambient temperature, refer to the <a href=\"https:\/\/micromotorpro.com\/de\/produktkategorie\/gleichstrommotor\/\">TSL Motor DC Motor Series<\/a> or <a href=\"https:\/\/micromotorpro.com\/de\/produktkategorie\/gleichstrommotor\/kernloser-gleichstrommotor\/\" data-type=\"link\" data-id=\"https:\/\/micromotorpro.com\/product-category\/dc-motor\/coreless-dc-motor\/\">Coreless DC Motor Series<\/a>.<\/p>\n\n\n\n<p>For the formal design-in phase, review datasheets, engineering drawings, and test reports available at the <a href=\"https:\/\/micromotorpro.com\/de\/tsinglin-motor-download-center\/\">TSL Motor Download Center<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions<\/h2>\n\n\n\n<h4 class=\"wp-block-heading\">How do you read a DC motor performance curve?<\/h4>\n\n\n\n<p>First, verify the motor model, winding, test voltage, and units. Starting from the required torque, read the corresponding speed and current, then calculate input power, output power, and efficiency. Finally, verify continuous current, temperature, duty cycle, and lifespan limits.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Why does DC motor current increase with torque?<\/h4>\n\n\n\n<p>A permanent magnet DC motor requires higher armature current to generate greater electromagnetic torque. Because even an unloaded motor draws current to overcome brush friction, bearing resistance, and internal losses, the Torque\u2013Current relationship must account for No-load Current.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Is stall torque safe for continuous operation?<\/h4>\n\n\n\n<p>No. At stall, speed and Back EMF drop to zero, causing high current draw and rapid winding heat accumulation. Stall Torque represents a short-term performance boundary and must not be used as a Continuous Torque rating.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fazit<\/h2>\n\n\n\n<p>The key to correctly reading a DC motor performance curve is not finding the highest numbers on the chart, but identifying the actual Operating Point. Engineers should begin with the required torque and systematically evaluate the corresponding speed, current, input power, output power, and efficiency.<\/p>\n\n\n\n<p>The TSL-CL0612-06037 case study illustrates how Torque, Speed, Current, and Efficiency at a single operating point can be cross-verified using the Speed\/Torque Slope, Torque Constant, Resistance, and power formulas. This method confirms curve accuracy while helping identify unit conversion errors, winding mix-ups, or parameter inconsistencies.<\/p>\n\n\n\n<p>Finally, always distinguish Performance Capability from Continuous Capability. Stall Torque, Maximum Power, and Maximum Efficiency are feature points on a curve; a viable production design point must independently satisfy current, temperature, duty cycle, and lifespan requirements.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Published: SEPTEMBER 7, 2026 The true purpose of a DC motor performance curve is not to show an engineer the motor&#8217;s maximum speed or maximum torque in isolation, but to help evaluate whether a specific operating point meets the requirements of a practical application. For example, when an application requires a motor to maintain a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":11207,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[93],"tags":[],"class_list":["post-11206","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/micromotorpro.com\/de\/wp-json\/wp\/v2\/posts\/11206","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/micromotorpro.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/micromotorpro.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/micromotorpro.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/micromotorpro.com\/de\/wp-json\/wp\/v2\/comments?post=11206"}],"version-history":[{"count":1,"href":"https:\/\/micromotorpro.com\/de\/wp-json\/wp\/v2\/posts\/11206\/revisions"}],"predecessor-version":[{"id":11208,"href":"https:\/\/micromotorpro.com\/de\/wp-json\/wp\/v2\/posts\/11206\/revisions\/11208"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/micromotorpro.com\/de\/wp-json\/wp\/v2\/media\/11207"}],"wp:attachment":[{"href":"https:\/\/micromotorpro.com\/de\/wp-json\/wp\/v2\/media?parent=11206"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/micromotorpro.com\/de\/wp-json\/wp\/v2\/categories?post=11206"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/micromotorpro.com\/de\/wp-json\/wp\/v2\/tags?post=11206"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}