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Electrical Engineering

Electric Motor Torque Simulator

Speed-torque curve and efficiency map for DC motor

速度-トルク：\(\omega = (V - I \cdot R_a)/K_e\)、トルク：\(T = K_e \cdot I\)（Ke=Kt）

Operating Speed
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Operating Current
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Efficiency
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FAQ

What is the speed-torque characteristic?
A linear relationship: as torque (current) increases, back-EMF decreases and speed drops. Ranges from no-load speed to stall torque.
What is the back-EMF constant Ke?
The coefficient of the counter-EMF generated as the motor spins. Since Ke=Kt in SI units, it also equals the torque constant.
Where is peak efficiency?
Typically near 1/3 to 1/2 of the stall torque, between no-load and stall conditions.
How do BLDC and brushed DC motors differ?
BLDC motors lack brushes (longer life) but require electronic commutation. Their speed-torque equations are essentially the same.