Is there a formula to relate torque speed characteristics when a SmartMotor is used with a power supply delivering less than 45V?
There is a complex relationship between the torque-speed curves and the applied voltage. You can predict the peak torque at a given speed by the formula: Torque = Maximum current x Torque constant Maximum current = the unit’s current limit or max motor coil current, whichever is lower. For the SM17 and 23s, the unit current limit is 12.5A, while that for the SM34 is 40A. The RTC is 3A. The max coil current is calculated as follows: max coil current = (bus voltage – back EMF) coil resistance (where back EMF = motor voltage constant x RPM) The continuous torque is a function of heat dissipation. Bus voltage has a negligible effect, as long as it is within the specified operating range.
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