![]() Unfortunately, these windings have the highest resistance as well. ![]() Rule #2 requires motors with high generator constant. As an alternative, the motor speed can be enhanced by the use of a gearhead (see below). Rule #2: Without considering the load, the winding should have a speed constant of kn < n/u or smaller. Smaller motors have higher speed constants. There are only a few high resistance windings on larger motors that satisfy this requirement. Such windings are hard to find in the maxon portfolio. ![]() Generating 10 V or more at 1000 rpm requires a speed constant of only 100 rpm/V or less. That’s quite a low speed for small motors. Many generators are operated at speeds of 1000 rpm or below. Hall sensors are not needed on brushless motors. For the generation of AC voltage, select a brushless EC motor and connect 2 phases only. Rule #1: For generation of DC voltage select a brushed DC motor or use a brushless EC (BLDC) motor with voltage rectifier. In the following, a few rules for a successful selection. The basic calculations between speed and voltage as well as current and torque are very simple. Since our motors are very efficient, this is also true when operated as generators. Every now and then, I’m asked about the suitability of maxon DC motors for the use as a generator.
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