Hence it can be transiently outside of the 0 to 100 percent range due to rotor inertia. The efficiency of the brushless DC motor is calculated as the ratio of mechanical power out to electrical power in. At 2 seconds, the braking pin Vbrk is set high, and the motor slows to zero rpm. After one second, the Vdir pin is set high, and the motor reverses to -40,000rpm. In this model, the speed demand is set to 2V which corresponds to 40,000rpm. If the voltage at the Vbrk pin goes high, then Vref is overridden and speed demand set to zero to implement a braking action.
Speed demand is set by the voltage presented at the Vref pin, and motor direction by the voltage presented at the Vdir pin. An inner feedback loop controls current and an outer feedback loop controls motor speed. This model of a brushless DC motor uses a standard configuration. If viewing the model in Simulink®, select the Motor and driver block, and type Ctrl+U to look under the mask and see the model structure. The motor and driver are modeled as a single masked subsystem.
a servomotor) can be constructed and parameterized based on datasheet information. This example shows how a system-level model of a brushless DC motor (i.e.
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