MC Series Brushless Driver User Manual
26
2023 - September version V1.2
3.5 Braking function
The drive is equipped with free stop and quick brake functions, which can be configured according
to actual needs.
1. Free stop: The motor is disabled and the rear axle stops by inertia.
2. Rapid braking: short-circuit the three-phase lines of the motor to quickly consume the motor
energy and achieve rapid braking.
Parameter calculation:
Since the motor brakes quickly, the kinetic energy will be consumed by the motor, which is
equivalent to a generator. At this time, the three-phase winding is short-circuited and the motor will
generate a large current.
Theoretical calculation formula for current (approximate):
It is known that the speed during braking is n 0 , the speed constant is Ke , and the terminal resistance
is R .
The back electromotive force U at this time is: U=n 0 / Ke
The winding current I at this time is: I =U/R
Please note that the current during braking should not exceed the maximum continuous current of
the motor, otherwise the large current will cause the motor to heat up and repeated use will damage
the motor. Rapid braking is not recommended at this time.
External consumption circuit:
If frequent braking is required and the calculated current exceeds the maximum continuous current,
it is recommended to add a peripheral resistance circuit to consume energy.
(At this time, the three-phase line is not short-circuited by the driver, and the host computer braking
mode does not need to select fast braking)
By controlling the relay, the three-phase line of the motor is switched from the three-phase output
port of the driver to the resistance consumption circuit when braking is required.
It is necessary to pay attention to the mechanical response time of the relay. The signal of the control
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