can I just call R3_2_TurnOnLowSides( PWMC_Handle_t * pHdl ) for regenerative braking ?

[dannypkchan]

Hi,

R3_2_TurnOnLowSides is shorted motor 3 phases to ground, so when my ebike is downhill will motor power will transfer to DC BUS so call regenerative braking ?

Danny

[DTort.1]

Hi,

Calling R3_2_TurnOnLowSides( PWMC_Handle_t * pHdl ) will result in dissipative braking, not regenerative. In this case, the kinetic energy of the system will be dissipated into heat on the motor windings.

[dannypkchan]

Hi DTort,

wow, thanks for the quick reply, can you help to suggest how to regenerate energy when my bike down hill ?

1. when brake action is interrupted (brake lever trigger external interrupt), then set speed to very slow e.g. 10? MC_ProgramSpeedRampMotor1(10, 0);

if this is the solution, can I change the target speed value for different amount of regenerate energy e.g.

MC_ProgramSpeedRampMotor1(10, 0);

MC_ProgramSpeedRampMotor1(20, 0);

MC_ProgramSpeedRampMotor1(30, 0);

thanks,

danny

[DTort.1]

As ST answered the same question, at the moment there are no direct functions for regenerative braking in the Motor SDK.

https://community.st.com/s/question/0D53W000016MitiSAC/electric-brake-function-for-pmsm-motor-control

But, in general, speed reduction through MC_ProgramSpeedRampMotor1 will work partly as regenerative braking, but this cannot be precisely controlled. That is, there is no some function that would regulate the braking torque.

[dannypkchan]

thanks DTort