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Regenerative braking

Rahul Sharma
Expert 2725 points

Dear Team,

According to the image attached i have some doubts regarding Regenerative braking.

1) Please correct me if i am wrong that the Regenerative braking will only occur when there is no input voltage or current is given (under free run) to the motor and motor is providing the current, So why there is concept of providing negative Iq ref value? please elaborate.

2) In regenerative braking the motor should act as a battery charger that provides constant voltage(irrespective of current value) because battery lines are directly connected to the controller. So How it can be done?

3) According to me if i accelerate the motor by potentiometer and suddenly make the pot readings to zero then the motor running will generate the regenerative current. So How i can monitor that value and use that value feed back to battery?

Thanks. 

  • 0
    TI__Guru** 117130 points

    1. If positive Iq run motor clockwise, negative Iq will run motor anti-clockwise.

    2. Add a braking resistor to waste the energy, or turn on all low side mosfet to use the motor resistance to waste the energy.

    3. The regenerative brake will boost dc_bus voltage, and you can monitor both dc_bus voltage and current.