[features] regenerative break and bicycle target

[evaletolab]

Hi,

I'm just wondering if the TMC603 can manage regenerative break (with PWM?). My main target is electric bicycle and because max RPM is low (~250RPM), I'm wondering if the TMC603 is a good solution?


Best regards,

-- olivier

[TRINAMIC_BD]

Hello,
yes, you can manage regenerative operation. Therefore, different schemes are possible: In block commutation, you can program a PWM, which shorts the motor for a short time (all low sides on) and uses the MOSFET diodes, for recirculation of the voltage to the battery. This will allow electronic braking and feed back energy.
Or, you can actively brake the motor by switching to a negative direction (-90°) with a low PWM. The motor will feed back braking energy.
In both cases, the voltage becomes pumped up and you must ensure not to leave the max. voltage range, by monitoring the voltage and reducing braking energy, in case it cannot be fed back to the battery in time.

[casainho]

Hello,
yes, you can manage regenerative operation. Therefore, different schemes are possible: In block commutation, you can program a PWM, which shorts the motor for a short time (all low sides on) and uses the MOSFET diodes, for recirculation of the voltage to the battery. This will allow electronic braking and feed back energy.
Or, you can actively brake the motor by switching to a negative direction (-90°) with a low PWM. The motor will feed back braking energy.
In both cases, the voltage becomes pumped up and you must ensure not to leave the max. voltage range, by monitoring the voltage and reducing braking energy, in case it cannot be fed back to the battery in time.

Hello.

I am cooperating with evaletolab. I am looking to make this Ebike Smart Controller, maybe this will be a kind of Arduino "controller" in the Ebike world.

I have some questions:
- on electric bicycles (our main target) RPM is low (~250RPM), I'm wondering if the TMC603 is a good solution?
- does TMC603 handle the 48V batteries of 13 series cells (13*4.2V = 54.6V)?

[TRINAMIC_BD]

You must always make sure not to exceed the supply voltage of the IC under normal operating conditions. Excursions to absolut maximum ratings should be only under worst case circumstances for limited short times.