MCT8316Z: SENSORED BLDC MOTOR DRIVER

Hi Subodh,

I will need some time to look into this. I will get back to you by next Tuesday at the latest.

Regards,

Joshua

Hello Joshua,

Thank You for the information.

In our operation, we are going to brake every ~ 80 MS  to 100 MS,  for 10 - 20 MS, will that be sufficient low speed  ?

 Do you have any data on torque calculation based on low side spec.? We want to run motor rated for 0.0039 Nm torque. 

Thanks

Subodh

Hi Subodh,

I believe there was a misunderstanding, to avoid OCP you must first slow down the motor with a lower duty cycle and then once the motor has slowed down, begin braking.

To determine the motor speed at which you can begin braking, you can brake while measuring the phase current and lower the motor speed at which you begin braking until the current spikes are below the OCP threshold.

Regards,

Joshua

Hello Joshua,

Sorry for misunderstanding.  

In our application , motor rotates in reverse direction by external force, the speed of motors in revers direction, starts at  ~16 RPM and over the time increases  up to to ~60 rpm & stops.

We would not have any control over the speed, all we have is to maintain  positive torque  which inversely proportional to speed. In my understating  positive torque can control through PWM duty cycle. Is that correct ?

I hope you understood what i am trying to achieve with MCT8316

Thanks

Looks like  UC3625 is best option for my application. 

Is DRV 8306 able to operate in 4 quadrant  ?

Hi Subodh,

I understand what you are trying to achieve with the MCT8316 better now. I'll look into if the DRV8306 can operate in 4 quadrant. Please allow me some time to look into this, I will reach out to you by next Tuesday at the latest.

Regards,

Joshua  

Hi Joshua,  Thanks you for looking into that. I appreciate.