Motor Commutation Sequence

[venkat9chinthapalli]

Hello .....

I have a query regarding commutation of 3-Phase BLDC Motor.

In my design i have a 2pole 3Phase BLDC Motor and H-Birdge for the commutation of motor and the sequence is as follows

Sequence 1 Switching ON - HS_V and LS_W Mosfets
Sequence 2 Switching ON - HS_U and LS_W Mosfets
Sequence 3 Switching ON - HS_U and LS_W Mosfets
Sequence 4 Switching ON - LS_V and HS_W Mosfets
Sequence 5 Switching ON - LS_U and HS_W Mosfets
Sequence 6 Switching ON - LS_U and HS_V Mosfets

Each sequence is used to rotate motor by 60Deg.

So my question is if i need to goto 85Deg how the sequence would be

 

[mrflibble]

PWM the low side mosfets for example...

 

[venkat9chinthapalli]

Thanks for your reply.

How to calculate the no. of PWM pulses in each step i.e, 0 to 60Deg

 

[mrflibble]

google: pwm motor commutation

That should get you started...