Optimum Lathe with 7i76 and 8i20
02 Jun 2015 18:40 #59342
by PCW
Replied by PCW on topic Optimum Lathe with 7i76 and 8i20
Its fairly tricky to get a random BLDC motor running correctly especially
if you dont have experience with how all the wrong setups act...
Basically 4 things must be right before you can run the motor properly:
1. Commutation direction
2. Commutation scaling
3. Rotor alignment
4. Feedback direction
This means that you need a methodical process for getting all these
items correct or there is little chance of success.
You _can_ use 5v signals for 7I76 Field I/O, but it means all I/O becomes 5V
which is usually not desired
What you do is separate VIN from VFIELD (by moving 7I76 Jumper W1 right)
Then power the 7I76's VIN with 8 to 32VDC and VFIELD with 5V
if you dont have experience with how all the wrong setups act...
Basically 4 things must be right before you can run the motor properly:
1. Commutation direction
2. Commutation scaling
3. Rotor alignment
4. Feedback direction
This means that you need a methodical process for getting all these
items correct or there is little chance of success.
You _can_ use 5v signals for 7I76 Field I/O, but it means all I/O becomes 5V
which is usually not desired
What you do is separate VIN from VFIELD (by moving 7I76 Jumper W1 right)
Then power the 7I76's VIN with 8 to 32VDC and VFIELD with 5V
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