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General Mach Discussion / Re: Replacing a Resolver of an AC Servo with an Encoder
« on: August 27, 2009, 02:55:54 PM »
I have done that on a couple of motors and it was easy enough but another motor I had the resolver seemed to be fixed to the motors shaft and no way it was coming off.
The encoder sounds about right and is cheaper than the quote I got from Renco by about $100
What I ended up doing was buying a small motor with the same amount of poles and using the encoder from it, had to machine special mount plate and an extension shaft as the motors shaft was 1/2inch and the encoder was 12mm
The drives I use have auto sensing for the commutation but its not the best as on power up it moves a bit while it senses the commutation, fine for a spindle I suppose but not great for an axis. Then again if the aux power is kept on the drive it will not need to do this every time the main power comes on.
What size motor you after? Could you not get a bigger motor and gear it to get the speed?
Hood
The encoder sounds about right and is cheaper than the quote I got from Renco by about $100
What I ended up doing was buying a small motor with the same amount of poles and using the encoder from it, had to machine special mount plate and an extension shaft as the motors shaft was 1/2inch and the encoder was 12mm
The drives I use have auto sensing for the commutation but its not the best as on power up it moves a bit while it senses the commutation, fine for a spindle I suppose but not great for an axis. Then again if the aux power is kept on the drive it will not need to do this every time the main power comes on.
What size motor you after? Could you not get a bigger motor and gear it to get the speed?
Hood