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Author Topic: Sanyo Denki Spindle Motor/ Drive  (Read 7063 times)

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Offline Hood

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Re: Sanyo Denki Spindle Motor/ Drive
« Reply #10 on: June 24, 2016, 04:36:46 PM »
Probably not, spindle motors on CNC machines are often not servos but just high spec motors run from a VFD.
Hood
Re: Sanyo Denki Spindle Motor/ Drive
« Reply #11 on: June 24, 2016, 05:57:07 PM »
So if I want to go vfd route I'd need to get for example a fanuc ac spindle motor and run that off a vfd drive ?

Offline Hood

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Re: Sanyo Denki Spindle Motor/ Drive
« Reply #12 on: June 26, 2016, 04:47:37 AM »
No you would just need a normal 3 phase induction motor, well as long as it was rated for VFD use, most nowadays will be.
You will not get constant torque as you would with a servo and if you slow down too much you will lose a big chunk of it, that is why a normal VFD/Induction motor is not the best route but if that is your only option then......



Hood

Offline mc

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Re: Sanyo Denki Spindle Motor/ Drive
« Reply #13 on: June 26, 2016, 05:58:57 AM »
Brushless servos are basically AC induction motors, with their drives being more advanced VFDs.

Looking at the wiring, I'd say you should be able to drive your existing spindle motor using a VFD.
US, VS, WS will be the main power wires, SFAN will be the cooling fan power (you'd need to work out what voltage it needs), SPOH will most likely be a switch that breaks the circuit when the spindle overheats. The other connector will be the spindle encoder.

I'd be inclined to try a cheap VFD, and see if you can get the spindle to run. Even an undersized VFD should be able to spin up the motor to see if it will run, before spending money on a more suitable VFD.

Offline Hood

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Re: Sanyo Denki Spindle Motor/ Drive
« Reply #14 on: June 26, 2016, 06:17:01 AM »
AC servos are synchronous motors, I think and I think you will have problems keeping it synchronous with no feedback, fine with no load possibly but add varying load and things will be different.
What would happen in that situation I am unsure but likely it would stall like a stepper would but  then I  am just really guessing here as I have no experience and have not  looked into it .

Hood

Offline mc

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Re: Sanyo Denki Spindle Motor/ Drive
« Reply #15 on: June 26, 2016, 06:28:42 AM »
It depends on the motor, but given the wiring is pretty basic, with the encoder details separate, I'd doubt this motor relies on sensors to run.

The best place I can think of asking, would be over on the Spindle/VFD board on CNCzone - http://www.cnczone.com/forums/spindles-vfd/

Offline Hood

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Re: Sanyo Denki Spindle Motor/ Drive
« Reply #16 on: June 26, 2016, 07:35:46 AM »
Let me know what you find mc, would be interested in this as I have quite a few big servos that could be used as spindle motors if a cheap drive could be used.
I suspect however that as they are synchronous motors then the reason they have feedback is so that the drive knows where the rotor is and can drive the windings correctly to keep it in sync.

Hood

Offline mc

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Re: Sanyo Denki Spindle Motor/ Drive
« Reply #17 on: June 26, 2016, 02:11:06 PM »
I've done a bit searching and reading, and you are correct about synchronous motors.
This article from Novak (big remote control motor/driver supplier) explains what the sensoring is used for pretty well - http://teamnovak.com/tech_info/view_article/24
Obviously it's aimed at small high RPM motors.

However a search of inverterdrive.com, and some of the Closed Loop Vector drives can handle synchronous motors. I only checked the first couple pages, but the Teco A510's, Invertec Optidrives P2's, and WEG CFWxx's all specifically mention being suitable for permanent magnet synchronous motors.

Offline Hood

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Re: Sanyo Denki Spindle Motor/ Drive
« Reply #18 on: June 26, 2016, 02:25:58 PM »
Yes but I suspect most of these drives you mention will be getting on for servo drive prices and quite possibly be 3 phase for a 7.5Kw one.
BTW Control Tecnhiques also do drive which are sort of all rounders as well. They have add on modules for all sorts of feedback etc but again you are talking servo kind of prices :(

Hood
Re: Sanyo Denki Spindle Motor/ Drive
« Reply #19 on: June 26, 2016, 05:15:11 PM »
I'm thinking what to do because I'm very limited to space on the head because of the mechanical tool release mechanism.. I'm thinking sourcing a Fanuc model y ac spindle motor and a vfd ? What do you guys think