Bridgeport Pancake Motor 3ph > 1ph

[Vince GedgeParticipant @vincegedge77932]

Hi Guys,

I’m looking for some help regarding getting my new to me Bridgeport running. I thought this would be very easy as i have an inverter however i have read that the original NECO motor (pancake two speed motor) does not allow the use of a inverter. I think this is down to the windings and only being 380/440v rather than 240 don’t understand completely. So what i thought would be an easy conversion and low cost seems to have taken a turn, help please.

Milling Machine Spec & Motors, Main Spindle NECO Pancake, Table Motor, Rear Broaching Motor, Coolant.

At this stage just the spindle Motor would be fine to get working but just explaining machine details.

1. I’ve read that a number of people happily use a Transwave STATIC convertor on their Bridgeport’s and this works okay but can be a bit temperamental. I don’t mind this (and changing setting on Transwave) if in the main this works okay. I know i could use a rotary version but i don’t like the cost, size and the fact that an additional motor is required. This is my preferred option as seems least expensive and potentially will run other motors.

Simple question – Will a Transwave STATIC convertor work? If so What KW rating as perhaps this has a factor on success or not.

2. Motor Change – i’ve also read that changing the motor to a new 3 phase offers the VSD option but does cause issues. Requires an 8mm spacer under the new motor and requires a longer shaft. Before i strip out can someone answer What motor and frame size is used, and what the shaft diameter is ? This would be useful before i strip mine out (thank you!)

3. Rewind Original Motor; to 240/380 therefore allowing VSD to be used. I’m not sure who complicated this is to do, previous costs suggests £300 plus a few years ago so sounds like it could be expensive and I’m not sure how efficient the new motor would be compared to a new IE2 or IE3 motor (although perhaps this is splitting hairs! – its a hobby machine!)

Any Photos or advice welcome and thank you for support !

Note; Option 1 – Is my preferred option as seems least expensive and potentially will run other motors.

VInce

[Vince GedgeParticipant @vincegedge77932]

Single Phase Conversion

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