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  • Bridgeport motor

    I have a Bridgeport with a 1 1/2 hp motor on it I was running it with a static phase converter, the phase converter went bad and the motor stalled, I hooked it up to a VFD and it will not run, has anybody had to replace or get a Bridgeport motor rebuilt? And how much did it cost? Can the motor be converted to single phase?
    Mike
    Brandon MI
    2003 MINI Cooper S JCW#249
    1971 Opel GT
    1985 Ford 3910LP

  • #2
    I've replaced a few. Rebuild will be expensive partially as almost nobody does it any more. Two that say they do locally ship them to Mexico and still charge $500 or so. I have a couple here that will work depending on you head type. Is yours the early Varispeed or a step belt?

    Check out your motor - you can easily see a burnt winding.

    "Conversion" to single phase is not practicable. Of course a VFD does that.

    And too late for your existing motor, but put a motor overload starter on the new one And dump your static phase converter... it doesn't convert phases - just starts the motor and runs it single phase. Some rarer type do add a third phase component but they are typically used on fixed load devices.
    Last edited by lakeside53; 07-21-2017, 01:05 AM.

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    • #3
      Mike, assuming you have already looked for a motor shop in your area, perhaps these guys can help. Jim http://www.machinerypartsdepot.com/?...FYGUfgodwKsHtg

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      • #4
        There is a local electric motor shop that I am taking the motor to on Mon. they charge $20 to test the motor and tell you what is wrong with it, so I will know more then. It is a variable speed unit. I know about H&W I have one of their variable speed rebuild kits and a DVD on how to rebuild a Bridgeport from them.
        Mike
        Brandon MI
        2003 MINI Cooper S JCW#249
        1971 Opel GT
        1985 Ford 3910LP

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        • #5
          Are you sure the motor is connected properly to the VFD and the VFD is working and setup properly? You say the static converter failed and the motor stalled. Seems unlikely both components would fail simultaneously. I'd take the motor to a known good source of 3 phase, make sure it is connected according to the wiring diagram in the Bridgeport manual and see if it runs. Only then would I go down the route of rebuild/replacement. Otherwise I recently had mine apart and replaced the bearings. No big deal. If the rotor is bad they are available for about $350. The outer winding is the super expensive part and hard to find perhaps by now. Here's a few websites to help:

          http://www.machinerypartsdepot.com/s...57/page/912125

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          • #6
            Before you blame the motor (it was working OK before, right?) troubleshot the VFD. Got lights etc. Is there a fault code on the control panel? Have you ensured the VFD's parameters suit the motor's ratings? All connections properly made? Motor connected for your service voltage? Is there an enable terminal mis-wired?

            Not saying the motor aint the problem but check the easy stuff first.
            Last edited by Forrest Addy; 07-20-2017, 12:46 PM.

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            • #7
              Super quick test: put your head next to the motor and SNIFF. Smell like burnt wires?

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              • #8
                I tested the VFD on a 3 phase motor I removed from my variable speed drill press and it ran the motor, the DP motor was 3/4 HP, the VFD is rated for up to 2HP, the mill had a habit of sometimes not wanting to start, I could usually get it going by garbing the spindle and giving it a spin, but that stopped working so I think it went bad, I am going to run a few bench tests on my own before I take it in, Thanks for the help.
                Mike
                Brandon MI
                2003 MINI Cooper S JCW#249
                1971 Opel GT
                1985 Ford 3910LP

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                • #9
                  The motor has a short, needs to be rewound, cost $550, should be done in 7 to 10 days.
                  Mike
                  Brandon MI
                  2003 MINI Cooper S JCW#249
                  1971 Opel GT
                  1985 Ford 3910LP

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                  • #10
                    Looks like an opening for what I do over here

                    Brand new 2HP motor - about £150 in stock
                    Laser cut conversion plate - about £20-in stock.
                    Rework to the new motor to suit the bridgeport - about £100

                    Same day or next day latest
                    .

                    Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



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                    • #11
                      Does the motor have the proper shaft for the variable speed pulley? that was the main thing keeping me from converting to a different motor.
                      Mike
                      Brandon MI
                      2003 MINI Cooper S JCW#249
                      1971 Opel GT
                      1985 Ford 3910LP

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                      • #12
                        No just standard framed metric motor and I mod the shaft to suit whatever is needed.
                        .

                        Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



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