Hi,
This is a new thread for my problem regarding Eddy Current Drives and VFD's.
I have to replace the eddy current clutch drive with a vfd. I have a strong feeling that I also need to replace the Eddy current motor but my boss said we can still use said motor. Any thoughts? BTW, the motor is 45 kW and they already bought the VFD which is also rated at 45 kW.
Reply by jrwb4gbm - Years ago (40+) when the center bearing locked up (failed to turn) the output shaft would run at 100% of motor RPM. To use your existing motor I would suggest replacement as the 1st option, supply the eddy current clutch with 100% excitation voltage as the 2nd option, and weld or otherwise lock up the center bearing as the 3rd option.
Reply by Tom Jenkins - In most cases the motor used with an eddy current clutch was standard. Check the motor nameplate. Most of the time you can use an existing motor with a VFD as long as it has Class F insulation or better and has a 1.15 service factor.
We are going for option 1 which is to modify the motor. We are going to remove the eddy current clutch and replace the shaft of the induction motor with a longer one so it can connect to the load gear. The machine we are operating is a Press machine. And I understand that by controlling the speed of the Induction motor, the required torque will be affected. The motor will now also be strained because it is connected directly to the load. My question is, is it plausible for a direct connection from AC motor to the load and still have the same results as when it an Eddy current motor was used? Is the rating of the motor enough?
This is a new thread for my problem regarding Eddy Current Drives and VFD's.
I have to replace the eddy current clutch drive with a vfd. I have a strong feeling that I also need to replace the Eddy current motor but my boss said we can still use said motor. Any thoughts? BTW, the motor is 45 kW and they already bought the VFD which is also rated at 45 kW.
Reply by jrwb4gbm - Years ago (40+) when the center bearing locked up (failed to turn) the output shaft would run at 100% of motor RPM. To use your existing motor I would suggest replacement as the 1st option, supply the eddy current clutch with 100% excitation voltage as the 2nd option, and weld or otherwise lock up the center bearing as the 3rd option.
Reply by Tom Jenkins - In most cases the motor used with an eddy current clutch was standard. Check the motor nameplate. Most of the time you can use an existing motor with a VFD as long as it has Class F insulation or better and has a 1.15 service factor.
We are going for option 1 which is to modify the motor. We are going to remove the eddy current clutch and replace the shaft of the induction motor with a longer one so it can connect to the load gear. The machine we are operating is a Press machine. And I understand that by controlling the speed of the Induction motor, the required torque will be affected. The motor will now also be strained because it is connected directly to the load. My question is, is it plausible for a direct connection from AC motor to the load and still have the same results as when it an Eddy current motor was used? Is the rating of the motor enough?