wiring up slip ring motors
wiring up slip ring motors
(OP)
Please advise on the various ways to wire up a 3 phase 6 wire slip ring motor. It is 15 HP 380/415V. The rotor and stator terminals are marked separately. Many thanks
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
wiring up slip ring motors
|
RE: wiring up slip ring motors
To start the machine, you would normally apply full voltage to the stator windings (Using a contactor and overload) with some resistance connected in the rotor circuit. The initial start torque is controlled by the selection of the rotor resistance. As the motor accelerates to full speed, the rotor resistance can be reduced and at full speed, the rotor circuit can be shorted out. Retaining resistors in the rotor circuit during run will reduce the efficiency of the system and also cause the motor to run a little slower.
If you try to start the motor with the rings shorted, there will be a very large start current for a very low torque. In most situations, this would be unacceptable.
The rotor resistance must have a high power rating as it carries a high value of current for the duration of the start.
Mark Empson
http://www.lmphotonics.com
RE: wiring up slip ring motors
RE: wiring up slip ring motors
Best regards,
Mark.
Mark Empson
http://www.lmphotonics.com