Bridging a motor?
- Thread starter mull982
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winnie
Senior Member
- Location
- Springfield, MA, USA
- Occupation
- Electric motor research
A 'Wheatstone bridge' was an early type of resistance measuring technique/device.
Bridge techniques are still used for accurate measurement of low resistances.
So I _presume_ that 'bridging' a motor is measuring the various winding resistances with an accurate resistance milliohm meter.
This is used to check for proper connection, shorted turns, etc. With an accurate enough resistance measurement you can determine if the correct number of turns were wound on the various coils when the motor was built.
-Jon
Bridge techniques are still used for accurate measurement of low resistances.
So I _presume_ that 'bridging' a motor is measuring the various winding resistances with an accurate resistance milliohm meter.
This is used to check for proper connection, shorted turns, etc. With an accurate enough resistance measurement you can determine if the correct number of turns were wound on the various coils when the motor was built.
-Jon
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
I have heard similar language used specifically when discussing Wound Rotor Induction Motors that are going to be retrofitted with VFDs. To do that, you need to short the rotor windings. Some people do that externally via the connections to the slip rings, but that is not the best practice. The recommended method is to bridge the rotor winding connections where they attach to the slip rings. But again, that would be in a specific context to WRIMs.
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