Method and apparatus for testing dynamoelectric machine rotors
First Claim
1. Test apparatus for testing dynamoelectric machine rotors, comprising:
- a test fixture including means for accepting and rotating a rotor, and exciting means for magnetizing the rotor during rotation;
skew sensing means for sensing an effective electrical skew of the rotor and for generating an effective skew signal responsive thereto; and
signal processing means for determining the effective electrical skew of the rotor in response to the effective skew signal.
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Abstract
A method and apparatus for testing dynamoelectric machine rotors, particularly squirrel cage rotors for induction motors, to obtain resistance, reactance, and effective skew values to permit identification of rotor defects. The rotor is rotated in an alternating magnetic field and pick-up coils are used to sense the voltage generated in the rotor by sensing the magnetic flux generated by magnetization of the rotor during rotation. Current sensing is used to determine the current used in magnetizing the rotor and a separate skew pick-up coil is utilized to detect effective electrical skew. These signals are processed to determine whether the rotor meets predetermined pass/fail criteria, to provide detailed statistical data and to generate a failure indication responsive to one of the values falling outside respective predetermined limits.
17 Citations
16 Claims
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1. Test apparatus for testing dynamoelectric machine rotors, comprising:
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a test fixture including means for accepting and rotating a rotor, and exciting means for magnetizing the rotor during rotation; skew sensing means for sensing an effective electrical skew of the rotor and for generating an effective skew signal responsive thereto; and signal processing means for determining the effective electrical skew of the rotor in response to the effective skew signal. - View Dependent Claims (2, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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3. A method for testing dynamoelectric machine rotors, comprising the steps of:
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rotating a rotor and magnetizing the rotor during rotation; and sensing an effective electrical skew of the rotor and generating an effective skew signal responsive thereto; determining an effective electrical skew value in response to the effective skew signal. - View Dependent Claims (4, 5, 16)
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Specification