Permanent magnet rotor crack detection
First Claim
Patent Images
1. A method for detecting cracks in a permanent magnetic rotor of an electric motor/generator, comprising:
- a) providing an apparatus for sensing a magnetic flux field in motion;
b) using said apparatus to sense a magnetic flux distribution of a magnetic flux field of the permanent magnetic rotor when the magnetic flux field rotates together with the rotor;
c) using the apparatus to monitor the magnetic flux distribution of the magnetic flux field of the permanent magnetic rotor;
d) detecting an anomaly in the magnetic flux distribution using the apparatus, the anomaly associated with a location on the permanent magnetic rotor;
e) identifying a crack location on the permanent magnetic rotor associated with said rotor location.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and apparatus for permanent magnetic (PM) rotor crack detection includes a sensor which monitors magnetic flux distribution of the PM rotor and identifies the presence of a crack in the PM rotor when a magnetic flux distribution change or anomaly is detected.
21 Citations
20 Claims
-
1. A method for detecting cracks in a permanent magnetic rotor of an electric motor/generator, comprising:
-
a) providing an apparatus for sensing a magnetic flux field in motion; b) using said apparatus to sense a magnetic flux distribution of a magnetic flux field of the permanent magnetic rotor when the magnetic flux field rotates together with the rotor; c) using the apparatus to monitor the magnetic flux distribution of the magnetic flux field of the permanent magnetic rotor; d) detecting an anomaly in the magnetic flux distribution using the apparatus, the anomaly associated with a location on the permanent magnetic rotor; e) identifying a crack location on the permanent magnetic rotor associated with said rotor location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A method for detecting cracks in a permanent magnetic rotor of an electric motor/generator, comprising:
-
a) providing an apparatus including a wire loop for sensing a magnetic flux field in motion; b) positioning the wire loop in a selected location adjacent the permanent magnetic rotor, the wire loop being connected to an electric circuit of the apparatus for sensing a magnetic flux distribution of a magnetic flux field of the permanent magnetic rotor when the magnetic flux field rotates together with the rotor; c) monitoring the magnetic flux distribution of the magnetic flux field of the permanent magnetic rotor using the wire loop of the apparatus in said location during a rotor operation; and d) identifying the presence of a crack in the permanent magnetic rotor when an unknown magnetic flux distribution anomaly of the rotor is detected. - View Dependent Claims (18)
-
-
19. An electric machine system comprising:
-
a permanent magnetic rotor rotatably mounted adjacent a stator; means for detecting a crack in the permanent magnetic rotor during rotation, said means using a measured magnetic flux distribution of a magnetic flux field of the permanent magnetic rotor as the magnetic flux field rotates together with the rotor during normal operation of said electric machine system; and a computer system communicating with said means for recording information associated with a detected crack in the permanent magnetic rotor. - View Dependent Claims (20)
-
Specification