Induction machine asymmetry detection instrument and method
First Claim
1. An induction machine asymmetry detection instrument, comprising:
- an interconnector configured to connect an electric source across a first terminal and a second terminal of a stator of an induction machine, the induction machine including a rotor disposed for magnetic coupling with the stator, the interconnector further configured to cause a flow of direct current between the first terminal and the second terminal during a rotation of the rotor when the induction machine is unloaded and rotating freely;
a voltmeter connectable across the second terminal and a third terminal of the stator for measuring voltage across the second terminal and the third terminal concurrent with the flow of direct current and the rotation of the rotor; and
a control interface for determining the presence of an asymmetry of a portion of the induction machine using the measured voltage.
1 Assignment
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Accused Products
Abstract
An induction machine asymmetry detection instrument includes an interconnector and a voltmeter. The interconnector is configured to connect an electric source across a first terminal and a second terminal of a stator of an induction machine. The induction machine includes a rotor disposed for magnetic coupling with the stator. The interconnector is further configured to cause a flow of direct current between the first terminal and the second terminal of the stator during a rotation of the rotor when the induction machine is substantially unloaded. The voltmeter is connectable across the second terminal and a third terminal of the stator. A detection by the voltmeter of a meaningful voltage across the second terminal and the third terminal of the stator concurrent with the flow of direct current between the first terminal and the second terminal and concurrent with the rotation of the rotor serves to indicate an asymmetry of a portion of the induction machine.
12 Citations
20 Claims
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1. An induction machine asymmetry detection instrument, comprising:
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an interconnector configured to connect an electric source across a first terminal and a second terminal of a stator of an induction machine, the induction machine including a rotor disposed for magnetic coupling with the stator, the interconnector further configured to cause a flow of direct current between the first terminal and the second terminal during a rotation of the rotor when the induction machine is unloaded and rotating freely;
a voltmeter connectable across the second terminal and a third terminal of the stator for measuring voltage across the second terminal and the third terminal concurrent with the flow of direct current and the rotation of the rotor; and
a control interface for determining the presence of an asymmetry of a portion of the induction machine using the measured voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An induction machine asymmetry detection method, comprising:
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using an electric source to provide a flow of direct current between a first terminal and a second terminal of a stator of an induction machine during a rotation of a rotor of the induction machine when the induction machine is unloaded and rotating freely;
measuring a voltage across the second terminal and a third terminal of the stator concurrent with the flow of direct current and the rotation of the rotor; and
determining the presence of an asymmetry of a portion of the induction machine using the measured voltage. - View Dependent Claims (13, 14, 15, 16, 17)
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18. An induction machine asymmetry detection instrument, comprising:
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an interconnector configured to connect an electric source across a first terminal and a second terminal of a stator of an induction machine, the induction machine including a rotor disposed for magnetic coupling with the stator, the interconnector further configured to cause a flow of direct current between the first terminal and the second terminal during a rotation of the rotor when the induction machine is unloaded and rotating freely; and
a voltmeter connectable across the second terminal and a third terminal of the stator, wherein a detection by the voltmeter of a voltage greater than background interference across the second terminal and the third terminal concurrent with the flow of direct current and the rotation of the rotor serves to indicate an asymmetry of a portion of the induction machine. - View Dependent Claims (19, 20)
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Specification