Monitoring device for an electric machine, control device and method
First Claim
1. A monitoring device for detecting a blocking of a rotor of an electric machine comprising:
- a first detection apparatus which is configured to detect electrical power supplied to the electric machine,a second detection apparatus which is configured to calculate a theoretical mechanical power output by the electric machine on the basis of a predetermined commutation of the electric machine, wherein the theoretical mechanical power output denotes mechanical power which results from a theoretical calculation of a speed which is predetermined by commutation of the electric machine,a calculation apparatus which, on the basis of the detected electrical power and of the calculated theoretical mechanical power output, is configured to calculate an efficiency of the electric machine and to detect a blocking of the electric machine if values for the detected electrical power and the calculated theoretical mechanical power output differ from each other.
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Accused Products
Abstract
The present invention discloses a monitoring device for an electric machine, comprising a first detection apparatus which is configured to detect electrical power supplied to the electric machine, comprising a second detection apparatus which is configured to detect theoretical mechanical power output by the electric machine on the basis of a commutation of the electric machine, and comprising a calculation apparatus which, on the basis of the detected electrical power and of the detected theoretical mechanical power, is configured to calculate an efficiency of the electric machine and to emit an error signal if the calculated efficiency is greater than 1. The present invention further discloses a control device for an electric machine and a method for monitoring an electric machine.
14 Citations
18 Claims
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1. A monitoring device for detecting a blocking of a rotor of an electric machine comprising:
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a first detection apparatus which is configured to detect electrical power supplied to the electric machine, a second detection apparatus which is configured to calculate a theoretical mechanical power output by the electric machine on the basis of a predetermined commutation of the electric machine, wherein the theoretical mechanical power output denotes mechanical power which results from a theoretical calculation of a speed which is predetermined by commutation of the electric machine, a calculation apparatus which, on the basis of the detected electrical power and of the calculated theoretical mechanical power output, is configured to calculate an efficiency of the electric machine and to detect a blocking of the electric machine if values for the detected electrical power and the calculated theoretical mechanical power output differ from each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for detecting a blocking of a rotor of an electric machine, comprising:
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detecting electrical power which is supplied to the electric machine; calculating a theoretical mechanical power output by the electric machine on the basis of a predetermined commutation of the electric machine, wherein the theoretical mechanical power output denotes mechanical power which results from a theoretical calculation of a speed which is predetermined by commutation of the electric machine; calculating an efficiency of the electric machine on the basis of the detected electrical power and the calculated theoretical mechanical power output; and detecting a blocking of the electric machine if values for the detected electrical power and the calculated theoretical mechanical power output differ from each other. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification