Rotation state detecting apparatus of a synchronous machine
First Claim
1. A rotation state detecting apparatus for a synchronous machine, comprising:
- calculation means for outputting a voltage vector command and a trigger signal and for outputting a rotation state of a synchronous machine having at least three phase windings, in an idle state;
circuit means for applying voltages to respective phases of the synchronous machine based on the voltage vector command; and
detection means for detecting a current of the synchronous machine based on the trigger signal and for outputting a value indicating the current detected to the calculation means, wherein the calculation means;
outputs a voltage vector for short-circuiting the respective phases of the synchronous machine, short-circuits the respective phases of the synchronous machine, outputs a plurality of trigger signals on at least one occurrence of all-phase short-circuiting to obtain values indicating currents detected by the detection means a plurality of times, and calculates the rotation state of the synchronous machine and sign of rotation speed of the synchronous machine, based on currents detected at least twice on one occurrence of the all-phase short-circuiting, so that when a salient pole ratio of winding inductance of the synchronous machine is larger than two, the sign is different from when the salient pole ratio is smaller than two.
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Abstract
In a conventional rotation state detecting apparatus of a synchronous machine, since short-circuiting must be carried out twice or more when a rotation speed is detected, there have been problems in that it takes a time to detect a rotation state, and it takes a time to start up. A rotation state detecting apparatus for a synchronous machine according to the present invention has been made to solve the above problem, and includes a calculation unit for outputting a voltage vector command and a trigger signal and for outputting a rotation state of a synchronous machine having at least three windings in an idle state, a circuit unit for applying voltages to the respective phases of the synchronous machine on the basis of the voltage vector command, and a detection unit for detecting a current of the synchronous machine on the basis of the trigger signal and outputting a value of the detected current to the calculation unit. The calculation unit outputs a voltage vector for short-circuiting the respective phases of the synchronous machine, outputs trigger signals on at least one occurrence of the short-circuiting to produce current values from the detection unit multiple times, and calculates a rotation speed and a rotation position of the synchronous machine.
20 Citations
5 Claims
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1. A rotation state detecting apparatus for a synchronous machine, comprising:
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calculation means for outputting a voltage vector command and a trigger signal and for outputting a rotation state of a synchronous machine having at least three phase windings, in an idle state;
circuit means for applying voltages to respective phases of the synchronous machine based on the voltage vector command; and
detection means for detecting a current of the synchronous machine based on the trigger signal and for outputting a value indicating the current detected to the calculation means, wherein the calculation means;
outputs a voltage vector for short-circuiting the respective phases of the synchronous machine, short-circuits the respective phases of the synchronous machine, outputs a plurality of trigger signals on at least one occurrence of all-phase short-circuiting to obtain values indicating currents detected by the detection means a plurality of times, and calculates the rotation state of the synchronous machine and sign of rotation speed of the synchronous machine, based on currents detected at least twice on one occurrence of the all-phase short-circuiting, so that when a salient pole ratio of winding inductance of the synchronous machine is larger than two, the sign is different from when the salient pole ratio is smaller than two. - View Dependent Claims (2, 3, 4, 5)
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Specification