CONTROL DEVICE FOR ELECTRIC ROTATING MACHINE AND METHOD OF CONTROLLING THE MACHINE
First Claim
1. A control device which controls a controlled variable of an electric rotating machine by controlling a power inverter circuit applying a controlled voltage to the electric rotating machine, comprising:
- a pattern preparing unit that prepares a pattern having a level changed with time for each of values of a modulation factor;
a determining unit that determines phase information of the controlled voltage and an instructed value of the modulation factor;
a selecting unit that selects the pattern, corresponding to the instructed value of the modulation factor, from the patterns of the pattern preparing unit; and
a pattern control unit that controls the controlled variable of the electric rotating machine by controlling the power inverter circuit such that the controlled voltage of the power inverter circuit is changed with time according to the selected pattern while adjusting a phase of the control led voltage according to the phase information,wherein the pattern preparing unit prepares a triangular wave having a cycle duration, which is equal to a value obtained by dividing an electrical angle cycle duration of the electric rotating machine by an integral number, and prepares each pattern as a triangular wave quasi-comparison pattern so as to have both a first period of a first level, depending on the corresponding value of the modulation factor and including a timing synchronized with a crest point or a trough point of the triangular wave, and a second period of a second level, depending on the corresponding value of the modulation factor and including a timing synchronized with the other point of the triangular wave, andwherein the pattern control unit controls the power inverter circuit to apply a low level of the controlled voltage to the electric rotating machine in response to the first period of the selected triangular wave quasi-comparison pattern and to apply a high level of the controlled voltage to the electric rotating machine in response to the second period of the selected triangular wave quasi-comparison pattern.
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Accused Products
Abstract
A control device has a unit for preparing a pattern having first and second periods by comparing a triangular wave and a sine wave having an amplitude ratio set at each value of a modulation factor, and selecting one pattern corresponding to an instructed modulation factor, and a unit for applying a controlled voltage, set at low and high levels in response to first and second periods of the selected pattern, to a generator. The triangular wave has a cycle duration obtained by dividing the cycle duration of the generator by product of 3 and odd number, a crest having a level higher than the sine wave at a timing of each first period, and a trough having a level lower than the sine wave at a timing of each second period.
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Citations
24 Claims
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1. A control device which controls a controlled variable of an electric rotating machine by controlling a power inverter circuit applying a controlled voltage to the electric rotating machine, comprising:
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a pattern preparing unit that prepares a pattern having a level changed with time for each of values of a modulation factor; a determining unit that determines phase information of the controlled voltage and an instructed value of the modulation factor; a selecting unit that selects the pattern, corresponding to the instructed value of the modulation factor, from the patterns of the pattern preparing unit; and a pattern control unit that controls the controlled variable of the electric rotating machine by controlling the power inverter circuit such that the controlled voltage of the power inverter circuit is changed with time according to the selected pattern while adjusting a phase of the control led voltage according to the phase information, wherein the pattern preparing unit prepares a triangular wave having a cycle duration, which is equal to a value obtained by dividing an electrical angle cycle duration of the electric rotating machine by an integral number, and prepares each pattern as a triangular wave quasi-comparison pattern so as to have both a first period of a first level, depending on the corresponding value of the modulation factor and including a timing synchronized with a crest point or a trough point of the triangular wave, and a second period of a second level, depending on the corresponding value of the modulation factor and including a timing synchronized with the other point of the triangular wave, and wherein the pattern control unit controls the power inverter circuit to apply a low level of the controlled voltage to the electric rotating machine in response to the first period of the selected triangular wave quasi-comparison pattern and to apply a high level of the controlled voltage to the electric rotating machine in response to the second period of the selected triangular wave quasi-comparison pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of controlling a controlled variable of an electric rotating machine by controlling a power inverter circuit applying a controlled voltage to the electric rotating machine, comprising the steps of:
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preparing a pattern having a level changed with time for each of values of a modulation factor; determining phase information of the controlled voltage and an instructed value of the modulation factor; selecting the pattern, corresponding to the instructed value of the modulation factor, from the patterns; and controlling the controlled variable of the electric rotating machine by controlling the power inverter circuit such that the controlled voltage of the power inverter circuit is changed with time according to the selected pattern while adjusting a phase of the controlled voltage according to the phase information, wherein the preparing step includes; preparing a triangular wave having a cycle duration, which is equal to a value obtained by dividing an electrical angle cycle duration of the electric rotating machine by an integral number, and preparing each pattern as a triangular wave quasi-comparison pattern so as to have both a first period of a first level, depending on the corresponding value of the modulation factor and including a timing synchronized with a crest point or a trough point of the triangular wave, and a second period of a second level, depending on the corresponding value of the modulation factor and including a timing synchronized with the other point of the triangular wave, and wherein the controlling step includes; controlling the power inverter circuit to apply a low level of the controlled voltage to the electric rotating machine in response to the first period of the selected triangular wave quasi-comparison pattern and to apply a high level of the controlled voltage to the electric rotating machine in response to the second period of the selected triangular wave quasi-comparison pattern. - View Dependent Claims (22, 23, 24)
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Specification