Motor driving apparatus
First Claim
1. A motor driving apparatus for driving a brushless motor on a basis of a command revolution speed of the brushless motor, said motor driving apparatus comprising:
- an inverter circuit operable to convert an output voltage of a DC power supply into a driving voltage, and to output the driving voltage to the brushless motor; and
a control unit operable to control said inverter circuit so that an actual revolution speed of the brushless motor reaches the command revolution speed,wherein said control unit controls said inverter circuit so as to vary the actual revolution speed of the brushless motor immediately when the actual revolution speed reaches the command revolution speed, in a state where the command revolution speed of the brushless motor is equal to a specific revolution speed that is determined according to a variable frequency of a voltage output from the DC power supply.
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Accused Products
Abstract
A motor driving apparatus includes an inverter circuit for converting an output of a rectifier circuit connected to a single-phase AC power supply into a driving voltage, and outputting the driving voltage to a brushless motor, and an inverter control unit for controlling the amplitude value of the voltage outputted from the inverter to the brushless motor so as to minimize a difference between a command rpm indicated by an external command signal and an actual rpm derived from an estimated phase of the rotor, wherein the command rpm is set to an rpm outside a predetermined range of rpms.
56 Citations
29 Claims
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1. A motor driving apparatus for driving a brushless motor on a basis of a command revolution speed of the brushless motor, said motor driving apparatus comprising:
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an inverter circuit operable to convert an output voltage of a DC power supply into a driving voltage, and to output the driving voltage to the brushless motor; and a control unit operable to control said inverter circuit so that an actual revolution speed of the brushless motor reaches the command revolution speed, wherein said control unit controls said inverter circuit so as to vary the actual revolution speed of the brushless motor immediately when the actual revolution speed reaches the command revolution speed, in a state where the command revolution speed of the brushless motor is equal to a specific revolution speed that is determined according to a variable frequency of a voltage output from the DC power supply. - View Dependent Claims (2, 3, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17)
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4. A motor driving apparatus for driving a brushless motor on a basis of a first command revolution speed of the brushless motor, said motor driving apparatus comprising:
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an inverter circuit operable to convert an output voltage of a DC power supply into a driving voltage, and to output the driving voltage to the brushless motor; a command revolution speed conversion unit operable to convert the first command revolution speed into a second command revolution speed that continuously varies with the first command revolution speed as its center; and a control unit operable to vary a duty ratio of a control signal which is input to said inverter circuit so that an actual revolution speed of the brushless motor reaches the second command revolution speed. - View Dependent Claims (5, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29)
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9. A motor driving apparatus for driving a brushless motor on a basis of a command revolution speed of the brushless motor, said motor driving apparatus comprising:
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a cycloconverter circuit operable to convert an output voltage of a single-phase AC power supply into a driving voltage, and to output the driving voltage to the brushless motor; and a control unit operable to control said cycloconverter circuit so that an actual revolution speed of the brushless motor reaches the command revolution speed, wherein said control unit controls said cycloconverter circuit so as to vary the actual revolution speed of the brushless motor immediately when the actual revolution speed reaches the command revolution speed, in a state where the command revolution speed of the brushless motor is equal to a specific revolution speed that is determined according to a frequency of a voltage output from the single-phase AC power supply.
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21. A motor driving apparatus for driving a brushless motor on a basis of a first command revolution speed of the brushless motor, said motor driving apparatus comprising:
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a cycloconverter circuit operable to convert an output voltage of a single-phase AC power supply into a driving voltage, and to output the driving voltage to the brushless motor; a command revolution speed conversion unit operable to convert the first command revolution speed into a second command revolution speed that continuously varies with the first command revolution speed as its center; and a control unit operable to vary a duty ratio of a control signal which is input to said cycloconverter circuit so that an actual revolution speed of the brushless motor reaches the second command revolution speed.
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Specification