Motor drive system and process
First Claim
1. A motor drive system for driving a motor, comprising:
- a multi-output dc power source providing three or more output potentials;
a switching circuit including switching devices connected, respectively, with the output potentials of the multi-output power source, and arranged to drive the motor with power of the power source; and
a controller configured to determine a command apply voltage representing a desired voltage to be applied to the motor, to determine a plurality of command share voltages corresponding to supply voltages of the multi-output dc power source, from the command apply voltage, and to produce a pulsed voltage by driving the switching devices in accordance with the command share voltages.
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Accused Products
Abstract
A motor drive system includes a multi-output dc power source providing three or more output potentials, and a switching circuit including switching devices connected, respectively, with the output potentials of the multi-output power source. A controller determines a command apply voltage representing a desired voltage to be applied to the motor, and further determines a plurality of command share voltages corresponding to supply voltages of the multi-output dc power source, from the command apply voltage. The controller produces a pulsed voltage by driving the switching devices in accordance with the command share voltages.
12 Citations
36 Claims
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1. A motor drive system for driving a motor, comprising:
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a multi-output dc power source providing three or more output potentials;
a switching circuit including switching devices connected, respectively, with the output potentials of the multi-output power source, and arranged to drive the motor with power of the power source; and
a controller configured to determine a command apply voltage representing a desired voltage to be applied to the motor, to determine a plurality of command share voltages corresponding to supply voltages of the multi-output dc power source, from the command apply voltage, and to produce a pulsed voltage by driving the switching devices in accordance with the command share voltages. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A motor drive process for driving a motor with power of a multi-output dc power source providing three or more output potentials, the motor drive process comprises:
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calculating a command apply voltage representing a desired voltage to be applied to the motor;
calculating a plurality of command share voltages corresponding to at least two of the output potentials of the multi-output dc power source, from the command apply voltage; and
producing a pulsed voltage to drive the motor by connecting one of the output potentials to the motor in accordance with the command share voltages.
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31. A motor drive system comprising:
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an ac motor;
a multi-output dc power source including first, second and source terminals providing three output potentials;
a switching circuit including first, second and third switching devices which are connected, respectively, with the first, second and third source terminals, and which are driven, respectively, by first, second and third PWM pulse signals to connect one of the source terminals with the motor to drive the motor with power of the multi-output dc power source; and
a controller configured to produce the first PWM pulse signal by comparing a first desired modulation factor with a first periodic carrier signal, to produce the second PWM pulse signal by comparing a second desired modulation factor with a second periodic carrier signal, and to control a ratio between an amount of power supplied from the first source terminal and an amount of power supplied from the second source terminal, by varying the first desired modulation factor and the second desired modulation factor. - View Dependent Claims (32, 33, 34, 35)
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36. A motor drive system for driving a motor with power of a multi-output dc power source providing three or more output potentials, the motor drive system comprises:
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switching devices connected, respectively, with the output potentials of the multi-output power source, and arranged to drive the motor with power of the power source;
first calculating means for calculating a command apply voltage representing a desired voltage to be applied to the motor;
second calculating means for calculating a plurality of command share voltages corresponding to supply voltages of the multi-output dc power source, from the command apply voltage; and
means for producing a pulsed voltage to drive the motor by driving the switching devices in accordance with the command share voltages.
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Specification