Control apparatus for inverter for driving AC motor
First Claim
1. A control apparatus for controlling a PWM inverter, said PWM inverter receiving AC power and generating an AC output having a controlled frequency to be supplied to an AC motor, said control apparatus comprising:
- first means for generating, on the basis of a given running command, a PWM signal controlling said inverter with a given sampling period; and
second means for controlling said first means, whereby said AC motor generates an electromagnetic tone preselected so as to correspond to desired information when said AC motor is driven by output of said inverter controlled by said PWM signal.
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Accused Products
Abstract
A control apparatus for controlling a PWM inverter, the PWM inverter receiving AC power and generating an AC output having a controlled frequency to be supplied to an AC motor, comprises a circuit for generating, on the basis of a given running command, a PWM signal controlling the inverter with a given sampling period, and a circuit for controlling the PWM signal generating circuit, whereby the AC motor generates an electromagnetic tone preselected so as to correspond to desired information when the AC motor is driven by output of the inverter controlled by the PWM signal. The above described desired information may be information representing the running state of the motor or selected music.
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Citations
22 Claims
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1. A control apparatus for controlling a PWM inverter, said PWM inverter receiving AC power and generating an AC output having a controlled frequency to be supplied to an AC motor, said control apparatus comprising:
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first means for generating, on the basis of a given running command, a PWM signal controlling said inverter with a given sampling period; and second means for controlling said first means, whereby said AC motor generates an electromagnetic tone preselected so as to correspond to desired information when said AC motor is driven by output of said inverter controlled by said PWM signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A control apparatus for controlling a PWM inverter, said PWM inverter receiving AC power and generating an AC output having a controlled frequency to be supplied to an AC motor, said control apparatus comprising:
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first means for generating, on the basis of a given running command, a PWM signal controlling said inverter with a given sampling period; and second means for controlling said first means, whereby said AC motor generates an electromagnetic tone having rhythm so predetermined as to represent the running state of said motor or load connected to said motor when said AC motor is driven by output of said inverter controlled by said PWM signal. - View Dependent Claims (15, 16)
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17. A control apparatus for controlling a PWM inverter, said PWM inverter receiving AC power and generating an AC output having a controlled frequency to be supplied to an AC motor, said PWM inverter comprising a plurality of PWM inverter units, said control apparatus comprising:
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first means provided for each of said inverter units, said first means generating, on the basis of a given running command, a PWM signal for controlling said associated inverter unit with a given sampling period; and second means for controlling the value of the sampling period and its duration so as to change said sampling period in said first means of each of said inverter units in accordance with a predetermined pattern, whereby said AC motor generates an electromagnetic tone preselected to correspond to desired information when said AC motor is driven by a compound of outputs of said plurality of PWM inverter units controlled by said PWM signals, which are generated by said respective first means. - View Dependent Claims (18, 19, 20, 21)
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22. A motor drive system comprising:
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a PWM inverter receiving AC power and generating an AC output having a controlled frequency to be supplied to an AC motor connected to a load; first means for generating, on the basis of a given running command, a PWM signal controlling said inverter with a given sampling period; and second means for controlling said first means, whereby the electromagnetic tone generated by said AC motor is selectively changed when said AC motor is driven by the output of said inverter.
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Specification