Energy converter and electromechanical apparatus
First Claim
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1. An electromechanical apparatus comprising:
- magnetic coils of N phases (N is an integer of 3 or more);
magnets; and
a PWM drive circuit that drives the magnetic coils of N phases, whereinthe magnetic coil of each phase can be independently controlled by the PWM drive circuit,the PWM drive circuit drives all the magnetic coils of N phases at a starting time and, after the starting, selects the number of phases to be driven in accordance with the magnitude of torque required for the electromechanical apparatus,a control unit that controls voltage to be applied to the magnetic coil, wherein the control unit applies voltage to the magnetic coil in an excitation interval that is symmetric about a π
/2 phase point when a position at which the polarity of a waveform of induced voltage induced in the magnetic coil due to the movement of the magnets is reversed is defined as a π
phase point, does not apply voltage to the magnetic coil in a non-excitation interval that is symmetric about the π
phase point of the waveform of the induced voltage, and makes the length of the non-excitation interval greater as the electromechanical apparatus rotates at high revolution.
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Abstract
An energy converter includes magnetic coils of N phases (N is an integer of 3 or more), and a PWM drive circuit for driving the magnetic coils of N phases, wherein the magnetic coil of each phase can be independently controlled by the PWM drive circuit.
16 Citations
2 Claims
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1. An electromechanical apparatus comprising:
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magnetic coils of N phases (N is an integer of 3 or more); magnets; and a PWM drive circuit that drives the magnetic coils of N phases, wherein the magnetic coil of each phase can be independently controlled by the PWM drive circuit, the PWM drive circuit drives all the magnetic coils of N phases at a starting time and, after the starting, selects the number of phases to be driven in accordance with the magnitude of torque required for the electromechanical apparatus, a control unit that controls voltage to be applied to the magnetic coil, wherein the control unit applies voltage to the magnetic coil in an excitation interval that is symmetric about a π
/2 phase point when a position at which the polarity of a waveform of induced voltage induced in the magnetic coil due to the movement of the magnets is reversed is defined as a π
phase point, does not apply voltage to the magnetic coil in a non-excitation interval that is symmetric about the π
phase point of the waveform of the induced voltage, and makes the length of the non-excitation interval greater as the electromechanical apparatus rotates at high revolution. - View Dependent Claims (2)
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Specification
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Current AssigneeGodo Kaisha IP Bridge 1 (IP Bridge, Inc.)
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Original AssigneeSeiko Epson Corporation (Seiko Group)
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InventorsTakeuchi, Kesatoshi, Nakamura, Kazuyoshi
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Primary Examiner(s)Benson, Walter
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Assistant Examiner(s)CARRASQUILLO, JORGE L
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Application NumberUS13/455,597Publication NumberTime in Patent Office209 DaysField of Search318/811, 318/34, 318/280, 318/400.41, 318/400.02, 318/400.04, 318/490, 318/156.35, 318/400.34, 318/282, 318/266, 318/567, 318/802, 318/716, 318/599, 318/725, 318/254.1, 318/286, 318/376, 310/156.35, 310/266, 310/268, 310/156.32, 310/112, 310/113, 310/156.01, 310/156.33, 310/156.36, 310/269, 310/180, 363/37, 369/59.11US Class Current318/400.29CPC Class CodesH02P 25/18 with arrangements for switc...H02P 25/184 wherein the motor speed is ...H02P 27/08 with pulse width modulationH02P 6/085 in a bridge configuration
