16-08-2012 дата публикации
Номер: US20120206079A1
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. 1. An electromechanical apparatus comprising:magnetic coils of N phases (N is an integer of 3 or more);magnets; anda 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, andthe 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.2. The electromechanical apparatus according to claim 1 , further comprising a regenerator to execute regeneration by using the magnetic coil of a phase that is not driven.3. The electromechanical apparatus according to claim 1 , further comprising a control unit that controls voltage to be applied to the magnetic coil claim 1 , whereinthe 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. This is a divisional application of U.S. application Ser. No. 12/701,807, filed on Feb. 8, 2010, which claims priority to Japanese Patent Application Nos. 2009-052069, filed Mar. 5, 2009 and 2010-012863, filed Jan. 25, 2010, both of which are expressly incorporated by reference herein in their entireties.1. ...
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