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US 9,425,720 B2Granted
Electric motor and motor control
AssigneeNidec Motor Corporation
InventorsGregory A. Peterson, Michael P. Sullivan, Stephen J. Burton, Gary E. Horst, Keith I. Hoemann, Richard J. Fadler
Life of this patent
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Abstract
Various embodiments of an electric motor and electronic control for an electric motor are disclosed. An exemplary electric motor comprises a single-phase brushless permanent magnet electric motor. In exemplary embodiments, the electronic motor control is configured to commutate an electric motor at a frequency other than line frequency, perform pulse width modulation, and drive the electric motor with a drive waveform that approximates the counter-electromotive force of the motor.
Claims19
A motor system comprising:
- an electric motor comprising:
- a stator, a rotor, a permanent magnet, and a winding;
- a single-phase electric power supply circuit configured to receive an alternating current having a first frequency and provide electric power to the electric motor;
- and
- a motor controller comprising a processor and a memory, the motor controller being configured to control the single-phase electric power supply circuit, the processor being configured to execute a motor control software that (a) receives position data indicative of rotor position, and (b) based on the received position data, electronically commutates the electric motor at a second frequency not equal to the first frequency, the memory comprising a lookup table that stores a digital representation of a counter-electromotive force waveform associated with the electric motor, the digital representation comprising a triangle waveform approximation of the counter-electromotive force waveform.
2 more elements
A system comprising:
- a fluid moving component;
- an electric motor for driving the fluid moving component and comprising:
- a stator, a rotor, a permanent magnet, and a winding;
- a single-phase electric power supply circuit configured to receive an alternating current having a first frequency and provide electric power to the electric motor;
- and
- a motor controller comprising a processor and a memory, the motor controller being configured to control the single-phase electric power supply circuit, the processor being configured to execute a motor control software that (a) receives position data indicative of rotor position, and (b) based on the received position data, electronically commutates the electric motor at a second frequency not equal to the first frequency, the memory comprising a lookup table that stores a digital representation of a counter-electromotive force waveform associated with the electric motor, the digital representation comprising a triangle waveform approximation of the counter-electromotive force waveform.
3 more elements
Dependencies are inferred from the claim text.