Brushless motor drive circuit having a highly accurate sinusoida

Details Brushless motor drive circuit having a highly accurate sinusoida Brushless motor drive circuit having a highly accurate sinusoida

1990-10-16

1992-10-13

Shoop, Jr., William M.

Electricity: motive power systems

Switched reluctance motor commutation control

318439, H02P 600

Patent

active

051554194

ABSTRACT:
A drive circuit for driving a brushless motor includes a rotor magnet with m (m=integer) different phases for rotatatively driving the rotor magnet. A total of k (k=integer) locating devices, such as Hall elements, are employed for detecting the rotary position of the rotor magnet and for generating output signals representing the detected position. A total of m controlling and multiplying circuits are included, each responsive to the output signal from the corresponding one of the k locating devices at one of its input terminals. The drive circuit includes m output amplifiers, each for receiving the output signal from the corresponding one of the m controlling and multiplying circuits to provide m output voltage to drive the drive coils. M repetitive multipliers are included for repetitively multiplying each of the output voltages by itself until the sum of the powers of the output voltages reaches a given value. The exponent of the repetitive multiplication is an even number. A control section feeds back the output voltages from repetitive multiplication to the other input terminals of each of the controlling and multiplying circuits to provide highly accurate sinusoidal voltages to the motor.

REFERENCES:
patent: 4633150 (1986-12-01), Inaji et al.
patent: 4658190 (1987-04-01), Miyazaki et al.
patent: 4686437 (1987-08-01), Langley et al.
patent: 4700116 (1987-10-01), Inoue et al.
patent: 4748386 (1988-05-01), Nakanishi et al.
patent: 4950968 (1990-08-01), Ogura
patent: 5006768 (1991-04-01), Rozman

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