Electricity: motive power systems – Reciprocating or oscillating motor – Energizing winding circuit control
Patent
1990-07-03
1992-08-18
Smith, Jr., David
Electricity: motive power systems
Reciprocating or oscillating motor
Energizing winding circuit control
318254, 318380, H02P 602
Patent
active
051402327
ABSTRACT:
A brushless motor drive circuit comprises a stator having m-phase drive coils, a rotor having magnetic poles, a position detecting element for generating m-phase output signals in accordance with the positional relationship between the rotor and the stator, electric current capable of flowing through the m-phase drive coils of the stator in either direction, a plurality of switching devices for switching the current being supplied to the m-phase drive coils in accordance with the output signals from the position detecting element, a current control circuit for controlling the level of the current being supplied to the drive coils utilizing the group of switching devices and a brake circuit for braking the rotor by feeding back the counter electromotive voltage generated when the current being supplied to the drive coils is interrupted so as to suppress the voltage to about half of the power source voltage for the drive circuit. With such an arrangement, since the counter electromotive voltage is suppressed to about half of the power source voltage, a brushless motor drive circuit according to the invention is free from any malfunctions.
REFERENCES:
patent: 3566227 (1971-02-01), Edhlund
patent: 3611092 (1971-10-01), Wilmunder
patent: 4426606 (1984-01-01), Suita et al.
patent: 4494056 (1985-01-01), Nishijima et al.
patent: 4633150 (1986-12-01), Inaji et al.
Gottlieb, Irving M., Electric Motors & Electronic Motor Control Techniques, Howard Sams & Co., Inc., pp. 133-134.
Sankyo Seiki Mfg. Co. Ltd.
Smith Jr. David
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