Electricity: motive power systems – Nonmagnetic motor
Patent
1991-11-29
1993-08-03
Budd, Mark O.
Electricity: motive power systems
Nonmagnetic motor
310316, 310323, H01L 4108
Patent
active
052332748
ABSTRACT:
A drive circuit is used in a Langevin type ultrasonic bolt-tightening motor in which a motor drive voltage having a given frequency is applied to a piezo-electric element in a stator section, the resulting longitudinal and torsional vibrations being effective to rotate a motor section. The drive circuit has a longitudinal vibration sensor for detecting the longitudinal vibration in the stator section, a torsional vibration sensor for detecting vibration in the stator section and a frequency controller for controlling the frequency of the motor drive voltage such that the phase difference between the detection signals of the longitudinal and torsional vibration sensors becomes 90 degrees so as to provide maximum efficiency. Thus, the frequency of the motor drive voltage can be feedback controlled to maintain an optimum drive frequency despite the varying of the optimum drive frequency due to changes in various factors.
REFERENCES:
patent: 4697117 (1987-09-01), Mishiro
patent: 4709182 (1987-11-01), Wenske et al.
patent: 4764702 (1988-08-01), Mishiro
patent: 5124611 (1992-06-01), Tamai et al.
Honda Keisuke
Honda Yasuyoshi
Komoda Masahiko
Kouzaka Hideo
Miyamoto Toshiaki
Asmo Co. Ltd.
Budd Mark O.
Honda Electronics Co., Ltd.
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