Electricity: motive power systems – Impact – mechanical shock – or vibration-producing motors
Patent
1979-04-27
1980-12-16
Smith, Jr., David
Electricity: motive power systems
Impact, mechanical shock, or vibration-producing motors
318128, 318138, 318118, 73664, 248638, 274 1E, H02K 3300
Patent
active
042401410
ABSTRACT:
The vibration motor comprises a concentrator of torsional vibrations, whose end face is in close contact with a rotor, and a piezoelectric cell unit adjoining the concentrator of torsional vibrations. Besides, the vibration motor is provided with a magnetic field source arranged under the rotor at the side of the concentrator of torsional vibrations and having a power sufficient to hold the rotor firmly against the concentrator end face, and with magnetic circuit. One part of the latter is movable, being fashioned as a disk with circumferentially spaced slots and rigidly connected to the rotor. The other part of the magnetic circuit separated from the first one by an air gap is stationary. It surrounds the magnetic field source and has peripheral slots identical to those of the movable disk and arranged opposite to them. The magnetic field source and the magnetic circuit form a rotor speed pickup connected with the piezoelectric cell unit through a frequency detector, a d-c power supply source and a high-frequency oscillator connected to each other in series.
REFERENCES:
patent: 2964272 (1960-12-01), Olson
patent: 3584274 (1971-06-01), Dimitrios et al.
patent: 3643140 (1972-02-01), Allison
patent: 3786288 (1974-01-01), Joannoy
patent: 3922590 (1975-11-01), Warren et al.
patent: 3988024 (1976-10-01), Watanabe et al.
Dvornin Vladimir S.
Kondratiev Alexandr V.
Kravchenko Vladimir F.
Vasiliev Petr E.
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