Electrical arrangement for driving a rotary tool fitted in a han

Details Electrical arrangement for driving a rotary tool fitted in a han Electrical arrangement for driving a rotary tool fitted in a han

1987-07-22

1988-07-26

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

H02P 602

Patent

active

047603178

ABSTRACT:
The arrangement comprises an external supply unit that feeds into two flexible conductors (5, 5') a variable d.c. voltage (V.sub.A) superposed on a modulated high frequency voltage (V.sub.C), the modulation being dependent on the position of a switch. The arrangement further comprises, inside a handpiece, means (20, 21) connected to the conductors for receiving therefrom and separating the two voltages, means (23, 25, 26, 27, 28, 29) for feeding a supply voltage (V.sub.D) to the circuits of the handpiece, means (30, 31, 33, 34) for demodulating the high frequency voltage and for generating a logic signal (S.sub.L) representative of the position of the switch, a three-phase motor, sensors (A, A', A") controlled by the motor, an inverting circuit (41) receiving the logic signal, a control circuit (50), and a drive circuit (60) issuing a three-phase signal (S.sub.M, S'.sub.M, S".sub.M) to the terminals (X, X', X") of the motor.
The speed of the motor is determined by the d.c. voltage being applied and the direction of rotation is determined by the position of the switch.

REFERENCES:
patent: 3930186 (1975-12-01), Sekiya et al.
patent: 4004202 (1977-01-01), Davis
patent: 4338556 (1982-07-01), Hetzel
patent: 4341982 (1982-07-01), Lahti et al.
patent: 4617499 (1986-10-01), Yuasa

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