Electric motor drive arrangement

Details Electric motor drive arrangement Electric motor drive arrangement

1983-03-21

1985-05-28

Witkowski, Stanley J.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, 318341, 318282, H02P 506, H02K 3700

Patent

active

045202966

ABSTRACT:
A drive arrangement for the shaft of a turbo molecular pump comprises a motor supply, including a chopper which controls a voltage source, and a motor with two phase windings connected via a current measuring resistor to the neutral point of the voltage source. The voltage drop at the resistor is proportional to the motor current and so influences the width of the control pulses of a pulse-width modulator connected to control the chopper that the motor current remains constant. Switching transistors for the motor have parallel oppositely-connected diodes which, upon disconnection of a phase winding, supply residual energy to capacitors in the circuit.

REFERENCES:
patent: 3171075 (1965-02-01), Kirk
patent: 3486099 (1969-12-01), Brunner et al.
patent: 3525029 (1970-08-01), Joslyn et al.
patent: 3824440 (1974-07-01), McIntosh
patent: 3911338 (1975-10-01), Igarashi et al.
patent: 4020361 (1977-04-01), Suelzle et al.
patent: 4249116 (1981-02-01), Hieda
patent: 4374347 (1983-02-01), Muller
Control Engineering, vol. 24, No. 3, 3/77, (High Frequency SCR Chopper Circuit Improves DC Servo Motor Response).
Henmann-Stump, "Thyristors", 2nd Edition, 1970, p. 148.
Swiss Journal, "Technische Rundschau", vol. 2, Jan. 15, 1974, pp. 27, 29 and 31.

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