초록 ▼

A two-phase switched reluctance motor comprises a rotor without windings, a stator having windings, and an electronic control circuit for controlling the current in the windings to effect rotation of the rotor. The control circuit includes a capacitance bridge defining a floating point to which one

A two-phase switched reluctance motor comprises a rotor without windings, a stator having windings, and an electronic control circuit for controlling the current in the windings to effect rotation of the rotor. The control circuit includes a capacitance bridge defining a floating point to which one end of each of the windings is coupled to form a resonance circuit. Switching transistors are connected to the windings and are switched in synchronism with rotation of the rotor so as to produce current pulses which are limited by the build-up of voltage at the floating point of the capacitance bridge. This ensures that the current in the windings returns naturally to zero at the end of each excitation pulse, thus providing more efficient power operation and reducing the acoustic noise of the machine.

대표청구항 ▼

1. An electrical machine comprising a rotor (7) without windings, a stator (2) having a winding (11, 30, 48, 49), and circuit means for controlling the current in the winding (11, 30, 48, 49) during rotation of the rotor, characterised in that the circuit means includes a capacitance bridge (35, 36,

1. An electrical machine comprising a rotor (7) without windings, a stator (2) having a winding (11, 30, 48, 49), and circuit means for controlling the current in the winding (11, 30, 48, 49) during rotation of the rotor, characterised in that the circuit means includes a capacitance bridge (35, 36, 39) defining a variable voltage point to which one end of the winding (11, 30, 48, 49) is directly coupled to form a resonance circuit, and switch means (31, 32) coupled to the winding and switchable in synchronism with rotation of the rotor to produce cyclically varying current pulses which are caused to decay naturally by the build-up of voltage at the variable voltage point of the capacitance bridge (35, 36, 39) during each cycle of excitation.