초록 ▼

An on-vehicle rotary electric apparatus, such as an on-vehicle generator, is provided. The apparatus comprises a stator having multi-phase windings, a rotor driven to rotate by either an on-vehicle motor or the running drive shaft of a vehicle, and a driving member for driving the field winding. The

An on-vehicle rotary electric apparatus, such as an on-vehicle generator, is provided. The apparatus comprises a stator having multi-phase windings, a rotor driven to rotate by either an on-vehicle motor or the running drive shaft of a vehicle, and a driving member for driving the field winding. The rotor has a field winding producing a magnetic field. The driving member drives the field winding by supplying the exciting current thereto and changing the exciting current so that the magnetic field rotates differently in a rotation speed from the rotor. Specifically, the driving member comprises a short-circuit winding wound around part of magnetic poles of the rotor and a current-supply unit for supplying, as the exciting current, a single-phase alternating current to the field winding. The short-circuit winding produces a magnetic field delayed in phase by 90 degrees compared to the magnetic field produced by the rotor.

대표청구항 ▼

1. An on-vehicle rotary electric apparatus, comprising;a stator configured to be equipped with multi-phase windings;a rotor configured to have magnetic poles and to be equipped with two partial field windings for producing a magnetic field in response to supply of an exciting current to the field wi

1. An on-vehicle rotary electric apparatus, comprising;a stator configured to be equipped with multi-phase windings;a rotor configured to have magnetic poles and to be equipped with two partial field windings for producing a magnetic field in response to supply of an exciting current to the field windings, the rotor being driven to rotate by an on-vehicle driving source, a single-phase alternating current being supplied through each of the two partial field windings in a one-way direction, the one-way direction assigned to each of the partial field windings being different one from the other;short-circuit windings wound around part of the magnetic poles of the rotor so that the short-circuit windings produce a further magnetic field delayed in phase by substantially 90 degrees compared to the magnetic field produced by the field windings; anda current-supply unit for supplying the single-phase alternating current to the field windings,wherein the current-supply unit includes two switching elements each connected to the two partial field windings and a field controller controlling on/off operations of the two switching elements so that the single-phase alternating current alternately passes through each partial winding in each of the two one-way directions. 2. An on-vehicle rotary electric apparatus, comprising;a stator configured to be equipped with multi-phase windings;a rotor configured to have magnetic poles and to be equipped with a field winding for producing a magnetic field in response to supply of an exciting current to the field winding, the rotor being driven to rotate by an on-vehicle driving source;short-circuit windings wound around part of the magnetic poles of the rotor so that the short-circuit windings produce a further magnetic field delayed in phase by substantially 90 degrees compared to the magnetic field produced by the field winding;a capacitor connected in parallel to the field winding to form a parallel circuit consisting of the field winding and the capacitor to provide a resonant frequency; anda current-supply unit for supplying, as the exciting current, a single-phase alternating current to the field winding,wherein the current-supply unit is equipped with a single switching element connected to the parallel circuit and a field controller controlling on/off operations of the switching element so that the single-phase alternating current passes through the field winding in synchronism with the resonant frequency.