Patent ID: 11870312
Assignee: DENSO CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A field coil type rotating electric machine comprising:
a stator including a stator coil that is comprised of a plurality of phase windings;
a field coil including a serially-connected winding pair consisting of a first winding and a second winding that are connected in series with each other; and
a rotor including a rotor core and a plurality of main poles formed at predetermined intervals in a circumferential direction and each radially protruding from the rotor core,
wherein
each of the first and second windings of the field coil is wound on all of the main poles of the rotor,
each of the phase windings of the stator coil is configured to be supplied with harmonic current to induce field current in the field coil,
the rotating electric machine further comprises a diode and a capacitor,
the diode has its cathode connected to a first-winding-side end of the serially-connected winding pair and its anode connected to a second-winding-side end of the serially-connected winding pair,
the capacitor is connected in parallel with the second winding,
in the rotating electric machine, there are formed both a series resonant circuit including the first winding and the capacitor and a parallel resonant circuit including the second winding and the capacitor,
the first winding is radially located closer to the stator than the second winding is,
N1<N2, where N1 is the number of turns of the first winding and N2 is the number of turns of the second winding, and
inductances of the first and second windings are set to satisfy: 120°<θs<240°, where θs is a phase offset between electric current flowing in the series resonant circuit and electric current flowing in the parallel resonant circuit.