Title:
ROTARY ELECTRIC MACHINE
Document Type and Number:
WIPO Patent Application WO/2019/017268
Kind Code:
A1
Abstract:
In this rotary electric machine (10), the permeance of a q-axis magnetic circuit is larger than the permeance of a d-axis magnetic circuit. The rotary electric machine is provided with a control unit (55) and switches (53a, 56b) for supplying power to a field winding (43). Duty ratio is defined as the ratio of ON-time to the switching interval of the switches, and a predetermined value is specified, which is greater than the duty ratio corresponding to the field current at which the amount of decrease in the inductance of the field winding with respect to the increase in the amount of field current is the maximum value for the allowable range of values of field current and smaller than 100%. In this case, the control unit calculates a duty ratio under the condition that the upper limit of the duty ratio of the switches is the predetermined value, and turns the switches on and off on the basis of the calculated duty ratio. The control unit sets a higher value of the predetermined value for higher rotation speeds of the rotor (40) or higher values of d-axis current flowing through an armature winding (32).
Inventors:
TAKAHASHI YUKI (JP)
Application Number:
PCT/JP2018/026284
Publication Date:
January 24, 2019
Filing Date:
July 12, 2018
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
H02P9/30; H02K1/14; H02P101/25; H02P101/45; H02P103/20
Foreign References:
| JP2009165232A | 2009-07-23 | |||
| JPH04255451A | 1992-09-10 | |||
| JP2009148057A | 2009-07-02 |
Attorney, Agent or Firm:
YAMADA, Tsuyoshi (JP)
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