Electric power steering apparatus
AssigneeKoyo Seiko Co., Ltd.
InventorsShigeki Nagase, Katsutoshi Nishizaki, Takeshi Ueda
Life of this patent
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Abstract
A resistor member having a resistance value substantially equal to a resistance of a relay in an ON state is inserted into a current supply path which is not inserted with the relay in current supply paths for supplying currents from a driving circuit to a brushless motor. Further, in the driving circuit, widths of bus bars forming wirings are set such that resistances of the wirings (contact resistance) from a branch point on power source side to Hi side FET (source terminals thereof) are equal to each other and widths of bus bars forming the wirings are set such that the resistances of the wirings from a ground side branch point NL to Lo side FET (source terminals thereof) become equal to each other.
Claims4
An electric power steering apparatus for applying a steering assisting force to a steering mechanism of a vehicle by driving a brushless motor based on a target value determined in accordance with an operation for steering the vehicle, the electric power steering apparatus comprising:
- a control operating unit that calculates an instruction value of a voltage to be applied to the brushless motor based on the target value;
- a driving circuit that drives the brushless motor based on the instruction value;
- and
- a resistance adjusting unit that adjusts resistance components in a motor-driving circuit system such that differences among respective phases of the resistance components in the motor-driving circuit system including the brushless motor and the driving circuit become equal to or smaller than a predetermined value.
Dependencies are inferred from the claim text.