Motor-driven power steering apparatus
AssigneeShowa Corporation
InventorsHarunori Imagawa, Yoshitaka Kubo, Akira Fujisaki
Life of this patent
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Abstract
In a motor-driven power steering apparatus, the main coil winding and auxiliary coil winding are wound around the same slot of a stator core in a parallel manner, a motor drive means has a main driver feeding at least to the main coil windings, and an auxiliary driver feeding only to the auxiliary coil windings, the main driver being actuated so as to be capable of assisting the steering during normal conditions of a control system of an electric motor, and the auxiliary driver is actuated so as to execute an auxiliary assist corresponding to a motor friction torque under abnormal conditions of the control system of the electric motor.
Claims7
A motor-driven power steering apparatus using a brushless motor as an electric motor, having a coil winding around a slot of a stator core and capable of supplying a driving current to the coil winding by a motor drive means, when converting a rotation of the electric motor into a stroke of a rack shaft by a power transmission mechanism, and assisting a steering of a tire wheel connected to the rack shaft, wherein
- a main coil winding and an auxiliary coil winding are wound around the same slot of the stator core in parallel, and
- wherein the motor drive means has a main driver arranged to feed at least to the main coil winding and an auxiliary driver feeding only to the auxiliary coil winding, the main driver being actuatable so as to be capable of assisting the steering under normal conditions of a control system of the electric motor, and the auxiliary driver being actuatable so as to execute an assist control corresponding to a motor friction torque under abnormal conditions of the control system of the electric motor.
Dependencies are inferred from the claim text.