IN-WHEEL MOTOR DRIVE DEVICE

摘要

Provided is an in-wheel motor drive device which detects an abnormality with high precision over the entire operation range of a motor by measuring the temperatures of a lubricating oil and a motor coil. The in-wheel motor drive device includes an electric motor (1), a wheel bearing (5), a speed reducer (2), a lubricating oil supply mechanism (Jk), and a controller (U1). An oil temperature sensor (Sb) is disposed in a lubricating oil passage (29) in the speed reducer (2), and a coil temperature sensor (Sa) is disposed on a motor stator. The controller (U1) includes a motor output limit (95) that limits an electric current in the electric motor (1) when at least one of temperatures measured by the oil temperature sensor (Sb) and by the coil temperature sensor (Sa) has exceeded a corresponding predefined threshold.

主权项

1. An in-wheel motor drive device comprising:
an electric motor configured to drive a wheel; a wheel bearing configured to rotatably support the wheel; a speed reducer configured to transmit rotation with a speed that is reduced with respect to that of rotation of the electric motor to the wheel bearing; a lubricating oil supply mechanism including a lubricating oil passage formed inside a speed reducer housing of the speed reducer, and a supply oil passage configured to supply a lubricating oil from the lubricating oil passage to the electric motor; an oil temperature sensor disposed in the lubricating oil passage in the speed reducer to measure a temperature of the lubricating oil in the lubricating oil passage; a coil temperature sensor disposed on a stator of the electric motor to measure a temperature of a motor coil; and a controller configured to control the electric motor, and including a motor output limiting module configured to limit an electric current in the electric motor when at least one of the temperature measured by the oil temperature sensor and the temperature measured by the coil temperature sensor has exceeded a corresponding predefined threshold value.