Inverter device for electric vehicle
View Patent ↗An inverter device for an electric vehicle includes an inverter circuit that controls an electric motor connected to a wheel via a connecting member and a control unit that controls torque of the electric motor. The control unit includes a current control unit that executes control so that a q-axis current command for the electric motor matches a current flowing through the electric motor, and a limiter unit that puts limitations so that a magnitude of the q-axis current command does not become equal to or smaller than a preset predetermined value.
1. An inverter device for an electric vehicle, comprising:
an inverter circuit that controls an electric motor connected to a wheel via a connecting member; and
a control unit that controls torque of the electric motor,
wherein the control unit includes:
a current control unit that executes control so that torque of the electric motor matches a torque command for the electric motor, or so that a current flowing through the electric motor matches a current command for the electric motor; and
a limiter unit that puts limitations so that a magnitude of the torque command or a magnitude of the current command does not become equal to or smaller than a preset predetermined value,
wherein in an area where a magnitude of the torque command or the current command is small, the predetermined value is set to a value in which a polarity of torque output by the electric motor does not fluctuate between positive and negative.
2. The inverter device for an electric vehicle according to claim 1 , further comprising a lower-limit generating unit that generates the predetermined value, based on a signal corresponding to a speed of the electric motor.