Power conversion device, motor drive unit, and electric power steering device
AssigneeNidec Corporation
InventorHiromitsu OHASHI
Life of this patent
Estimating the term…
Abstract
A power conversion device includes a first inverter connected to first ends of windings of each phase of a motor, a second inverter connected to second ends of the windings of each phase, and a first switching circuit including at least one of a first switch to switch between whether the first inverter and a power supply are connected or disconnected and a second switch to switch between whether the first inverter and a ground are connected or disconnected. The power conversion device has a first operation mode when the motor is driven at a low speed, and a second operation mode when the motor is driven at a high speed.
Claims13
A power conversion device which converts power from a power supply to power to be supplied to a motor with n-phase windings, where n is an integer of 3 or greater, the power conversion device comprising:
- a first inverter connected to first ends of windings of each phase of the motor;
- a second inverter connected to second ends of the windings of each phase;
- and
- a first switching circuit including at least one of a first switch to switch between whether the first inverter and the power supply are connected or disconnected and a second switch to switch between whether the first inverter and a ground are connected or disconnected;
- wherein
- the power conversion device has a first operation mode in which power conversion is performed using the second inverter and a first neutral point in the windings of each phase of the first inverter when the motor is driven at a low speed, and a second operation mode in which power conversion is performed by n-phase energization control of the first and second inverters when the motor is driven at a high speed.
Dependencies are inferred from the claim text.