Patent ID: 11923797
Assignee: LG ELECTRONICS INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F | IPC F  H

Claim 11:
12. A motor driving device comprising:
an inverter that includes a plurality of switching devices and is configured to output alternating current (AC) power to a motor based on a switching operation;
a switching device that is disposed between the inverter and the motor and is configured to switch windings of the motor to a first connection state or a second connection state; and
a controller configured to control the inverter and the switching device,
wherein the controller is configured to, based on a number of low-speed abnormal operations exceeding a first threshold value within a time period, and based on the windings of the motor being in the second connection state, restrict the windings of the motor from being switched to the first connection state,
wherein the controller is configured to determine the number of low-speed abnormal operations in which the motor is operated at an operation frequency that is equal to or lower than a limit frequency, and
wherein the controller is configured to, based on the number of low-speed abnormal operations being less than the first threshold value within the time period in the second connection state, convert the windings of the motor into the first connection state or the second connection state according to an operation speed of the motor.