US 11,791,758 B2
Inverter device and motor device comprising same
Satoshi Shimazu, Kanagawa (JP); and Yuhi Nakada, Kanagawa (JP)
Assigned to NIDEC ELESYS CORPORATION, Kanagawa (JP)
Filed by NIDEC ELESYS CORPORATION, Kanagawa (JP)
Filed on Apr. 6, 2022, as Appl. No. 17/715,013.
Claims priority of application No. 202110381414.3 (CN), filed on Apr. 9, 2021.
Prior Publication US 2022/0329192 A1, Oct. 13, 2022
Int. Cl. H02P 27/08 (2006.01); H02P 27/06 (2006.01); H02P 29/032 (2016.01)
CPC H02P 27/06 (2013.01) [H02P 29/032 (2016.02)] 6 Claims
OG exemplary drawing
 
1. An inverter device, converting power from a power source and driving a motor, wherein
the inverter device comprises:
an inverter circuit having a switch;
a driver circuit used to switch the switch on and off; and
a controller used to control the driver circuit,
wherein the controller has a speed calculator used to calculate a minimum speed of the motor based on a power source voltage,
the inverter circuit comprises an upper arm side switch group and a lower arm side switch group,
the controller controls the driver circuit to switch on and to switch off the upper arm side switch group and the lower arm side switch group,
wherein after the controller performs a fail-safe control, the fail-safe control is ended when a speed of the motor is less than the minimum speed,
wherein the fail-safe control is an active short circuit (ASC) control in which one of the upper arm side switch group and the lower arm side switch group is turned on in all phases and the other is turned off in all phases, or a shut down (SD) control in which both the upper arm side switch group and the lower arm side switch group are turned off in all phases.