A CONTROLLER AND A METHOD TO DRIVE AN INVERTER CIRCUIT FOR A PERMANENT- MAGNET SYNCHRONOUS MOTOR

摘要

A controller 100 is provided to drive an inverter circuit 112 for a PMSM 104. The inverter circuit 112 is connected to a battery 114 through a DC link capacitor 202, and is driven in one safe state during a fault condition. The controller 100 monitors at least one parameter with respective threshold value to drive the inverter circuit 112 in one safe state comprising an active Short Circuit (SC) and a Freewheel (FW). While in FW state, the controller 100 switches from the FW state to the SC state if the at least one parameter is above the respective threshold. While in SC state, the controller 100 controls engine speed to bring the PMSM 104 to a predetermined speed when the stator temperature 312 is more than a threshold temperature value 310. The controller 100 switches from the SC state to the FW state.Figure 1