Patent ID: 7595599
Filing Date: 2009-09-29
Classification: B60K,B60L,Y02T

Abstract:
1. An electric motor operation control circuit that controls the drive and regeneration of an electric motor that drives a driven body, comprising: a comparison circuit that compares the phase of a detection signal, which is obtained based on the output of sensor which detects motion of the driven body, and the phase of a reference signal, and forms a drive control signal and a regeneration control signal based on the phase difference; a PWM drive control part that forms a drive signal for which a duty ratio is set based on the drive control signal, and supplies the formed drive signal to a drive circuit of the electric motor; a regenerative control part that forms a regenerative permission signal for which a duty ratio is set based on the regeneration control signal; a storage control part that controls regenerative electric energy supplied to a storage mechanism that stores electric energy to be recovered by the electric motor based on the regenerative permission signal; and an operation control part that sets a control mode of the drive or regeneration of the electric motor according to the status of the driven body based on the output of the sensor, wherein the electric motor has a movable body constituted from a magnetic body and a plurality of phase coils; wherein the operation control part controls one or more of the phase coils for driving and/or regeneration according to the operation status of the driven body; wherein, when the driven body is in a low load state, the operation control part performs control so as to simultaneously use a part of the plurality of phase coils for driving and the other phase coils for regeneration; and wherein the operation control circuit has a memory that stores a table of combination of the phase coils to be drive controlled or regenerative controlled according to the operation status of the driven body, and refers to the memory to determine the phase coil to be excited or regenerated based on the sensor output.