A motor drive circuit comprises a motor having a plurality of phases, a switching circuit comprising a plurality of electrical switches, a motor current controller that generates voltage demand signals to be passed to a drive circuit for the switches that in turn generate pulse width modulated switching signals for the switching circuit that cause the switches to selectively connect the phases to a power supply so as to cause current to flow through the phases of the motor, and a motor torque controller that produces a demand signal that is fed to an input of the current controller, the motor current controller responding to an error signal that is at least partially dependent on the value of the demand signal. The torque controller in use updates the demand signal at a first sample rate. The motor drive circuit further comprises a downsampling circuit that in use modifies the demand signal under certain operating conditions so that the demand signal is only updated at a second sample rate that is lower than the first rate.
MOTOR CONTROL FOR ELECTRIC POWER ASSISTED STEERING SYSTEMS
MOTORSTEUERUNG FÜR EINE ELEKTRISCHE SERVOLENKUNGSSTEUERUNG
COMMANDE DE MOTEUR POUR UNITE DE COMMANDE ELECTRIQUE DE DISPOSITIF DE DIRECTION
2019-06-05
Patent
Electronic Resource
English
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