Abstract: A motor control system for determining a reference d-axis current is provided, and includes a motor, a DC power source and DC input lines, and a current command controller. The DC power source generates a bridge voltage across the DC input lines. The current command controller is in communication with the motor and the DC input lines. The current command controller is configured to monitor the bridge voltage and a torque reference command. The current command controller is configured to determine a peak current based on the torque reference command. The current command controller is configured to determine a current angle based on the peak current. The current command controller is configured to determine the reference d-axis current based on the current angle.

Abstract: A motor control system for determining a reference d-axis current is provided, and includes a motor, a DC power source and DC input lines, and a current command controller. The DC power source generates a bridge voltage across the DC input lines. The current command controller is in communication with the motor and the DC input lines. The current command controller is configured to monitor the bridge voltage and a torque reference command. The current command controller is configured to determine a peak current based on the torque reference command. The current command controller is configured to determine a current angle based on the peak current. The current command controller is configured to determine the reference d-axis current based on the current angle.

Abstract: A motor control system is provided, and includes a motor, at least one differential amplifier configured to monitor phase current applied to the motor, and a current compensation controller. The current compensation controller is in communication with the at least one differential amplifier, and is configured to periodically determine a common-mode voltage of the at least one differential amplifier. The current compensation controller is also configured to determine a corrected phase current value based on the common mode voltage.

Abstract: A motor control system is provided, and includes a motor, at least one differential amplifier configured to monitor phase current applied to the motor, and a current compensation controller. The current compensation controller is in communication with the at least one differential amplifier, and is configured to periodically determine a common-mode voltage of the at least one differential amplifier. The current compensation controller is also configured to determine a corrected phase current value based on the common mode voltage.

Abstract: A motor control system for determining a reference d-axis current is provided, and includes a motor, a DC power source and DC input lines, and a current command controller. The DC power source generates a bridge voltage across the DC input lines. The current command controller is in communication with the motor and the DC input lines. The current command controller is configured to monitor the bridge voltage and a torque reference command. The current command controller is configured to determine a peak current based on the torque reference command. The current command controller is configured to determine a current angle based on the peak current. The current command controller is configured to determine the reference d-axis current based on the current angle.

Abstract: A method for reducing current and torque ripple in a brushed electric motor is disclosed. The motor includes a stator and a rotor. The stator includes a brush housing having a plurality of circumferentially spaced brushes disposed about a commutator, each brush having a contact face that is in electrical contact with the commutator, an opposed bias face and a peripheral wall, each brush disposed in a brush pocket having a pocket wall, a base and a bias spring that is configured to apply a contact force to the bias face, thereby urging the contact face into electrical contact with the commutator. The method includes inserting a damper between each pocket wall or respective base and the respective brush.

Abstract: A method for reducing current and torque ripple in a brushed electric motor is disclosed. The motor includes a stator and a rotor. The stator includes a brush housing having a plurality of circumferentially spaced brushes disposed about a commutator, each brush having a contact face that is in electrical contact with the commutator, an opposed bias face and a peripheral wall, each brush disposed in a brush pocket having a pocket wall, a base and a bias spring that is configured to apply a contact force to the bias face, thereby urging the contact face into electrical contact with the commutator. The method includes inserting a damper between each pocket wall or respective base and the respective brush.