Nidec Motor Corporation

Nidec Motor Company

Mile Bozic

Darko Marcetic

Gregory A Peterson

David E Lass

William Joseph Taylor

Keith M Kolmos

Carolyn S Schaefer

An electric motor control system includes a power inverter and control circuitry configured to control the power inverter either according to a target voltage in a voltage-based control mode or according to a target current in a current-based control mode. A controller is operable to switch operation of the control circuitry between the voltage-based control mode and the current-based control mode. The controller may be configured to operate the control circuitry in the current-based control mode at lower motor operating speeds where stator current margin is of greater significance, and to operate the control circuitry in the voltage-based control mode at higher motor operating speeds where stator voltage margin is of greater significance.

Sensorless motor braking system

A fan having one fan blade; a fan motor for rotating the fan blade; a motor control electrically coupled with the fan motor for controlling operational characteristics of the fan motor; and a power supply having a step-down high efficiency buck converter, a step-down low drop-out linear regulator, and/or a step-down switching regulator are described. The power supply may receive a first input voltage and lower the first input voltage to a second lower voltage. The fan motor is electrically coupled to be driven by the first input voltage and the motor control is electrically coupled to operate using the second lower voltage from the power supply. The motor control may include a microcontroller, level shifters electrically coupled to the microcontroller, and drivers electrically coupled to the level shifters and configured to drive the fan motor.

Fan motor power supply

An electric motor control system includes a motor control circuit for generating a motor control signal and a braking mechanism for adjusting the motor control signal to augment motor losses when the motor control circuit is in a braking mode. The braking mechanism includes a difference component for receiving a first signal containing motor reference speed information, for receiving a second signal containing actual speed information, and for generating a third signal containing information indicating a difference between the reference speed and the actual speed. An integrating component integrates the third signal and generates a fourth signal representing the integrated third signal. The fourth signal may augment a voltage control signal in a voltage-based control circuit or may augment a flux-producing component of a current control signal in a current-based control circuit. The electric motor control circuit may include multiple braking mechanisms for use in different modes of operation.

Sensorless motor control

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Barlett, IL, United States of America

Mile Bozic