The invention determines at least one of the angular speed and the angular position of a rotor of an electric machine through determination of the harmonics, using a closed loop comprising a harmonic observer, phase difference correction and a first phase-locked loop that estimates the position of the rotor.

A smart electronic power steering system and method for a retrofitted electric vehicle are provided. In one embodiment, an electronic power steering system comprises a relief valve; a pump in communication with the relief valve; a motor configured to operate the pump; a motor controller configured to control the motor; and a processor. The processor is configured to receive a desired maximum pressure value from a retrofitted electric vehicle and configure the relief valve or motor controller to provide relief at the desired maximum pressure value; and receive a desired flow rate from the retrofitted electric vehicle and configure the motor controller to operate the motor at a speed to achieve the desired flow rate. Other embodiments are provided.

A smart electronic power steering system and method for a retrofitted electric vehicle are provided. In one embodiment, an electronic power steering system comprises a relief valve; a pump in communication with the relief valve; a motor configured to operate the pump; a motor controller configured to control the motor; and a processor. The processor is configured to receive a desired maximum pressure value from a retrofitted electric vehicle and configure the relief valve or motor controller to provide relief at the desired maximum pressure value; and receive a desired flow rate from the retrofitted electric vehicle and configure the motor controller to operate the motor at a speed to achieve the desired flow rate. Other embodiments are provided.

A method for determining a direction of rotation for an electronically commutated motor (ECM) is described. The motor is configured to rotate a blower and the method comprises rotating the blower using the ECM and determining if the resulting blower rotation is indicative of the desired direction of rotation for the blower.

A method for determining a direction of rotation for an electronically commutated motor (ECM) is described. The motor is configured to rotate a blower and the method comprises rotating the blower using the ECM and determining if the resulting blower rotation is indicative of the desired direction of rotation for the blower.

A three-phase regenerative drive configured for operation from a single phase alternating current (AC) power source, the three-phase regenerative drive including a three-phase converter having inputs for connection to a single-phase AC source, the three-phase converter having three phase legs, a three-phase inverter for connection to a motor, the three phase inverter configured to provide three phase command signals to the motor, and a DC bus connected between the three-phase converter and the three-phase inverter. A first phase leg of the three-phase converter and a second phase leg of the three-phase converter are employed to direct current from the single-phase AC source to the DC Bus and a third phase leg of the three phase legs of the three-phase converter returns current to a return of the AC source.

A method of calibrating a motor assembly includes selecting an electric motor and a motor controller for the motor assembly, obtaining at least one electric motor parameter of the electric motor, determining a correction factor for the electric motor based upon the at least one electric motor parameter, and programming the motor controller with the correction factor.

A method of calibrating a motor assembly includes selecting an electric motor and a motor controller for the motor assembly, obtaining at least one electric motor parameter of the electric motor, determining a correction factor for the electric motor based upon the at least one electric motor parameter, and programming the motor controller with the correction factor.

A motorized shade comprising a motor adapted to lower or raise a shade material for selectively covering an architectural opening based on a position of the sun. The motorized shade comprises a controller adapted to drive the motor phase according to a startup sequence by ramping up amplitude form an initial amplitude to a startup amplitude and ramping up frequency from an initial frequency to a drive frequency, drive the motor phase according to a full drive sequence to move the shade material by driving the motor phase according to a sinusoidal waveform at a set maximum amplitude and at a drive frequency, and drive the motor phase according to a wind down sequence by reducing frequency from the drive frequency to an end frequency and reducing the amplitude from the maximum amplitude to an end amplitude.

An inverter controller includes a processing circuitry. The processing circuitry is configured to obtain a command rotation speed transmitted repeatedly from outside of the inverter controller, count a command obtaining interval that is a period from a point in time where an old command rotation speed was obtained to a point in time where a new command rotation speed is obtained, set a target acceleration of the electric motor when the command rotation speed has been obtained, and control the inverter circuit such that the electric motor rotates at the set target acceleration. The processing circuitry is configured to calculate a command acceleration based on the counted command obtaining interval and the new command rotation speed, the command acceleration being set as the target acceleration.