Low speed and high speed estimates of rotor angle and speed relative to the stator are received from a low speed estimator and a high speed estimator, respectively. LS_θ_EST and a subset of torque-controlling I_Q trajectory curve (“IQTC”) parameter values appropriate to low speed rotor operation are selected for rotor speeds below a low speed threshold value ω_LOW_THRS. HS_θ_EST and a subset of IQTC curve parameter values appropriate to high speed rotor operation are selected for rotor speeds above a high speed threshold value ω_HIGH_THRS. LS_θ_EST and the low speed subset of IQTC parameter values remain selected for rotor speeds less than ω_HIGH_THRS after accelerating to a rotor speed greater than ω_LOW_THRS. HS_θ_EST and the subset of high speed IQTC parameter values remain selected for rotor speeds greater than ω_LOW_THRS after decelerating to a rotor speed less than ω_HIGH_THRS.

A control method for a follow focus wheel, a follow focus wheel and a storage medium are provided. The control method may include: acquiring angular position information of a rotor of a motor of the follow focus wheel and electrical parameters of a coil of the motor; completing an output torque control and a target closed-loop control of the motor based upon the angular position information and the electrical parameters; and determining an operation sensation to be simulated, and controlling the motor to run based on a motor control strategy corresponding to the operation sensation to be simulated so as to provide corresponding operation sensation feedback.

A control method for a follow focus wheel, a follow focus wheel and a storage medium are provided. The control method may include: acquiring angular position information of a rotor of a motor of the follow focus wheel and electrical parameters of a coil of the motor; completing an output torque control and a target closed-loop control of the motor based upon the angular position information and the electrical parameters; and determining an operation sensation to be simulated, and controlling the motor to run based on a motor control strategy corresponding to the operation sensation to be simulated so as to provide corresponding operation sensation feedback.

A motor control system includes a three-phase motor winding; and a thermistor that measures a temperature of any one or two of coils of the three-phase motor winding, the motor control system including a coil temperature estimation unit that calculates an estimated temperature of each of the three-phase coils based on a value of a current flowing through the three-phase motor winding. The motor is controlled based on the estimated temperature of the three-phase motor winding when a difference between the estimated temperatures of the three-phase motor winding is larger than a predetermined value. The motor is controlled based on a measured value of the thermistor when the difference between the estimated temperatures of the three-phase motor winding is equal to or less than the predetermined value.

A motor control system includes a three-phase motor winding; and a thermistor that measures a temperature of any one or two of coils of the three-phase motor winding, the motor control system including a coil temperature estimation unit that calculates an estimated temperature of each of the three-phase coils based on a value of a current flowing through the three-phase motor winding. The motor is controlled based on the estimated temperature of the three-phase motor winding when a difference between the estimated temperatures of the three-phase motor winding is larger than a predetermined value. The motor is controlled based on a measured value of the thermistor when the difference between the estimated temperatures of the three-phase motor winding is equal to or less than the predetermined value.

The invention relates to a method (400) for regulating an electric machine (190) comprising a harmonic regulator (100), wherein the harmonic regulator comprises an input transformer (110), a regulator (120), and an output transformer (130). The method has the steps of: ascertaining (410) a feedback variable (Idq); transforming (420) the feedback variable (Idq); ascertaining (430) a regulating deviation; ascertaining (440) an equalization variable (UHrmc*); back-transforming (450) the equalization variable (UHrmc*); and energizing (480) at least one winding of the electric machine (190) on the basis of the actuating variable (UdqHrmc*).

The invention relates to a method (400) for regulating an electric machine (190) comprising a harmonic regulator (100), wherein the harmonic regulator comprises an input transformer (110), a regulator (120), and an output transformer (130). The method has the steps of: ascertaining (410) a feedback variable (Idq); transforming (420) the feedback variable (Idq); ascertaining (430) a regulating deviation; ascertaining (440) an equalization variable (UHrmc*); back-transforming (450) the equalization variable (UHrmc*); and energizing (480) at least one winding of the electric machine (190) on the basis of the actuating variable (UdqHrmc*).

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 motor control system includes a main control unit, a power supply unit, and a driving unit. The main control unit obtains sampling data of a motor and a power supply signal from the driving unit, generates a motor control signal according to the sampling data, and outputs a safety enable signal when determining that motor drive is abnormal according to the sampling data or when determining that power supply to the driving unit is abnormal according to the power supply signal. The power supply unit supplies power to the main control unit, monitors a state of the main control unit, and outputs a safety cut-off signal when the power supply unit or the main control unit is abnormal. The driving unit drives the motor according to the motor control signal, and switches to a safe path when receiving any one of the safety enable or safety cut-off signal.