A control system for an electrical motor comprises a rotor, a stator having a plurality of phase windings, and an inverter for applying voltage to the plurality of phase windings by connecting individual phase windings to a first or second voltage level. The control system is configured to measure a first rate of change of current in a first phase winding, of said plurality of phase windings, connected to the first voltage level, to measure a second rate of change of current in a second, different phase winding connected to the first voltage level, and to calculate a difference between the first and second rate of change of current. The control system is further configured to use the calculated difference to obtain data related to a position of the rotor.

A control system for an electrical motor comprises a rotor, a stator having a plurality of phase windings, and an inverter for applying voltage to the plurality of phase windings by connecting individual phase windings to a first or second voltage level. The control system is configured to measure a first rate of change of current in a first phase winding, of said plurality of phase windings, connected to the first voltage level, to measure a second rate of change of current in a second, different phase winding connected to the first voltage level, and to calculate a difference between the first and second rate of change of current. The control system is further configured to use the calculated difference to obtain data related to a position of the rotor.

A method estimating position and speed of a rotor of an alternating current machine for a motor vehicle. The method: determines stator currents in a three-phase reference frame and values of stator voltages of the machine in the three-phase reference frame; determines components of the stator currents in a two-phase reference frame depending on the stator currents in the three-phase reference frame by Concordia transformation; determines components of the stator voltages in the two-phase reference frame depending on the stator voltages in the three-phase reference frame by Concordia transformation; iteratively determines rotor speed depending on the stator voltages in the two-phase reference frame and adjustment parameters; determines stator fluxes of the machine in the two-phase reference frame depending on the rotor speed and rejection parameters; and determines rotor position depending on the stator fluxes in the two-phase reference frame, the stator currents in the two-phase reference frame, and equivalent inductance.

A method estimating position and speed of a rotor of an alternating current machine for a motor vehicle. The method: determines stator currents in a three-phase reference frame and values of stator voltages of the machine in the three-phase reference frame; determines components of the stator currents in a two-phase reference frame depending on the stator currents in the three-phase reference frame by Concordia transformation; determines components of the stator voltages in the two-phase reference frame depending on the stator voltages in the three-phase reference frame by Concordia transformation; iteratively determines rotor speed depending on the stator voltages in the two-phase reference frame and adjustment parameters; determines stator fluxes of the machine in the two-phase reference frame depending on the rotor speed and rejection parameters; and determines rotor position depending on the stator fluxes in the two-phase reference frame, the stator currents in the two-phase reference frame, and equivalent inductance.

Methods, apparatuses, and systems are provided for controlling an electrical drive machine. Actuator stator currents of the electrical drive machine are measured. A manifestation of an internal state of the electrical drive machine are estimated based on the measured actuator stator currents. A quality criterion is ascertained for the estimated manifestation of the internal state of the electrical drive machine. The estimated manifestation is forwarded if the quality criterion is satisfied.

Methods, apparatuses, and systems are provided for controlling an electrical drive machine. Actuator stator currents of the electrical drive machine are measured. A manifestation of an internal state of the electrical drive machine are estimated based on the measured actuator stator currents. A quality criterion is ascertained for the estimated manifestation of the internal state of the electrical drive machine. The estimated manifestation is forwarded if the quality criterion is satisfied.

In some examples, a controller device includes processing circuitry configured to determine an alpha voltage and a beta voltage based on time durations for control signals for power-conversion circuitry that drives an electric motor including a rotor. In some examples, the controller device also includes a flux estimator configured to estimate a speed of the rotor and an angle of the rotor based on the alpha voltage and the beta voltage.

A motor controller includes: a rotation speed estimating unit that estimates a rotation speed of a motor based on current information and primary frequency information of the motor; a proximity switch that outputs an ON signal when a portion of a rotating body of the motor is in proximity and that outputs an OFF signal when a portion of the rotating body of the motor is not in proximity; a rotation speed calculating unit that calculates a rotation speed of the motor based on the ON signal and the OFF signal output from the proximity switch; a speed command compensating unit that compensates a speed command value such that an error between the speed command value and a rotation speed calculation value becomes smaller; and a speed control system that perform the speed control on the motor based on the compensated speed command value and the rotation speed estimation value.

A motor controlling method includes a step of obtaining a resultant magnetic flux and a stator current, which are represented by a phasor, with respect to an fixed coordinate system or a dq rotating coordinate system, a step of calculating a torque angle () according to:

=cos.sup.1[(.sub.s.sup.2+.sub.m.sup.2(LI.sub.s).sup.2)/(2.sub.s.sub.m)],

where L is an armature inductance, .sub.m indicates a magnetic flux of a stator magnet, .sub.s indicates a magnitude of the resultant magnetic flux, and I.sub.s indicates a magnitude of the stator current, and a step of controlling the surface permanent magnet motor based on the torque angle ().

Systems and method for controlling an alternating current (AC) electrodynamic machine (390) with a variable frequency drive (VFD) (380) include a control system (300) with a phase-locked-loop (PLL) circuit (382) for providing a stator flux angle signal (338) to the VFD (380), the PLL circuit (382) comprising a proportional integral (PI) regulator (332) providing an output signal (334); and a feedforward generator (350) in communication with the PLL circuit (382), wherein the feedforward generator (350) tracks a stator flux position of the AC electrodynamic machine (390) such that the feedforward generator (350) determines a stator frequency signal (352) based on stator flux signals (308, 310, 312) and supplies the stator frequency signal (352) downstream of the PI regulator (332), and wherein the stator frequency signal (352) is summed with the output signal (334) of the PI regulator (332) to provide a dynamically adapted output signal (335) of the PI regulator (332), and wherein the adapted output signal (335) is used to determine the stator flux angle signal (338).