A system and method for torque compensation in a switched reluctance (SR) machine disposed on a machine is disclosed. The system may comprise a SR machine, an inverter and a controller. The controller is in operable communication with the inverter and is configured to determine a commanded main current associated with energization by a main current of a first portion of the plurality of windings for a controlling phase, and determine a commanded parasitic current associated with energization by a parasitic current of a second portion of the windings in a non-controlling phase. The controller is further configured to determine an offset current based on the commanded parasitic current, and determine a target current based on a first sum of the commanded main current and the offset current, and command the inverter to actuate the target current in the first portion of the windings during the controlling phase.

The invention relates to a method for operating an electric machine (1), in particular of a motor vehicle, that has a stator (4) and a rotor (2), wherein the stator (4) has a stator winding (5) having at least three phases (U, V, W), and wherein the rotor is arranged/arrangeable on a rotor shaft (3), wherein a time-invariant differential equation modelling the machine (1) is taken as a basis for ascertaining a desired current value (I.sub.desired,fl) for the stator winding (5) for producing a required torque and/or a required rotation speed, wherein the desired current value (I.sub.desired,fl) is compared with an actual current value (I.sub.actual,fl) of the stator winding (5), which actual current value corresponds to electric phase currents (I.sub.U, I.sub.V, I.sub.W) flowing through the phases (U, V, W), and wherein the comparison is taken as a basis for passing current through the phases (U, V, W) such that a difference from the actual current value (I.sub.actual,fl) to the desired current value (I.sub.desired,fl) is reduced. There is provision for the time-invariant differential equation to be ascertained on the basis of a periodic, linear differential equation by means of a Floquet transformation.

The present embodiment is a high rotor pole switched reluctance machine (HRSRM) which provides a plurality of combinations of the number of rotor poles R.sub.n and number of stator poles S.sub.n utilizing a numerical relationship defined by a mathematical formula, R.sub.n=2S.sub.n−F.sub.p, when S.sub.n=m×F.sub.p, wherein F.sub.p is the maximum number of independent flux paths in the stator when stator and rotor poles are fully aligned, and m is the number of phases. The mathematical formulation provides an improved noise performance and design flexibility to the machine. The mathematical formulation further provides a specific number of stator and rotor poles for a chosen m and Fp. The HRSRM can be designed with varying number of phases. The HRSRM provides a smoother torque profile due to a high number of strokes per revolution.

The present embodiment is a high rotor pole switched reluctance machine (HRSRM) which provides a plurality of combinations of the number of rotor poles R.sub.n and number of stator poles S.sub.n utilizing a numerical relationship defined by a mathematical formula, R.sub.n=2S.sub.n−F.sub.p, when S.sub.n=m×F.sub.p, wherein F.sub.p is the maximum number of independent flux paths in the stator when stator and rotor poles are fully aligned, and m is the number of phases. The mathematical formulation provides an improved noise performance and design flexibility to the machine. The mathematical formulation further provides a specific number of stator and rotor poles for a chosen m and Fp. The HRSRM can be designed with varying number of phases. The HRSRM provides a smoother torque profile due to a high number of strokes per revolution.

A vibration and noise-reduced electric-motor device for an electrical household appliance or an electrical sliding roof. The invention includes a method for the vibration and noise-reduced operation of an electric-motor device. The electric-motor device has an electric-motor assembly, a main body, and a driven group of accessories. The electric motor assembly includes an electric motor, a control and evaluation unit, a data memory, a current regulator, a rotor angle sensor and a torque evaluator. The electric motor has a stator, a rotor and motor coils. In the method, a setpoint current stored in a value table in the data memory is applied to the motor coils in accordance with the rotor angle. The torque deviation resulting at the setpoint current, between the setpoint torque and the actual torque is determined, and an optimized new setpoint current value is calculated by interpolation and is written into the value table.

A method for the noise-reduced operation of a switched reluctance motor with a reluctance motor assembly. The assembly includes the switched reluctance motor; —a control and evaluation unit; —a data memory; —a current regulator; —a rotor angle sensor; and —a torque evaluator. The switched reluctance motor includes a stator, a rotor and motor coils. The size of the current applied to the motor coils is stored in a value table in the data memory for different rotor angles. An actual torque is detected, and a deviation between a setpoint torque and the determined actual torque is determined. On the basis thereof, the current values are recalculated. The recalculated current values are written into the value table and define the basis of the next run.

A method for the noise-reduced operation of a switched reluctance motor with a reluctance motor assembly. The assembly includes the switched reluctance motor; —a control and evaluation unit; —a data memory; —a current regulator; —a rotor angle sensor; and —a torque evaluator. The switched reluctance motor includes a stator, a rotor and motor coils. The size of the current applied to the motor coils is stored in a value table in the data memory for different rotor angles. An actual torque is detected, and a deviation between a setpoint torque and the determined actual torque is determined. On the basis thereof, the current values are recalculated. The recalculated current values are written into the value table and define the basis of the next run.

A variable reluctance motor load mapping apparatus includes a frame, an interface disposed on the frame configured for mounting a variable reluctance motor, a static load cell mounted to the frame and coupled to the variable reluctance motor, and a controller communicably coupled to the static load cell and the variable reluctance motor, the controller being configured to select at least one motor phase of the variable reluctance motor, energize the at least one motor phase, and receive motor operational data from at least the static load cell for mapping and generating an array of motor operational data look up tables.

A variable reluctance motor load mapping apparatus includes a frame, an interface disposed on the frame configured for mounting a variable reluctance motor, a static load cell mounted to the frame and coupled to the variable reluctance motor, and a controller communicably coupled to the static load cell and the variable reluctance motor, the controller being configured to select at least one motor phase of the variable reluctance motor, energize the at least one motor phase, and receive motor operational data from at least the static load cell for mapping and generating an array of motor operational data look up tables.

An SR drive with an acoustic noise reduction system for reducing vibration and acoustic noise in a switched reluctance motor (SRM). The vibration and acoustic noise at specific harmonics of current excitation in SRM are in a proportional relationship with the radial force harmonics acting at SRM stator teeth. The acoustic noise reduction system includes a processor on which is installed an acoustic noise reduction application designed to derive an optimum current waveform for generating an average torque satisfying an optimum torque condition and creating radial force with minimum amplitude at the desired order of harmonics of current excitation. A reduction in the amplitude of the specific radial force harmonics utilizing the optimum current waveform minimizes the vibration and acoustic noise in the SRM. The acoustic noise reduction system applies turn-on and turn-off angles at the optimum current waveform to improve the system efficiency.