A motor system includes a reluctance motor and a circuit connected to the reluctance motor. The reluctance motor includes a rotor including N rotor salient poles where N is an integer of 2 or more, a stator including M stator salient poles where M is an integer of 3 or more, 3-phase coils to excite the stator salient poles, and a sensor to detect a rotational position of the rotor. The circuit applies 120-degree conduction to the 3-phase coils when the rotor is rotated in a first direction from a stopped state (initial position), and applies 180-degree conduction to the 3-phase coils when the rotor is rotated in a second direction that is opposite to the first direction from the stopped state.

A motor system includes a reluctance motor and a circuit connected to the reluctance motor. The reluctance motor includes a rotor including N rotor salient poles where N is an integer of 2 or more, a stator including M stator salient poles where M is an integer of 3 or more, 3-phase coils to excite the stator salient poles, and a sensor to detect a rotational position of the rotor. The circuit applies 120-degree conduction to the 3-phase coils when the rotor is rotated in a first direction from a stopped state (initial position), and applies 180-degree conduction to the 3-phase coils when the rotor is rotated in a second direction that is opposite to the first direction from the stopped state.

An electrical system includes an inverter connected to AC and DC voltage buses, a cycloidal electric machine connected to the PIM via the AC voltage bus, and a controller. The machine's rotor is eccentric with respect to the stator, an airgap between the stator and rotor is smaller at an instantaneous center of rotation of the rotor than elsewhere around a circumference of the rotor, and the rotor moves with two degrees of freedom (2DOF), i.e., rotating and orbiting motion. The controller receives a torque command, the rotor position signal, and the current signals, and in response identifies an optimal stator pole or pole pair located proximate the instantaneous center of rotation and energizes the optimal stator pole or pole pair via the PIM prior to energizing another stator pole or pole pair of the stator.

An electrical system includes an inverter connected to AC and DC voltage buses, a cycloidal electric machine connected to the PIM via the AC voltage bus, and a controller. The machine's rotor is eccentric with respect to the stator, an airgap between the stator and rotor is smaller at an instantaneous center of rotation of the rotor than elsewhere around a circumference of the rotor, and the rotor moves with two degrees of freedom (2DOF), i.e., rotating and orbiting motion. The controller receives a torque command, the rotor position signal, and the current signals, and in response identifies an optimal stator pole or pole pair located proximate the instantaneous center of rotation and energizes the optimal stator pole or pole pair via the PIM prior to energizing another stator pole or pole pair of the stator.

The invention suppresses the generation of an excessive current in a SR motor during switching between drive control and brake control. This motor control device is for controlling rotation of a multiphase SR motor, and is provided with a control unit that controls the rotational speed of the SR motor while switching between drive control for generating drive torque in the SR motor and brake control for generating braking torque in the SR motor, wherein the control unit performs switching from the drive control to the brake control or vice versa under the condition that the current flowing through a winding wire of an energized phase is less than a prescribed value.

A control system for a rotary electric machine includes a controller configured to generate dynamic input current data based upon a dynamic analysis of self flux data, mutual flux data, and saturation scaling factor data. Upon generating a torque request, the controller is configured to determine a desired electrical input based upon the dynamic input current data to generate the desired output torque. The desired electrical input includes a magnitude and duration of an electrical pulse and a desired angular position of the rotor of the rotary electric machine relative to the stator of the machine. The controller determines an angular position of the rotor and generates an operating command to generate the desired electrical input at the desired angular position of the rotor to propel the rotary electric machine and generate the desired output torque. A rotary electric machine and method of operating same are provided.

Various embodiments are described herein for methods and systems for controlling a switched reluctance machine (SRM) having an axially extending rotor mounted to a shaft, an axially extending stator disposed coaxially and concentrically with the rotor, the rotor and stator having a plurality of salient poles, the stator poles protruding radially towards the rotor poles, and a plurality of electrical coils wound about the stator poles including a plurality of separate phase coils defining a plurality of phases of the SRM. In one example embodiment, the method comprises providing a control system operatively coupled to a current controller of the SRM, where the control system is configured to generate a unique set of current reference profiles based on an objective function and at least one constraint function and operating the SRM based on the unique set of current profiles generated by the control system.

A motor control method according to an embodiment of a present invention comprises the steps of: performing three-phase commutation in a first range section of a motor rotational speed in a brake mode of a motor; performing two-phase commutation in a second range section of the motor rotational speed performing one-phase commutation in a first range section of the motor rotational speed; and turning off commutation when the motor rotational speed is less than or equal to the first range section.

A motor control method according to an embodiment of a present invention comprises the steps of: performing three-phase commutation in a first range section of a motor rotational speed in a brake mode of a motor; performing two-phase commutation in a second range section of the motor rotational speed performing one-phase commutation in a first range section of the motor rotational speed; and turning off commutation when the motor rotational speed is less than or equal to the first range section.

An SR motor includes a rotor including N rotor salient poles where N is an integer of 2 or more, a stator including M stator salient poles where M is an integer of 3 or more, a shaft rotatably connected to the rotor, a sensor magnet that is fixed to an outer circumference of the shaft and includes an S pole and an N pole alternately arranged in the circumferential direction of the shaft, and three magnetic sensors opposed to the sensor magnet. The number of poles of the sensor magnet is N.