A 2-phase outer ring switched reluctance motor is suitable for use as a low-speed and high-flow rate fan, causes a difference in electrical angle of 180° when two armatures are fitted and coupled along an axial direction at the upper and lower sides thereof one by one and eliminates the difference in electrical angle when two outer ring rotors are fitted and coupled along an axial direction at the upper and lower sides thereof one by one, so as to enable the same to be easily assembled into a 2-phase motor and ensure a firm assembled state, simplifies a structure for detecting an excitation section by modularization in which sensors are provided at each armature and objects to be sensed are provided for each outer ring rotor, and escapes from an unstartable state by using a forward rotation sensor and a reverse rotation sensor.

A 2-phase outer ring switched reluctance motor is suitable for use as a low-speed and high-flow rate fan, causes a difference in electrical angle of 180° when two armatures are fitted and coupled along an axial direction at the upper and lower sides thereof one by one and eliminates the difference in electrical angle when two outer ring rotors are fitted and coupled along an axial direction at the upper and lower sides thereof one by one, so as to enable the same to be easily assembled into a 2-phase motor and ensure a firm assembled state, simplifies a structure for detecting an excitation section by modularization in which sensors are provided at each armature and objects to be sensed are provided for each outer ring rotor, and escapes from an unstartable state by using a forward rotation sensor and a reverse rotation sensor.

A monitoring and control apparatus communicates with an electrical drive of a subsurface artificial lift system to identify, predict and mitigate against failure of the artificial lift system. A monitoring and control apparatus: reads torque signals from the electrical drive or from a measurement device, produces a filtered torque signal; identifies frequency components of the filtered torque signal; compares the frequency components of the filtered torque signal with frequency components of a reference torque signal indicative of a healthy state of a pump motor of the artificial lift system to identify harmful frequencies in the filtered torque signal and generate a failure prediction index representing the likelihood of failure in comparison to a stable operation status; and then send a control signal to the electrical drive to adjust a frequency response of the pump motor so that the identified harmful frequency component is dampened.

Provided is a rotary electrical machine, which is reduced in size of a motor through use of reluctance torque being a feature of an IPM motor, and in which, in driving in times other than a rated time, a current phase angle is shifted from an angle at which a total torque is maximized so that an increase in torque ripple is suppressed even when the current phase angle changes, to thereby provide characteristics of small size, high output, and low torque ripple.

Provided is a rotary electrical machine, which is reduced in size of a motor through use of reluctance torque being a feature of an IPM motor, and in which, in driving in times other than a rated time, a current phase angle is shifted from an angle at which a total torque is maximized so that an increase in torque ripple is suppressed even when the current phase angle changes, to thereby provide characteristics of small size, high output, and low torque ripple.

In a control device for a switched reluctance motor, a voltage drop control is executed in which a voltage dropped to be lower than a voltage applied in a case where the switched reluctance motor is driven in a high-load region is applied to the switched reluctance motor, in a case where the switched reluctance motor is driven in a low-load region. The low-load region is a lower load region than the high-load region.

In a control device for a switched reluctance motor, a voltage drop control is executed in which a voltage dropped to be lower than a voltage applied in a case where the switched reluctance motor is driven in a high-load region is applied to the switched reluctance motor, in a case where the switched reluctance motor is driven in a low-load region. The low-load region is a lower load region than the high-load region.

A control system for a switched reluctance machine includes a capacitor and an inverter connected to the capacitor, wherein the inverter generates current signals and a ripple current returned to the capacitor. A switched reluctance machine (SRM) receives the current signals and generates a position signal. A controller receives the ripple current, current signal values of the current signals, and the position signal and generates desired reference current waveforms received by the inverter to adjust the current signals received by the SRM.

A control system for a switched reluctance machine includes a capacitor and an inverter connected to the capacitor, wherein the inverter generates current signals and a ripple current returned to the capacitor. A switched reluctance machine (SRM) receives the current signals and generates a position signal. A controller receives the ripple current, current signal values of the current signals, and the position signal and generates desired reference current waveforms received by the inverter to adjust the current signals received by the SRM.

A high torque density permanent magnet switched reluctance apparatus with a structure similar to a switched reluctance motor. The apparatus has an inner stator having a plurality of poles, and a rotor disposed radially outward of the inner stator and having a plurality of segments serving as poles. A respective winding is disposed between every pair of adjacent poles of the stator. The apparatus operates with a plurality of separately excitable phases, a given phase being excited by energizing the windings corresponding to the given phase. Excitation of a given phase causes induction of magnetic fluxes traversing a region substantially confined to the region of the stators and rotor segments corresponding to the given phase, and causes a substantial amount of flux to enter rotor segments not in the radial direction but perpendicular to the radial direction.