4 results about "Doubly salient" patented technology

This invention discloses a method for open-circuit fault diagnosis and fault tolerance in a four-arm converter with an electrically excited doubly salient pole motor. The method includes: establishing three locations—the DC bus input buses of the first three arms, the upper arm bus of the fourth arm, and the lower arm bus—to install current sensors; dividing the electrical angle period into six operating intervals based on the motor inductance curve to obtain the relationship between the drive signal and the phase current; introducing the power transistor drive signal as a fault characteristic, and locating open-circuit faults in all arms of the power transistors by detecting the amplitude, polarity, and zero-crossing state of the three current sensors; after fault diagnosis, employing a commutation angle optimization strategy for faults in the first three arms, a lower arm constant-on strategy for upper arm faults in the fourth arm, and a fault-tolerant strategy based on excitation polarity reconstruction and potential coordination for lower arm faults. This method requires only three current sensors to achieve full-coverage fault diagnosis and fault-tolerant operation, reducing hardware costs and improving system reliability.

The embodiment of the application discloses an internal high-voltage direct-current power generation system and a parallel control method thereof, relates to the technical field of starting power generation, and can improve the utilization rate of the internal space of an engine and improve reliability. The application comprises a double-rotor electrically excited doubly salient motor installed in the internal space of the engine and an external parallel power supply system. A magnetic isolation material is installed in a stator core, the stator core and an outer rotor core constitute a starter generator installed on a high-pressure shaft of the engine, and the stator core and an inner rotor core constitute a generator installed on a low-pressure shaft of the engine. The starter generator and the generator are combined into a double-rotor electrically excited doubly salient motor, the power density and the utilization rate of the internal space of the engine are improved, parallel control is performed through the external parallel power supply system, the power generation operation of the system is more reliable, and the dynamic performance and the working efficiency of the engine are improved.

The invention discloses an all-parameter hybrid measurement method for a sine-type electro-magnetic doubly salient motor, and relates to the field of sine-type electro-magnetic doubly salient motors, and the method comprises the steps: firstly, taking the temperature change factor into consideration in an offline state, and obtaining armature resistances at different temperatures in an offline manner; then, an excitation flux linkage is determined by off-line actual measurement of any phase of no-load back electromotive force peak value at a specific rotating speed; on the basis of armature resistance and excitation flux linkage obtained through off-line measurement, three enhanced extended state observers are constructed for a motor motion equation of the sine-type electro-magnetic doubly salient motor and motor voltage equations under two orthogonal axis coordinate systems according to an active-disturbance-rejection control theory; according to the method, the design is simple, the measurement precision is high, the robustness is high, and the defect that different methods are adopted to measure mechanical parameters and electrical parameters respectively is avoided.

This invention provides a stator, an electrically excited doubly salient pole motor, and a motor control method, relating to the field of motor technology. It solves the problem of large span of the electric excitation winding in existing electrically excited doubly salient pole motors. The stator includes a stator core, an armature winding, and an excitation winding. The stator core has multiple stator salient poles arranged equidistantly along the circumference, with winding slots formed between adjacent stator salient poles. The armature winding is wound around all the stator salient poles of the stator core within the winding slots. A notch is provided in the yoke of the stator core, connecting the inner and outer sides of the stator core radially, thus breaking the stator core at the notch. The excitation winding is wound on the yoke of the stator core at a position between two adjacent stator salient poles. The excitation winding and the notch are located at opposite ends of the stator core radially. Compared with existing technologies, this invention can reduce the span of the electric excitation winding, lower costs, and improve motor efficiency.