Stator hybrid excitation flywheel energy storage motor

Abstract

The invention discloses a stator hybrid excitation flywheel energy storage motor, which belongs to the technical field of electric energy storage, and comprises a flywheel rotor, a stator core and anarmature winding which are arranged around the outer side of the flywheel rotor, an upper end cover and a lower end cover arranged in the upper side and the lower side of the flywheel rotor respectively, an upper exciting winding, an upper ferromagnetic ring and an upper permanent magnet ring which are sequentially distributed in the radial direction from outside to inside, and a lower exciting winding and a lower ferromagnetic ring sequentially distributed along the radial direction from outside to inside. In the energy storage keeping period, the upper permanent magnet ring generates an axial upward electromagnetic force on the flywheel rotor, so that the bearing load is reduced; during charging and discharging, the exciting winding and the upper permanent magnet ring are subjected to hybrid excitation to provide a working magnetic field for the flywheel energy storage motor and provide axial upward electromagnetic force for the flywheel rotor. Thus, the topological structure of themotor can reduce the load and loss of the bearing, reduce the electromagnetic loss in the energy storage maintenance period and improve the energy storage efficiency, and the overall structure of themotor is firm, durable, simple, reliable, low in standby loss and high in cost performance.

Description

technical field [0001] The invention belongs to the technical field of electric energy storage, and more specifically relates to a stator hybrid excitation flywheel energy storage motor. Background technique [0002] With the economical and sustainable development of energy, electric energy storage flywheel energy storage technology has gradually become a research hotspot due to its advantages such as environmental friendliness, short charge and discharge time, long life, and high energy storage density. [0003] The flywheel energy storage motor is the core component of the energy conversion system, and its performance directly affects the performance of the entire flywheel energy storage system. Flywheel energy storage motors usually need to work at high speed, so the motor rotor is required to have high mechanical strength and high reliability. Due to the characteristics of brushless rotor and high efficiency, permanent magnet motors are widely used in flywheel energy st...

AI Technical Summary

Problems solved by technology

The flywheel energy storage system often adopts the magnetic suspension bearing to reduce the loss of the flywheel rotor under high-speed rotation, but the control method of the magnetic suspension bearing is complicated, the cost is high, and the axial length of the motor is increased, which affects the dynamic characteristics of the rotor. Lead to poor compactness of flywheel energy storage system

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