Flywheel Energy Storage Device for Electrically Excited Doubly Salient Motor

Abstract

The invention provides a flywheel energy storing device of a double-salient pole electro-magnetic motor. When the flywheel energy storing device does not transfer energy with the outside, a motor exciting winding is set in an open-circuit state so that no magnetic field remains in air gaps of the motor and no eddy-current loss and no magnetic hysteresis loss exist in the interior of the iron coreof the motor, thus the energy consumption of the flywheel energy storing system can be obviously reduced, the energy storing time of a flywheel can be greatly prolonged and the overall energy conversion efficiency of the system and the security of the system can be improved. The device comprises an upper magnetic bearing (1), a vacuum cavity (2), a flywheel body (3), a shell (4), a motor rotor (5), a motor stator (6), a lower magnetic bearing (7) and a flywheel rotating shaft (8), wherein a motor stator iron core (601) is formed by connecting 2n circular arc iron cores into a round shape, wherein the number n is a natural number; and an exciting winding (602) is arranged between every two circular arc iron cores, and an armature winding (603) is arranged on the gear of the inner circle ofthe motor stator iron core (601).

Description

technical field [0001] The invention belongs to the technical field of electric energy storage, and specifically relates to a novel high-efficiency flywheel energy storage device. Background technique [0002] With the rapid development of new energy power generation and electric vehicles, the application of electric energy storage devices is becoming more and more extensive. Among many electrical energy storage devices, flywheel energy storage devices are receiving more and more attention because of their good dynamic performance and no secondary pollution. The basic principle of flywheel energy storage is that first, the motor is used as a motor to drive the flywheel to accelerate, and the electrical energy is converted into kinetic energy and stored on the flywheel rotor. When necessary, the flywheel drives the motor to operate as a generator, and the kinetic energy in the flywheel is converted into electrical energy. . Since the kinetic energy stored in the flywheel ro...

AI Technical Summary

Problems solved by technology

Therefore, when the flywheel energy storage system does not transmit energy with the outside world, that is, when the system is in the energy storage working state, as the flywheel rotates at a high speed, the permanent magnetic field will generate eddy current loss and hysteresis loss inside the motor core, which will continuously consume the flywheel. The energy stored in the motor, the higher the speed, the stronger the magnetic field in the motor core, the greater the loss

This not only leads to waste of energy, but also reduces the overall efficiency of the flywheel energy storage system, making the current flywheel energy storage time very short (as short as a few minutes, as long as tens of minutes), which greatly limits the application of flywheel energy storage devices

Moreover, eddy current loss and hysteresis loss will also cause heating of the motor core, which will reduce the safety of the flywheel energy storage system, and at the same time put forward higher requirements for the heat dissipation of the flywheel energy storage system, making the overall structure of the flywheel energy storage system more complicated. Also put forward higher requirements on the manufacturing process

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