Abstract
The motor is an important part of the flywheel energy storage system. The flywheel energy storage system realizes the absorption and release of electric energy through the motor, and the high-performance, low-loss, high-power, high-speed motors are key components to improve the energy conversion efficiency of energy storage flywheels. This paper analyzes the operating characteristics of the permanent magnet synchronous motor/generator (PMSG) used in the magnetically levitated flywheel energy storage system (FESS) and calculates the loss characteristics in the drive and power generation modes. Based on this, the electromagnetic part of the motor is optimized in detail. Aiming at this design, this paper calculates the loss characteristics of driving and power generation modes in detail, including its winding loss, core loss, rotor eddy current loss and mechanical loss. The calculation results show that the design meets the loss requirements. It can reduce the no-load loss of the permanent magnet synchronous motor at high speed and improve the energy conversion efficiency, which gives this system practical application prospects.
Highlights
The flywheel energy storage system is an energy storage device that converts electrical energy and mechanical energy with a high-speed rotating flywheel rotor as a carrier [1], and it is one of the preferred solutions for short-term energy storage systems
Comparing to above mentioned types, permanent magnet synchronous motors are widely used in high-speed flywheel energy storage systems [5,6]
Vector control is often used in flywheel energy storage systems driven by permanent magnet synchronous motors
Summary
The flywheel energy storage system is an energy storage device that converts electrical energy and mechanical energy with a high-speed rotating flywheel rotor as a carrier [1], and it is one of the preferred solutions for short-term energy storage systems. The requirements of the flywheel energy storage system for the motor are: it can work in the state of electric and power generation; it has good high-speed performance, high efficiency, low no-load loss, small size, low noise, simple structure, easy maintenance, etc. Comparing to above mentioned types, permanent magnet synchronous motors are widely used in high-speed flywheel energy storage systems [5,6]. Vector control is often used in flywheel energy storage systems driven by permanent magnet synchronous motors. The loss of a high-speed permanent magnet synchronous motor includes stator winding loss, core loss, rotor eddy current loss and mechanical loss. The research object of this paper is the permanent magnet synchronous motor/generator (PMSG) used in the magnetic levitation flywheel energy storage system (FESS), which mainly aims at high efficiency, high speed and high output. How to calculate the eddy current loss in the sheath still needs to establish a model for analysis
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