Permanent magnet motors have contributed to the revolution of all-electric propulsion, and rare earths have played an indispensable role

In recent years, the magnetic properties, thermal stability, and corrosion resistance of permanent magnet materials have been significantly improved. The design methods, control technology, and manufacturing processes of permanent magnet motors have developed rapidly, which has promoted the development and application of permanent magnet propulsion technology. The permanent magnet propulsion motor has become one of the iconic technologies of ships and is the main direction for the development of future ship propulsion technology.

Working principle and characteristics of permanent magnet motor

The all-electric propulsion system was born in the 1990s. The U.S. Navy developed a new submarine power system. The main engine power is converted into electricity through the ship’s generator set and then transmitted to the ship’s secondary system. The motor is the core technology. Traditional warships generally use traditional AC and DC motors. The current DC propulsion motors are very large in size and weight, and are difficult to maintain. They have high commutation noise, but their ultimate power is very small, their control response is slow, and their stability is not high. Permanent magnet motors are small in size and light in weight. Compared with traditional motors, they have large output power and simple structure. They can reduce faults and energy consumption, significantly increase the speed and range of submarines, and have significant noise reduction effects. Therefore, if you want to develop an all-electric propulsion system, it is best to use a permanent magnet motor as the core system. This is a development trend.

Permanent magnet motors have broad prospects for application in ship electric propulsion systems. It is necessary for our country to develop the application of permanent magnet motors in ship electric propulsion:

(1) Economic benefits: The comprehensive power saving rate of permanent magnet motor is 20%. Although the initial installation cost is relatively high, due to low operating costs, low maintenance and support costs, and low personnel and low management costs, the whole life cost is greatly reduced. Generally, the ship can recover the excess initial installation cost in two years or even more than a year. invest.

(2) Environmental protection effect: Permanent magnet motors can significantly improve the efficiency of the motor, improve the operation indicators of the entire power grid, and relatively reduce the carbon dioxide emissions generated by the prime mover, which can save a lot of petroleum resources.

(3) Give full play to my country’s resource advantages. my country’s rare earth element raw material stocks account for 87% of the world’s. The development and utilization of rare earth resources is an important strategic decision for our country.

Rare earth permanent magnet motors are an important application field in the rare earth industry. To develop the permanent magnet motor industry and increase the added value of rare earth permanent magnet materials, the advantage of variable resources is an economic advantage.