Permanent magnet generator

What is a permanent magnet generator

A permanent magnet generator (PMG) is an AC rotating generator that utilizes permanent magnets to generate a magnetic field, eliminating the need for an excitation coil and excitation current.

Current situation of permanent magnet generator

With the development of national economy and the increasing improvement of people’s living standard, the demand for electric energy is increasing day by day. Since the 1980s, countries all over the world have been developing non-polluting and renewable clean energy sources-such as wind and solar power-to reduce carbon dioxide and sulfur dioxide emissions and improve and restore the earth’s environment. Permanent magnet generators (PMGs) are widely used in wind turbines due to their high efficiency, simple structure and high reliability, and have become the standard for wind power generation. The widespread adoption of permanent magnet generators (PMGs) for wind turbines has promoted the development of PMGs. The adoption of pm synchronous generator for wind turbines has not only led to a significant reduction in the maintenance cost of wind turbines and a reduction in the cost of wind power, but has also improved the utilization rate of wind energy and increased the benefits for customers.

Permanent magnet generators are not only used in wind turbines, but also widely used in aerospace, large-scale thermal power station sub-exciter power generation, tidal power generation, sea current power generation, surge power generation, internal combustion power generation and steam power generation, mobile power supply, vehicle generators and other power generation. The widespread use of permanent magnet generators is bound to promote the research and development of permanent magnet materials. When the magnetic integrated performance of better permanent magnet pole induction strength of 0.7T, 0.8T, permanent magnet generator power can reach 30MW or even greater, by that time, permanent magnet generator is not only suitable for wind turbines, sea current power generation units, surge generator sets, etc., but also for hydropower, thermal power and other power generation equipment generators, permanent magnet generator to replace the excitation of the generator will become inevitable.

Advantages of magnet generator:

First, high efficiency, low loss

The main magnetic field of the conventional excitation generator is formed by the excitation winding through the excitation current, and the excitation system consumes electric power, and the loss of Mingteng permanent magnet generator (https://www.mingtengmotor.com/) accounts for about 60% of the loss of conventional excitation generator. Mingteng PMG adopts NdFeB, the best permanent magnetic material, as the main magnetic field, which has no excitation loss and high efficiency.

Second, Small size and light weight

Small size and light weight. There is no excitation winding in MINGTEN permanent magnet generator, and its weight is more than 20% lighter than the conventional excitation generator.

Third, simple structure, high reliability, low maintenance

Conventional excitation generator not only has excitation winding, often the main generator coaxial also drag an excitation generator, complex structure, relatively high failure rate, Mingteng permanent magnet generator structure is simple, simple to the extent of maintenance-free or only need to maintain the bearings, the failure rate is lower than the conventional excitation generator, and convenient and easy to repair.

Fourth, low temperature rise, low noise

Because Mingteng PMG does not have the loss generated by the excitation winding which is necessary for conventional excitation generators, the temperature rise of PMG is lower than that of conventional excitation generators by 2~10K and the noise is lower than that of conventional excitation generators by 2~10dB.

Five, Minteng permanent magnet ac generator can do multi-pole low speed

Due to the excitation winding, it is difficult to accommodate multi-pole winding in the rotor, thus the conventional excitation generator can not do multi-pole low-speed, while Mingteng PMG can do multi-pole low-speed, and it can do 48 poles, 60 poles or even larger, which can not be done by the conventional excitation generator.

Since 2014, a steam turbine company in Shaanxi purchased our first permanent magnet generator (model TYSF22-6), to 2023, a rent company in Thailand purchased our permanent magnet generator (model TYBF-315L2/T-6), there has been no quality problem in the past 10 years, and the customers are all over the domestic and foreign petroleum, coal mine, steam turbine, marine and other industries, which is widely praised and has become a great help for customers to expand the market scope. We have a good and continuous cooperation relationship with customers.

Mingteng has built five-span standardized large-scale production plants and warehouses, with more than 190 sets of various types of production equipment. Mingteng has a high-quality R & D technical team of 40 people, who have mastered the most advanced means of designing permanent magnet motors (PMGs), and have unique understanding and advantages in the design of PMGs’ magnetic circuits, etc. We have also adopted three-dimensional modeling to establish CAE simulation calculations of electromagnetic field, fluid field, temperature field, stress field, and so on, to Improve the efficiency of permanent magnet generator, have a large number of first-hand design, manufacturing, testing, use of data, to ensure that the high performance of the permanent magnet generator design technology level. 10 years of professional manufacturing experience in permanent magnet generator, the formation of a complete and mature production process system, to ensure that the performance and quality of each permanent magnet generator produced.