A car electric motor without permanent magnets is cheaper and more efficient

The new development should reduce dependence on Chinese supplies of rare earth metals and make

electric motors are cheaper. In addition, the absence of permanent magnets will increase the efficiency of electric motors in all operating modes.

The innovation in the development of the electric motor lies in the fact that in their overwhelming majority permanent magnets are used, predominantly from rare earth metals.

They are mainly supplied by China, andit is obvious that the country has its own influence on global production. It is noted that due to the monopoly over the past decade, the price of neodymium has increased by 750%, while the cost of dysprosium has increased by 2,000%.

In order not to use magnets,the developers began to replace them with inductors in the motor rotor. This approach has its drawbacks: in order to transfer the electric current to the coils in the rotor, it is necessary to create reliable sliding contact gears. High currents and constant load make such units less reliable, which is unacceptable for electric vehicles with high operating load.

The authors of the new idea proposed a scheme for the induction (wireless) transmission of current to the coils in the rotor, which can be compared to wireless charging of a smartphone.

During testing, the new design showedhigh efficiency: its efficiency at high speeds reaches 95%. Also, an engine without sliding contacts can be serviced much less frequently, which saves time and money in maintaining the transport system in order.

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