The new development should reduce dependence on Chinese supplies of rare earth metals and make
The innovation in the development of electric motors lies in the fact that the vast majority of them use permanent magnets, mainly made of rare earth metals.
Their supplies are mainly carried out by China, andit is obvious that the country has its influence on global production. It is noted that due to the monopoly over the past decade, the price of neodymium has increased by 750%, and 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 inductive (wireless) current transfer to coils in the rotor; this can be compared to wireless charging of a smartphone.
During testing, the new design showedhigh efficiency: its efficiency at high speeds reaches 95%. Also, a motor without sliding contacts can be serviced much less frequently, which saves time and money on maintaining the transport system in order.
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