Cooling is the key to determining motor performance. The lower the temperature of the motor magnet, the longer the motor will output the peak power. However, it is not enough to achieve cooling, and it is necessary to ensure that the cooling cost is moderate, the quality is reliable, and the mass production efficiency is high.
Foley said, "The structure of the spoke motor can meet the above requirements. The magnet of the conventional permanent magnet motor is V-shaped and pressed on the pressing piece around the rotor, the pressing depth is very shallow, and the magnet of the spoke motor is vertical like a spoke. On the surface of the aluminum rotor, the magnet is very close to the coolant (60 ° C water / ethylene glycol). In other words, the magnet of the conventional motor is distributed on the tablet, so the coolant cannot be accessed; and the end of the spoke motor magnet is The aluminum center hub, so we can make the coolant close enough to the magnet to achieve the purpose of heat dissipation. Although the production of spoke motor is more difficult than the traditional motor, the motor we designed can be mass-produced, we are very Have confidence."
Foley said that the key to mass production is to implement design details, such as finding a way to mount the tablet on the center hub. “The center hub is basically a forged part. Our cooling is very efficient, so we can get the high strength we need. The temperature of the aluminum center hub is controlled below 100 °C, so we can use magnets that are low in cost but have the same performance, reliability and longevity. Thermal engineering is a key to making an electric car motor stand out."
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