[Call for Joint Development] A small high-power motor developed by Professor Masato Enokizono of the Vector Magnetic Properties Research Institute, capable of continuous operation at 10,000 RPM with a diameter of approximately 10 cm and air cooling.
On March 22, we introduce the "Induction Motor" featured in the newspaper.
▼ What is an "Induction Motor":
It has a simple and robust structure, can withstand harsh environments, is low-cost, and requires no maintenance. However, its use in EVs necessitates larger sizes to produce high output, which leads to overheating and makes long-duration operation challenging... Therefore, we successfully invented a practical 80μm steel plate!
This presents a new option that overturns the common belief that "induction motors are impossible!"
■ Utilized in various industries, simple and robust, resistant to harsh environments, low cost, maintenance-free
■ High output requires larger sizes, but high output can also be achieved with small sizes through high-speed rotation, though heat generation in the iron core is an issue
■ Currently, electromagnetic steel plates are about 300μm; thinning reduces heat generation, and we have invented a practical 80μm steel plate
■ Thin steel plates are difficult to laminate, so we will mass-produce them using a winding lamination method.
A dual-type rotor that is sandwiched from both sides further increases torque
■ EV synchronous motors generate significant coil heat, and magnets are sensitive to heat, requiring water cooling systems; the developed induction motor uses air cooling, and low output can be integrated into four wheels
■ Challenges for high-speed operation include coil winding, processing ultra-thin electromagnetic steel plates, and achieving low friction in the rotating shaft.
We aim for practical application through joint research with specialized technology manufacturers.
