Why are permanent magnet motors more energy efficient?

A permanent magnet motor is a motor with its own permanent magnets in the rotor. It has many advantages such as reliable operation, small size, light weight, low loss, and high power. It is a super-efficient motor. The energy-saving effect of permanent magnet motors is more significant than that of asynchronous motors. What is the reason?

First of all, in terms of planning and structural methods, the rotor of the permanent magnet motor has earth permanent magnet steel and does not require a stator to supply induction power; the permanent magnet motor uses a star connection Y, and the asynchronous motor above 4kw has a △ connection, Y connection The current is smaller than the △ connection method; the materials used in the permanent magnet motor are different and the insulation level is high. On the premise of keeping the power constant, the frame size can be reduced, the copper consumption is reduced, and the permanent magnet motor has good control performance and can be adjusted The starting torque is adjusted to meet the needs of large torque starting, and then the motor model is reduced to avoid the situation of a large horse-drawn cart.