Why do rare earth permanent magnet motors save energy? Three major components and six major advantages are the key

Six energy-saving advantages of rare earth permanent magnet motors

1. The permanent magnet motor saves 20-40% of energy compared with ordinary motors, and the specific equipment operating conditions are different.

2. The permanent magnet synchronous motor reaches the first-level energy efficiency, and the energy efficiency is above 95%; the ordinary three-phase asynchronous motor has the third-level energy efficiency, and the energy efficiency is only about 90%.

3. The rotor of the permanent magnet synchronous motor has rare earth permanent magnet steel, which does not require the stator to provide induced electricity, and the loss is smaller than that of the ordinary motor;

4. The stator lead wire of the permanent magnet synchronous motor is a star (Y) connection, which can keep the power constant and the current small; most of the ordinary motors use the △ connection;

5. During the operation of the permanent magnet synchronous motor, the energy efficiency value can remain unchanged when the load changes. The energy efficiency value of the ordinary asynchronous motor will change when the load changes, and the energy efficiency of the ordinary asynchronous motor when the load reaches three quarters. The value remains unchanged, and its energy efficiency value will plummet when the load is less than 70%.

6. The no-load current of the permanent magnet synchronous motor is small, only one-tenth of the rated current, while the current of the ordinary asynchronous motor reaches one-third when it is no-load.

Three components of rare earth permanent magnet motor

1. The rare earth permanent magnet motor adopts high-performance permanent magnets, which saves the current excitation of the stator or rotor part of the motor, so it saves the copper loss (winding heating loss) of this part;

2. The brushless structure is adopted, and there is no mechanical loss of the carbon brush structure, but the brushless motor realizes the commutation through the electronic commutation structure. There is a loss of some electronic components here, which is compared with the saved mechanical loss. The value is small, so the loss of the commutation part is smaller than that of the brushed motor;

3. Using high-performance rare earth permanent magnets, under the same rated power and rated speed, the volume of the motor can be made smaller, which saves the silicon steel sheet of the motor and reduces part of the iron loss. Low-power motors using rare earth permanent magnet motors can achieve an efficiency of nearly 90%, and general motors are about 75%.