A permanent magnet (PM) motor is an AC motor that utilizes magnets either embedded within the surface of the rotor or attached to it. PM motors can be categorized into two main structures: interior and surface, each with its own subcategories.
The working principle of the magnetic coil in the motor is mainly to use the current to generate a magnetic field in the magnetic coil, which interacts with the magnetic field generated by the permanent magnet or electromagnet to generate a magnetic force and drive the rotor to rotate, thus converting electrical energy into mechanical energy.
Permanent Magnet Synchronous Motors (PMSMs) offer exceptional efficiency as brushless motors. Their permanent magnet rotors endow them with higher torque despite their compact frame size and absence of rotor current, granting them significant advantages over AC Induction Motors (AICMs). Leveraging their impressive power-to-size ratio, PMSMs enable the creation of smaller designs without compromising torque output. Overall, PMSMs deliver a compelling combination of reliability, efficiency, and compactness for a wide range of applications.
A magnetic field magnet is an object that generates a magnetic field and exerts a magnetic effect on its surroundings. Magnets can be naturally occurring or artificial. Magnets are magnetic and can attract substances such as iron, cobalt and nickel. The magnet has a magnetic pole, which is divided into a magnetic North Pole (N pole) and a magnetic South Pole (S pole), and the same sex repels and the opposite sex attracts. Magnetic poles cannot exist alone; they always come in pairs.
Permanent magnet motor is an emerging type of motor which uses permanent magnet to generate magnetic field. It is mainly composed by stator and rotor. In comparison with traditional motors, permanent magnet motors have the advantages of higher efficiency, smaller volume and lighter weight.
High-energy permanent magnets composed of rare earth NdFeB materials are employed to excite the magnetic field in permanent magnet synchronous motors. This enables such motors to achieve substantial reductions in size and weight. The absence of a rotor winding and the compact rotor size contribute to enhanced efficiency in these motors.
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