Surface-Mounted Permanent Magnet (SPM) Rotor

Advantages:

1）High Magnetic Flux Utilization: Magnets are directly exposed on the rotor's surface, ensuring maximum flux linkage and higher efficiency in generating torque.

2）Simple Design and Manufacturing: The straightforward construction of placing magnets on the surface makes the design and production process less complex and cost-effective.

3）High Power Density: The absence of additional structural elements allows for a compact design with high torque output relative to the rotor's size.

4）Ideal for Low to Moderate Speed Applications: Due to the simplicity and efficient flux usage, SPM rotors are well-suited for low- to moderate-speed operations.

5）Lower Magnetic Reluctance: The uniform air gap flux profile minimizes reluctance variations, resulting in smoother operation and reduced torque ripple.

Applications

1）Low- to Medium-Speed Electric Motors: SPM rotors are widely used in applications where high torque density and efficiency are required, but the operating speeds are relatively moderate. Examples include industrial machinery and robotics.

2）Home Appliances: Common in motors for washing machines, refrigerators, and HVAC systems due to their cost-effectiveness and compact size.

Electric Vehicles (Entry-Level Models):

3）Used in cost-sensitive EV designs where performance requirements can be met without the need for more complex rotor designs.

4）Renewable Energy Systems: Applied in small-scale wind turbines or solar tracking systems, where simplicity and efficiency are priorities.

5）Pumps and Fans: Ideal for water pumps, air compressors, and ventilation systems, benefiting from their high efficiency and smooth operation at consistent speeds.

6）General Automation Systems: Utilized in conveyors, actuators, and other automation equipment where low-cost, high-reliability motors are needed.

These scenarios leverage the SPM rotor's simplicity, efficiency, and cost advantages, particularly in environments where high mechanical stresses are not a primary concern.