PM Motor Engineering

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The permanent magnet motor, often referred to as a “canstock” or “tin can” motor, is a low cost, low inertia, and low resolution type of motor. Its typical step angles range from 3.75 degrees to 18 degrees, and it offers a position resolution on the order of +/- 10%. As its name suggests, a permanent magnet motor’s structure includes permanent magnets that demonstrate ferromagnetism with alternating north and south poles set in a straight, parallel line to the rotor shaft. The rotor is moved through the action of permanent magnets, providing increased magnetic flux intensity. This intensity results in improved torque characteristics for the permanent magnet motor as compared to the variable resistance step motor.

A permanent magnet motor is several times less expensive than a hybrid stepper motor. The permanent magnet motor provides a low-priced alternative to hybrid stepper motors in applications that require closed loop systems, less accuracy, and less torque.

Follow the permanent magnet motor engineering guide to learn more about how permanent magnets work and how a PM motor can help you create a high quality product within your budget.

  1. Outline
  2. Permanent Magnet Motor Construction
  3. Permanent Magnet Step Motors Custom Features & Options
  4. Selection of PM Motors
    1. Torque Requirements
    2. Resistance Value
    3. Temperature
    4. Magnet
    5. Coil Extension Method
    6. Gear, Pulley etc.
    7. Standard Parts.
    8. Standard Dimensions
    9. Drive Circuitry