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Permanent Magnet DC (PMDC) motors commonly utilize various types of gears to achieve desired torque and speed characteristics. Gears are used to adapt the motor’s output to the required operation. Here are the primary types of gears used in or with PMDC motors:
1. Spur Gears: The most common type of gears, featuring straight teeth and mounted on parallel shafts. They are known for their simplicity and efficiency in transferring motion and power between parallel shafts.
2. Helical Gears: These gears have teeth that are cut at an angle to the face of the gear. This design allows for smoother and quieter operation compared to spur gears, making them suitable for applications requiring minimal noise.
3. Worm Gears: Consisting of a worm (which resembles a screw) and a worm wheel (which resembles a conventional gear). Worm gears are used to achieve high torque reduction between non-parallel, non-intersecting shafts. They are often used in compact PMDC motor applications due to their high torque output and space efficiency.
4. Bevel Gears: Used for shafts from the main shaft to the back shaft. They have conical shaped teeth and are typically mounted on shafts that intersect at an angle, usually 90 degrees. Bevel gears are used in PMDC motors for applications where the direction of the drive needs to be changed.
5. Planetary Gears: This system consists of multiple gears (planet gears) that rotate