(1) The stepping motor controls the frequency of the stator phase current through the input pulse from the drive circuit, which allows it to move at a low speed. When the motor is waiting for a command, the rotor remains stationary. However, during low-speed operation, the speed fluctuation can be quite significant. Switching to high-speed operation may reduce speed fluctuations, but this often results in insufficient torque. In other words, low speed causes torque instability, while high speed leads to inadequate torque output.
(2) A PM-type stepping motor with a small step (50 mm or less) typically has a step angle of 7.5 degrees. This type of motor may experience issues with position control accuracy, especially in applications requiring precise movement.
(3) The output shaft of the stepping motor directly drives the load. If the load has a large inertia, it can lead to insufficient acceleration torque, making it difficult for the motor to start or maintain motion effectively.
(4) At low speeds, there may be situations where high torque braking is required. This can put additional stress on the motor and affect its performance over time.
To address these challenges, it is recommended to use a gear reducer. The reducer used with a stepping motor should have minimal backlash, good impact resistance, and strong tooth surface durability to ensure smooth and reliable operation under varying loads and speeds.
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