How to choose the right stepper motor

  1. The physical structure of stepper motor is completely different from AC and DC motors, and the output power of the motor is variable. Which type of motor is usually selected according to the required torque. Roughly speaking, if the torque is below 0.8N.m, choose 20, 28, 35, 39, 42 (the diameter or squareness of the motor’s body, unit: mm); if the torque is about 1N.m, it is more appropriate to choose 57 motor. When the torque is several N.m or more, it is necessary to choose 86, 110, 130 and other specifications of stepping motors.

  2. When choosing stepper motor, you also need to consider the speed of the motor. Because the output torque of the motor is inversely proportional to the speed.

  3. Regarding the selection of the number of phases of the stepper motor. The more phases, the smaller the step angle and the smaller the vibration during work. In most cases, two-phase motors are used more often. In the high-speed and high-torque working environment, it is more practical to choose a three-phase stepper motor.

  4. If necessary, it is best to further communicate and confirm the model with the manufacturer’s technical engineer

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I just bought 3N.m 5A 2 Phase Nema23 Closed Loop Stepper Motor.

  1. Determining the drive mechanism component
    Determine the mechanism and required specifications. First, determine certain features of the design, such as mechanism, rough dimensions, distances moved, and positioning period.

  2. Calculate the required resolution
    Find the resolution the motor requires. From the required resolution, determine whether a motor only or a geared motor is to be used. However, by using the microstepping technology, meeting the required resolution becomes very easy.

  3. Determine the operating pattern
    Determine the operating pattern that fulfills the required specifications. Find the acceleration (deceleration) period and operating pulse speed in order to calculate the acceleration torque.

  4. Calculate the required torque
    Calculate the load torque and acceleration torque and find the required torque demanded by the motor.

  5. Select the motor
    Make a provisional selection of a motor based on the required torque. Determine the motor to be used from the speed-torque characteristics.

  6. Check the selected motor
    Confirm the acceleration/deceleration rate and inertia ratio.