Things to note when choosing a stepper motor model

When choosing the model of a stepper motor, you can follow the steps below to avoid the trouble caused by improper selection. Details below are for reference only.

1. Selection of stepper motor torque

The holding torque of a stepper motor is similar to what is called "power" of a conventional motor. Of course, there are also essential differences. The physical structure of stepper motors is completely different from AC and DC motors, and the output power of the motor is variable. Which type of motor is usually chosen based on the required torque (that is, the torque of the object being driven). Roughly speaking, if the torque is below 0.8N.m, choose 20, 28, 35, 39, 42 (diameter or right angle of the motor body, unit: mm); if the torque is around 1N.m, it is more appropriate to choose a 57 motor. When the torque is above a few N.m, you need to choose a stepper motor with specifications such as 86, 110, and 130.

2. Selection of stepper motor speed

Special consideration should also be given to the speed of the motor. Because the output torque of the motor is inversely proportional to the speed. In other words, the stepper motor has a small torque when rotating at low speed (a few hundred revolutions per minute or lower, the output torque is large) and at high speed (1000 rpm-9000 rpm). Of course, some working conditions require high-speed motors, so the coil resistance, inductance and other indicators of the stepper motor need to be measured. Choose a motor with a slightly smaller inductance. As a high-speed motor, you can get a larger output torque. On the contrary, when low speed and high torque are required, it is best to choose an inductor with an inductance of ten or tens of mH and a larger resistance.

3. Selection of no-load starting frequency of stepper motor

The no-load starting frequency of a stepper motor is often called the "no-load frequency". This is an important indicator when purchasing a motor. If frequent instantaneous starts and stops are required and the speed is around 1,000 rpm (or higher), "accelerated start" is usually required. If direct start is required to achieve high-speed operation, it is best to choose a reactive or permanent magnet motor. The "idle frequency" of these motors is relatively high.

4. Phase selection of stepper motor

Many customers rarely pay attention to the selection of the number of phases of stepper motors, and most of them buy them casually. In fact, motors with different phases have different working effects. The greater the number of phases, the smaller the step angle and the smaller the vibration during operation. In most cases, two-phase motors are more often used. In a high-speed and high-torque working environment, it is more practical to choose a three-phase stepper motor.

5. Select according to the usage environment of the stepper motor.

Special stepper motors are waterproof and oil-proof and are used in some special occasions. For example, underwater robots need water discharge motors. For special-purpose motors, targeted selection is required.

6. Do you need special specifications according to your actual situation?

For stepper motors with special specifications, please communicate with us and we will process and order them within the technical scope. For example, the diameter, length and direction of extension of the shaft.

7. If necessary, it is best to further communicate with the manufacturer's technical engineer to confirm the model.

If necessary, it is best to further communicate with the manufacturer's technical engineers to confirm whether the stepper motor model you want to choose can meet all the indicators you require.

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