What parameters should be considered in the selection of stepper motors

1、 Selection of stepper motor torque. The holding torque of a stepper motor is similar to the power of a traditional motor. Of course, there are also essential differences. The physical structure of a stepper motor is completely different from that of an AC/DC motor, and the output power of the motor is variable. Usually, the type of motor is selected based on the required torque (i.e. the torque of the driven object). For example, if the torque is below 0.6NM, choose 28, 35, 42 (the diameter or squareness of the motor body, unit: mm; if the torque is greater than 0.6nm, choose 57 motor is more suitable. If the torque is several Newton meters or more, choose stepper motors of specifications such as 86, 110, etc.).

2、 Step motor phase selection. Many people pay little attention to the selection of the number of phases for stepper motors, and mostly buy them casually. In fact, the working effect of motors with different phases is different. The more phases there are (commonly used include two phases, three phases, and five phases), the smaller the step angle can be, and the lower the vibration during operation. In most cases, two-phase motors are often used. In a high-speed and high torque working environment, choose a three-phase stepper motor.

3、 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. That is to say, at low speeds (below a few hundred revolutions per minute, its output torque is very high), while at high speeds (1000 to 9000 revolutions per minute), the torque is very small. Of course, some working conditions require a high-speed motor, so it is necessary to measure the coil resistance, inductance, and other indicators of the stepper motor. Choosing a motor with a smaller inductance as a high-speed motor can achieve a larger output torque. On the contrary, when low speed and high torque are required, it is best to choose inductors with a capacity of tens or even tens of MH and larger resistors.

4、 Selection of no-load starting frequency for stepper motors. The no-load starting frequency of a stepper motor is commonly referred to as the "no-load starting frequency". This is a relatively important indicator for selecting motors. If it is required to start and stop frequently in an instant, and the speed is around 1000 rpm (or higher), it is usually necessary to accelerate the start. If it is necessary to start directly to achieve high-speed operation, it is best to choose reactive or permanent magnet motors. The idle frequency of these motors is relatively high.