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Stepping motor selection requires scientific calculation to select the appropriate motor. In addition to paying attention to flange size, phase number, motor length, shaft length, number of outgoing lines, we should also calculate the torque, current, etc. and confirm the matching driver.
Ⅰ.Selection of stepping motor torque
The holding torque of stepping motor is similar to the "power" of traditional motor. Of course, there are essential differences. The physical structure of stepping motor is completely different from AC and DC motor, and the output power of motor is variable. Usually, which type of motor is selected according to the required torque (that is, the torque of the object to be driven). For example, the torque is 0.6N M or less, choose 28, 35, 42 (the body diameter or squareness of the motor, unit: mm; if the torque is more than 0.6n.m, choose 57 motor is more appropriate. If the torque is a few N.m or more, choose 86, 110 and other specifications of stepping motor.
Ⅱ.Phase number selection of stepping motor
Many customers pay little attention to the selection of phase number of stepping motor, and most of them buy it casually. In fact, the working effect of motors with different phase numbers is different. The more the number of phases (commonly used are two-phase, three-phase and five phase), the smaller the step angle can be, and the vibration during operation is relatively small. In most cases, two-phase motors are often used. In the working environment of high speed and large torque, choose three-phase stepping motor.
Ⅲ.Selection of step 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 speed (hundreds of revolutions per minute or less, its output torque is large), and at high speed, the torque (1000 rpm --9000 RPM) is very small. Of course, some working conditions require high-speed motors, so it is necessary to measure the coil resistance, inductance and other indicators of stepping motors. Choosing a motor with a smaller inductance as a high-speed motor can obtain a larger output torque. On the contrary, when low speed and large torque are required, it is better to choose the inductance of more than ten or tens of MH and the resistance of larger.
Ⅳ.Selection of no-load starting frequency of stepping motor
The no-load starting frequency of stepping motor is usually called "empty starting frequency". This is a more important indicator for choosing motors. If it is required to start and stop frequently in an instant, and the speed is about 1000 rpm (or higher), it is usually necessary to "accelerate the start". If you need to start directly to achieve high-speed operation, it is best to choose reactive or permanent magnet motor. The "idling frequency" of these motors is relatively high.