Stepper Motor Market Analysis: Expected to Reach $2.4 Billion in 2028

Published Date: 2022-09-05
There are many structural forms and classification methods of stepping motors. Generally, they are divided into three types: reluctance type, permanent magnet type and mixed magnetic type according to the excitation method; according to the number of phases, they can be divided into single-phase, two-phase, three-phase and multi-phase forms. .

Among the stepping motors used in my country, reactive stepping motors are the main ones. The operating performance of the stepping motor is closely related to the control method. From the perspective of its control method, the stepping motor control system can be divided into the following three categories: open-loop control system, closed-loop control system, and semi-closed-loop control system. Semi-closed-loop control systems are generally classified as open-loop or closed-loop systems in practical applications.

The stepper motor subdivision drive technology is a drive technology developed in the mid-1990s that can significantly improve the comprehensive performance of the stepper motor. In 2008, American scholars proposed the control method of step angle subdivision of stepper motor for the first time at the annual meeting of incremental motion control systems and devices in the United States. In the following twenty years, the stepper motor subdivision drive has been greatly developed. Gradually developed to full maturity in the 1990s. The research on subdivision drive technology in our country is almost the same as that in foreign countries.

As a special motor for control, a stepper motor cannot be directly connected to a DC or AC power source to work, and a dedicated drive power supply (stepper motor driver) must be used. Before the development of microelectronics technology, especially computer technology, the controller (pulse signal generator) was completely realized by hardware, and the control system used separate components or integrated circuits to form a control loop, which was not only complicated to debug and install, but also consumed a lot of components. After finalization, the circuit must be redesigned to change the control scheme. This makes it necessary to develop different drivers for different motors. The development difficulty and development cost are high, and the control is difficult, which limits the promotion of stepper motors.

Since a stepping motor is a device that converts electrical pulses into discrete mechanical motion, it has good data control characteristics. Therefore, a computer has become an ideal driving source for stepping motors. With the development of microelectronics and computer technology, software and hardware The combined control method has become the mainstream, that is, the control pulse is generated by the program to drive the hardware circuit. The single-chip microcomputer controls the stepper motor through software, which better taps the potential of the motor. Therefore, it has become an inevitable trend to control the stepping motor with a single-chip microcomputer, and it is also in line with the trend of digitalization.

According to QYResearch, the stepper motor is limited by its own manufacturing process, such as the size of the step angle is determined by the number of rotor teeth and the number of running beats, but the number of rotor teeth and the number of running beats are limited, so the step size of the stepping motor is limited. The pitch angle is generally large and fixed, the stepper has low resolution, lacks flexibility, vibrates at low frequencies, and is noisy compared to other micromotors, making the physical device prone to fatigue or damage. These shortcomings make the stepper motor can only be used in some occasions with lower requirements. For occasions with higher requirements, only closed-loop control can be adopted, which increases the complexity of the system. These shortcomings seriously limit the stepper motor as an excellent open-loop control. Efficient use of control components. The subdivision drive technology effectively overcomes these shortcomings to a certain extent.

In the mid-1990s, it developed greatly. Mainly used in industry, aerospace, robotics, precision measurement and other fields, such as photoelectric theodolites for tracking satellites, military instruments, communications and radars, etc. The wide application of subdivision drive technology makes the number of phases of the motor not limited by the step angle , which brings convenience to product design. At present, in the subdivision drive technology of stepper motor, chopper constant current drive, pulse width modulation drive, current vector constant amplitude and uniform rotation drive control are adopted, which greatly improves the running accuracy of the stepper motor and makes the stepper motor in the middle , The field of low-power applications develops in the direction of high speed and precision.