Brushed motors are low-cost, simple in structure, have high starting torque, wide speed range, and are easy to control. They require maintenance, but maintenance is convenient (replacing carbon brushes). They generate electromagnetic interference and are subject to environmental requirements. Therefore, they can be used in cost-sensitive general industrial and civilian applications. WEMA (Shanghai) Automation Technology Co., Ltd. is a linear module manufacturer integrating product agency distribution, product development, and technical services.
Brushless motors are small in size, lightweight, powerful, fast-responding, high-speed, low-inertia, smooth-rotating, and stable in torque. While their control is complex, they are easily made intelligent. Their electronic commutation is flexible, allowing for either square wave or sine wave commutation. The motors are maintenance-free, highly efficient, operate at low temperatures, have minimal electromagnetic radiation, and a long lifespan, making them suitable for various environments.
AC servo motors are also brushless motors, and they are divided into synchronous and asynchronous motors. Currently, synchronous motors are generally used in motion control because they have a wide power range and can achieve very high power. They have high inertia, high rotational speed, and their speed decreases rapidly as power increases. Therefore, they are suitable for low-speed, stable operation applications.
The following explanation is provided: Microstepping control of a stepper motor is achieved by the driver precisely controlling the phase current of the stepper motor. Taking a two-phase motor as an example, if the rated phase current of the motor is , and if a conventional driver (such as the commonly used constant current chopper method) is used to drive the motor, the current in its windings will change from to for each step the motor takes. The huge change in phase current will inevitably cause vibration and noise during motor operation.
If a microstepping driver is used, driving the motor in microstepping mode results in only a slight change in current in the windings for each microstep, and the current changes according to a sinusoidal curve. This significantly reduces motor vibration and noise; therefore, the performance advantage is the true benefit of microstepping. Because microstepping drivers require precise control of the motor's phase current, repairing stepper motor drivers demands a high level of technical expertise and process control, leading to higher costs.
Note that some domestic drivers use "smoothing" instead of "penetration," and some even call it "penetration," but this is not true peeling:
1. "Smoothing" does not precisely control the phase current of the motor; it only slows down the rate of change of the current. Therefore, "smoothing" does not generate microsteps, while finely divided microsteps can be used for precise positioning.
2. Smoothing the phase current of the motor will cause a decrease in the motor torque, while microstepping control will not only not cause a decrease in the motor torque, but will actually increase the torque.
WM (Shanghai) Automation Technology Co., Ltd. is a domestic servo motor manufacturer that integrates diversified businesses such as product agency and distribution, product development, and technical services.
