Tongmao linear motor and stepper motor performance PK, not so much a PK, might as well be more direct comparison of performance, linear motor is a closed-loop control system, and the stepper motor is an open-loop control system, and Modern digital control technology has an essential relationship.

       In the current domestic digital control system, the application of stepping motor is very wide. With the advent of all-digital AC servo systems, AC servo linear motors are also increasingly used in digital control systems. In order to adapt to the trend of digital control, most of the motion control system using stepper motor or digital AC servo linear motor as the implementation of the motor. Although both are similar in control (burst and direction signals), there is a large difference in performance and application. There are several aspects of the use of performance for comparison, namely:

1. Different control accuracy, linear motor can do ultra-high precision standards;

2. Low-frequency characteristics are different, low-frequency stepping motor prone to low-frequency vibration phenomenon, the vibration frequency and load conditions and drive performance, the vibration frequency is generally considered to be half the motor no-load take-off frequency; linear motor operation is very smooth, even at low speed When there will be no vibration phenomenon;

3. Overload capacity is different, the stepper motor generally does not have overload; linear servo motor has a strong overload capacity;

4 different frequency characteristics, the output torque of the stepper motor with the speed increase and decline, and will decline sharply at higher speeds, so the maximum operating speed is generally 300 ~ 600RPM. Linear motor is constant torque output, that is, its rated speed (usually 2000RPM or 3000RPM) less than the rated torque can be output above the rated speed for constant power output;

5. Different speed response performance, it takes 200 ~ 400 millisecond to accelerate the motor from standstill to work speed (usually several hundred revolutions per minute); with the high speed acceleration of the linear motor of Mao, the acceleration and deceleration process is short;

6. Different operating performance, stepper motor control for the open-loop control, the starting frequency is too high or excessive load prone to lost or stalling phenomenon, excessive speed at stop prone to overshoot phenomenon, so to ensure that Control accuracy, should deal with the rise and deceleration problems; linear motor drive system for the closed-loop control, the drive can be directly sampled encoder feedback signal motor, the internal structure of the position loop and speed loop, generally do not appear lost stepper motor step Or overshoot phenomenon, control performance is more reliable.

       In summary, linear motor systems outperform stepper motors in many performance aspects. However, some less demanding occasions are often used to do the implementation of the motor stepper motor. Therefore, the design of the control system should take into account control requirements, costs and other factors, the appropriate selection of motor control.
This article originates from Kunshan Tongmao Electronics Co., Ltd. (www.tmmotion.com) original company, please indicate the source.