Servo motors are mostly used in high-precision control systems. They have a variety of intelligent control methods and a feedback system for closed-loop control. In the dynamometer, the dragging can be performed, and the servo motor further expands the control characteristics.
The dynamometer is mainly divided into two parts: the cabinet and the gantry, and the gantry mainly has the motor to be tested, the torque speed sensor and the mechanical load. Currently, servo motors are often used as loads. The servo motor converts electrical signals into torque and speed to drive the control object. The servo motor rotor speed is controlled by the input signal and can be quickly reacted. It is used as an actuator in the automatic control system and has characteristics such as small electromechanical time constant, high linearity, and starting voltage.
figure 1
The servo motor can be used for motor towing. The common DC bus adopts a separate rectification/return device to supply power to the system. The inverter for speed regulation is directly connected to the DC bus. When the system is working in the electric state, the inverter is from the inverter. When the load is reversed by the motor under test, the servo motor will become a generator, and the energy is directly fed back to the grid through the bus and the feedback device to achieve energy saving and improve the reliability of the equipment.
figure 2
Then the problem comes, and the servo motor variable frequency motor can also achieve the effect of this power feedback. In fact, this is the case. For frequency conversion motors, more attention is paid to frequency control. Variable frequency motors can meet the required speed requirements by changing the frequency of the motor according to the needs of the work. However, such variable frequency motors do not have better torque. Characteristics, it only overcomes the need for ordinary motors not to adapt to PWM wide-wave analog sinusoidal AC.
image 3
When measuring the load characteristics of the motor, the national standard requires that the test be carried out as quickly as possible to reduce the temperature change of the motor during the test. In comparison, the superiority of the servo motor is extremely high interpretation. The load change requires the load motor to respond quickly to a given waveform. It not only has the characteristics of high control precision, fast control speed, and built-in PID adjustment function, but also simulates the continuous operating condition change of the tested motor load. . A servo motor is recommended as the test load when the speed or torque is not particularly high or low.
As a drag load, the servo motor is free from the limitation that the traditional dynamometer can only be loaded one by one. In the industry, ZLG Zhiyuan Electronic MPT motor test platform is the original "free loading engine" technology, which realizes arbitrary load curve loading and waveform measurement during motor testing, which meets the requirements of transient measurement of motor and driver. Let motor testing take new heights.
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