Do you know how to distinguish between AC variable frequency motor and AC servo motor? Dalan Motor takes everyone to study together!
1. The working principle of AC servo motor and inverter plus ordinary AC motor is basically the same. It belongs to AC-DC-AC voltage type motor driver, but the technical index requirements are quite different, so there is a big difference in motor and driver design. ;
2. Servo system is mainly used in applications such as fast tracking, ultra-wide speed range, precise positioning, ultra-low speed and large torque, such as precision CNC machine tools, high-speed packaging machines, high-end textiles, packaging and printing machinery, etc. The main technical indicators are: the transient torque should reach 2.5-3 times the rated torque, and the speed regulation range should exceed 1:2000-10000. The encoder must be used as the speed and position feedback. In order to ensure the parking positioning, the motor has its own Brake; servo motor has DC motor and AC motor, DC servo is actually a special DC motor, but the current application of AC permanent magnet synchronous motor has dominated; mainly based on small and medium power (several hundred watts - dozens of KW ), the excellent performance also brings the disadvantage of high price; so its application is affected; but with the gradual decline of the price of the servo system and the upgrade of the equipment, more and more servos will be applied to all walks of life; Look, the servo function is mainly: 1, speed control 2, torque control 3, position control (including positioning and tracking); from the control point of view, the servo is generally Ring system: outer position of the ring, the inner ring followed the speed loop and current loop.
3.
In fact, most devices in real-life applications do not require high control performance of the motor.
The speed range is generally:
1:100
(no encoder)
/1:1000(
With encoder), maximum torque:
1.5
The rated rating is sufficient; the technical difficulty, scheme, configuration and price of the motor and the drive are greatly reduced;
And the power range is wide, from a few hundred watts to thousands
KW
Not equal; as the application is in all walks of life, it changes
The
Frequency Converter is especially rich in functions. In order to meet the needs of specific industries, many manufacturers are developing industry specialties.
Type-type inverters are more typical: elevator-specific inverters, water supply-specific inverters, etc.; low price,
Wide coverage is the main feature of the inverter;
The motor can be an asynchronous motor.
It can also be a synchronous motor;
Generally, the inverter only includes two steps of speed control and current control;
3. In fact, most of the equipment in the actual application does not require high control performance of the motor. Compared with the servo: the speed range is generally 1:100 (no encoder) / 1:1000 (with encoder), maximum torque: 1.5 times rated; the technical difficulty, scheme and configuration, and price of the motor and driver are greatly reduced; and the power range is wide, ranging from several hundred watts to thousands of KW; due to the application in various industries, the inverter The function is particularly rich. In order to meet the needs of specific industries, many manufacturers are developing industry-specific inverters. Typical ones are: elevator-specific inverters, water supply-specific inverters, etc.; low price and wide coverage are the main features of the inverter. The motor can be an asynchronous motor or a synchronous motor; the general inverter only includes two steps of speed control and current control.
4. Servo motor, also known as the execution motor, is used as an actuator in the automatic control system to convert the received electrical signal into an angular displacement or angular velocity output on the motor shaft; it is divided into two major categories: DC and AC servo motors. Its main feature is that when the signal voltage is zero, there is no rotation phenomenon, and the rotation speed decreases uniformly with the increase of the torque.
5. The frequency conversion motor adopts the AC speed regulation mode of “special frequency induction induction motor + inverter”, which makes the mechanical automation degree and production efficiency greatly improve the miniaturization and increase the comfort of the equipment. It is currently replacing the traditional mechanical speed regulation and DC speed regulation. Program.
6. The technology of AC servo is the technology of borrowing and applying frequency conversion. It is realized by the PWM method of DC motor to simulate the control mode of DC motor on the basis of servo control of DC motor, that is to say, AC servo motor must have frequency conversion. This link.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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May 27, 2023