What is the difference between servo motor and ordinary motor?

Servo motor and ordinary motor are electrical energy conversion or transmission of electromagnetic devices, the same role, but their structure, accessories, prices, applications, there are certain differences, in general, servo motor than ordinary motor structure is more complex, more expensive, mainly used for some high requirements of the equipment. The servo motor can be used as an ordinary motor, and the drive Settings can be adjusted, but it is generally not used because of the high cost of the servo motor and the trouble of maintenance. Let's take a look at the difference between servo motors and ordinary motors.

1, the ordinary motor speed have not its own feedback, usually can not achieve accurate control; The servo motor is positioned by pulse, which can form a pulse closed loop, so as to accurately control the rotation of the motor.

2, the structure of the servo motor is closed-loop feedback control, the need to use the servo driver; Ordinary motor structure is simple, do not need to use a special servo drive.

3, the servo motor needs to pass the sensor at the back of the motor and the encoder response speed, orientation or torque reference value to the supporting driver, and then the driver adjusts the drive current in real time according to the user specified value to control the motor rotation, and the general motor is directly driven by the inverter or voltage regulator and other equipment directly to drive the motor rotation, and will not dynamically adjust the external interference.

Simply put, the main difference between servo motors and ordinary motors is:

Servo motor positioning is more accurate, with feedback. Ordinary motor no, on the power to turn.

Now let's take a look at the difference between servo motors and ordinary motors in structure

The mechanical structure of the servo motor and the ordinary motor is similar in principle, and is composed of two parts: the stator and the rotor. Their main differences are mainly manifested in blade structure and drive circuit.

The servo motor is characterized by its direction of motion is proportional to the voltage between the power supply, and is usually composed of three parts: encoder, controller and servo motor. Encoder can provide higher resolution to ensure precision control; The controller is the "brain" that specifies the motor running direction, speed and torque, and is responsible for converting the control signal sent by the driver into the corresponding motor movement instructions. The driver provides the power supply, which is the device that connects the motor and the power supply, and can accurately deliver the required electrical energy to the motor according to the control signal.

Ordinary motor is only composed of the power supply part and the motor body, and the speed or torque of the motor can be further determined according to the size of the access voltage. Under normal circumstances, the ordinary motor uses an open loop, and the speed of operation depends on the size of the voltage, so the choice of the controller is not as important as the servo motor.

Article source: https://article-realm.com/article/Writing-Speaking/53927-What-is-the-difference-between-servo-motor-and-ordinary-motor.html