Is The Linear Motor A Servo Motor

- Jul 19, 2018-

Is the linear motor a servo motor?


The servo motor is an engine that controls the operation of the mechanical components in the servo system, and is an auxiliary motor indirect transmission. 


The servo motor can control the speed and the position accuracy is very accurate.The voltage signal is converted to torque and speed to drive the control object. The servo motor rotor speed is controlled by the input signal and can be quickly reacted. In the automatic control system, it is used as an actuator, and it has the characteristics of small electromechanical time constant, high linearity, and starting voltage, which can convert the received electrical signal into angular displacement or angular velocity output on the motor shaft. Divided into DC and AC servo the main characteristics of the two categories of motivation are that when the signal voltage is zero, there is no rotation phenomenon, and the rotation speed decreases uniformly with the increase of the torque.


 Linear motors are a way to open a closed magnetic field the discharge magnetic field directly converts electrical energy into mechanical energy of linear motion without the need for any intermediate conversion mechanism transmission. The structure can be seen as cutting a rotating electric machine in a radial direction.And the circumference of the motor is formed into a straight line. Wherein the stator is equivalent to the primary of the linear motor, and the rotor is equivalent to the secondary of the linear motor, after the primary current is passed, between the primary and secondary a traveling wave magnetic field is generated in the air gap, and a driving force is generated by the traveling wave magnetic field and the secondary permanent magnet, thereby realizing linear motion of the moving part.


 In fact, linear motors are also a kind of servo motors.In theory, as long as there is a feedback system (linear motors usually with Hall or linear encoder feedback) should be the servo system. Therefore, servo motors should be divided into two categories in a broad sense: rotary servo and linear servo motor. 


Linear motor features: high dynamics, high rigidity. Compared with the traditional linear transmission structure (such as screw, electric cylinder), it is maintenance-free, but the cost is high. It should be used in some places where the system dynamics are very high and special environments, such as semiconductor production lines.


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