What is a servo motors

Update:03 Feb 2021

Servo motor is an engine that controls the operation of mechanical components in a servo system. It is an auxiliary motor indirect speed change device. Servo motors are electro-mechanical converters that can continuously rotate. As the servo motor of the hydraulic valve controller, it belongs to the micro motor with very small power, and the permanent magnet DC servo motor and the parallel DC servo motor are the most commonly used.
The role of servo motor
The servo motor can control the speed and the position accuracy is very accurate.
Servo motor classification
DC servo motor and AC servo motor.
  The output speed of the DC servo motor is proportional to the input voltage, and can realize forward and reverse speed control. It has the advantages of large starting torque, wide speed adjustment range, good linearity of mechanical characteristics and adjustment characteristics, and convenient control. However, the wear and spark of the commutation brush will affect its service life. Brushless DC servo motors that have emerged in recent years have avoided brush friction and commutation interference, so they have high sensitivity, small dead zone, low noise, long life, and small interference to surrounding electronic equipment.

DC servo motors are divided into brush and brushless motors
   Brushed motor has low cost, simple structure, large starting torque, wide speed range, easy control, maintenance is required, but easy maintenance (changing carbon brushes), electromagnetic interference is generated, and environmental requirements are required. Therefore, it can be used in common industrial and civil occasions that are sensitive to cost.
   The brushless motor is small in size, light in weight, large in output, fast in response, high in speed, small in inertia, smooth in rotation and stable in torque. The control is complex and easy to realize intelligence. Its electronic commutation method is flexible, and it can be square wave or sine wave. The motor is maintenance-free, highly efficient, low operating temperature, low electromagnetic radiation, long life, and can be used in various environments.
   AC servo motors are also brushless motors, which are divided into synchronous and asynchronous motors. At present, synchronous motors are generally used in motion control. They have a large power range and can achieve great power. Large inertia, low maximum rotation speed, and rapid decrease as the power increases. Therefore, it is suitable for low-speed and smooth running applications.

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