Technical Blog

What is a Servo Motor?

Servo motors are brushless motors that are coupled with integrated feedback for closed-loop control. They are typically suited to systems requiring high speed, high precision and high acceleration.

Servo motors offer exceptional performance over traditional DC brushed motors as the motors are commutated using electronics rather than carbon brushes. There are various options available including brakes, multiple feedback devices and different IP ratings.

Incorporating a servo motor within your application can offer many benefits including:

  • Higher efficiency
  • Higher output power
  • Closed loop control
  • Torque control
  • Higher accuracy
  • Lower EMI emissions

How do Servo Motors work?

In a servo motor the rotor carries the permanent magnets and the fixed magnets are energised by electricity. This removes the need for the use of carbon brushes to transfer the electricity to the rotor. 

A servo drive is then required to commutate the system, using a feedback device to accurately monitor the position of the rotor. This in turn allows the servo drive to energise the electro-magnets in the correct sequence to make the motor turn. Our range of servo drives are compatible with most of our servo motors.

Servo Motor Applications

Servo motors are well suited to precision velocity and positioning applications, offering accurate control of speed, position and torque. They are also well suited to higher rpm and varying load applications due to the servo drives ability to monitor and maintain a constant speed/acceleration.

Servo motors have been used in the following applications designed and manufactured by Heason Technology:

  • Professional Motorsports Driver Simulator - We provided a six degree of freedom motion platform with over a metre of travel in surge and sway to a customer with extensive simulation expertise. Constructed from standard industrial actuators and coupled with an innovative welded aluminium frame, the resulting platform offered exceptional motion performance in a compact design less than 400mm in height.

  • Naval Gun Mount Servo Motors - We designed and developed a pair of custom servo motors for a very demanding application which called for accurate form, fit and function replacement for an existing, but obsolete, design. The servo motors within this application are an integral part of actuators that are deployed on the forward deck on modern naval vessels and subjected to extreme environments.

  • Missile Flight Simulator - This gantry is largely manufactured from custom carbon fibre sections. Two vertical travelling beams carry servo-driven payload tables each capable of sub-millimetre repeatability, whilst carrying a 25Kg payload with accelerations up to 1G and peak speed of 3.0 metres per second.

  • Overspeed Governor Test Rig - The platform was designed to accommodate straight forward mounting of the Overspeed Governor, to couple to the rotary actuator and the linear actuator and to run the Governor at the required speed in order to simulate the lift falling and deploy the safety mechanism. 

Servo Motors from Heason Technology

Our range of servo motors suit many different types of harsh environments including:

  • Wash-down environments for food and beverage industries
  • Explosion-proof environments found in oil and gas industries
  • Environments with extreme temperatures

Browse our full range of Servo Motors to see other options that we have available, or take a look through our motors product portfolio where you’ll find a huge variety of different sizes and package types.

If you would like to find out more information about our Servo Motors or would like some assistance with your application requirements, please contact us on +44 (0) 1403 792 300 or email sales@heason.com. Make sure you contact us to find the best option for you!

(Images used in this blog are courtesy of Kollmorgen)

Article published on: 12/12/2019