Motor speed control - 4QD - Electric Motor Control
motor control for model locomotives and industrial machines
motor control for electric boats and toy cars
motor control for greenpower cars and robot wars

Welcome to 4QD – Electric Motor Control

We manufacture a range of  DC motor speed controllers and accessories for battery powered electric motors that are tough, reliable, and easy to use.

Our passion is getting stuff working – for industrial machine applications as well as hobbyists.

We love helping mechanics get the electrics working, and can provide electric motor speed control solutions for almost anything with a battery and a DC electric motor, to see the sort of thing we’ve done have a look here,  or just browse around the site, all of the pictures throughout this site are using our controllers.

  • Our motor controller range covers 30 to 300 amps, 12 to 84 volts, and can be used in a wide variety of applications that use permanent magnet electric motors.
  • They are easy to wire up.
  • They are easy to adjust.
  • We enjoy providing any additional technical support you need to get your project up and running.
  • We have a range of additional heatsinks available, if you need a high power, water cooled PWM controller ours are some of the best value on the market.
  • Our controllers are reliable, many are still going strong after 20 years.
  • We will ship to any country.
  • We have an extensive knowledge base with lots of technical support, manuals, wiring diagrams and background information on a wide range of motor control topics e.g. what is PWM? and how is H-bridge switching done?
  • We love talking to customers about their applications and would like to hear from you if you have a special project or ideas for new products.
  • We can help with designing wiring looms for projects.
  • We can develop bespoke control products and software [depending on volume].

For help choosing a controller click here

Come and have a look… our controllers are here, and our accessories are here.

Or just pick up the phone, we’re on 01487 450520 and are happy to chat about your project.