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Welcome to 4QD – Electric Motor Control

We manufacture a range of  motor speed controllers and accessories for DC battery powered electric motors that are tough, reliable, and easy to use. We can provide motor control solutions for almost anything with a battery and an electric motor.

Our passion is getting stuff working – from model locomotives, golf carts, boats, and robots; to industrial machines and DIY projects.

  • Our controller range covers 0 to 300 Amps, 12 to 60 Volts, and can be used in a wide variety of applications using PM electric motors.
  • Many of our original controllers are still going strong after 20 years.
  • We provide the support you need to get your project up and running.
  • As well as our range of DC motor controllers and accessories, 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?
  • We enjoy talking to customers about their applications and would like to hear from you if you have a special project or ideas for new products.
  • All our controllers are made in the UK.

If you need help in choosing a controller then start on this page.

If you want to browse our range then our controllers are here, and our accessories are here.