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 electric motor speed control solutions for almost anything with a battery and a DC electric motor, all of the pictures throughout this site are using our controllers.

Our passion is getting stuff working – from model locomotives, golf carts, boats, and robots; to industrial machines, special effects, and all sorts of DIY projects. We love helping mechanics get the electrics working, here’s a sample of the sort of thing we’ve done.

• Our motor controller range covers 0 to 300 Amps, 12 to 60 Volts, and can be used in a wide variety of applications using permanent magnet electric motors.
• We can provide the support you need to get your project up and running.
• Our controllers are reliable, many are still going strong after 20 years.
• All our controllers are made in the UK.
• We will ship to any country.
• 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? and how is H-bridge switching done?
• 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.

For help choosing a controller click here

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