Variable speed drives are designed to control AC motor speed and torque. They improve the efficiency of electric motors used in industrial applications. At Northern Industrial we have supplied new and refurbished automation parts for over 40 years, so have a wealth of experience working with variable speed drives of all ages. If the variable speed drive you need is no longer in production, or you are looking for a more cost-effective solution then we could have the part you are looking for. All refurbished parts are tested by our engineers and come with a 12 month warranty. Search for your variable speed drive here today.