Electric Motor Resource Center

What Are High-Torque, Low-Rpm Motors?

High-torque, low RPM-motors are also called high-torque, low-speed motors. They are designed to move heavy and large weights in a very slow, controlled manner.

They are often larger, heavy-duty motors and are used in a variety of industrial settings. With an increase in automation demands throughout many industries, high-torque, low-RPM motors are frequently in-demand and have been used in a wide range of applications. 

Why Are High-Torque, Low-Speed Motors Used?

High-torque, low-speed motors are used in electrical and automated systems that must move heavy and/or large loads. These motors are also utilized when a part must follow a specific track of motion and do so in a slow, predictable manner.

Because they can smoothly and safely move weighty objects, they are incorporated into elevator doors, emergency barriers, freight systems, cargo lifts, security gates, automated doors, and similar equipment. Whenever high power is required without the high speed of a conventional DC torque motor, a low-RPM, high-torque motor is an optimal choice. They are also used in many aerospace, marine, and similar settings. 

What Are The Advantages Of High-Torque, Low-Rpm Motors?

High-torque, low-RPM motors provide many unique advantages within industrial and infrastructure applications. Their primary advantage is their ability to control the movement of heavy and large objects in an easily controllable manner. This provides predictability, safety, and the ability to control loads in critical areas.

High-torque, low-RPM motors can be utilized throughout infrastructure without posing any danger to surroundings. They can also be used in many aerospace and marine applications, including aboard aircraft and ships.

Another main advantage of high-torque, low-speed motors is the lack of a gearbox. Because these motors are specifically designed to run at slow, consistent speeds, there is no need for an added device to maintain controlled operation.    

Where Do I Get Replacement High-Torque, Low-Rpm Motors?

When high-torque, low-speed motors are required for a replacement, the need is usually urgent, as these motors are essential to may large infrastructure and industrial systems. They cannot always be replaced directly from the manufacturer. Most large manufacturers of high-torque, low-RPM motors will only sell directly to OEMs.

There are smaller electric motor manufacturers and distributors that maintain a stock of low-RPM motors, which are available as single units. These can be sourced for repair, replacement, and maintenance purposes. Sometimes smaller manufacturers can improve on the designs of commercial off-the-shelf motors to ensure longer operational life and a more robust lifespan. This can be especially advantageous for motors used in critical systems, such as freight elevator door motors, hoist motors, industrial pumps, and more.   

What Type Of Motors Are Elevator Door Motors?

Elevator door motors are typically high-torque, low-RPM motors. They are used to control the opening and closing mechanisms of elevator doors and gates. High-power, low-speed motors are needed on freight elevator doors and other heavy industrial lifts. They are frequently brushless DC motors or three-phase AC induction motors.    

What Is A Torque Motor?

A torque motor is a DC motor that is specifically designed to output a stead torque at a high speed, even when the rotor is unable to turn. This type of operation helps to prevent damage to the motor if stalling occurs. Torque motors are used in reels on audio recorders and similar devices. They can also be used as actuators in direct drive systems.