Gearmotors are an essential tool for many drive systems. With unique designs and configurations available, gearmotors can be used to increase torque, reduce speed, reverse direction, or change the push or pull of a driveshaft. For over 80 years, Sumitomo Drive Technologies has been providing world-class gearmotors, gearboxes, and speed reducers, featuring industry-leading technology with fully integrated premium efficient motors. Our impactful power transmission units come in various shaft configurations such as right angle, concentric and inline.

Do you want something quick and powerful? A Sumitomo gearmotor is the way to go.

Our Best Selling Gearmotors

Why Sumitomo Gearmotors?

To power your operation, Sumitomo provides a comprehensive lineup of products with the gear ratios, torque, and horsepower you need. All of our premier products are available from our manufacturing facilities in Virginia, Illinois, Texas, and California. Our engineers will be able to craft a custom solution to match your design specifications if none of our stock products fit your needs.

Sumitomo gearmotors and speed reducers go beyond just the nameplate ratings. With us, you get peace of mind. It doesn't matter if you are designing a new machine or simply upgrading an existing one, you can depend on our team to provide you with a power transmission solution that will be efficient, convenient, and trouble-free for many years to come. Our high-performance gearmotors are designed for equipment where downtime is not an option. For repairs, our Aftermarket team is here to help. Gearbox problems are our expertise. Our technicians have extensive industry experience. For maximum gearbox life, we offer both standard and customized services.

Gearmotor FAQs

There are many types of gearmotors to choose from when you're in the market to repair or replace an existing unit or install a new gear motor. Sumitomo has option that can fit into your application with ease. To help save you time and hours of research, we've compiled a list of Frequently Asked Questions.

What is a gearmotor?

Gearmotors are made up of a motor, gear, and bearings enclosed in a housing. They are frequently used in applications that require a high amount of force (torque) at low speeds. A gearmotor powered by AC current performs many tasks related to high power, such as lifting, jacking, and robotics. Brackets, covers, and extension cables are used to mount, protect, and power gearmotors.


How does a gearmotor work?

The primary function within a gearmotor is handled by the gear unit and its stages. These features transfer the force of the motor from its input to its output. As a result, the gear unit functions as a speed and torque converter.

Gear units typically slow down motor rotational speeds while transmitting greater torques than an electric motor can provide by itself in most applications. Considering this, the design of the gear unit will determine whether a gearmotor is suitable for light or medium loads and for short or long power-applied hours.

Reduction ratios or gear ratios refer to how a gear unit steps down or steps up the motor's incoming speed (known as the input speed). Another measure of a gearmotor's performance is the maximum torque it has on the output side. Torque is measured in newton meters (Nm) and it refers to the force of the gear motor and the load that it can move with that force.


What types of gearmotors are available?

The primary factor in determining the type of gearmotor is the shaft configuration of the gear unit. We offer three different designs such as right-angle gearmotors, parallel-shaft gearmotors, and concentric units.


Where are gearmotors used?

The easy answer is--EVERYWHERE! Sumitomo units can be found in the parcel handling industry, mining industry, food & beverage industry and more. Anything that needs to be moved-- 9/10 is powered by some type of gearmotor.



What are the standard Cyclo input speeds?

In general terms, the speeds are 1750 and 1165 RPM. The selection tables in our catalog are based on 1750, 1165, 870, 580, and 50 RPM. When non-standard input speeds are used, the kilowatt (or horsepower) and torque ratings also vary.

My application has severe operating conditions. Can a Sumitomo gearmotor handle that?

The standard ratings for Cyclo® BBB4 are based on 10-hour daily service under conditions of uniform loads (equivalent to AGMA service factor 1.0). By following the product selection process outlined in our catalog, you will determine and apply the Service Factors to compensate for the severe operating conditions.

What information do I need to select the right gearmotor?

To select the proper gearmotor for your application, you need to know: 

  • Application: type of driven machine 
  • Hours of operation per day 
  • Motor horsepower (HP) and speed (RPM) 
  • Mounting position 
  • Ambient environment, temperature and humidity 
  • Special environment factors or operational requirements.

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