A gearmotor is basically a combination of a gear reducer and an ac or dc electric motor, with the gears and the motors combined into one unit. Most industrial gearmotors use ac motors, typically fixed-speed motors. However, dc motors can also be used as gearmotors, particularly in automotive applications.
Likewise, the gear reducers themselves can be different types such as helical, bevel gears or planetary types. And the physical configuration of gearmotors can differ as well including inline types, right angle, and shafted or hollow-shaft configurations.
In this installment of Motion Control Classroom, you’ll find resources covering the basics of gearmotors and gearmotor accessories, but also how to select the right gearmotor to meet your particular application’s requirements. You’ll also find information on gears and gearboxes, including gearbox service factor and service class.
You can find these and many more resources on motion control components and systems, including other MC Classroom installments, at www.designworldonline.com/mc2/.
Accessories for gearmotors are usually not the first thing most people look to when selecting a motor for an application. That’s because more important parameters like output torque, horsepower, and speed ratings usually (and rightfully so) take precedence.
What are shaft kits, face adapters, and mounting bases for gearmotors?
How do direct-drive (torque) motors compare to gearmotors?
Comparing gearmotors to direct-drive (torque) motors means comparing a number of metrics including efficiency and cost.
In some regards, the two are fairly comparable. Both gearmotors and direct-drive torque motors eliminate the need for other power transmission components between the motor and load that add compliance. This includes components such as belts and pulleys, chains and sprockets, and external gearing such as gearboxes.