Motor bases function as mounts for electric motors. The devices are installed with adjustable bolt patterns ideal for different-sized motors that allow necessary position adjustments to the motor. Most bases fit NEMA engine sizes.

The base regulates the pressure in a belt-driven system. This is critical for staying away from belt slippage and excessive strain that lead to higher maintenance costs and additional downtime. Optimal belt pressure helps lengthen the assistance lifetime of components, such as for example belts and electric motor bearings.


Today’s marketplace features multiple types of motor bases with two principal categories, including:

Fixed-position adjustable bases: These change via manual alteration of the center range that separates a driver and driven pulleys. They enable pushing or pulling a engine into place to install or adapt the belt. Once the belt is stopped the pulley, one or multiple screws force the motor away from the driven pulley before desired tension level can be attained. The installation bolts are after that tightened to finish the process.

Base design ranges from simple, one-piece, formed plates to more complex models featuring Z-bars with continuous welding to boost strength. Select versions correspond to NEMA mounting sizes. Fixed-position bases are favored agricultural Chain because of low initial costs.

The gear is further broken down in to the following classifications:

Single-screw adjustable base possesses a central screw for tension positioning. As the screw turns, the electric motor movements with the pulley middle towards or from the guts of the powered pulley. The operational simplicity provided by this device provides a reasonably-priced option for many applications.

Dual-screw positioning base provides two adjustable screws placed beneath the motor feet. Its configuration fits single-screw systems but with reinforced construction for extending the application range. In comparison to the single-screw style, this kind of setup supports higher flexibility in shaft alignment and dual screws give a robust approach to maintaining alignment.

Specialized fixed-placement bases feature installation studs extending from slots. While performing stress changes the nuts are loosened and the motor can be lifted above the studs. If the nuts are loosened more than was necessary, the motor will turn and shift closer to the powered pulley through the tightening process. As a result the tension will exceed the required level and the installation studs will encounter excessive strain when tightening the nuts.

Tension-controlling bases: The structures integrate internal or external tools that automatically alter the guts distance of a pulley of a running engine in response to load condition requirements.

Types of tension-controlling products comprise:

Pivot bases rely on a motor’s weight along using its path of rotation for applying and controlling stress. The motor is installed on pivoting arms and is held set up with bolt holes and slot machines configured to match the frame. The strain in the belt boosts with the length of the electric motor from the pivoting shaft. Once began, the motor’s reaction torque extends the pulley’s center range and builds pressure by directing the pivoted arm downward. The hands move upward to decrease the center distance as the working load increases.

Spring-loading bases utilize built-in springs to control belt strain. This device features a motor added to cross members connected to tubes. The created carriage shifts towards or from a driven member in response to fluctuating load. The electric motor is definitely bolted to the free-moving carriage. When the adjustment screw is definitely turned clockwise, the follower nut, spring, and carriage move around in the direction opposing to the powered pulley. After setting up the belt, further rotation of the screw pushes the carriage to a spot where the belt is snug.

Conversion electric motor bases match newer, smaller motors after they have undergone rerating to accommodate older mounts.

Durable and custom-built bases serve specific purposes and applications. Heavy-duty variations comprise reinforced building and heavier materials to take care of additional stress. Particular gussets along with cross braces are sometimes found in these units.


Fixed-position mechanisms are selected due to their cost advantage more than more costly tension-controlling equipment. They are available in styles that are standard to NEMA mounting sizes and provide sufficient belt tension control. Nevertheless, such configurations have particular drawbacks, including:

Without a movable plate for mounting, system alignment is performed when it is not operating. This entails a particular quantity of guesswork and is certainly less optimal than making adjustments in dynamic mode.
When the electric motor is secured constantly in place and the belt aligned, pulley center distance is locked in. If belt tension is not adequate to drive a maximum load with no slippage, stress can result in extra wear of elements.
This kind of structures face difficulty in coping with load fluctuations and shock or vibrations.
Tension-controlling bases are more efficient to install and operate. They cope better with circumstances involving variation in weight. These units hold the benefit in scenarios where many alterations are needed due to location and environment, or where unique mounting requirements can be found. They decrease the time to perform changes and can attach motors vertically or horizontally.
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