Motor Base

Motor bases work as mounts for electric motors. The gadgets are installed with adjustable bolt patterns suitable for different-sized motors that enable necessary position adjustments to the motor. Most bases fit NEMA motor sizes.

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


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

Fixed-placement adjustable bases: These adjust via manual alteration of the guts distance that separates a driver and driven pulleys. They enable pushing or pulling a motor into place to install or change 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 is attained. The installation bolts are then tightened to full the process.

Base design ranges from simple, one-piece, formed plates to more technical models featuring Z-pubs with continuous welding to boost strength. Select versions correspond to NEMA mounting dimensions. Fixed-position bases are preferred due to low initial costs.

The equipment is further divided into the following classifications:

Single-screw adjustable base possesses a central screw for tension positioning. As the screw turns, the engine movements with the pulley middle towards or away from the center of the driven pulley. The operational simplicity provided by this device provides a reasonably-priced option for several applications.

Dual-screw positioning base offers two adjustable screws positioned beneath the motor feet. Its configuration matches single-screw systems but with reinforced building for extending the application range. In comparison with the single-screw style, this type of setup supports greater flexibility in shaft alignment and dual screws give a robust approach to maintaining alignment.

Specialized fixed-position bases feature installation studs extending from slots. While performing stress modifications the nuts are loosened and the electric motor is usually lifted above the studs. If the nuts are loosened a lot more than was necessary, the motor will change and shift closer to the driven pulley during the tightening process. Consequently the tension will exceed the mandatory level and the mounting studs will encounter excessive stress when tightening the nuts.

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

Types of tension-controlling products comprise:

Pivot bases depend on a motor’s weight along using its direction of rotation for applying and controlling stress. The motor is installed on pivoting hands and is held in place with bolt holes and slot machines configured to match the frame. The strain in the belt improves with the length of the engine from the pivoting shaft. Once started, the motor’s reaction torque extends the pulley’s center distance and builds tension by directing the pivoted arm downward. The arms move upward to decrease the center range as the operating load increases.

Spring-loading bases employ built-in springs to control belt strain. This unit features a motor positioned on cross members connected to tubes. The produced carriage shifts towards or away from a powered member in response to fluctuating load. The engine is definitely bolted to the free-moving carriage. When the adjustment screw can be switched clockwise, the follower nut, spring, and carriage move around in the direction opposing to the driven pulley. After installing 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.

Heavy duty and custom-built bases serve specific purposes and applications. Heavy-duty versions comprise reinforced construction and heavier components to handle additional stress. Unique gussets along with cross braces are sometimes found in these units.


Fixed-placement mechanisms are selected due to their cost advantage over more costly tension-controlling equipment. They are available in designs that are standard to NEMA mounting dimensions and provide sufficient belt tension control. Nevertheless, such configurations have certain drawbacks, including:

Without a movable plate for mounting, system alignment is performed when it is not really operating. This entails a certain quantity of guesswork and is certainly less optimal than making changes in dynamic mode.
When the electric motor is secured constantly in place and the belt aligned, pulley middle distance is locked in. If belt tension isn’t adequate to operate a Transmission Chain vehicle a maximum load without slippage, stress can result in extra wear of parts.
This kind of structures face difficulty in dealing with load fluctuations and shock or vibrations.
Tension-controlling bases are more efficient to install and operate. They cope better with circumstances concerning variation in weight. These units contain 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 execute changes and can mount motors vertically or horizontally.
If you want to know more about the motor base, please contact us for more information.


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China Sprocket Co., Ltd.

Mail: [email protected]

As one of leading manufacturers, suppliers and exporters of mechanical products in China, We offer reducers, sprockets, industrial and conveyor chain, belts, pulleys, gears, racks, gearboxes, motors, PTO Shafts, taper lock Bushing, vacuum Pumps, screw air compressors and many other products. Please contact us for details.

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Ever-power Sprocket Co., Ltd.

Tel: +86-571-88220653/88220971
Fax: +86-571-88220651

Mail: [email protected]

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As one of leading manufacturers, suppliers and exporters of mechanical products in China, We offer reducers, sprockets, industrial and conveyor chain, belts, pulleys, gears, racks, gearboxes, motors, PTO Shafts, taper lock Bushing, vacuum Pumps, screw air compressors and many other products. Please contact us for details.

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