Motor Base

Motor bases function 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 electric motor sizes.

The bottom regulates the pressure in a belt-driven system. That is critical for avoiding belt slippage and excessive strain that result in higher maintenance costs and additional downtime. Optimal belt pressure helps lengthen the provider lifetime of components, such as belts and electric motor bearings.


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

Fixed-placement adjustable bases: These adapt via manual alteration of the guts distance that separates a driver and driven pulleys. They enable pushing or pulling a electric motor into place to install or change the belt. Once the belt is pulled over the pulley, one or multiple screws force the motor away from the driven pulley until the desired tension level is certainly attained. The installation bolts are then tightened to total the process.

Base style ranges from simple, one-piece, formed plates to more complex models featuring Z-pubs with continuous welding to improve strength. Select versions correspond to NEMA mounting measurements. Fixed-position bases are favored because of low initial costs.

The gear is further divided in to the following classifications:

Single-screw adjustable bottom possesses a central screw for tension positioning. As the screw turns, the motor movements with the pulley middle towards or away 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 offers 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 type of setup supports better versatility in shaft alignment and dual screws give a robust approach to maintaining alignment.

Specialized fixed-position bases feature mounting studs extending from slots. While performing pressure adjustments the nuts are loosened and the engine is lifted above the studs. If the nuts are loosened a lot more than was required, the motor will turn and shift nearer to the powered pulley through the tightening process. As a result the tension will exceed the mandatory level and the mounting studs will experience excessive stress 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 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 mounted on pivoting hands and is held in place with bolt holes and slot machines configured to match the frame. Any risk of strain in the belt boosts with the distance of the motor 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 hands move upward to Conveyor Chain decrease the center range as the operating load increases.

Spring-loading bases utilize built-in springs to control belt strain. This unit features a motor positioned on cross members connected to tubes. The shaped carriage shifts towards or away from a powered member in response to fluctuating load. The engine is usually bolted to the free-moving carriage. When the adjustment screw is definitely turned clockwise, the follower nut, spring, and carriage move in the direction reverse 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 once they have undergone rerating to accommodate older mounts.

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


Fixed-position mechanisms are selected because of their cost advantage over more costly tension-controlling equipment. They can be purchased in designs that are standard to NEMA mounting dimensions and provide adequate belt tension control. Nevertheless, such configurations have specific drawbacks, including:

Without a movable plate for mounting, system alignment is performed when it is not really operating. This entails a specific amount of guesswork and can be less optimal than making adjustments in dynamic mode.
When the electric motor is secured in position and the belt aligned, pulley middle distance is locked in. If belt tension isn’t adequate to operate a vehicle a maximum load without slippage, stress can lead to extra wear of components.
Such 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 situations concerning variation in weight. These units contain the advantage in scenarios where many alterations are required due to location and environment, or where unique mounting requirements can be found. They reduce the time to perform changes and can install motors vertically or horizontally.
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