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Disassembled Electric Motor

Motor Modifications

There are instances when your motor will need special accessories for protection from stray voltage, load and harsh environment. L&S Electric features the best motor modifications that suit your particular needs.

You can select from various options to extend the lifespan of your equipment including shaft grounding, installing flange kit, lead extension and incorporating space heaters.

Modifications

Photo of the various parts of an electric motorConduit Box Position

Generally, the conduit box is situated on the side of the motor, specifically on the area where the stator leads are connected to leads traveling to the power supply. NEMA or F1 motors are normally positioned on the left side when facing the motor's drive end while the IEC or B3 motors are found on the right side when facing the drive end. To facilitate quick access, the conduit box may be repositioned in a manner that you prefer to achieve maximum convenience.

Extended Leads

Medium to large motors typical have leads that extend from the winding and up to the terminal box. Extended leads may be provided in case the length of the leads do not suffice.

Flange Kit Installation

There are instances when installing an electric motor to the equipment required to operate may not be possible. In this case, a flange kit can offer the right conversion necessary for mounting the motor precisely and achieve excellent operation.

Resistance Temperature Detectors

A Resistance Temperature Detector (RTDs) measures the temperature as it compares the resistance of the RTD element with the temperature. This tool can sense the temperature in a precise manner, regardless of the industrial environment such as high-voltage equipment, generators, and motors. To achieve outstanding performance in various situations, these sensors are protected carefully from electrical noise. In fact, RTD elements consist of fine and coiled wire, which is wrapped around a ceramic or glass core placed inside a probe.

Shaft Grounding

Several benefits can be achieved with the help of variable frequency drives including a longer lifespan of the equipment and energy savings. It is important to note, though, that electrical discharges are often created because of variations in frequency. Once electrical discharge searches for a path to ground, bearings found in rotating equipment are at risk of damage and motor failure. 

With shaft grounding rings, damages on bearings caused by electrical charges can be prevented. Furthermore, carbon fibers found in grounding rings offer a safer path for electrical discharges to ground. Insulated bearings and insulated hub end shield placed in the non-drive end are other means of protecting motors from electrical charges.

Space Heaters

Space heaters maintain a winding temperature that ranges from 41 to 50 degrees Fahrenheit above the surrounding air temperature, which prevent condensation problems that occur in motors. Generally, space heaters may be useful in certain situations such as in motors run in environments with air humidity reaching to 95 percent, with the motor in idle for minimum of 24 hours. Another instance that requires space heaters is when there are motors that operate in an environment with over 95 percent relative air humidity, no matter how often the motor runs.

Flexible heaters are beneficial when there is insufficient clearance for a rigid strip heater. You can connect this type of heater to the external diameter of the varnished windings' end turns. Heaters may also be placed on both ends when the motor is quite large.

Surge Protection

High voltage surges are common with motors that come with high voltage. Among the common factors that cause massive voltage surges are variable frequency drives, lightning , and line faults. With the help of lightning arresters installed on ground wall insulation, high voltage surges can be prevented. As for turn-to-turn insulation, you can use surge capacitors that minimize wave-front slope. Tota surge protection, however, may be achieved with the combination of capacitors and arresters.


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