Capabilities at a Glance
- Motor installation
- Laser alignment
- Dry ice cleaning
- Full diagnostic services
- Baker hi-pot testing
- Phenix core loss testing
- Megger testing
- Efficiency analysis
- Motor vibration analysis
- Vacuum pressure impregnation (VPI)
- Shaft voltage testing
- Documentation and trending
- Field balancing
- Critical motor storage and maintenance
- Annual motor preventative maintenance contracts
Vacuum Pressure Impregnation
All Brandon & Clark windings are processed using Vacuum Pressure Impregnation or VPI. VPI means that windings are processed under vacuum and pressure with solventless epoxy resin to provide void-free electrical windings. The VPI process provides maximum penetration of resin throughout the turns in insulation of individual coils.
VPI is designed specifically to provide complete and void free impregnation on dry-wound insulated form-wound stators to satisfy the requirements of IEEE specification for sealed systems. In addition to providing thorough impregnation, the solventless resin provides a smooth and continuous coating on the external surfaces of the wound coils. Through the VPI process it is also possible to produce random wound stators capable of passing IEEE specifications for sealed systems. Vacuum Pressure Impregnation is also suitable for impregnation of other electrical apparatus, i.e., field coils, lifting magnets, transformers, shaker coils, and retreatment of aged windings. The VPI process provides environmental and mechanical protection for your electrical apparatus that is equal to or better than several dips and bakes in conventional varnishes.
Phenix Core Loss Testing
Brandon & Clark performs Phenix Core loss testing and high frequency evaluations on all motors at 400hz for stater lamination evaluations. Phenix testing is also used to test for core iron damage before and after your motor is rewound. If your motor has core iron or lamination damage it can cause the motor to fail, consume more energy, or generate more heat. Heat in turn will reduce the reliability of your motor and its overall functional life. By having your motor Phenix tested with Brandon & Clark you are increasing your motors reliability, and reducing your overall operating and maintenance cost.
Shaft Voltage Testing
Why should I “shaft voltage test” my motor?
Shaft voltage testing identifies any voltages on the motor’s shaft that could potentially discharge through the bearings. High levels of discharge can cause damage to the bearings such as pitting and fluting which, then leads to bearing failure and shortened motor life.
What causes harmful shaft voltages?
With its ability to operate motors that can match its demand loads and alleviate electricity costs its no surprise the increased popularity of VFDs in the industry today. However, with its advancement, research shows that when utilizing VFDs, shaft voltages generated from the common-mode output is leading to arcing across the motor’s bearings. Other risk factors of shaft voltages are, motor frame size, mishandling or damage to the motor, and improper grounding.
How do I test to see if my motor has destructive shaft voltages?
When arching discharge occurs within the motor’s bearings, the first telltale sign is vibration and an increase in noise, however if you are hearing noise generated by the bearings, its too late, the damage has been done. Another sign is “frosting”, the microscopic pitting of the bearings, but to see this condition the motor must be disassembled.
Shaft voltage testing requires that the shaft of the motor be exposed and the motor energized thus creating an unsafe testing environment. To remedy this unsafe testing situation, Brandon and Clark has acquired the AEGIS® SVP Shaft Voltage Test Kit. With an oscilloscope, voltage monitor and this specially-designed shaft voltage probe, the operator’s reach is extended making contact to the motor shaft by means of a conductive microfiber™ brush and measurements are taken safely. Careful observation of the waveform and monitoring the voltage levels will reveal evidence of shaft voltage discharge. Conducting this test allows the customer and to make proactive decisions about the condition of the equipment.
Prevention & value added services from Brandon & Clark.
To safe guard against equipment failure and downtime, preventative maintenance is key. By allowing Brandon and Clark to routinely check the condition of your motor’s shaft voltages, we can identify issues before they become problems. We can also take additional efforts to protect your motor against these bearing issues, including replacing the standard bearings with either ceramic or insulated bearings and adding grounding brushes and grounding rings.
Brandon and Clark has a tool box full of other preventative maintenance testing capabilities that can identify and trend the health of your motor including: PdMA, vibration analysis, thermal imaging and laser alignment.
Brandon & Clark provides an electrical fingerprint for the motors that we repair. We provide this fingerprint by using testing equipment called PdMA (predictive maintenance assessment).
The motor fingerprint that is created allows for a baseline to be set for each motor which allows customers to be proactive and schedule repair and maintenance of their equipment on a preventative, predictive schedule instead of a failure schedule. Since the PdMA, MCE is equipped with the MCE GOLD motor management software, Brandon & Clark is able to keep and monitor the entire test history of our customer’s motor. The software also allows us to evaluate the data collected against the latest in acceptance criteria from IEEE and NEMA.
Using the PdMA equipment, Brandon & Clark, is able to assist our customers in predicting the maintenance required to prolong and protect the life of their equipment. This in turn helps our customers maintain control over their processes versus waiting for or hoping against equipment failure. PdMA also helps to control repair cost, by performing maintenance repairs versus catastrophic failure repairs.
All rotating equipment vibrates to some degree, the key is to monitor the equipment and take action before any serious damage can become an expensive problem. Vibration in electrical equipment can be caused by imbalances in the rotating parts, uneven friction, the meshing of gear teeth, bearing wear and a number of other causes.
Vibration analysis can detect the early warning signs of machine failure, allowing you to make the decision to repair or replace the equipment BEFORE an expensive failure and downtime occurs.
Vibration analysis can be applied to: motors, mechanical drives, pumps, gearboxes and compressors.
The proper alignment of coupled machinery is crucial to the performance and efficiency of that piece of equipment. Misaligned machinery are more likely to experience seal and bearing failure and excessive vibration all resulting in damage to the equipment, production loss and downtime. A misalignment can be detected during routine preventative maintenance such as vibration analysis.
Laser alignment can be applied to air compressors, pumps, motors, turbines, generators, gearboxes, fans, propeller shafts, conveyors and blowers.