AC Motor Repair
We Sell, Repair and Install all types of AC Motors!
At Precision Electric we start our repair by examining the six areas that contribute to the fault of the motor!
1. Stator Windings
2. Rotor Flux Capacity
3. Air Gap Measurement
4. Lead condition and Connection
5. Insulation Integrity
6. Mechanical (Bearing Fits and Surfaces, Rotor Balance )
With Our Twin 20 Ton cranes over our mechanical area, we are sure to lift even the biggest of motors safely!
Our State of the art, computer controlled test Panel can quickly diagnose the motor problem on the initial test run. Eliminating the guess work!
Our Core loss tester is capable of evaluating the core before putting a winding back in it. This eliminates putting a winding back in a bad core!
Our Computer controlled Burn out oven keeps the core below the temperature that starts the precess of changing the properties in the lamination iron. If the core gets too hot the Iron will never make a good magnet again and will not function as an efficient motor.
After the old winding is removed we install the highest quality materials in the new winding. We can eliminate the extra leads making the motor a set voltage. this helps in the connecting of the motor and helps eliminate incorrect wiring of the connection.
After the winding have been installed there are 3 epoxy technique used to encapsulate the winding. They are Dip & Bake, Pour On varnish and the V.P.I. method.
The Dip & Bake process is done by dipping the wound stator in the resin for an amount of time long enough to let the resin penetrate the cavities and pores in the windings and eliminating the air pockets. Then the winding is place in out computer controlled curing oven to complete the process. After the baking cycle the excess resin is removed and the stator is sent to be assembled.
The Pour on process is done by getting the winding warm and pouring on a two part epoxy. This eliminates the need for a baking cycle. after the epoxy cures the windings the excess resin is cleaned and the winding is sent to be assembled.
The V.P.I. process Is the best method and also the most time consuming. After the windings are installed the wound stator is put into a large tank and the tank is sealed. Then vacuum is applied to the tank. after the tank reaches a set vacuum the resin is introduced. The stator is held in this vacuum sealed tank until the resin penetrates all of the windings. after the windings have been impregnated the pressure is applied and the resin is forced out of the tank. the windings are removed and the the stator is sent to the bake out oven to complete the process. after the windings have been baked and the resin is cured the excess resin is removed and the stator is sent to be assembled.
While the winding process is being completed the mechanical portion of the repair is taking place. After the motor has been disassembled the bearing fits and surfaces are measured and compared to the Industry standards and if the surface or fit need to be repaired it is sent to be machined.
After the machine work is complete the rotor is test balanced and brought to meet the industry standards for rotating equipment.
After the motor is assemble using the highest quality bearings and seal in the industry, it is sent to be tested at the test panel again. We can attach the bearing temperature as well as the vibration probes to give us more data. If our customer requests a copy of the test data, one can be provided to them with every repair.
After our repairs meet the testing standards tit is sent to be painted with an epoxy paint and the shaft will be protected with a coat of rust inhibiting film.
Phoenix Shop Equipment
We Invite all of our customers to come tour Our 24,000 Square Foot Repair Facility!
We have the State of the art Testing Equipment and we can provide you with a repair that will perform!
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DC Motor Repair
We Repair All Types and Sizes of DC Motors!
Pump Repair
We Sell, Service and Repair All Types of Pumps!
We Can Also Laser Align your Motor to Your Pump
Gear Motor Repair
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At Precision Electric We Sell Service And Repair All Types and Sizes of Gear Motors!
Our extensive service/repair capabilities will help you reduce down time - 24 hours a day, seven days a week.
Our Gearbox services include:
- Rebuild Motors and Gearboxes
- On-site Removal/Installation
- Preventative Maintenance Services
- Factory Authorized Warranty Service for many manufacturers, including:
- U.S Electrical Motors/Emerson
- Lincoln Motors
- Leeson Motors
- Baldor Motors
- Marathon
- Magnatek
- Toshiba
- Stearns
- A.O. Smith
- Leroy Somers
- And Many Others
- Quick Turnaround Available 24 hours a Day
- Parts & Labor Warranty on all Rewinds
- Ship Small Motors UPS For Repair Units Less than 100 lbs
Generator Repair
At Precision Electric's our generator repair center we provide our customers with the industry's most experienced mechanics and technicians, adhering and complying with manufacturer and industry specifications. This assures that our customers that every repair is a quality repair and also demonstrates that Precision Electric's prides itself on our quick service! We use O.E.M. generator parts to ensure reliability and performance in all serviced and repaired generators.
General Repair Information
Basic Generator Repair:
Precision Electric's refurbishment of your motor includes disassembly, inspection of all windings and component parts, cleaning, re-varnishing, and re-assembly. The most important part of the recondition service is the incoming inspection and evaluation of the condition of the insulation and associated component parts of the motor.
Expertise and proper handling are essential for effective cleaning of insulation. Use of the wrong solvents or over aggressive cleaning can damage the winding. Whether we vacuum, steam clean, power wash, solvent clean or cryogenically clean your motor, Precision Electric uses the best method to guarantee the extended life of your motor.
Armature Rewind
Precision Electric's quality armature rewinds are designed for your specific application to provide long term protection for your motors and generators. Fast turnaround and Precision Electric's insulation system maximize uptime while reducing your maintenance costs.
General Workscope:
- Receive armature, visually inspect and photograph.
- Thoroughly clean and inspect all components.
- Perform micrometer check sleeve bearing bores for proper diametrical clearance and record measurements (if applicable).
- Perform micrometer check of shaft journal areas, coupling fit area, all shaft seal fit areas and record measurements.
- Perform micrometer check of coupling bore (if applicable).
- Dimensionally measure and record all seals, bearings and housings.
- Clean and inspect bearings and advise if replacement is necessary.
- Measure armature total indicated run-outs (TIR).
- Perform Megger Test on armature to check insulation integrity, and measure armature winding resistance.
- Perform bar-to-bar Surge Comparison Test on the armature windings.
- Test core and evaluate condition of iron laminations before stripping.
- Strip out old winding and insulation from armature.
- Test core and evaluate condition of iron laminations after stripping.
- Furnish and install new equalizer coils (if applicable).
- Rewind armature, using Factory coils and insulation.
- Perform Megger, Bar-to-Bar and Surge Comparison T ests on winding, prior to varnish treatment.
- Windings will be preheated, cooled to a specific temperature, varnish treated and baked.
- Machine commutator OD, undercut mica, scarf bar edges and deburr slots.
- Polish the commutator surface as required.
- Record the commutator TIR (profile comm.).
- Dynamically balance armature, as required.
- Perform Megger and Polarization Index Test on armature windings to insure insulation integrity.
- Measure armature bar-to-bar resistance.
- Prepare armature for shipment.
Field Frame Repair:
In the field frame, main and commutating field coils, compensating windings, and other elements are subject to failure from the rigors of environment and operating stress. Proper repair using upgraded insulation and an upgraded winding support system can reduce the impact of temperature, contamination, and vibration.
General Workscope:
- Receive field frame, visually inspect and photograph.
- Perform Megger Test to insure insulation integrity and measure coil winding resistance on the field frame.
- Perform AC Voltage Drop Test to check for shorted turns on the field frame windings.
- Check Pole Face Windings for insulation damage and looseness of bars (if applicable).
- Remove coil and pole assembly from the field frame.
- Remove coils from the pole pieces (i.e. strip out old winding).
- Reinsulate each pole and manufacture new collars (as required).
- Wind each pole with new copper wire using a wet wind process with U300 type epoxy.
- Cure each pole in a baking oven.
- Install and secure coil on pole piece.
- Clean all windings (field frame) with proven methods and materials to avoid damage to the insulation system.
- Oven bake the field frame to insure optimum dryness.
- Install coil and pole assembly in field frame and reconnect.
- Perform Megger Test, High Potential Test, AC Voltage Drop Test and Polarity Test on field windings.
- Install new field leads.
- Varnish and treat windings.
- Perform Megger Test on all windings.
- Perform AC Voltage Drop Test on shunt fields, comm fields and pole face windings (if applicable).
- Clean brush rigging / brush boxes as required, file out any high spots or burrs, if needed.
- Spray paint exterior and prepare field frame for shipment.
