This again will introduce bent shaft symptoms (see Figure 6.12F in Section 6.12 on "Electrical Vibration"). Consider contacting a specialist if the source of vibration cannot be easily identified. These problems, if present, may occur when the motor is operating at 60% to 70% of full load. 250 HP Fan Repair and Motor Rewind. A motor having high LRT, such as defined by the National Electrical Manufacturer's Association (NEMA) for Design C on small motors, or large motors with less exaggerated high torque curves, will normally have a large dip in torque in the 50-80% speed range. Performed as a detection of weakness and potential for failure within cable or wire insulation, high potential (hipot) testing, also known as dielectric strength testing, should be performed after . Fast turnaround. With our machine shop capabilities, electrical diagnostic equipment, and advanced EASA shop technicians, RMSC can effectively perform your electric motor repair of all sizes with the utmost expertise. One of the most common performance issues in electric motors is overheating. With so much at stake, your electric motor repair services contractor has to provide quality repair and outstanding customer service. When analyzing vibration we look at two components of the Electric Motors Inc. is a licensed electrical contractor located in Henderson, KY. Replace the fuse or reset the breaker. If the vibration remains after asking the 10 questions above, conduct a vibration troubleshooting analysis to find the exact source. Large capacity, 60 gallon ASME* air receiver with large 3/4" air outlet port. This twice line frequency vibration is transmitted through the motor frame to Our staff is very knowledgeable and friendly. Call our Electric Motor Service Department for more information at 631-342-1171. Unbalance rotor 1x rotor speed Radial Level drops slowly Rotor has unbalance - can be due to thermal problems Bent shaft 2x primary (1x may be seen) Axial Level drops slowly DE runout should give higher 2x axial at that end. The frequency of routine service varies widely between applications. Normal runout on core is 1-2 mils. To perform a cursory check of the bearings, place the motor on a solid surface and place one hand on the top of the motor, spin the shaft/rotor with the other hand. Replace the bad coupling; If there is a loose sheave, tighten the set screws or replace that component. Electric Motor Repair. Phase-to-ground 3. Jenkins Gen3 Motor Test Systems are designed with selectable voltage control and improved safety features. The company offers rewinding and complete remanufacturing, and various predictive maintenance services, including electronic balancing, vibration analysis, laser alignment, and efficiency testing. Colin Electric Motor Service offers sales, service and remanufacturing of electric motors, and sales of all related controls and equipment. As the torque is produced, the rotor begins to speed up. 1. Electric Motor and Pump Repair Facility in Toronto Since 1973, We are CSA Certified as a Repair Facility for Electrical Motors and Generators for Use in Hazardous Locations. Located at 2400 Taneytown Rd. A problem may also be developing if the 2 X line frequency (7,200 cpm amplitude) exceeds the previous guidelines. Problems in a motor such as a rub, loose parts, a bent shaft extension, or elliptical bearing jour-nals can cause vibration at 2 rotational frequency. Vibration can cause damage in several ways. If the noise is due to something in the motor design (e.g., a manufacturing defect or anomaly), a . 3 feet are centered on the base for increased stability. If vibration still occurs, check for signs of wear, as well as misalignment or loose bearings. mechanical looseness. Excessive friction, usually from misalignment or vibration; Electrical problems, typically voltage unbalance . Available 24/7 877-249-1701 Customer Portal . rotor friction. This is because it can lead to failure of windings or metal fatigue of parts. Data collected by vibration sensors can be analyzed to . Had to send bike back at my cost for warranty replacement. We offer an extensive range of AC/DC electric motor repair services. Vibration Dynamics is an electric motor repair shop in Conroe, TX, with years of experience serving the community with the best parts available. Common problems with commutators and brushes include threading, grooving, copper drag, and flashover. 7 running HP. A motor vibration analysis is one of the best predictive maintenance tests an electric motor shop can provide for the following reasons: . 4. Also, each mechanical problem or defect generates vibration in its own unique way. ELECTRICAL OVERLOADS: An electrical failure of a winding or connection in the motor can cause other Windings or the entire motor to overheat. Electric motors as the prime movers in all industry sectors . After this, your fireplace remote receiver will be synchronized with the transmitter. Data collected by vibration sensors can be analyzed to . Olathe, KS 66062. Tracking degrades the winding insulation which makes the problem worse over time, and may eventually result in a need to rewind the motor completely. Basic frequency analysis. Two types of vibration can trouble your clutch or brake. Electric Motor Shop (Wake Forest) 1225 North White Street Wake Forest, NC 27587 (800) 444-3229 Toll Free (919) 556-3229 Phone We are recognized internationally as an industry leader in electric motor repair, rewinding and load testing; employing a staff of over 100 dedicated professionals whose expertise is on call 24 hours a day, 365 days a year. This design has a reduction in torque where it is needed the most. Electric motor parts can get extremely dirty and the interior of the motor is often covered in dirt and dust (on DC motors: carbon dust). Significant time has been spent troubleshooting some of these cases, only to find out that simple changes to the software in the VFD control system were available to eliminate the problems. The Fluke 810 Handheld Vibration Tester is designed to help maintenance professionals determine machine condition and get to the root cause of any problems quickly. Rotor - 5%. Excessive vibration can be a result of a defective sleeve, improper balance, misalignments, or excessive belt tension. Common ways to accomplish this include altering the stiffness of the base, modifying the weight of the motor/base combination or changing (usually lowering) the center of gravity (see Figure 2). In business since 1948, we are Henderson's only electric motor sales and service center. The source of the problem can be a mechanical issue with the pump, motor or coupling, or it can be hydraulic forces from the pump. Noise and Vibration Noise indicates motor problems but ordinarily does not cause damage. On-site or in our shop, we use the latest technology to find the problem and fix it fast. One of the first steps we take in our repair process here at HECO is steam cleaning your electric motor. A bad coupling between the motor drive shaft and the driven fan, fuel unit, or other component can cause vibration and noise as well as motor damage. Press and hold it for 5 seconds. Negotiated some compensation, but still ended up costing me an additional $320 for a warranty replacement, plus trips to a bike shop 150 miles away. Laron has been repairing and rewinding motors for over . A motor vibration analysis is one of the best predictive maintenance tests an electric motor shop can provide for the following reasons: Electric motors are highly effective and reliable drivers of machinery and other types of equipment. Our repair specialists and staff engineers are on call 24 hours a day. eccentric rotor. Occasional trips have been occurring due to high vibrations in the NDE motor bearing accelerometer on one of the units. The drive manufacturer did not supply the motors. Other failures are caused by vibration, physical damage and situations that causes excessive heat. All repairs tested and warrantied for 12 months. Motors repaired under this method have been proven to maintain and extend the life of AC motors. Motor Has Been Running, Then Fails to Start. Check for voltage at the pump motor or pump controls. CASE HISTORY 1 2.1 System Description Eight motors driving cooler fans (8 blades) through cog belts. Kansas City Electric Motor Service and Repair. An electric generator is mechanically identical to an electric motor, but operates with a reversed . We used sticks and stethoscopes to "listen" to vibration problems. Tom Bishop, P.E. Electric Motors. We perform AC Motor repairs on all makes and models from 5HP up to 500HP. Shaft or coupling - 2%. If power is on to the building, check fuse or circuit breaker serving the electric motor that won't run. Using a Fluke 87V, measure the voltage at the motor terminals to make sure the power is OFF. If the motor then operates smoothly, look for the source of noise or vibration in the driven equipment. We keep your motors running. Why Us. . click here. Contact our certified specialists today! Loose coupling between electric motor and driven appliance. Rotate the motor's shaft and feel for rubbing. Then, by simple process of elimination, zero-in on the source of the problem. Press the ON button on the remote control. Our dedication to quality and complete customer satisfaction makes us the smart choice for all of your motor repair needs. Vibration sensors for motors are mounted on machinery to monitor changes in the amplitude, frequency, and intensity of vibration. July 1999; Journal of Sound and Vibration 224(4):733-756; Authors: . In most cases, a single vibration frequency will be dominant — often at rotating speed. Ensure that electric motors are positioned on a flat and stable surface. If a motor problem does occur, the source of the problem needs to be promptly identified and corrected. . Vibration sensors can pick up information from sources such as structure, resonances, environment, adjacent machines, process, cavitation, and turbulence. In the summer of 2007, KG Power Systems was contacted by a New York Power Plant to troubleshoot an ongoing issue with (2) 250HP two speed blowers. Bearings - 51% Windings - 16% External causes -16% Unknown - 10% Rotor - 5% Shaft or coupling - 2% Motor failure? In a single-phase rotor test, you apply single-phase power to the motor so that the rotor slowly rotates. 11/10/2020. with 2 rotational vibration. Should be 0.10 or greater Very load . Tracking degrades the winding insulation which makes the problem worse over time, and may eventually result in a need to rewind the motor completely. Fuse or circuit breaker is tripped. A methodical investigative approach, however, can narrow the possibilities and make it easier to resolve the issue—with one caveat. Monitoring of the motor has not picked up a trip yet. YEARS. Excessive vibrations are difficult to detect by hand, but can significantly shorten the life of your electric motor. Your electric motor may need rewinding if it doesn't turn on, emits excessive noise and vibration, shooting electric sparks or the carbon brushes are wearing out more frequently. If the vibration ceases or sharply declines almost immediately, then the problem typically stems from an electrical issue. If it continues as the motor coasts without power, look for a mechanical unbalance. (Note: In motors with sleeve bearings, a reed critical speed of about 40 to 50 percent of running speed can cause vibration due to oil whip or oil whirl.) However, as pointed. Cullum & Brown offers in-shop and field repair capabilities along with new electric motor options for all of your NEMA motor frame needs. Field Service,Vibration Analysis,Troubleshooting and Repair of Electric Motors,Thermography,On-Site Balancing,Alignment,Diagnostics,AC/DC Motor Testing. Motor-related downtime can idle production lines, reduce productivity and throw schedules into disarray. From shaker motor repair, electric motor repair, vibrator motors, and much more, we have what you are looking for. 47. Electricians Electric Equipment Repair & Service Lighting Consultants & Designers. Noise, however, is usually accompanied by vibration. Electric Motor Training Course on Design, Control, Protection, Testing - Best Practices. Due to its closeness in frequency to twice-line-frequency vibration, the Tom Bishop, P.E., is a senior technical support specialist with the Electrical Apparatus Service Association and has more than 30 years of hands-on and engineering experience at electrical machinery manufacturing and apparatus service firms. Vibration Analysis Tests. In fact, the relative motion between the rotor and stator of an operating motor can vary from 1 to approximately 200 RPM, and from no load to full load respectively. 1321 E Sheridan Bridge Ln. For over 90 years, our company has focused on keeping your motor running at optimum performance. In an industrial climate where overall equipment efficiency (OEE) is becoming increasingly important, preventing unexpected failures of equipment is paramount. Monitor the vibration levels prior, during, and immediately after the power has been removed from the motor. Operating vibrations from uneven loads, poor alignment, or misassembly will obviously destroy a unit if left unchecked . A table listing faults, the principle vibration frequency, and comment on the signal characteristics and recommended correction is provided. Bishop has authored dozens of technical articles and papers and presented numerous seminars on electric motor application, maintenance, and repair. Most stator faults are caused by insulation breakdown which leads to winding failure. Bike shop worked with tech support but couldn't resolve the problem. When motors are installed on top of vertical pumps, high vibration is a common problem. excessive vibration, we use vibration signals as an indication of a machine's mechanical condition. This paper provides an over view of electric motor and generator principles, discussion of AC and DC motor construction, motor controllers, vibration data collection and processing. It is imperative, in all production operations that downtime be avoided or minimized. 5 HP 208/230-volt electric motor. Turn-to-turn short If the motor keeps running with stator faults, a high current will flow through the windings where the problem is located. Our commitment, years of experience and expertise we are here 24/7 for on-site and in-shop mechanical services. Electric motor repair, rewinds and refurbishments. 21st February 2013 Paul Boughton. We offer free pick-up and delivery. The Hipot Test for Dielectric Strength: Determining Efficacy of Cable Insulation. Check for local reset button on the motor (popped out = off ) - see step 3 below. Threading results in fine lines on the surface of your commutator. The fine lines occur when copper is transferred from the commutator to the brushes. Actions to Take to Fix Motor Vibration The first step is to isolate the cause of vibration. Turnaround can be within 24-hours, 7-days-a-week if necessary. (See Fig. 5.) This 2-Day Electric Motor Training Course highlights the most important problems, principles and concepts related to the induction motor, proper specification, installation, protection and control, maintenance, testing and management of electric motors into the distribution system. If no voltage is found, check for voltage at the electric panel. Website Services. It fills the gap that exists between high-end, complex vibration analyzers and low-end vibration pens, which sacrifice accuracy for cost and ease of use. Check the source of power, overload, fuses, controls, etc.. 2. Vibration problems in large induction motors can be extremely frustrating and may lead to greatly reduced motor reliability. Vibration sensors can pick up information from sources such as structure, resonances, environment, adjacent machines, process, cavitation, and turbulence. Vibration / spectrum analysis is an important tool in predictive or preventive maintenance programs. Monitoring programmes can give early warning of vibration problems. Reliance Electric Posted 1-10-05 Motor Maintenance - SCHEDULED ROUTINE CARE Introduction The key to minimizing motor problems is scheduled routine inspection and service. Capacitors are located on the outside frame of the motor. Mechanical / 11 minutes of reading. 5. 3. Belts, along with electric motors, shafts, and pulleys, are a critical component of power transmission in belt drive systems. Lock out and tag the starting mechanism per company policy. Starts (too many, not enough of a break between them or extended start times) are the culprit in some rotor failures. Take advantage of our in-house shop service. Shop Services; Field Services; . Shake and break. This condition shows up as a high amplitude peak at 2 X line frequency of 7,200 CPM, with harmonics, but no side bands. misalignment. Perform a check of the bearings. Weight: 475 pounds. RTA Electric Motor uses state of the art electric motor test equipment, including winding analyzer, vibration analysis equipment, laser alignment equipment and much . Vince Burson reports. dealt with the vibro-acoustic problems of motor structures. These RPM values vary widely from motor . And we can reinstall your motor using the latest vibration and laser alignment technology, assuring a longer running life. Electric Motor Repair. The filter has a 1/4 in. To perform a high current rotor test, you remove the rotor from the stator and apply a high current through the shaft of the rotor. Through the use of leading edge technology and the best trained people in the industry, Hupp Electric Motors has become an industry leader. Motor damaged and rotor is striking stator. IPMR understands that electric motor repair is a critical part of your business's operation. Electric Motor Repair & Steam Cleaning Go Hand in Hand. When electric motors have problems such as shorted lamination, they will thermally induce a bend as the machine heats up, with the resultant vibration getting higher and higher as the rotor heats. An electric motor is an electrical machine that converts electrical energy into mechanical energy.Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. Power supply or line trouble. Below are just a few of the many motor tests available. 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Test for Dielectric Strength: Determining Efficacy of Cable Insulation motor has not picked up a trip..
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