Spare parts, installation and maintenance of ac motors. This standard specification describes the requirements for the contractor to overhaul ashore in a suitable repair facility an alternating current ac induction or synchronous motor removed from a. A softstart controller is used in threephase ac induction motors to reduce the load on the selfstarting motor and the current surge of the motor during startup. Ac motors are generally reliable and last a long time before needing to be replaced. Generally speaking, motors and motor parts should be maintained and tested at least every 6 months. This ensures electrical equipment is kept in good working condition at all times. It is therefore used in starter motors of cars and elevator motors p. Threephase induction motor ac compact drives type 1ph718. In a good preventive maintenance program with detailed checks, the person in charge should have a record card on file for every motor in the plant. Severeduty enclosed motors can be used in highly corrosive or excessively moist areas. Threephase induction motor ac compact drives type 1ph722. Dripproof motors are intended to be used in a wellventilated place reasonably free of dirt and moisture. There are a multitude of singlephase motor combinations. After protector cools five minutes or more it can be reset and power may be applied to motor.
Factors which affect the life span of the motor due to lack of maintenance. Problems and premature failures often indicate input power system troubles, poor or deteriorating mechanical installations, or malfunctions in the driven machinery. An induction motor or asynchronous motor is an ac electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. The very first thing that you should do before starting any type of maintenance on a motor is a visual inspection, a lot of times the trouble can be found just by looking, because if the problem is that bad then it should be very obvious by ob. Troubleshooting problems on your ac motor is relatively straightforward, and providing you. These motors are widely used in industrial drives because they are rugged, reliable, economical and have the advantage of adapting any number of pole pairs. Like most motors, an ac induction motor has a fixed outer portion, called the stator and a rotor that spins inside with a carefully engineered air gap between the two. A 012015 abb motors and generators en 5 ac induction low inertia motors high dynamic performance series installation, operation, maintenance and safety manual. In modern plant operations, unscheduled stoppage of production or long repair shutdowns are intolerable.
A 3 phase induction motor can be used for different applications with various speed and load requirements. General purpose enclosed motors can be used where they are exposed to dirt, moisture, and most outdoor conditions. This standard specification describes the requirements for the contractor to overhaul ashore in a suitable repair facility an alternating current ac induction or synchronous motor removed from a coast guard vessel. Ac induction motors are also the most common motors used in main powered home appliances. Abm greiffenberger antriebstechnik gmbh products ac. Safety information 1 description 2 transport, assembly, and connection 3 startup 4 operation 5 faults 6 maintenance 7 spare parts 8 notes 9 threephase induction motor. Singlephase ac motors power myriad lowhorsepower commercial and.
Download electricity ac and dc motors controls and. The induction motor that runs on a three phase ac supply is known as a threephase induction motor. Above one horsepower 750 w, the tesla motor reigns supreme. Its ruggedness and simplicity make for long life, high reliability, and low maintenance. Electricity ac and dc motors controls and maintenance about the book. It is also the area of greatest component failure and maintenance requirements, in fact, the specific names for induction motors represent the means in which the revolving field is developed from a singlephase power source. The high cost of the resultant downtime eats deeply into profits. Do not lift both the motor and driven equipment with the motor lifting means. Maintenance and troubleshooting of electric motors reliance electric posted 11005 motor maintenance scheduled routine care introduction the key to minimizing motor problems is scheduled routine inspection and service. Yet small brushed ac motors, similar to the dc variety, persist in small appliances along with small tesla induction motors.
A wellplanned electric motor preventive maintenance programme is the key to dependable, longlife operation of electric motors. Ac drives lead the technical revolution of electric forklifts. What is common to all the members of this family is that the basic physical process involved in their operation is the conversion of electromagnetic energy to mechanical energy, and vice versa. Maintenance of induction motor all about squirrel cage. Squirrelcage and wound rotor induction motors, plus synchronous motors slip ring rotors. The only userserviceable parts on an ac motor are the brushes and the bearings. A wellplanned preventive maintenance program is the key to dependable, longlife operation of motors and generators. The field current of synchronous machines motors and generators is supplied by a separate dc power source while the field current of induction machines is supplied by magnetic induction transformer action into the field windings. The very first thing that you should do before starting any type of maintenance on a motor is a visual inspection, a lot of times the trouble can be found just by looking, because if the problem is that bad then it should be very obvious by observation. Ac induction low inertia motors high dynamic performance. Maintain high insulation resistance at all time and measure the insulation resistance by megger regularly. An induction motor can therefore be made without electrical connections to the rotor. Ac induction motors how ac motors work explain that stuff.
The two major classes of ac machines are synchronous and induction machines. In this article the care, repair, service and maintenance of electric squirrel cage motors has been discussed. Storage temperatures of 10 to 49 degrees c 50 to 120 degrees f with a maximum relative humidity of 60% must be observed. Environment depending on the site conditions it may be necessary to create a suitable stores area to hold the motor prior to installation. Systematic and periodic inspections of motors are necessary to ensure best operating results. A threephase alternating current is transferred to the fixed stator windings. This type of maintenance form can be referred to the schedule of planned. Ac induction motors odp, wpi enclosures, tenv, teao, tefc enclosure, explosion proof. Regular motor maintenance to avoid failure and prolong. The frequency of routine service varies widely between applications. Safety information 1 description 2 transport, assembly, and connection 3 startup 4 operation 5 faults 6 maintenance 7 spare parts 8 notes 9 threephase induction motor ac compact drives 1ph718 operating instructions. Maintenance and troubleshooting three phase induction motor. Therefore, motor troubleshooting involves the entire system, not just the. Low voltage ac induction motors operating instructions and motors for the long run.
Threephase induction motor operating instructions 1ph722. The ideal motor maintenance program aims at preventing breakdowns rather than repairing them. Electric motors objectives after studying this unit, the student will be able to state the purpose of an electric motor. Cover openings for ventilation, conduit connections, prevent entry of rodents, snakes, birds, and insects, etc. If manual protector trips, disconnect motor from power line. Whats the difference between ac induction, permanent magnet. We thank you for making this choice, and would ask you to read the contents of this manual. There are few simple rules for the maintenance for the motors. The owner of the motor is responsible for ensuring all required maintenance is performed and properly documented. Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. Rotator windings, which generate an electromagnetic force, turn the rotator. Unless the motor is designed specially, it should not be allowed to come in contact with corrosive gases.
These are of two types, squirrel cage and slip ring motors. This reduces the mechanical stress on the motor and shaft, as well as the electrodynamic stresses on the attached power cables and electrical distribution network, extending the. Safety information 1 description 2 transport, assembly, and connection 3 startup 4 operation 5 faults 6 maintenance 7 spare parts 8 notes 9 threephase induction motor ac compact drives 1ph722 operating instructions. Threephase ac induction motors are widely used in industrial and commercial applications. This instruction manual applies to both motors and induction. Maintenance safe maintenance practices performed by qualified personnel are imperative.
Spare parts, installation and maintenance of ac electric induction motors. The squirrel cage induction motor was designed for an extended service life under very demanding conditions. Ac induction motors are either singlephase or polyphase. An887, ac induction motor fundamentals microchip technology. Maintenance manual for low voltage ac induction motors operating instructions and motors for the long run. Whats the difference between ac induction, permanent. Protective measures such as hearing protection may be needed when in close proximity to a motor in operation. Switch on the motor, with the rotor locked, at 3phase a. Frequency, as expressed in hertz hz or cycles per second, indicates the frequency of the oscillations of alternating current.
A threephase ac induction motor is the only type where the rotating magnetic field is. The manufacturer of these products, baldor electric company became abb motors and mechanical. Introduction to ac motors chapter ac motors pdf version. The threephase induction motor is the extensively used for various kinds of industrial drives. This book provides quick access to current information on dc motors, ac motors, motor control, relays and timings of electromechanical and solidstate, synchronous motors, installation, sensor units, and engine maintenance. Temperature swings should be minimal to guard against. This book provides quick access to current information on dc motors, ac motors, motor control, relays and timings of electromechanical and solidstate, synchronous motors, installation, sensor units, and. However, should the motor require service, this manual includes a section that assists the. Marathon motor 2 maraton electric installation, operation and maintenance instructions for. A motor may require additional or more frequent attention if a breakdown would cause health or safety problems, severe loss of production, damage to expensive equipment or other serious losses. This instruction manual is for technical use only, not for.
Virtually all electrical motors use magnetic field rotation to spin their rotors. Ac induction motor capabilities for force, torque, and speed. Including the motors in the maintenance schedule for the driven machine or general plant equipment is usually sufficient. Induction motor basics, single phase and three phase. Installation, operation and maintenance instructions for ac induction motors 56 6800 frames nema 63 280 frames iec marathon electric contact motor customer service at.
Operating instructions and maintenance manual for low voltage. Only then is it possible to maintain a motors life and its efficiency. For a simplified ac induction motor shown in figure 1, the stator stationary electromagnet is composed of a set of coil like in a solenoid. Operation and maintenance instructions for ac induction motors pdf, 299. Baldorreliance integral horsepower ac induction motors. Operation and maintenance of reliance standard industrial ac induction motors 180 449 frames nema 112 280 frames iec ac motors solutions you can trust instruction manual b362025 april, 2007. Consider the time in which the current i stator in the coils of the stator is. Includes rib cooled motors, types hxr and nxr, and modular induction motors, frame sizes 400630.
Induction motor seminar ppt, pdf report study mafia. To prevent premature equipment failure or damage, only qualified maintenance personnel should perform maintenance. Installation, operation and maintenance instructions. Simple and rugged design, lowcost, low maintenance and direct connec tion to an ac power source are the main advantages of. Almost all electrical equipment requires planned inspection and maintenance being carrying out.
Ac motors are designed and rated for a certain type of ac power. Induction motor maintenance february 17, 2019 february 24, 2012 by electrical4u maintenance as the name suggests it is the action necessary for retaining or restoring a piece of equipment or machine to the specified operable condition to achieve its maximum useful life. Operating instructions and maintenance manual for low. Simple steps to electric motor maintenance r baker. Introduction to ac motors ac motors electronics textbook. An induction motor s rotor can be either wound type or squirrelcage. This checklist incorporates all range of motors equipment. Although management probably realizes the value of a good preventive maintenance pm. These motors are selfstarting and use no capacitor, start winding, centrifugal switch or other starting device. Horizontal squirrel cage mediumvoltage induction motor. Ac induction motors extruded aluminium profile corrosion protection several ratings per frame size.
Modern solidstate electronic circuits drive brushless dc motors with ac waveforms generated from a dc source. Installation and maintenance threephase induction motors. Various types of ac induction motors are available in the market. Simple and rugged design, lowcost, low maintenance and direct connection to an ac power source are the main advantages of ac induction motors. Ac induction motors are the most common motors used in industrial motion control systems, as well as in main powered home appliances. Motors need maintenance regularly in order to avoid failure and prolong their lifespan.
Depending on operating conditions, sound levels for electric motors may exceed 70 db. This type of motor has a major use in the different industrial applications due to numerous benefits such as higher efficiency, reliable cost, minimum maintenance and selfstarting feature. Real practical ac induction motors are much more complex than shown. Before starting maintenance procedures, be positive that. Rated linetoline voltage for threephase ac machines, that. Lecture 6 three phase induction motors cairo university. Manual for induction motors and generators both for safe and hazardous area, in french language.
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