Maintenance ac motors pdf

In modern plant operations, unscheduled stoppage of production or long repair shutdowns are intolerable. Ac motors are generally reliable and last a long time before needing to be replaced. Its operation is based on the principle that when a current carrying conductor is placed in a. There are few simple rules for the maintenance for the motors. Horizontal ac small industrial motors motor installation and maintenance instructions gei 56128h. Induction motor seminar ppt, pdf report study mafia.

Spare parts, installation and maintenance of ac motors. Large dc motors are used in machine tools, printing presses, fans, pumps, cranes, paper mill, traction, textile m ills and so forth. Maintenance interval for motors with baldor shaft grounding brush baldor shaft grounding motors are designed for. Nameplates, declaration of conformity and other collateral material may contain the. Integral horsepower ac induction motors english pdf manual rpm ac direct drive type ctm motor cooling tower inverter duty pm motors fl250, fl280, fl320, fl360, fl400, fl440 and fl580 english pdf manual rpm ac inverter duty motors english pdf manual rpm ac inverter duty motors english pdf manual rpm xe integral. Dc motors although ac motors are used in most of the cases, dc motors have many applications and used for multipurpose applications. A wellplanned electric motor preventive maintenance programme is the key to dependable, longlife operation of electric motors. The stator is a permanent magnet, so the motor is smaller in size. X2 condenser in parallel to the ac power, as per en2400. They have a number of other benefits when properly maintained. This course was designed to provide training for electricians, mechanics, and others, wanting to know more about ac and dc motor maintenance. Before starting maintenance procedures, be positive that. 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. Almost all electrical equipment requires planned inspection and maintenance being carrying out.

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. English pdf technical description preventive maintenance for acs550 and ach550 english pdf technical description preventive maintenance for acs800 english pdf technical description preventive maintenance for sami megastar english pdf technical description. An ac motor of this type may be part of a pump or fan or. The synchronous speed of an ac motor is the speed of the rotating magnetic field set up by the stator winding synchronous speed rpm 120 x frequency divided by the number of poles. Electric motor predictive and preventive maintenance guide abstract electric motor performance is vital to the reliable and efficient operation of power plants. Preventive maintenance service for low voltage ac drives. Electric motor predictive and preventive maintenance guide. Safety instructions this is the safety alert symbol. Maintenance safe maintenance practices performed by qualified personnel are imperative. Acdc motors installation, principle of operation, troubleshooting and repair. The owner of the motor is responsible for ensuring all required maintenance is performed and properly documented. The branch circuit represents the last step in the transfer of power from the service or source of energy to utilization devices. Virtually all electrical motors use magnetic field rotation to spin their rotors.

It is used to alert you to potential personal injury hazards. Motors are inherently highly reliable, requiring little routine maintenance. Insert 2 to 3 inch length of grease string into each hole on motors in nema 215t frame and smaller. Maintenance crews strive to reduce maintenance costs and manage their workloads more effectively. Improper motor storage will result in seriously reduced reliability and failure. Recommended maintenance practice for electric motors and. The manufacturer of these products, baldor electric company, became abb motors and mechanical inc.

The failure of one or more critical motors could cause lost capacity and excessive repair and maintenance cost. Motors need maintenance regularly in order to avoid failure and prolong their lifespan. Rotors for ac motors are heat treated to separate the aluminum bars from the rotors magnetic laminations. This course consists of 12 interactive, online lessons that address ac and dc motor maintenance. From the relationships shown above among s, p, q, e, i, and. Problems and premature failures often indicate input power system troubles, poor or deteriorating mechanical installations, or malfunctions in the driven machinery. Generally speaking, motors and motor parts should be maintained and tested at least every 6 months. On motors having drain plugs, remove drain plug and operate motor for 20 minutes before replacing drain plug. Maintain high insulation resistance at all time and measure the insulation resistance by megger regularly. Installation, operation, and maintenance instructions nema. Updated to the 2011 national electrical code, electricity 4. Therefore, motor troubleshooting involves the entire system, not just the. Joliet equipment corporation bringing you the best in electric motors general product information reconditioned dc drilling motors jec75zb jec75ze jec75yzf top.

Maintenance and troubleshooting three phase induction motor. Proper maintenance and upkeep in dc motor units when cared for correctly, direct current dc drives, motors, and their controls can offer excellent reliability over a long service life. Be sure to read and understand all of the safety notice statements in mn408 or product specific manual. Since dc machines require more attention than their ac counterparts, dc maintenance can help achieve both goals. There are many types of ac motors, but this course focuses on threephase induction motors, the most common type of motor used in industrial applications. Installation maintenance instructions permanent magnet ac motors. Installation, operation, and maintenance instructions nema 182t 286t, iec 112 180 permanent magnet motors operated on variable frequency drives vfd. Ac motors ac motors are used worldwide in many applications to transform electrical energy into mechanical energy. 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. Installation instructions extreme duck ultra q car.

Long term motor storage procedure mn417 storage information 11 storage storage requirements for motors and generators that will not be placed in service for at least six months from date of shipment. Permanent magnet ac motors pmac are just like standard induction ac motors except they have permanent, rareearth magnets attached to their rotors the center part of the motor that spins. Simple steps to electric motor maintenance r baker. An induction motor can be defined as the ac electric motor device in which a power source fed by the alternating current with the help of a primary winding.

The high cost of the resultant downtime eats deeply into profits. This is the seventh lesson in the acdc motor maintenance course. Polyphase ac induction motor troubleshooting guide. Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor. Direct drive fan motors hvac motors nema low voltage ac. Only then is it possible to maintain a motors life and its efficiency.

The frequency of routine service varies widely between applications. A wellplanned preventive maintenance program is the key to dependable, longlife operation of motors and generators. Factors which affect the life span of the motor due to lack of maintenance. Free download induction motor seminar ppt, pdf report. Preventive maintenance maintenance for drives abb drive. 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. Since there is such a wide variety of these motors, it is impossible to describe all of them.

This chapter will describe the most common types found on army watercraft. Noise for specific sound power or pressure level information, contact your local baldor representative. Safe maintenance practices performed by qualified personnel are imperative. However, existing maintenance recommendations proposed by. This remains true for most duties but may not be so where environmental conditions are aggressive, the starting duty is onerous, or high structural vibration is present. This ensures electrical equipment is kept in good working condition at all times. On motors equipped with slotted head grease screw, remove screw and apply grease tube to hole. Installation maintenance instructions ac induction motors. Having these permanent magnets instead of electromagnets reduces energy losses in the motor.

Both ac and dc motors must be manufactured with a great deal of precision in order to operate properly. It is therefore used in starter motors of cars and elevator motors p. Generally, it is known as the asynchronous motor because its running speed is less than its synchronous speed. By convention, q is shown as positive above the horizontal, when the circuit is inductive, and vice versa when capacitive see. Low voltage motors installation, operation, maintenance. The only userserviceable parts on an ac motor are the brushes and the bearings. Leeson and other major manufacturers use laminated stator, rotor and armature cores to reduce energy losses and heat in the motor. Troubleshooting problems on your ac motor is relatively straightforward, and providing you. Singlephase motors introduction singlephase ac motors are the most common motors built.

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