What is overhauling of induction motor?
1)De-Coupling of Motor. 2)Testing of Motor before & after overhauling a)IR & PT Test b)Winding resistance 3)Dismantling all removable cable of motors. 4)Dismantling the Motor from the Starter. 5)Through cleaning of starter and rotor. 6)Varnishing of Starter winding and rotor.
How is motor overhauling carried out?
The scheduled maintenance of motor should be carried out in such a way that the motor does not reach this stage. Thus, proper overhauling of the motor is of great importance. Before overhauling the motor, rotor running hours should be calculated, along with the lifetime of the bearing (running hours).
How do you clean an induction motor?
Clean the inside of the motor with a rag and degreaser. Choose a non-flammable cleaning fluid, such as the degreaser you may have used for the motor’s exterior. Moisten a clean rag with the product, then use it to wipe debris off of any area you can reach. Avoid getting anything on the wires.
What is the procedure of induction motor?
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. An induction motor can therefore be made without electrical connections to the rotor.
What is overhaul equipment?
Overhaul refers to an examination of machinery and the repairs or changes that are made in response to the condition of the system. Interchangeable with Maintenance Repair and Overhaul (MRO) and Tear Down, Overhauling machinery can be unavoidable, and the only process that can restore machinery to working condition.
What is mechanic overhaul?
1 : to examine thoroughly and make necessary repairs or improvements on Mechanics overhauled the car’s engine.
How do you maintenance a motor?
Top Tips For Maintaining Electric Motors
- Develop a general maintenance and cleaning routine. Every company should have a cleaning routine in place if they don’t already.
- Check the motor’s lubrication.
- Regularly inspect the bearings.
- Reduce or eliminate vibrations.
- Inspect the rotor and stator.
- Record your findings.
How do you remove moisture from motor winding?
Open the end covers & terminal box of the motor. Blow the moisture/water ingressed in the motor by hot air blower. If you have an oven for drying out the motors, then put in them the motor with temp setting at 40 to 45 ℃ at least for 8 hours.
What happens when slip is zero?
What happens if the slip is zero? If Slip is equal to zero, rotor current is zero and torque is zero. The zero torque means motor will not rotate at all.
What is slip ring in induction motor?
A wound-rotor motor, also known as slip ring-rotor motor, is a type of induction motor where the rotor windings are connected through slip rings to external resistance. Adjusting the resistance allows control of the speed/torque characteristic of the motor.
What is overhaul process?
The overhaul process An overhaul always includes a complete disassembly of the engine, thorough cleaning and inspection of parts, repair of parts as needed and disposal of defective parts. Major items such as the crankshaft, crankcase and connecting rods are subject to special inspections.
What is the maintenance schedule for induction motors?
So the following inspection schedule (may vary depending on the type of machines and importance of that machine) must be carried out of Induction Motors. The maintenance program for every week : Examine commutator and brushes. Examine the starter switch, fuses, and other controls; tighten loose connections.
What are the most common problems with induction motors?
Rotor Faults: These are usually caused by broken bars or broken end rings, rotor misalignment and imbalance. The primary focus of problems in a three-phase induction motor is in their stators and their supports. The leading causes of failures are superheating, imperfections in the isolation, mechanical bearings, and electrical failures.
What should be considered when overhauling a motor?
Overhauling a Motor. Before overhauling the motor, rotor running hours should be calculated, along with the lifetime of the bearing (running hours). The bearing must be renewed if required. In the motor, bearings are most susceptible to damages from friction during transmission.
What is the difference between squirrel cage induction motor and wound rotors?
Squirrel Cage Type Induction Motor:- Squirrel cage induction motor requires significantly less maintenance as it does not contain brushes, commutators, slip rings. Wound Rotor Type Induction Motor:- Since it contains slip ring, brushes so it does require maintenance time to time.