Induction motor parts by parts

Assembly line consisting of: – Welding line for housing incl. washing – Internal Assembly – External assembly incl. Dehydration furnace/oildegassing – Final testing line • Machining lines : – Crank case line (fully automatic) – Flange bearing  production (fully automatic) – Crankshaft line (fully automatic) – Conrod line – Piston line – Valveplate  production incl. Assembly – Cylinder Head grinding line • Motor: – Stator line – Lamination stamping • Deep drawing  cover – Press for cover incl. Tool • Lamination – High Speed lamination press (without annealing furnace )

The main testing parameters are noted down below. 1 to 3 no's are most Frequent test. While others are usually tested by steel supplier or R&D purpose by the motor experts. Hysteresis loss and eddy current loss in separate value. Permeability of the punched sheet. B-H curve generation. Maximum polarization Effective polarization Maximum field strength Effective field strength Remanence Coercive field strength Specific apparent power Hysteresis display Form factor J(H) values for graphic display Among them hysteresis & eddy current loss is namely core loss and it checked as regular checking parameter before giving to stator line feeding. Usually core loss value is checked in each roll of stator lamination from the Press punched lamination. There are 3/4 total renowned tester supplier worldwide. 

Round enamel wires specification should follow the boundary condition stated below- 1.      For copper wire  : a). Material : Round  wires  made  of  copper,  insulated  with  Polyester  or  Polyesterimide  Enamel and covered with Polyamidimide; copper material according UNI EN 1977 ed 06-2000 Cu-ETP 1-CW003A. The supplier has to show evidence for his sub-supplier of the basic material. b).Insulation : The over coat must satisfy the class G2 –  200 °C conditions when tested according to EN 60317-0-1 and EN 60317-0-3. According to EN 60317-13,  Round  wires  made  of  copper, insulated  with  Polyester  or Polyesterimide enamel and covered with Polyamidimide, Thermal class 200. C).Testing : Testing procedures for winding wires / Part 1 to Part 6 according to EN 60851  & chemical data according to EN1715-1 . 2.      For Aluminium wire : a). Material : Round wires made of aluminium, insulated with Polyester or Polyesterimide Ename

There are special grade of silicon steel used in hermetic compressor motor. As because the motor performance should be high enough to meet the requirement of compressor COP, we electric motor designer always prefer to use steel with low watt/kg (core loss) value. But, certainly we should keep in mind about the exponential price rise along with the core loss value. The range of core loss value can be allowed in the range of 1.85 to 2.5 watt/kg at 1 tesla. Si Steel roll for punching in High speed press

What is CBB60 Capacitor ? According to the provisions of China’s national standard  GB2470-81 , the capacitor named product model generally consists of the following four parts: Part I: The letter represents the name, the meaning of C is a capacitor. Part II: with letters material. Part III: numerical classification. Part IV: The digital serial number. For example: “ CBB60 ” Capacitor C  – meaning Capacitor B  – meaning the Dielectric is a non-polar organic film B  – meaning the Dielectric material is polypropylene 60  – meaning  Plastic can motor run capacitor .Broadly applied to starting and running of AC single-phase motors at  50/60Hz frequency for  AC motor ,  electric engine ,  water pump ,  generator  and high efficiency  compressors  of  refrigerators  etc. CBB60 Capacitor Feature: CBB60 Capacitors takes heavy-edge  metallized Al/Zn PP film  or web-like fuse film as dielectric. Its components are sealed with flame-retardant epoxy resin. It has cylindric

Usual Tests done in Stator 1. Direction of Rotation 2. Winding Resistance 3. High voltage Test 4. Surge test or Q-factor test The need of each test on stator is stated below- High voltage test: The poor working on motor coil during the production process makes the insulation distance shorter than standard and cause the bad performance on dielectric withstand voltage between line to line. Surge Test: If during motor winding process the copper/aluminium insulation damages or scratch forms then it cause the bad performance on dielectric withstand voltage between line to line. The quality is determined by this process. DC Resistance Test: To test if the resistance of coil is normal and balanced Direction of Rotation Test: To test if direction of rotation of electro magnetic induction is in specific direction.  

Induction motors rotor are usually Aluminium casted. The performance i.e. quality of electrical induction motors is depending on the quality of the rotor built into the motor. Thus quality assurance of this important component is more and more becoming to be a major issue. For critical applications such as hermetic compressors, pumps etc. continuous quality monitoring of the rotor has been applied for many years and has proven to be the key for superior product quality. To ensure quality following parameters need to check from R&D point of view.  Broken or interrupted rotor bars.   Cold soldered or missing connection between bar and end ring.   Porosity either in the end rings or the rotor bars due to faulty injection processes, inferior aluminum alloy quality, and/or gaseous contamination.   Insufficient oxidation between aluminum rotor bar and steel core resulting in the phenomenon known as soldering.   Deviation of the rotor bar angle (skew).   A short circuit betwe