Skip to main content

Featured Post

Induction Motor Interview Questions with Answers | Part-1

4 comments

Specifications Of 3 Phase Induction Motor

Specifications Of 3 Phase Induction Motor

Design specifications Of 3 Phase Induction Motor
Specifications Of 3 Phase Induction Motor


Following specifications are required to start the design of 3 phase induction motor: 


  • ✓ Rated output in H.P. or K.W.
  • ✓ Three phases
  • ✓ Frequency in Hz = f
  • ✓ Voltage in volts = V
  • ✓ Connections, star or Delta, Y or ∆
  • ✓ Speed in RPM = N
  • ✓ Type Squirrel cage rotor or wound rotor
  • ✓ Type of Duty (Continuous, intermittent etc.)
  • ✓ Power factor
  • ✓ Efficiency
  • ✓ Class of Insulation
  • ✓ Temperature rise
  • ✓ Full load current
  • ✓ Pull out Torque


Following symbols will be used for design:


  • Q = KVA rating of machine
  • P = Rating of machine in kW
  • Eph = Induced emf per phase in volts
  • (Generally applied voltage per phase = Induced emf per phase)
  • Iph = Current per phase in Amp
  • Tph = Turns per phase
  • D = Diameter of stator core in m.
  • L = Length of stator core in m
  • Ba = Average value of flux density over the air gap Wb/m2
  • ac = Ampere conductor per meter of the stator periphery
  • Ø = Flux per pole in the air gap Wb
  • P = Number of poles
  • n = Synchronous speed in rps
  • Kw = Winding factor
  • T = Pole pitch
  • Z = Total number of stator conductors
  • I = Current in each conductor in Amp
  • η = Full load efficiency
Labels:

Comments

Post a Comment

Popular posts from this blog

MarX Generator

MarX Generator | High voltage pulse generator Marx Generator - High voltage pulse generator What is MarX Generator? Marx Generator is Electrical circuit which used for generate high voltage pulse. Marx generator is same as like voltage multiplier circuit. First watch the video of marx generator.. Marx Generator produce high voltage Spark as like lightning. Now learn how to make marx generator... Circuit Diagram of marx generator circuit is shown in below image. Circuit Diagram of marx Generator Here, First capacitor are connected in parallel. When DC supply is applied, capacitors charge through resistor by voltage Vc. Spark gaps use as a switch, Here first spark gap voltage is greater than the voltage Vc. So spark gaps are behave as a open circuit during capacitor charge. Now to generate high voltage pulse, The first spark gap need to be breakdown. So, By breakdown spark gap will be short circuit an...
4 comments
Read more

Variable Inductance Transducer | Classification Of Variable Inductance Transducer

Variable Inductance Transducer | Classification Of Variable Inductance Transducer Variable Inductance Transducer | Classification Of Variable Inductance Transducer These are based on a change in the magnetic characteristic of an electrical circuit in response to a measurand which may be displacement, velocity, acceleration etc. Variable inductive transducer may be classified as follows: 1.Self-generating type In this type voltage is generated because of the relative motion between a conductor and a magnetic field. These may be further classified as follows: (A)Electromagnetic type (B)Electrodynamic type (C)Eddy current type 2.Passive type In this type the motion of an object results in change in the inductance of the coils of the transducer. These may be further classified as follows: (A)Variable reluctance (B)Mutual inductance (C)Differential transfer type 1.Self-generating Type (A)Eleotromagnetic t...
1 comment
Read more

Induction Motor Interview Questions with Answers | Part-1

Induction Motor Interview Questions with Answers | Part-1 Induction Motor Interview Questions with Answers | Part-1 Q.1 The frame of an induction motor is made of (A) aluminium (B) silicon steel (C) closed grained cast iron (D) stainless steel (E) bronze Answer:  (C) closed grained cast iron Q.2 The stator frame is an induction motor is used to (A) hold the armature stampings in position (B) ventilate the armature (C) protect the whole machine (D) provide return path for flux Answer:  (A) hold the armature stampings in position Q.3 The stator core of a 3 phase induction motor is laminate in order to reduce the (A) eddy current loss (B) hysteresis loss (C) both hysteresis and eddy current loss (D) weight of the stator (E) windage and friction losses Answer: (A) eddy current loss Q.4 An induction motor works with (A) dc only (B) ac only (C) ac and dc both (D) none of these Answer:  (B) ac only Q.5 Which of the following statement associated with polyphase induction motor is...
4 comments
Read more