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Induction Motor Interview Questions with Answers | Part-1

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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
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