Question

A $3 \phi$, four-pole, $60 \mathrm{~Hz}, Y$-connected induction motor rated at $440 \mathrm{~V}$ and $1750 \mathrm{rpm}$ has the following per-phase model parameters: $R_S=$ $0.35 \Omega, X_s=1.1 \Omega . X_r^{\prime}=1.1 \Omega, R_r^{\prime}=0.15 \Omega$, and $X_m>>\left|R_r^{\prime} / s+j X_r^{\prime}\right|$ and can, therefore, be neglected. If the motor is operated at rated voltage and shaft speed, find the magnitude of the line current if the motor is used in a hoist that requires a torque of $146.29 \mathrm{~N}-\mathrm{m}$ to drive a load.

   A $3 \phi$, four-pole, $60 \mathrm{~Hz}, Y$-connected induction motor rated at $440 \mathrm{~V}$ and $1750 \mathrm{rpm}$ has the following per-phase model parameters: $R_S=$ $0.35 \Omega, X_s=1.1 \Omega . X_r^{\prime}=1.1 \Omega, R_r^{\prime}=0.15 \Omega$, and $X_m>>\left|R_r^{\prime} / s+j X_r^{\prime}\right|$ and can, therefore, be neglected. If the motor is operated at rated voltage and shaft speed, find the magnitude of the line current if the motor is used in a hoist that requires a torque of $146.29 \mathrm{~N}-\mathrm{m}$ to drive a load.
 
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Essentials of Electrical and Computer Engineering
Essentials of Electrical and Computer Engineering
David V. Kerns, Jr.,… 1st Edition
Chapter 16, Problem 8 ↓

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The synchronous speed \( N_s \) in RPM for a 4-pole motor at 60 Hz can be calculated using the formula: \[ N_s = \frac{120 \times f}{P} \] where \( f \) is the frequency in Hz and \( P \) is the number of poles. \[ N_s = \frac{120 \times 60}{4} = 1800 \text{  Show more…

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A $3 \phi$, four-pole, $60 \mathrm{~Hz}, Y$-connected induction motor rated at $440 \mathrm{~V}$ and $1750 \mathrm{rpm}$ has the following per-phase model parameters: $R_S=$ $0.35 \Omega, X_s=1.1 \Omega . X_r^{\prime}=1.1 \Omega, R_r^{\prime}=0.15 \Omega$, and $X_m>>\left|R_r^{\prime} / s+j X_r^{\prime}\right|$ and can, therefore, be neglected. If the motor is operated at rated voltage and shaft speed, find the magnitude of the line current if the motor is used in a hoist that requires a torque of $146.29 \mathrm{~N}-\mathrm{m}$ to drive a load.
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