A 3-phase, 12 kW, start-connected permanent magnet (PM) motor has a rated speed of 2200 rpm when supplied from a 110 Hz supply. The d-axis and q-axis inductances are La= 3.5mH and Lq= 4.7mH, respectively. The armature resistance and rotational losses are negligible. The motor operates without field weakening up to 2200 rpm, and a negative direct-axis current is imposed if the motor operates at speeds above 2200 rpm. The no-load terminal line-to-line voltage at 1250 rpm is 420 V (RMS). a. Determine the permanent magnet flux linkage. b. Calculate the rated phase current. c. Calculate the rated line to line voltage of the PM motor.

A 3-phase, 12 kW, start-connected permanent magnet (PM) motor has a rated speed of 2200 rpm when supplied from a 110 Hz supply. The d-axis and q-axis inductances are La= 3.5mH and Lq= 4.7mH, respectively. The armature resistance and rotational losses are negligible. The motor operates without field weakening up to 2200 rpm, and a negative direct-axis current is imposed if the motor operates at speeds above 2200 rpm. The no-load terminal line-to-line voltage at 1250 rpm is 420 V (RMS). a. Determine the permanent magnet flux linkage. b. Calculate the rated phase current. c. Calculate the rated line to line voltage of the PM motor.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

See similar textbooks

Similar questions

• Q5/ in a DC motor. List and describe the types of losses that occur
The DC shunt generator with the terminal voltage 350 V, armature drop 7 V and the total brush drop 4 V, then the value of generated emf is
A) Although the magnetic field for each phase of a 3-phase induction motor is merely switching back and forth between north and south poles, the resultant magnetic influence from all phases sets up a rotating magnetic field to cut the rotor conductors. a) true b) false B) In a two-pole stator winding of a 3-phase motor, how many revolutions does the rotating tr) magnetic field make in one cycle of the electrical current? a) one b) 60 c) 3600 d) none of the above
In a three-phase induction motor the maximum torque occurs at 20% slip and the equivalent resistance of the secondary is 0.04Ω per phase. Find the equivalent load resistance and the load voltage and the load current. Output power is 20 kW.
What is the relationship between slip s) and load (Pa) in an induction motor? Please explain.
A large 3-phase, 4160 V, 60 Hz, squirrel-cage induction motor draws a current of 400 A and the total active power of 2500 kW when operating at full-load. The corresponding speed is accurately measured and is found to be 1178 r/min. The stator is connected in wye and the resistance between two stator terminals is 0.15 0. The total iron losses are 26.5 kW and the windage and friction losses are 15 kW. Calculate the following: The power factor at full-load The active power supplied to the rotor The total I²R losses in the rotor The load mechanical power [kW], torque [kN.m], and efficiency [%] a. b. C. d.
The DC shunt generator with the terminal voltage 375 V, armature drop 8 V and the each brush drop 2 V, then the value of generated emf is
In a synchronous machine, if magnetic field of the rotor lags the stator field by a mechanical angle "a": O A. It is only possible in an induction machine O B. It is a generator O C. None of the other choices are correct O D. It is a motor O E. It can't happen in synchronous machines; both fields are in synch