What type of motor would you select to perform each of the following jobs? Why?

(a) Vacuum cleaner $\quad$ (b) Refrigerator
(c) Air conditioner compressor $\quad$ (d) Air condition
(e) Variable-speed sewing machine $\quad$ (f) Clock
(g) Electric drill

Question

What type of motor would you select to perform each of the following jobs? Why?

(a) Vacuum cleaner [latex]\quad[/latex] (b) Refrigerator
(c) Air conditioner compressor [latex]\quad[/latex] (d) Air condition
(e) Variable-speed sewing machine [latex]\quad[/latex] (f) Clock
(g) Electric drill

Accepted Answer

(a) Universal motor—for its high torque

(b) Capacitor start or Capacitor start and run—For its high starting torque and relatively constant speed at a wide variety of loads

(c) Same as (b) above

(d) Split-phase—Fans are low-starting-torque applications, and a split-phase motor is appropriate

(e) Universal Motor—Direction and speed are easy to control with solid-state drives

(f) Hysteresis motor—for its easy starting and operation at [latex]n_{\mathrm{sync}}[/latex] . A reluctance motor would also do nicely.

(g) Universal Motor—for easy speed control with solid-state drives, plus high torque under loaded conditions.

Question 9.7: What type of motor would you select to perform each of the f...

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