MECH3006 - Mechatronic Electric Motors Design - Western Sydney University

Assignment Task

Question

Electric Motors

Refer to the AC motor performance curve shown in Figure 4-1 below, and answer the following questions:

a) What type of motor is the curve likely to represent?

b) What are the applications of this type of motor in practical?

c) If the motor is a six-pole type, what is its synchronous speed if consider the frequency at 60 Hz?

d) If the six-pole motor is rated at 559.3+ (q/1000) W, how much torque can it exert at the rated load?

e) How much torque can the motor develop to start a load?

f) What is the breakdown torque for the motor?

g) This shows the speed-torque curve for a household power tool, which is designed to operate at 1725 rpm, and X = q/20. Re-skitch speed-torque curve with X values and specify a suitable motor, giving the type, power rating in watts, and number of pol

Clutches and Brakes

1. Compute the dimensions of an annular plate-type brake to produce a braking torque of 33.9 + q/100 (Nm). Springs will provide a normal force of 1423.4 + (q/100) (N), between the friction surfaces. The coefficient of friction is 0.25. The brake will be used in average industrial service, stopping a load from 750+ q/100 rpm. (Acceptable average industrial service WR with a range of ± 10%).

2. Design a band brake as frequently used brakes to exert a braking torque of 81.36 + q/100 (Nm), while slowing the drum from 120 + (q/100) rpm. If trial known values are: Maximum pressure (pmax) = 172.4 kPa Coefficient of friction between the band and the drum f=0.25 Bandwidth (w)=0.051m And angle of lap (θ) =2450 . Lever geometry are a=0.127 m and Lever length (L)=0.381m. (Acceptable frequently used brakes WR with a range of ± 10%)

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