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For a particular car windscreen wiper mechanism, an electric motor is required that can provide 5 N m of torque at about 35 rpm. A small permanent magnet d.c. motor is suggested as being suitable for this purpose.
The manufacturer's data is as follows:
Stall torque: 0.15 N m
Stall current: 15 A
No-load speed: 6000 rpm
No-load current: 0.5 A
Supply voltage: 12 V
Show that this motor has the power to do the job, and determine an approximate gear ratio with which it should be used in order to supply the necessary combination of torque and speed.
Verified Expert
The report is a solution to problem for calculating the DC motor torque for an application. The solution consist in estimating the torque available. The torque available is very much higher than the requirement and hence is sufficient to run the wind screen wiper.
I liked your comments and found them suitable. Thanks for clarifications, this resolves my query. This is a case which can be solved in more than one ways. You have checked the case using the stalling torque and the corresponding speed of the motor. I checked with no load condition itself and proved that the motor is capable to supply the torque requirement of the wind wiper. Pls. recall the question is to prove that motor is fit to run to wiper. Also, it is reasonable to use the rpm of motor as 6000, rather than solving with stall torque. With Stall torque the output speed of the motor is zero. In any case the answer is correct too.
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