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What type of gears are used in the small loads and low inertia motors?

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in Design of Electrical Machines by (687k points)
What type of gears are used in the small loads and low inertia motors?

(a) spur gears

(b) helical gears

(c) worm gears

(d) worm gears and helical gears

The question was asked by my school teacher while I was bunking the class.

This interesting question is from Design Steps and Considerations in division Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

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The correct answer is (a) spur gears

For explanation: Three types of gears are made use of in the PMDC motors. The spur gears are made use of in the low inertia and small load motors.

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