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Q: What factors determine the number of poles in a DC machine?

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The speed of the machine is tied to the power supply frequency and the number of poles the machine has. It becomes impractical to make a round rotor machine with many poles, so machines that spin at low revolutions will typically be salient designs. A two or four pole machine could be round rotor designs.

Root locus

It depends on the motor. They can be purchased with different numbers of poles. The number of poles mainly changes the speed of the motor.

Let a rotating machine have following: Frequency (f); Speed of Motor (N); No. of Poles (P) N= (120*f)/P From above Speed N is directly proportional to frequency f indirectly proportional to number no. poles P

It depends on the frequency and the number of poles the generator has: RPMS = 120 * Frequency / number of poles

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The number of poles on stator and rotor is always the same. If they are not equal?æno torque will be produced, thus, the machine will not function.?æ

N=120f/P where N - number of rotations in rpm f - frequency in Hz and P - number of poles

The number of poles determines the speed a machine has to turn (RPMs). The more poles, the slower the machine can turn. I don't believe your statement is true. I've seen synchronous generators, for example, that turn at 1200 RPMS, and induction motors that turn at ~1800RPMs.

The two main factors are the frequency and the number of poles of the motor. A formula for RPM is HZ x 60 x 2/ number of poles the motor has.

The speed of the machine is tied to the power supply frequency and the number of poles the machine has. It becomes impractical to make a round rotor machine with many poles, so machines that spin at low revolutions will typically be salient designs. A two or four pole machine could be round rotor designs.

because N=(120*f)/P where N= speed in rpm f= frequency in Hz P= no. of poles as the relations shows above it is cleare that speed of machine inversly proportional to no. of poles.. so as the poles increses, speed of the machine decreses

Motor's number of poles.

Root locus

POLES

This describes the way the machine's armature conductors are connected relative to each other and to the number of poles. The two basic ways of connecting these conductors are called 'lap' and 'wave', but it gets more complicated, because these, in turn, can be connected 'simplex', 'duplex', 'triplex', etc.For lap windings, if there are p poles, then for:simplex: pduplex: 2ptriplex: 3petc.For wave windings, the number of parallel paths are:simplex: 1 x 2duplex: 2 x 2triplex: 3x 2etc.So, for a triplex lap winding machine with six poles, the number of parallel paths will be: 3p =3 x 6 = 18 parallel paths.

The number of poles in a generator is determined by the engineer who designed it. The only way to change the number of poles is to completely re-manufacture the generator.

You are dumb- a classmate.

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