For A 5kw Dc Motor The Number Of Slots Per Pole Should Be

  

If the number of slots per pole per phase 𝒒𝒒= 𝑺𝑺 π’Žπ’Žπ‘·π‘·. Is an integer, then the winding is called an. Integral-slot winding in case the number of slots per pole per phase, q is not an integer, the winding is called. Fractional-slot winding. For example a 3-phase winding with 36 slots and 4 poles is an integral slot. To avoid pulsations and oscillations of the flux in the air gap, the number of slots per pole should be a whole number plus half. When this is not possible or advisable for other reasons, the number of slots per pole arc should an integer. Number of teeth/pole shoe = 5 and flux passes through 5 teeth. The motor that drives these toys is nothing but a permanent magnet DC motor or PMDC motor. These types of motors are simple in construction. They are commonly used as a starter motor in automobiles, windshield wipers, washers, for blowers used in heaters and air conditioners, to raise and lower windows – and they are extensively used in toys. . Slot contains even number (may be 2,4,6 etc.) of coil- sides in two layers. Double-layer winding is more common above about 5kW machines Two coil –sides per slot 4-coil-sides per slot Coil- sides Coil- sides Coil - sides Overhang.

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FrequencyNumber Of Poles
24681012141618
60-cycles360018001200900720600514450400
50-cycles300015001000750600500428375334

where

RPM = shaft rotation speed or revolutions per minute

Hz = frequency or cycles/sec

Poles = number of poles of your motor.

Per

So, for example, if you have a 4 pole motor on 60 Hz then RPM=60*(2/4)*60=1800 rpm.

60Hz is the most common frequency in the US

50Hz is the most common frequency outside the US

Basically armature winding of a DC machine is wound by one of the two methods, lap winding or wave winding. The difference between these two is merely due to the end connections and commutator connections of the conductor. To know how armature winding is done, it is essential to know the following terminologies -
  1. Pole pitch: It is defined as number of armature slots per pole. For example, if there are 36 conductors and 4 poles, then the pole pitch is 36/4=9.
  2. Coil span or coil pitch (Ys): It is the distance between the two sides of a coil measured in terms of armature slots.
  3. Front pitch (Yf): It is the distance, in terms of armature conductors, between the second conductor of one coil and the first conductor of the next coil. OR it is the distance between two coil sides that are connected to the same commutator segment.
  4. Back pitch (Yb): The distance by which a coil advances on the back of the armature is called as back pitch of the coil. It is measured in terms of armature conductors.
  5. Resultant pitch (Yr): The distance, in terms of armature conductor, between the beginning of one coil and the beginning of the next coil is called as resultant pitch of the coil.
Armature winding can be done as single layer or double layer. It may be simplex, duplex or multiplex, and this multiplicity increases the number of parallel paths.
[Also read: Armature reaction in DC machines]For a 5kw dc motor the number of slots per pole should be lowered

Lap winding and Wave winding

In lap winding, the successive coils overlap each other. In a simplex lap winding, the two ends of a coil are connected to adjacent commutator segments. The winding may be progressive or retrogressive. A progressive winding progresses in the direction in which the coil is wound. The opposite way is retrogressive. The following image shows progressive simplex lap winding.

For A 5kw Dc Motor The Number Of Slots Per Pole Should Be

For A 5kw Dc Motor The Number Of Slots Per Pole Should Be Lowered

In wave winding, a conductor under one pole is connected at the back to a conductor which occupies an almost corresponding position under the next pole which is of opposite polarity. In other words, all the coils which carry emf in the same direction are connected in series. The following diagram shows a part of simplex wave winding.
Per

For A 5kw Dc Motor The Number Of Slots Per Pole Should Be Replaced