How do you calculate coil span?

Coil Span: The number of core slots spanned by the sides of the coil. In the above example, the span would be 8 slots (9 – 1). 3. Slots Per Pole: The number of slots in the armature core divided by the number of poles constituting the field.

What is coil pitch and coil span?

Coil span (also known as coil pitch) is defined as the peripheral distance between two sides of a coil, measured in terms of the number of armature slots between them. This number is known as coil span. If the coil span is equal to the pole pitch, then the armature winding is said to be full – pitched.

What is coil span in alternator?

Coil span or coil pitch is defined as the distance between the two sides of a coil. Pole pitch is defined as the angular distance between the central line of one pole to the central line of the next pole. A pole pitch is always 180° electrical regardless of the number of poles on the machine.

What is span factor?

The Coil Span Factor or Pitch Factor KC is defined as the ratio of the voltage generated in the short pitch coil to the voltage generated in the full pitch coil. If the span of the coil is reduced by an angle α electrical degrees, the coil span will be (180 – α) electrical degrees. …

What is the relation between coil span and harmonics?

4. What is the relation between coil span and harmonics? Explanation: The coil span is kept low in order to decreases the harmonics. The advantage of having lower coil spans is that it reduces the harmonics drastically.

What is the relation between coil span and harmonics Mcq?

The coil span should be 8.33 percent of pole pitch to obtain the maximum reduction of harmonics. Clarification: The coil span adjustment indirectly affects the harmonics reduction. The coil span should be minimum of about 8.33 percent of pole pitch to obtain the maximum reduction of harmonics. 6.

What is the coil span for a 4 pole 48 slot machine?

Explanation: Slots per pole = 48/4=12, for a coil span of 10 slots, the coil is short pitched by 2 slots and the chording angle is ε=2γ and γ=180/12 ⇒ ε = 30° ⇒ Kp=cosε/2=0.9659.

How long can a coil wire be?

The maximum length of the coil wire from the coil to the center of the distributor should be no longer than 2 1/2-3 feet. The maximum length of the coil wire from the coil to the center of the distributor should be no longer than 2 1/2-3 feet.

How do you know how many coils are in a wire?

To determine the number of active coils in an extension spring, you divide the body length (length of spring without the hooks), by the wire diameter, and subtract one coil.