Why slots are provided in motor?

The goal in designing slot shape is to maximize capacity for copper and other components while minimizing impact to magnetic flux or manufacturability.

What is a motor slot?

Slots in motor are meant for winding around them. … Number of such poles are decided by the windings, which in turm decide motor RPM and other characteristics. Windings in different slots are connected to give required number of pole, and the sequence of changeover and speed of rotation.

What is the use of the slot in the rotor?

The rotor is a cylindrical core made of steel lamination with slots to hold the wires for its 3-phase windings which are evenly spaced at 120 electrical degrees apart and connected in a ‘Y’ configuration.

What are slots in induction motor?

There are two types of slots, used in ac machines; these are open type and semi-enclosed type. Semi-enclosed slots are usually preferred for induction motors. An induction motor with semi-enclosed slots has low tooth pulsation loss, less noise, less magnetising current and reduced overload capacity.

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What is the main function of large number of slots in induction motor?

The large number of slots in induction motor * a) Provides better overload capacity.

How many slots does a motor have?

The number of slots depends on how many phases of power are provided to the coil windings. A basic single-phase motor usually has four slots that contain two pairs of coil windings, each offset by 90 degrees; a basic three-phase motor has six slots with three pairs of coil windings, each pair offset by 120 degrees.

How does the number of windings affect a motor?

More windings means more flux being cut and that reduces speed. Flux helps in Torque build up without which motor can’t move and forget about speed. … For AC induction or synchronous motor, same is true. More windings requires more poles and speed decreases with more number of poles.

What is crawling in 3 phase induction?

Sometimes, squirrel cage induction motors exhibits a tendency to run at very slow speeds (as low as one-seventh of their synchronous speed). This phenomenon is called as crawling of an induction motor. This action is due to the fact that, flux wave produced by a stator winding is not purely sine wave.

What happens when an AC motor is turned on?

As the coils are energized, the magnetic field they produce between them induces an electric current in the rotor. This current produces its own magnetic field that tries to oppose the thing that caused it (the magnetic field from the outer coils). The interaction between the two fields causes the rotor to turn.

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What does cogging mean?

a gearwheel, esp a small one. 3. a person or thing playing a small part in a large organization or process. verbWord forms: cogs, cogging or cogged.

How do you calculate the number of turns in a motor?

The number of turns in primary side is 500/10 = 50 . Number of turns in secondary side is 200/10 = 20. We can calculate the total turns ratio by calculating the voltage ratio ( primary side voltage / secondary side voltage = V1/V2). Now if you know voltage per turns then you can calculate the number of turns..

What is slots in DC machine?

The rotor of the type of DC motor we usually see has a lamination of slotted thin steel sheets (silicon steel plates), and the coil is inserted into the core slots. The minimum number of slots required to allow the rotor to rotate from any angle is three.

How many types of motor winding are there?

There are Two Types Of Motor Windings Normally used. Single Phase Motor Winding. Three Phase Motor Winding.

What is the main motive while choosing the number of rotor slots?

Explanation: The number of rotor slots are decided for quieter operation of the machine. The number of rotor slots differs from the number of stator slots by more than the number of poles.

What are the advantages and disadvantages of synchronous motor?

Synchronous motors requires dc excitation which must be supplied from external sources. Synchronous motors are inherently not self starting motors and needs some arrangement for its starting and synchronizing. The cost per kW output is generally higher than that of induction motors.

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What will happen if we increase the air gap in the induction motor?

If the air gap of an induction motor is increased, the following will happen: The permeability of the magnetic circuit rotor-to-stator will decrease. The magnetizing inductance of he motor thus decreases. … The magnetic flux in the air gap will decrease and leakage fluxes will increase.