Shaded pole single phase induction motors

Shaded pole single phase induction motors

 · Shaded Pole Single Phase Induction Motors The stator of the shaded pole single-phase induction motor has salient or projected poles. These poles are shaded by a Estimated Reading Time: 8 mins  · Definition: A shaded pole induction motor is a simple single-phase induction motor, which is self-starting with one of the poles shaded by the copper ring. The other Estimated Reading Time: 6 mins  · Shaded pole motor is a split-phase type single phase induction motor. The shaded pole motor is very popular for ratings below HP (~ 40 W) because of its extremely Estimated Reading Time: 4 mins

Shaded Pole Motor : Working, Characterisitcs and Its Applications

There are 5 types of single-phase induction motors on the basis of their starting methods: Resistance startCapacitor startCapacitor start capacitor runPermanent Capacitorand shaded-pole single-phase induction motor. Each of them is discussed in detail below. A single-phase induction motor creates an alternating magnetic field on giving an AC supply to its windings. But the magnetic field generated by it is pulsating. In other words, the magnetic field does not rotate, as in the case of a three-phase induction motor, shaded pole single phase induction motors.

The magnetic field builds up shaded pole single phase induction motors one direction, falls to zero, and then builds in the opposite direction. Thus, we need some external aid to make the magnetic field rotating.

By using some starting methods, we can make a single-phase induction motor self-starting. Based on these starting methods, there are five types of single-phase induction motors. But before discussing the types of single-phase induction motors, let us see the minimum requirements to create a rotating magnetic field. A rotating magnetic field requires at least two windings.

And the setup must follow these two rules:. But a single-phase induction motor has only one winding. So, to create a rotating magnetic field using a single AC supply and single winding, an auxiliary winding is used. This winding is placed perpendicular to the primary winding of the motor. The impedance of the auxiliary winding is different from that of the primary winding. Thus, it creates a phase difference between the currents flowing in the two windings, which leads to the creation of a rotating magnetic field.

Based on the type of impedance connected to the auxiliary winding of the motor, there are five types of single-phase induction motors. In this method, we connect a high resistance in series with the auxiliary winding of the motor, as shown in the figure. Due to this, the primary winding current Im lags the applied voltage by degrees, while the auxiliary winding current Is lags by degrees.

Thus, there is a difference of about degrees between both currents, as shown in the phasor diagram below. Although there lies a small phase difference between the currents, it is still sufficient to start the motor. It protects the auxiliary winding from overheating and burning.

Difference between Induction Motor and Synchronous Motor. It is an improved form of the resistance-start method. It contains an electrolytic capacitor in series with the auxiliary winding. In this case:. Due to this, the current in the primary winding lags the applied voltage, shaded pole single phase induction motors, while the auxiliary winding current leads the applied voltage, as shown in the phasor shaded pole single phase induction motors. It is visible that the phase difference between the currents has increased significantly.

Hence the starting torque of the motor also increases. Although the use of an electrolytic capacitor shaded pole single phase induction motors the starting torque, it has two problems:. So, to get smooth starting and running conditions, we use capacitor-start, capacitor-run motors. It uses two different capacitors placed parallel to each other, as shown in the figure. During starting, both the capacitors remain in the circuit.

The overall capacitance gets added, which gives a higher starting torque. Thus after that, only the running capacitor Cr remains with the auxiliary winding. This method is different from the above two types of single-phase induction motors. Here, shaded pole single phase induction motors, the auxiliary winding remains connected in the circuit at all times, i. This motor uses only one capacitor in series with the auxiliary winding. Here, the capacitor remains connected in the circuit during the starting as well as running.

So, there is no need for a centrifugal switch, as discussed in the above types of single-phase induction motors. The advantages of this motor are similar to that of a capacitor start, capacitor run induction motor. It uses a Pyranol insulated foil paper capacitor. This motor is entirely different from the above types of single-phase induction motor. It does not have any capacitors or moving switch parts.

Its stator has salient poles, provided with its exciting coil. A single-phase supply to the stator coil sets an alternating magnetic field in the core. This alternating magnetic field interacts with the shading coil and induces a current in the shading coil. The shading coil current creates a flux shading coil fluxwhich lags shaded pole single phase induction motors main coil flux by some angle.

It appears that field flux shifts from the unshaded portion to the shaded part of the pole. This shifting of flux is like a weak rotating field. This rotating field interacts with the rotor and creates a starting torque. Menu HOME Pinouts Proteus ESP32 Raspberry Pi EE Concepts Contact Us Advertise With Us Contact us Write For Us Get PCB.

Table Of Contents. How rotating magnetic field is generated in single phase Induction motor Types of Single-phase induction motors Resistance-start single-phase induction motor Applications Capacitor-start single-phase induction motor Applications Capacitor-start, Capacitor-run single-phase induction motor Advantages Applications Permanent capacitor single-phase induction motor Applications Shaded pole motor Working Applications. The two conditions to create a rotating magnetic field.

Resistance start Induction motor. Phasor diagram of resistance start induction motor. Suggested articles for you:. Circuit diagram of Capacitor start Induction motor. Phasor diagram of capacitor start induction motor.

Capacitor start capacitor run Induction motor. Permanent Capacitor Induction motor. Shaded pole Induction motor. Thank shaded pole single phase induction motors Reply.

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Shaded pole motor diagram and construction explained - Bright Hub Engineering

 · Definition: A shaded pole induction motor is a simple single-phase induction motor, which is self-starting with one of the poles shaded by the copper ring. The other Estimated Reading Time: 6 mins  · Shaded pole motor is a split-phase type single phase induction motor. The shaded pole motor is very popular for ratings below HP (~ 40 W) because of its extremely Estimated Reading Time: 4 mins  · Shaded Pole Single Phase Induction Motors The stator of the shaded pole single-phase induction motor has salient or projected poles. These poles are shaded by a Estimated Reading Time: 8 mins