Found 1006 Articles for Electronics & Electrical

A permanent split capacitor (PSC) motor is a type of single-phase induction motor. The circuit diagram of a permanent split-phase motor is shown in the figure below. The permanent split-phase induction motor consists of a squirrel cage rotor and the stator has two windings, viz. starting or auxiliary winding and main or running winding. This motor has one capacitor "C" which is connected in series with the starting winding of the motor. This capacitor is permanently connected in the circuit both at starting and running conditions of the motor.As the capacitor is permanently connected in the circuit and it splits ... Read More

The performance analysis of a single-phase, single-winding induction motor can be done with the help of the equivalent circuit that is shown in the figure. There are both forward and backward components of power and torque is present in the motor.Here, the torque of the backward field is in the opposite direction to that of the forward field and hence the total air-gap power in a single-phase induction motor is given by, $$\mathrm{𝑃_{𝑔} = 𝑃_{𝑔𝑓} − 𝑃_{𝑔𝑏} … (1)}$$Where, Pgf is the air-gap power for the forward field and is given by, $$\mathrm{𝑃_{𝑔𝑓} = {{𝐼}^{2}_{𝑚}}\:𝑅_{𝑓}}$$And Pgb is the air-gap power ... Read More

The equivalent circuit parameters of a single-phase induction motor can be determined from the blocked rotor and no-load tests. Except, the capacitor-run motor, the blocked rotor and no-load tests are performed with auxiliary winding kept open.Blocked Rotor Test on Single-phase Induction MotorIn the blocked rotor test, the rotor of the motor is blocked, i.e., remains at rest. A reduced voltage is applied to the stator so that the rated current flows in the main winding. The voltage, current and power are measured.Vsc, Isc and Psc are the voltage, current and power under the blocked rotor conditions. With the rotor blocked, ... Read More

A linear induction motor (LIM) is an induction motor that converts electrical energy input into linear or translational motion instead of rotational motion as in the case of a conventional induction motor.In a linear induction motor, the stator and the rotor are known as primary and secondary respectively. The secondary of the linear induction motor consists of a flat aluminium conductor with a ferromagnetic core. If the primary of the linear induction motor is connected to a three-phase supply, a traveling flux wave is produced which travels along the length of the primary.Due to the relative motion between the traveling ... Read More

A permanent magnet DC (PMDC) motor is a type of DC motor whose field poles are made up of permanent magnets. The cross-sectional view of a 2-pole permanent magnet DC Motor is shown in Figure-1In a PMDC motor, the permanent magnet poles are radially magnetised and mounted on the inner periphery of the stator of the motor. The stator also serves as a return path for the magnetic flux. The rotor of the PMDC motor has a conventional DC armature with commutator and brushes.In a permanent magnet DC motor, the torque is produced by the interaction between axial current carrying ... Read More

A hysteresis motor is a single-phase synchronous motor whose operating principle is based on the effect of magnetic hysteresis. According magnetic hysteresis, the magnetic flux density in a ferromagnetic material lags behind the magnetising force.Construction of Hysteresis MotorA hysteresis motor consists of a stator and a rotor (see the figure).The stator of the hysteresis motor has a main winding along with an auxiliary or starting winding. When the stator winding is fed from a single-phase supply, it produces a synchronously revolving magnetic field. The revolving magnetic field is accomplished by using a permanent split capacitor type construction of the motor. ... Read More

Operating Principle of Single-phase Induction MotorA single-phase induction motor consists of a squirrel cage rotor and a stator carrying a single-phase winding. When a single-phase AC supply is fed to the stator winding, a pulsating magnetic field (not the rotating) is produced. Under these conditions, the rotor does not rotate due to inertia. Hence, a single-phase induction motor is inherently not self-starting, but requires some auxiliary starting means.If the stator winding of a single-phase induction motor is excited and the rotor is rotated by an auxiliary means and the starting device is then removed, the motor continues to rotate in ... Read More

The differences between a single-phase and a three-phase induction motor are given below −A 1-phase induction motor requires single-phase AC supply, whereas a 3-phase induction motor need a source of 3-phase AC supply for its operation.1-phase induction motors produce low starting torque, whereas 3phase induction motors produce high starting torque.The efficiency of a 1-phase induction motor is less as compared to a 3phase induction motor.The power factor of a 1-phase induction motor is low, while the power factor of a 3-phase induction motor is high.1-phase induction motors are simple in construction, reliable and economical as compared to 3phase induction motors.1-phase ... Read More

A capacitor-start induction motor is a type of single-phase induction motor in which the starting torque is produced by using a starting capacitor and an auxiliary winding. The capacitor-start induction motor consists of a starting winding (S) and a main or running winding (M). Both the winding have the same number of turns. A starting capacitor (C) is connected in series with the starting winding as shown in the circuit diagram of the motor.The value of the starting capacitor is so chosen that the starting current Is leads the main winding current Im by an angle (α) of 90°. The ... Read More

The capacitor-start capacitor-run motor is a type of single-phase induction motor. The capacitor-start capacitor-run induction motor is also known as two value capacitor motor. The schematic diagram of a capacitor-start capacitorrun induction motor is shown below.The capacitor-start capacitor-run induction motor consists of a squirrel cage rotor and its stator has two windings, viz. the starting or auxiliary winding and the main or running winding. The two windings are displaced by an angle of 90° in the space.This motor uses two capacitors − the starting capacitor (CS) and the running capacitor (CR). The two capacitors are connected in parallel at the ... Read More