In Control Systems, a Unity Feedback System is a closed-loop control system in which the feedback transfer function is equal to unity . In this type of system, the output signal is fed back directly to the input without any amplification or attenuation. Definition A unity feedback system is a feedback control system in which …
The efficiency of a DC motor is defined as the ratio of mechanical output power to the electrical input power supplied to the motor. It indicates how effectively the motor converts electrical energy into mechanical energy. Efficiency is an important parameter used to evaluate the performance of DC machines. Definition of Efficiency Efficiency \((\eta)\) of …
A DC shunt motor is a type of direct current (DC) motor in which the field winding is connected in parallel (shunt) with the armature winding. Because the field winding is connected directly across the supply voltage, the field current remains almost constant, resulting in good speed regulation. DC shunt motors are widely used in …
The developed torque of a DC motor is the torque produced due to the interaction between the magnetic field of the stator and the current-carrying conductors of the armature. This electromagnetic interaction converts electrical energy into mechanical energy, causing the rotor to rotate. Basic Principle According to Lorentz force law, a current-carrying conductor placed in …
A DC series motor is a type of direct current (DC) motor in which the field winding is connected in series with the armature winding. Because of this series connection, the same current flows through both the armature and the field winding. DC series motors are known for producing very high starting torque, which makes …
The Ward–Leonard System is a classical and highly effective method used for smooth speed control of a DC motor. It was widely used in industries before the development of modern electronic drives and is especially useful where precise and wide-range speed control is required. Basic Principle The Ward–Leonard system controls the speed of a DC …
A DC Motor is widely used in electric drives because its speed can be controlled easily over a wide range. Speed control is essential in applications such as electric traction, cranes, rolling mills, elevators, and machine tools where different operating speeds are required. The speed of a DC motor depends on the applied voltage, field …
Slip is an important parameter in the operation of a three-phase induction motor. It represents the difference between the synchronous speed of the rotating magnetic field and the actual speed of the rotor. Slip is essential for the operation of an induction motor because electromagnetic torque is produced only when there is relative motion between …
The Star–Delta starter is one of the most commonly used methods for reducing the starting current of a three-phase induction motor. It is widely used for medium-size motors. In this method, the motor initially starts in a star (Y) connection and after reaching a certain speed, it is switched to a delta (Δ) connection for normal …
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The Direct-On-Line (DOL) starting method is the simplest and most widely used method for starting three-phase induction motors. In this method, the motor is connected directly to the full supply voltage without using any voltage-reducing device. Because the motor receives the full rated voltage at start, it produces high starting current and high starting torque. …
Direct-On-Line (DOL) Starting Method of Induction Motor Read More »