Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

Braking of DC Motor DefinitionElectrical braking stops a DC motor by controlling voltage and current instead of using mechanical friction.Regenerative BrakingIt is a form of braking in which the kinetic energy of the motor is returned to the power supply system. This type of braking is possible when the driven load forces the motor to run at a speed higher than its no-load speed with a constant excitation.The motor back emf Eb is greater than the supply voltage V, which reverses the direction of

What is a DC Motor Drive?DC Motor Drives DefinitionDC motor drives are systems used to control the performance of DC motors, enhancing operations such as speed, starting, braking, and reversing.Starting MechanismsStarting DC motor drives involves managing high initial currents to prevent motor damage, typically by varying resistance.Braking SystemsBraking is a very important operation for DC motor drives. The need of decreasing the speed of a motor or stopping it totally may arise at any moment,

What is the Starting of DC Motor?Starting current definitionThe starting current in a DC motor is defined as the initial large current that flows when the motor starts and needs to be limited to prevent damage.The action of counterelectromotive forceThe back electromotive force is the voltage generated by the rotation of the motor, which is the opposite of the supply voltage and helps regulate the starting current.Starting method of DC motorThe main method of limiting the starting current involv

What is Speed Control of DC Motor?Dc motor speed controlThe process of adjusting motor speed to meet specific operating requirements.The speed (N) of a DC motor is equal to:Therefore, the speed of the 3 types of DC motors (shunt motors, series motors, and compound motors) can be controlled by changing the quantity on the right side of the above equation.Dc series motor speed regulationArmature control methodArmature resistance control methodThis common method involves placing the control resista

What is Speed Regulation of DC Motor?Speed regulation definitionThe speed regulation of a DC motor is a change in speed from no-load to full load, expressed as a fraction or percentage of full load speed.Good speed regulationA motor with good speed regulation has the smallest difference between no-load and full-load speeds.Motor type Permanent magnet dc motor Dc shunt motor Dc series motor Compound dc motorVelocity and electromotive force relationThe speed of a DC motor is proportional to the el

What is Compound Wound DC Motor?Compound Wound DC Motor DefinitionA compound wound DC motor (also known as a DC compound motor) is defined as a self-excited motor using both series and shunt field coils to combine the benefits of high starting torque and good speed regulation.Types of Compound Wound DC MotorsLong Shunt Compound Wound DC MotorVoltage and Current Equation of Long Shunt Compound Wound DC MotorLet E and Itotal be the total supply voltage and current supplied to the input terminals o

What is Series Wound DC Motor ?Series Wound DC Motor DefinitionA series wound DC motor is a type of self-excited motor where the field winding is connected in series with the armature winding.ConstructionThe motor includes key parts like the stator, rotor, commutator, and brush segments, similar to other DC motors.Voltage and Current EquationLet the supply voltage and current given to the electrical port of the motor be given by E and Itotal respectively.Since the entire supply current flows thr

What are Brushless DC Motor?BLDC Motor DefinitionA brushless DC motor is defined as an electronically commutated motor that lacks brushes, enhancing operational efficiency and torque.Core ComponentsA BLDC motor consists of two primary parts: the rotor (rotating) with magnets, and the stator (stationary) with windings. Permanent magnets on the rotor interact with the stator’s electromagnets, controlled by high-power transistors and a solid-state circuit for power distribution.Design TypesInner Ro

What is Construction of DC Motor?DC Motor DefinitionA DC motor is defined as a device that converts direct current electrical energy into mechanical energy.A DC motor is constructed with: A Stator A Rotor A Yoke Poles Field windings Armature windings Commutator BrushesStator and RotorThe stator is the stationary part with field windings, and the rotor is the rotating part causing mechanical motion.Field Winding in DC MotorField winding, made of copper wire, generates a magnetic field for rotor o

What is the Operating Principle of DC Motor?DC Motor DefinitionA DC motor is defined as a device that converts direct electrical energy into mechanical energy using magnetic fields and electrical currents.The following are the basic steps of the working principle of DC motors:Excitation field: When a DC power supply supplies power to the windings in the stator (fixed part), a constant magnetic field is generated in the windings.Electromagnetic force: When a current passes through the winding of