File
... When three phase supply is given to the stator of three phase induction motor, a rotating magnetic field is produced which rotates with synchronous speed. The flux passes through the air gap and cuts the rotor conductors which are stationary. Due to relative speed between rotating flux and sta ...
... When three phase supply is given to the stator of three phase induction motor, a rotating magnetic field is produced which rotates with synchronous speed. The flux passes through the air gap and cuts the rotor conductors which are stationary. Due to relative speed between rotating flux and sta ...
Closed Loop Control of Separately Excited DC Motor
... The variable speed, reliability and high performance are three main characteristics of an electric drive system due to which it can be easily controlled. The field of motor is connected directly to the power supply for the speed control. At the same time it is necessary for torque and speed control. ...
... The variable speed, reliability and high performance are three main characteristics of an electric drive system due to which it can be easily controlled. The field of motor is connected directly to the power supply for the speed control. At the same time it is necessary for torque and speed control. ...
Lab 3
... DC motors are in countless consumer products. Those in the lab were used in printers. There are different types of DC motors but they all work on the same basic principle. The motor contains a coil of wire in a magnetic field, and when current flows in the wire, the coil experiences a force which ca ...
... DC motors are in countless consumer products. Those in the lab were used in printers. There are different types of DC motors but they all work on the same basic principle. The motor contains a coil of wire in a magnetic field, and when current flows in the wire, the coil experiences a force which ca ...
Electronic Soft Starters
... and supply giving only unsynchronised on-off control No control over inrush currents or torque surge at start up Very rapid acceleration of load with large transient forces placed on drive train and electrical system ...
... and supply giving only unsynchronised on-off control No control over inrush currents or torque surge at start up Very rapid acceleration of load with large transient forces placed on drive train and electrical system ...
Basics on electricity and electrical generation
... flowing in a river (kg/s) and the electrical potential V with the the gravitational potential as water goes over a waterfall g · h then the expression for electrical power P carried as current “falls” down a potential difference is the same as that for the kinetic energy gained by of water going ove ...
... flowing in a river (kg/s) and the electrical potential V with the the gravitational potential as water goes over a waterfall g · h then the expression for electrical power P carried as current “falls” down a potential difference is the same as that for the kinetic energy gained by of water going ove ...
Induction Motors
... Torque-speed Characteristics-cont. Region1: The constant torque limit region is the region below the base speed ωb, which is the lowest possible speed for the motor to operate at its rated power. For the small back-emf in this region, the current can be set at any desired level by means of regula ...
... Torque-speed Characteristics-cont. Region1: The constant torque limit region is the region below the base speed ωb, which is the lowest possible speed for the motor to operate at its rated power. For the small back-emf in this region, the current can be set at any desired level by means of regula ...
Moving Conductor in a Magnetic Field
... – a.c. produces alternating magnetic field which induces current in nearby wires and so reduce transmitted power; this is absent in d.c. – It is possible to transmit d.c. at a higher average voltage than a.c. since for d.c., the rms value equals the peak; and breakdown of insulation or of air is det ...
... – a.c. produces alternating magnetic field which induces current in nearby wires and so reduce transmitted power; this is absent in d.c. – It is possible to transmit d.c. at a higher average voltage than a.c. since for d.c., the rms value equals the peak; and breakdown of insulation or of air is det ...
DC Motor
... combination makes a sliding switch that energizes particular portions of the armature, based on the position of the rotor. This process creates north and south magnetic poles on the rotor that are attracted to or repelled by north and south poles on the stator, which are formed by passing direct cur ...
... combination makes a sliding switch that energizes particular portions of the armature, based on the position of the rotor. This process creates north and south magnetic poles on the rotor that are attracted to or repelled by north and south poles on the stator, which are formed by passing direct cur ...
Stepper Motor DEMO - Computer Engineering Department (EMU)
... Stepping motors are electromagnetic, rotary, incremental devices which convert digital pulses into mechanical rotation. The amount of rotation is directly proportional to the number of pulses and the speed of rotation is relative to the frequency of those pulses. Stepping motors are simple to drive ...
... Stepping motors are electromagnetic, rotary, incremental devices which convert digital pulses into mechanical rotation. The amount of rotation is directly proportional to the number of pulses and the speed of rotation is relative to the frequency of those pulses. Stepping motors are simple to drive ...
Manual
... This apparatus allows students to easily create an electrical DC current by turning a hand crank. The two leads on the back of the apparatus allows for devices such as lamps or small motors to be attached to the apparatus. The back of the apparatus has brushes designed to collect direct current (DC) ...
... This apparatus allows students to easily create an electrical DC current by turning a hand crank. The two leads on the back of the apparatus allows for devices such as lamps or small motors to be attached to the apparatus. The back of the apparatus has brushes designed to collect direct current (DC) ...
power factor correction based control strategy for four
... in low-power appliances is increasing because of its features of high efficiency, wide speed range, and low maintenance. Brushless DC Motors are driven by DC voltage but current commutation is controlled by solid state switches. The commutation instants are determined by the rotor position. The roto ...
... in low-power appliances is increasing because of its features of high efficiency, wide speed range, and low maintenance. Brushless DC Motors are driven by DC voltage but current commutation is controlled by solid state switches. The commutation instants are determined by the rotor position. The roto ...
57KB - NZQA
... The effect of a reversed winding on the operation of a three-phase induction motor is stated, and two methods of rectification are explained. ...
... The effect of a reversed winding on the operation of a three-phase induction motor is stated, and two methods of rectification are explained. ...
Commutator (electric)
A commutator is the moving part of a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. It consists of a cylinder composed of multiple metal contact segments on the rotating armature of the machine. The commutator is one component of a motor; there are also two or more stationary electrical contacts called ""brushes"" made of a soft conductor like carbon press against the commutator, making sliding contact with successive segments of the commutator as it rotates. The windings (coils of wire) on the armature are connected to the commutator segments. Commutators are used in direct current (DC) machines: dynamos (DC generators) and many DC motors as well as universal motors. In a motor the commutator applies electric current to the windings. By reversing the current direction in the rotating windings each half turn, a steady rotating force (torque) is produced. In a generator the commutator picks off the current generated in the windings, reversing the direction of the current with each half turn, serving as a mechanical rectifier to convert the alternating current from the windings to unidirectional direct current in the external load circuit. The first direct current commutator-type machine, the dynamo, was built by Hippolyte Pixii in 1832, based on a suggestion by André-Marie Ampère. Commutators are relatively inefficient, and also require periodic maintenance such as brush replacement. Therefore, commutated machines are declining in use, being replaced by alternating current (AC) machines, and in recent years by brushless DC motors which use semiconductor switches.