Synchronous Motor and Brushless DC Motor Drives: Brushless DC Motor Drives (Trapezoidal PMAC): The cross section of a 3-phase 2 pole Brushless DC Motor Drives is shown in Fig. 7.15. It has permanent magnet rotor with wide pole arc. The stator has three concentrated phase windings, which are displaced by 120° and each phase winding […]
Synchronous Motor and Brushless DC Motor Drives Read More »
DC Motor Drives: Armature Voltage Control using Transformer : Variable voltage for the dc motor control can also be obtained by either using an auto-transformer or a Armature … Chopper Control of Separately Excited DC Motor : Motoring Control : A transistor Chopper Control of Separately Excited DC Motor drive is shown in Fig. …
Use of Efficient Semiconductor Converters: Prior to development of Use of Efficient Semiconductor Converters, inefficient power modulators were employed in several applications. While replacement of these power modulators by the semiconductor converters in appropriate applications brings about substantial amount of energy saving, the cost of replacement can be recovered in a short period ranging from
Use of Efficient Semiconductor Converters Read More »
DC Traction using Semiconductor Chopper Controlled DC Motors: Chopper control has replaced resistance control in all dc traction schemes, such as 1500 V dc main line and suburban traction, 750 V dc underground traction and electric buses. The chopper control has following additional advantages over the resistance control: Regenerative braking can be carried out almost
Semiconductor Converter Controlled Drives: These are now widely used both in ac and dc tractions involving dc and ac motors, and the conventional drives have all become outdated, and will be phased out in near future. The Semiconductor Converter Controlled Drives have several advantages. Some of their common advantages are listed below: High efficiency. Low
Semiconductor Converter Controlled Drives Read More »
Conventional DC and AC Traction Drives: The commonly used Conventional DC and AC Traction Drives are The dc Traction Drives Employing Resistance Control: The dc traction drives employing resistance control are: 1500 V dc traction on Bombay-Igatpuri-Pune section for main line and Bombay suburban 750 V dc traction in underground trains at Calcutta. 550 V
Conventional DC and AC Traction Drives Read More »
Brushless DC Motor Drives(Trapezoidal PMAC): The cross section of a 3-phase 2 pole Brushless DC Motor Drives is shown in Fig. 7.15. It has permanent magnet rotor with wide pole arc. The stator has three concentrated phase windings, which are displaced by 120° and each phase winding spans 60° on each side. The voltages induced
Brushless DC Motor Drives Read More »
Self Controlled Synchronous Motor Drive Employing a Cycloconverter: Self Controlled Synchronous Motor Drive Employing a Cycloconverter as shown in Fig. 7.13. Firing pulses are generated either by comparison of the motor terminal voltages or by rotor position senors as in the case of drive. Cycloconverter control has the advantages of smooth low speed operation, four-quadrant
Self Controlled Synchronous Motor Drive Employing a Cycloconverter Read More »
Closed Loop Speed Control of DC Motor: Closed Loop Speed Control of DC Motor – The converters (rectifiers and choppers) are built using semiconductor devices, which have very low thermal capacity. Consequently their transient and steady state current ratings are same. The dc motors can carry 2 to 3.5 times the rated current during transient
Closed Loop Speed Control of DC Motor Read More »
ADC0808 Pin Diagram: The ADC0808 Pin Diagram and ADC 0809 are monolithic CMOS devices with an 8-channel multiplexer. These devices are also designed to operate from common microprocessor control buses, with tri-state output latches driving the data bus. The main features of ADC0808 Pin Diagram are : 8-bit successive approximation ADC. 8-channel multiplexer with address
ADC0808 Pin Diagram Read More »
