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Tuesday, August 4, 2020 | History

4 edition of Direct current motors and generators found in the catalog.

Direct current motors and generators

Samuel Heller

Direct current motors and generators

repairing, rewinding, and redisigning

by Samuel Heller

  • 307 Want to read
  • 6 Currently reading

Published by Datarule Pub. Co. in New Canaan, Conn .
Written in English

    Subjects:
  • Electric machinery -- Design and construction.,
  • Electric machinery -- Direct current -- Maintenance and repair.

  • Edition Notes

    Includes index.

    Statementby Samuel Heller.
    Classifications
    LC ClassificationsTK2625 .H44 1982
    The Physical Object
    Pagination3 v. :
    ID Numbers
    Open LibraryOL3512377M
    ISBN 100911740090
    LC Control Number82072814
    OCLC/WorldCa9154427

    Contents include Mechanics of train movement, Series-parallel control: building up the speed-time curve, Control systems, Rheostat calculations, Direct current traction motors, Current collection, Single-phase railways, Three-phase and Split-phase railways, Brakes, Train resistance, D.C. motor performance and rating, Regeneration: comparison of. See also Wikipedia: "Testatika" Electrostatic generators. DC Motors. Direct Current (DC) motors have a "Commutator" that switches the part of the coil that is closest to the poles at the time, more or less similar to the legendary "donkey" that tries to catch the carrots, but never succeeds. See the very simplified commutator shown in blue.

    Direct Current Motors and Generators: principles, operation and maintenance by Wynne L. McDougal; F.E. Keith; Richard R. Ransom Shelf and handling wear to cover and binding, with general signs of previous use. Lightly bowed boards. Secure packaging for safe Rating: % positive. Resistance is that quantity which multiplied by the current gives the component of the impressed EMF that is in phase with the current. Appears in 10 books from Page 49 - The regulator coil is wound with a large number of turns of fine wire and the amount of current flowing through this coil is determined by the voltage of the battery.

    Chapter 5: Direct-Current Generators. Introduction. Hence, there are dc motors, dc generators, ac motors, and ac generators. A significant portion of this book is devoted to the study of these machines. A DC motor is an electric motor that runs on direct current power. In any electric motor, operation is dependent upon simple electromagnetism. A current carrying conductor generates a magnetic field, when this is then placed in an external magnetic field, it will encounter a force proportional to the current in the conductor and to the strength of the external magnetic is a device.


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Direct current motors and generators by Samuel Heller Download PDF EPUB FB2

This 4-hr Quick Book provides discusses salient features of DC motors and generators in detail. The course is based entirely on Naval Education and Training Materials (NAVEDTRA ), Electricity and Electronic Training Series; Module-5 and covers Chapter 1 and 2 titled “Direct Current Generators and Direct Current Motors”.

Direct-Current Machinery: A Text-Book on the Theory and Performance of Generators and Motors (Classic Reprint) [Harold Pender] on *FREE* shipping on qualifying offers. Excerpt from Direct-Current Machinery: A Text-Book on the Theory and Performance of Generators and Motors Although but few graduates in electrical engineering ever have occasion to design a generator or a motor.

The book uses numerous examples relating to motor control, because this is a very common application (disk drives, washing machines, conveyors, etc.). The small direct current motor is inexpensive and can be easily connected to the output of a PIC via a simple current driver interface.

The response of the motor is easily observed, yet can be. A DC motor is any of a class of rotary electrical motors that converts direct current electrical energy into mechanical energy.

The most common types rely on the forces produced by magnetic fields. Nearly all types of DC motors have some internal mechanism, either electromechanical or electronic, to periodically change the direction of current in part of the motor.

Page 32 - When the battery is to be taken out of service not to exceed nine months, and it is not practical to charge at least once a month, an equalizing charge should be given just before the idle period adding water during the equalizing charge so that the gassing will insure thorough mixing.

Fuses should be removed to prevent the use of the battery during idle period and care should be. U Construction of DC Generators The parts of a simple DC generator are shown in fig.().

The principle of operation of a DC generator is Direct current motors and generators book to that of the AC generator, which was discussed previously. A rotating armature coil passes through a magnetic field that develops between the north and. Hard Cover - VG - No dust jacket if issued - Other than light spine fading book is clean and tight - International Library of Technology: Electrical Engineering B Electricity and Magentism, Theory of Direct-Current Generators and Motors, Direct-Current Generators, Direct-Durrent Motors, Resistance Measurements, Direct-Current Measuring.

A coil of wire rotating in a magnetic field produces a current which changes direction with each ° rotation, an alternating current (AC).

However many early uses of electricity required direct current (DC). In the first practical electric generators, called dynamos, the AC was converted into DC with a commutator, a set of rotating switch contacts on the armature shaft.

Get this from a library. Direct current motors and generators: principles, operation, and maintenance. [Wynne L McDougal; Fay Ellsworth Keith; Richard Rose Ranson]. Direct current motors and generators are constructed very similarly. They function almost oppositely at first because a generator creates voltage when conductors cut across the lines of force in a magnetic field, while motors result in torque-- a turning effort of mechanical rotation.

Electric generator - Electric generator - Direct-current generators: A direct-current (DC) generator is a rotating machine that supplies an electrical output with unidirectional voltage and current. The basic principles of operation are the same as those for synchronous generators.

Voltage is induced in coils by the rate of change of the magnetic field through the coils as the machine rotates. A dc generator is an electrical machine which converts mechanical energy into direct current electricity.

This energy conversion is based on the principle of production of dynamically induced emf. This article outlines basic construction and working of a DC generator. Note: A DC generator can be used as a DC motor without any constructional.

Before we can explain the working principle of a DC generator, we need to cover the basics of generators. There are two types of generators – DC generators and AC generators. Both DC and AC generators convert mechanical power to electrical power.A DC generator produces direct power, while an AC generator produces alternating power.

Other members of the family are the direct-current (dc) motor or generator, the induction motor or generator, and a number lower than large turbine-driven generators, which is the subject of this book. Turbine-driven generators (for short: turbogenerators) take advantage of the factFile Size: 1MB.

and direct current (DC) theory, circuits, motors, and generators; AC power and reactive Generators, DC Motors, AC Theory, AC Power, AC Generators, Voltage Regulators, AC and Neville, Basic Electricity, Vol.

5, Hayden Book Company. Exide Industrial Marketing Division, The Storage Battery, Lead-Acid Type, The Electric Storage Battery Size: 1MB. direct-current motor[də¦rekt ¦kərənt ′mōdər] (electricity) An electric rotating machine energized by direct current and used to convert electric energy to mechanical energy.

Direct-Current Motor a DC machine that operates as a motor. DC motors cost more and require greater expenditures on maintenance than AC motors.

They permit, however. Get this from a library. Direct current motors and generators: repairing, rewinding, and redisigning. [Samuel Heller]. Find many great new & used options and get the best deals for Direct-Current Machinery: A Text-Book on the Theory and Performance of Generators and Motors by Harold Pender (, Hardcover) at the best online prices at eBay.

Free shipping for many products. DIRECT-CURRENT MOTORS. Direct-current motors. All dc motors must receive their excitation from some outside source of supply. Therefore they are always separately excited.

The interconnection of the field and armature windings can be made, however, in one of the three different ways employed for self-excited dc generators. Electrical machines - generators and motors (ESCQ4) We have seen that when a conductor is moved in a magnetic field or when a magnet is moved near a conductor, a current flows in the conductor.

The amount of current depends on: Figure Layout of a direct current generator. The Direct Current Motor In steady-state, an AC motor always rotates at the alternation frequency of its power supply.

Thus, an AC motor powered by the domestic mains supply rotates at 60Hz in the U.S. and Canada, and at 50Hz in Europe and Asia.DIRECT CURRENT GENERATORS LEARNING OBJECTIVES Upon completion of the chapter you will be able to: 1.

State the principle by which generators convert mechanical energy to electrical energy. 2. State the rule to be applied when you determine the direction of induced emf in a coil.

3. State the purpose of slip rings. 4. Principle of DC Motor. When a current carrying conductor is placed in a magnetic field, it experiences a torque and has a tendency to move.

In other words, when a magnetic field and an electric field interact, a mechanical force is produced. The DC motor or direct current motor works on that principal. This is known as motoring action.