Direct Current Machines Construction

Dynamo electric machinery; its design, construction, and operation; directcurrent machines Item Preview > removecircle Share or Embed This Item. EMBED EMBED (for hosted ...

Oct 01, 2003 · The first type of motor built is still in widespread use In the late 1800s, several inventors built the first working motors, which used direct current (DC) power. After the invention of the induction motor, alternating current (AC) machines largely replaced DC machines in most appliions. However, DC motors still have many uses. DC motor principles.

The construction of a synchronous motor (with salient pole rotor) is as shown in the figure at left. Just like any other motor, it consists of a stator and a rotor. The stator core is constructed with thin silicon lamination and insulated by a surface coating, to minimize the eddy current and hysteresis stator has axial slots inside, in which three phase stator winding is placed.

DirectCurrent Machine. an electric rotating machine that converts mechanical energy to DC electrical energy (a generator), or vice versa (a motor). It is reversible—that is, the same machine can operate both as a generator and as a motor. For example, traction motors of rolling stock and servomotors of highpower DC electric drives operate ...

Operation, Construction, and Functionality of Direct Current Machines brings together many concepts, from the most basic working principles and construction of DC machines to more advanced topics such as electromagnetism, armature reaction, parallel operations, and many more. Highlighting theoretical concepts and numerical problems, this book ...

Very large direct current machines, say, more than several megawatts rating, cannot be built with commutators. The largest motors and generators are all alternatingcurrent machines. The switching action of the commutator causes sparking at the contacts, posing a fire hazard in explosive atmospheres, and generating electromagnetic interference .

Construction of DC Machine (Generator Motor) The dc generators and dc motors have the same general construction. In fact, when the machine is being assembled, the workmen usually do not know whether it is a dc generator or motor. Any dc generator can be run as a dc motor and viceversa. The diagram given below represents the various parts of ...

A threephase synchronous motor has no starting torque. It has to be brought up to speed or as close to it as possible by some other means so that it can pull itself into synchronism. Once up to speed, the rotor field can be excited with direct current and the rotor is, in effect, then dragged around at the same speed as the threephase stator ...

A DC generator or direct current generator is one kind of electrical machine, and the main function of this machine is to convert mechanical energy into DC (direct current) electricity. The energy alteration process uses the principle of energetically induced electromotive force. .

Determine the (a) cost of goods manufactured, and (b) cost of goods sold. Cost of materials placed in production 69,000 Direct labor 27,000 Factory overhead 34,000 Work in process, March 1 15,000 Work in process, March 31 19,500 Finished goods inventory, March 1 .