It has been a standing problem among the scientists of the past and will perhaps be puzzled-over for many centuries to come; namely the most efficient method of transmitting power from one point to another. The nearest solution at present, and a very satisfactory one, is electricity. By means of...
Since this treatise is to deal only with the
construction of one special machine it is unnecessary
to go into an extended discussion of dynamo electric
machinery in general. Some of the parts common to all
electric machinery of this character will be mentioned
and then a short account of...
Electricity is the name given to an invisible agent known to us only by its attendant phenomena and by various manifestations called electrical. These manifestations, at first obscure and even mysterious, are now well understood. Indeed its great importance to mankind can only be realized when we remember that it...
This thesis comprises a series of tests run on a compound direct current generator and an induction motor; separately and combined as a set, with sheets of data; characteristic and efficiency curves and deduction drawn therefrom relative to the two machines.
This thesis develops a simulation model for a cumulative connected
compound direct-current generator to varify the operation of
this machine under conditions of slowly and rapidly changing loads.
The application of this simulation method will contribute to
more exact modeling of power system components. The accuracy
gained is in the...
A system consisting of two d-c generators, one exiting the other,
is controlled with an EAI 690 hybrid computer in an on-line operation.
The hybrid computer works as a predictive controller with an on-off
actuating signal. A fast-time, second-order model is used to determine
the switching time, and a small...
Real-time predictive voltage control of a direct-current (d-c)
generating system is achieved with the aid of a hybrid computer.
Some assumptions were required to adequately simplify the simulation
of the d-c generating system.
A predictive controller is used to maintain the load voltage of
the d-c generating system (the controlled...
Direct digital control is becoming quite common in the control
of industrial processes. However, due to the relatively high accuracy
of both analog and conventional digital systems for controlling the
speed of a dc motor, there has been a reluctance to try DDC for
this purpose. This thesis describes a...
A highly flexible numerical simulation model for the performance
prediction of brushless dc drives is presented, which is capable of
investigating unbalanced and asymmetrical operating conditions as well
as drives with non-ideal parameters. Numerical speed-up procedures
allow for the investigation of pulse-width modulated (PWM) drives using
a personal computer. Experimental...
Environmental concerns have renewed the interest in electric vehicles. To gain
widespread use, electric vehicles will also have to offer good performance and be
reasonably priced. AC drive systems using modern semiconductors can provide
efficient operation at the required power levels, but their cost at present is still too
high....