Derive the output equation of DC machine in terms of its main dimensions?

Answer 1

The difference between AC and DC has to do with the direction in which the electrons flow.

In DC, the electrons flow steadily in a single direction ("forwards").

In AC, electrons keep switching directions, sometimes going "forwards" and then going "backwards."

Answer 2

The output equation of a DC machine in terms of its main dimensions is typically given by:

Output power = (ɸNZP)/60

where: ɸ is the flux per pole in webers, N is the speed of the machine in revolutions per minute, Z is the total number of armature conductors, P is the number of poles.

Answer 3

he difference between AC and DC is that AC is an alternating current (the amount of electrons) that flows in both directions and DC is direct current that flows in only one direction; the product that is flowing being electrons. AC power is what fuels our homes. The wires outside of our house are connected at two ends to AC generators. DC is found in batteries and solar cells. Both AC and DC employ magnets to repel electrons. Electrons are negatively charged particles that are one of 3 components that make up an atom. Negative charges will repel negative charges and positive charges will repel positive charges, so one only needs to introduce a negatively charged item next to electrons to force them to move in the opposite direction. Likewise, you can attract electrons by introducing something that is positively charged into their environment drawing the electrons to it. This property of electrons is what allows for AC power to work; that is, they switch directions constantly. The picture to the left is a demonstration of AC power at work. The constant switching of directions is evident in the dotted appearance of the light lines. DC power was invented by Thomas Edison and first used to power our homes in the late 1800's. Its main drawback being that in order to receive DC power from a generating station, your home had to be located within a one mile radius of the station. DC power degrades as it moves away from its generating source; the further away, the less power. In addition, it is difficult to convert very high power DC current into the lower power current needed in our homes. Nikola Tesla discovered AC and sold his design to Westinghouse. AC power degrades very little over 100's of kilometers. When the power reaches an electrical pole outside our homes, a transformer converts to high voltage (the amount of energy carried with the electrons) to the low voltage needed to fuel our appliances. To convert AC to DC, a device needs an item called a rectifier. Many monorail systems use DC power. In addition, if you have a portable stereo, you may notice a button on the back that can switch from AC to DC; this means that you can power your device by plugging it in (AC) or by using batteries (DC).

Answer 4

The most striking difference between an AC and a DC motor is the commutation process which is a part of DC motors.

• The DC quantity that you supply to a brushed DC motorgets converted into alternating quantity in the armature circuitry by the help of the Commutator and brush assembly. In case of a brushless DC motor, this takes place in the inherent driving circuit. (Commutation is periodically reversal of the current direction between the rotor/armature and the external circuit).
• In an AC motor, the inversion/conversion of quantities (commutation) is not required/done.
• There are lots of other constructional differences (please consult a standard text book as a detailed coverage here will be difficult) among different kinds of AC and DC motors. Although all of the machines work invariably on the principle of Faraday's law of EMI.

Answer 5

yes if it is a series motor

no if its a shunt motor

most small power tools have dc motors

the difference being the field windings have laminated iron cores

sometimes called universal motors

they run cooler on dc

they have more torque on dc

the field poles dont have to be reversed 60 times every second

Answer 6

Hai, According to me, dc motor will not rotate if it is connected to ac supply. The Dc motor is designed in such a way that it should reach constant signal. If ac i.e., alternating signal is applied, for the first half cycle if say it tries to rotate in clockwise direction, in the second half cycle it will try to rotate in opposite direction, obviously resulting the DC motor in still position..

Answer 7

a dc machine is an electromechanical conversion device

dc machines are of two types basically. they are dc generators and dc motors. dc generators convert mechanical energy into electrical energy and it works on flemmings right hand rule(frr).while a dc motor converts electrical energy into mechanical energy and it works on flemmings left hand rule(flr)

Answer 8

An induction motor is, at its core, an inductor. When you present DC to an inductor, current increases linearly (proportional to inductance over time) until the limits of the power supply or the inductor are reached. Many times, that results in damage of one sort or another.

Answer 9

D.C motor works on direct current. and by changing its polarity we can change the direction of motor shaft. where in A.C motor this all not happening it and it works on alternative current

+++

Alternating, not "alternative" current. Some types of AC motor can be reversed by reversing the relative polarities of windings.

Answer 10

we know that "power developed by the armature" is equal to

(total magnetic loading) * (total electric loading) * (speed in rps)

=>( Bav * 3.14 * D*L) * (q * 3.14 D) * (N / 60) * 10-3 KW

= [(3.142/60) * Bav * q * 10-3 ] * (D2*L*N)

= (Co D2 L N) KW

the above equation is the output equation of DC machine in terms of its main dimensions..

where, Co = (3.142/60) * Bav * q * 10-3 which is known as output coefficient.