Motor: power production, Electrical Engineering

Assignment Help:

The mechanical power produced at the armature of a motor is: P = Ta .

(power is in watts if torque is N.m and    in rad/sec).

Some of this will be lost due to friction and air resistance ('windage'). The remainder is available as mechanical output power.

This leads to two Torque definitions:

Ta is the so-called 'air-gap torque' produced by the armature

Ts is the 'shaft torque' that is available to drive the mechanical load

The difference is that lost due to friction, windage etc.

The input electrical power that is converted to mechanical power at the armature is that due to the product of the back emf and the armature current.

Note that e is smaller than the applied voltage, V.

In addition to mechanical losses (friction etc), some electrical power is dissipated in the armature resistance and field coil resistance. (In an ac motor, other losses occur due to magnetisation and eddy current losses).

Hence, for a shunt connected motor:

Ta.      = e . Ia = (V - Ia.Ra) . Ia

218_power production.png

while for a series connected motor:

Ta.     = e . Ia = [V - I.(Ra + Rf)] . I

1891_power production1.png


Related Discussions:- Motor: power production

Explain working of digital process control, Q. Explain working of Digital P...

Q. Explain working of Digital Process Control? Figure shows a block diagram for microcomputer-based control of a physical process, such as a chemical plant. A slight variation

Economic analysis of hydropower, find the net value of power if an average ...

find the net value of power if an average value of energy is assumed to be $0.05/KWh, the capacity value is $30/kw-yr ...

Discuss the essentials of an oscillator, Q. Discuss the essentials of an os...

Q. Discuss the essentials of an oscillator? The essential components of an oscillator are (i) Tank Circuit: It consists of inductance coil(L) connected in parallel with ca

Find the pull that must be exerted by the spring, Q. Figure can also be con...

Q. Figure can also be considered as a simple model of a magnetically operated relay that is commonly used for the automatic control and protection of electric equipment. Consider t

#choke coil, #what is the procedure of the choke coil experiment

#what is the procedure of the choke coil experiment

Show demagnetizing effect of armature reaction, Q. A20-hp, 250-Vshuntmotor ...

Q. A20-hp, 250-Vshuntmotor has a total armature - circuit resistance of 0.25  and a field-circuit resistance of 200.At no load and rated voltage, the speed is 1200 r/min, and the

Formation of energy bands in solids, Describe in brief the Formation of ene...

Describe in brief the Formation of energy bands in solids and hence explain how it helps to classify the solid in to conductors and insulators. Energy Bands in Solids Acco

Querying the gis, Querying the GIS: Interfaces which use the querying...

Querying the GIS: Interfaces which use the querying facility are available with the RDBMS. In the network-mapping environment, these give accurate and reliable information to

Exponentially weighted moving average, 1. The Excel file contains daily clo...

1. The Excel file contains daily closes for the S&P/TSX composite index from January 2, 2008 to December 31, 2010. Assuming that December 31, 2010 is the current day. A) Using the

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd