ISSN : 2319 – 3182, Volume-2, Issue-4, 2013

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Highly Efficient Commutatorless DC Generator

Umesh Dattatray Hajare & Mahesh Dattatray Hajare

Yadavrao Tasgaonkar Institute of Engineering and Technology,

Chandhai, Karjat, Maharashtra, India

E-mail : umeshhajare7445@gmail.com

Abstract – I am going to present here how to design a

highly efficient dc generator without using any

commutator on its shaft. I am going to design such a dc

generator in which there will be zero core losses and

negligible friction and windage losses as well as the weight

of rotor is also reduced 10 times lesser than ordinary

rotors. Core losses are nullified by using thin insulator

material for rotor core able to carry rotor windings. Power

consumed by field poles is zero because they are

neodymium permanent magnets. Weight of rotor is

reduced by using a light weight nonmagnetic and non-

metal material. Reluctance of rotor material doesn’t

matter here because of a strong magnetic field produced

by field magnets. A disc rotor with slots on its inner and

outer periphery is wound by aluminium coil. Aluminium

coil and disc rotor will minimise the weight of rotating

body of machine minimising inertia of machine. In this

way the only energy consumed in machine is the power

required for electromechanical energy conversion, i.e.

power required to convert mechanical power into electrical

power to be taken out from generator terminals. So the

overall efficiency can reach up to 99.99 %( theoretically).

I. INTRODUCTION

In this paper I am going to present how to design a

highly efficient electric generator. Such a generator can

be designed by decreasing losses in it. Main losses in

any generator are core losses and copper losses in

addition with windage and copper losses. These losses

are decreased here by using some unique designs and

materials also. This generator is having a very light

weight disc type rotor. This rotor is responsible

decreased losses in generator. Stator of the generator is

nothing but strong permanent magnets, these magnets

nullify the stator losses. In this way the rotor and stator

combine decrease the losses in generator.

II. WORKING PRINCIPLE

The working principle of this generator is

depending on the Faradays law of Electromagnetic

induction. The disc rotor is carrying the armature

windings made of copper. Whenever rotor shaft is

rotated by the prime mover, armature windings cut the

strong magnetic field produced stator magnets and an

electromotive force is induced in armature windings.

Armature windings are connected to slip rings on the

shaft and current is collected through brushes. As the

armature windings cut the flux always perpendicular,

the current will be purely dc and hence no need of

commutator.

III. CONSTRUCTION

The construction of this machine is advanced and

very efficient for power transfer. First part of the

construction is the stator of the machine and it is

nothing but a permanent magnet with some ID and OD.

Another part of construction is rotor i.e. armature of the

machine and it carries windings.

Fig. 1

It is disc rotor made of plastic fibre and it is 2mm

thin, and slots on it carry the windings on it. The light

weight material to be used for it reduces the rotor core

losses as well as the windage and friction losses are

reduced by its disc type shape. In this way this generator

improves its efficiency.

International Journal on Theoretical and Applied Research in Mechanical Engineering (IJTARME)

ISSN : 2319 – 3182, Volume-2, Issue-4, 2013

28

Fig. 2

Fig. 3

IV. CONCLUSION

In this way a light weight rotor and its circular

shape can make a Commutatorless highly efficient dc

generator. This generator is different because it nullifies

the core losses that mean the core losses are zero here.

V. ACKNOWLEDGEMENT

We thank to all our professors to make us eligible to

research on such topic.

VI. REFERENCE

[1] B.L. THEREJA; ELECTRICAL

TECHNOLOGY 1984 edition, S CHAND

publications.