US2234158A - Electromagnetic regulator - Google Patents

Description

March 4, 1941. F MENZEL 2,234,158

ELECTROMAGNETIC nEGULAToR Filed April 15, 1959 Patented Mar. 4, 1941 PATENT OFFICE 2,234,158 ELECTROMAGNETIC REGULATOR Friedrich Menzel, Stuttgart, Germany, assigner to Robert Bosch Gesellschaft mit beschrnkter Haftung, Stuttgart, Germany" Application April 15, 1939, Serial No. 268,115 In Germany April 22, 1938 3 Claims. (Cl. 171-229) The present invention relates to an electromagnetic regulator for dynamo-electric machines of electric installations including those suitable for use on vehicles, and having a resistance which may periodically be switched in series with the exciting winding of the dynamo.

In the known regulator constructions of installations of this type the resistance to be switched in before the exciting winding is formed mostly as a special or separate part of the apparatus, and is of suitable material which for example is tted in the base of the regulator.

It is also known, in regulators having only one regulator contact, which effects the periodic switching in of the resistance before the exciting winding, to apply this resistance'in the form of a demagnetising winding, or so called bucking coil,

beside the voltage coil on the electromagnet of the regulator.

According to the present invention a component part of the voltage coil of the regulator acting wholly in the same direction serves as the resistance to be switched in before the exciting winding of the dynamo.

For this purpose the voltage coil of the regulator is tapped at such a place, that at the instant of regulation the same ampere windings are effective at all positions of the regulator contact.

'Ihe arrangement according to the present invention has the advantages over the known construction with a resistance in the form of a trembler coil that firstly the resistance need not be wound as a special or separate coil, but can be wound as a unit with the voltage coil of Which it forms a part and secondly the construction is suitable for regulators with several regulator contacts whilst the known regulators can only be constructed with one regulator -contact.

The invention is more particularly described with reference to the accompanying drawing `which shows schematically by way of example,

one form of construction voltage regulator for dynamos suitable for use' on automobiles or other vehicles.

In the drawing the armature I and an exciting winding 2 form the dynamo. A voltage coil 4 wound about a magnet core 3 of the voltage regulator is divided at the place of division 5 into parts 4I, 42 in such a manner that the part 4I can serve as a switched in resistance for the exciting winding 2.

An armature 6 carries regulator contacts 'I, 8 respectively adapted for make and break with opposed xed contacts 9 and III. A spring II operates to draw the armature 6 into that position of rest in which the contacts 1 and 9 are closed. For the sake of completeness an automatic charg-`v ing switch I2 and a battery I3 are diagram-"5 matically shown in the drawing.

The number of windings of the parts 4I and 42 of the voltage coil together with their resistance values are so chosen that in each of the subsequently described regulation positions of l0 the contacts 'I, 8, 9, Il) the same number of ampere turns are active. The voltage coil 4 can thereby consist ofv parts composed of the same or different material. The voltage is regulated in a manner known in bucking regulators.

On the putting into operation of the dynamo the part 4I of the voltage coil serving as a switched in resistance is short circuited by the closed contacts 1, 9. 'Ihe voltage evolved by the dynamo assumes the value commensurate with the resistance of the exciting winding 2. Thus only the part 42 of the voltage coil 4 lies at the voltage evolved by the dynamo under these conditions.

If on account of increasing speed of the dynamo the voltage and therewith the current flowing through the part 42 has attained a predetermined value, then this current together with the windings of the part 42 requires a definite number of ampere turns at which the voltage regulator attracts its armature 6 against the pull of the spring .II, and thereby separates'the contacts 'I and 9, so that all the regulator contacts are open. At this moment when the part 4I is switched in before and in series with the exciting winding 2, to which the part 42 lies parallel, the same ampere turns are active as in the foregoing regulation position with closed contacts 1 and 9, by reason of the corresponding choice of the resistance and number of windings of the parts 4I and 42 as a result of the partial current flowing through the part 42, and of the total current flowing through the part 4I.

At higher speeds of rotation the armature 6 closes the contacts 8, I0, whereby the exciting 45 winding 2 and simultaneously the part 42 of the voltage coil 4 are short circuited. In the current ,circuit there lies now only the part 4I which commensurate with its number of turns and its resistance value, together with the current flowing through it at this instant', has again in this contact position, the same number of ampere turns as was attained in the foregoing regulation positions.

By the invention is thus obtained a regulator,

i... we,

in which, while avoiding a special or separate switched in resistance for the exciting winding, a part of the voltage bobbin serves as a switched in resistance and which, in spite of this, has the same electromagnetic force in each regulating contact position.

I declare that what I claim is:

l.` The combination, with a dynamo-electric machine, having an exciting winding, for electric installations on vehicles, of an electromagnetic regulator comprising a magnet core, a voltage coil wound about said magnet core and acting wholly in the same direction of magnetization, an amature, a contact operated by said armature, a fixed contact in the electric circuit oi' said machine for engagement with the contact operated by said armature, and a conductor lead extending from said exciting winding and the contact operated by said armature to a point of said voltage coil intermediate the ends thereof to divide said coil into two component parts, one o! which component parts perates as a resistance switchable periodically in series with said exciting winding by said contacts.

2. A regulating system for dynamo-electric machines such as for lighting and charging installations on vehicles comprising, in combination, a dynamo-electric machine having an exciting winding, a circuit including said winding,

and an electromagnetic regulator in said circuit.

and comprising only one voltage coil having a component part adapted to act as a resistance and wholly in the same direction magnetically as said voltage coil, said regulator also including an armature and contacts controlled thereby for periodically connecting said resistance in series withV said exciting winding.

3. In a regulating system for dynamo-electric- FRIEDRICH MENZEL.

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