DE272566C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- JKl 272566 - CLASS 21 d. GROUP

WALTER HEYMANN in METZ.

Patented in the German Empire on May 7, 1912.

Main trailing motors have the disadvantage that they can be used for energy recovery easily are not suitable, rather a more or less cumbersome switchover of the require excitation windings through which the armature current flows.

The purpose of the present invention is to make the main trailing motors essentially peculiar Advantages (e.g. strong excitement during

ίο Starting up and gradually decreasing excitement with increasing speed) with the advantages of the shunt motor (especially Possibility of energy recovery without switching the excitation).

Fig. Ι illustrates the invention. The essential parts of the main drive motor are the armature A (hereinafter referred to as the main armature) and the excitation E (main excitation). A second anchor α (hereinafter referred to as secondary or auxiliary anchor) is mechanically coupled to the main anchor A. The mechanical coupling can, for. B. can be achieved in that both armatures sit on the same shaft or the secondary armature is driven by any axis moving simultaneously with the main armature shaft with or without translation. The secondary armature α is excited by the winding (secondary excitation) e in such a way that with increasing speed it gives an increasing electromotive counterforce, i.e. counter-voltage to the mains voltage, so that the current flowing through the main excitation E falls with increasing speed up to any limit; at standstill the counter voltage is zero.

The dimensions are chosen in such a way that the counter-voltage occurring in the side armature cannot yet cause a magnetization reversal of the excitation E at the highest permissible driving or hoisting speed; In this entire area, the secondary anchor α, like the main anchor A, performs mechanical work. The excitation E mentioned here only needs to form part of the excitation for the main armature A, which is otherwise, for example, in a pure shunt.

The return of work through anchor A is possible as soon as the motor counter-voltage in anchor A rises above the mains voltage on a downhill slope, when lowering or when braking, which can happen automatically on a downhill slope or when lowering at a certain speed, or when braking by a special one initiated strengthening of the excitation E is achievable.

The secondary excitation & can be used in many ways, e.g. B. be connected as follows:

1. to the mains voltage in parallel with the circuit formed from main excitation E and secondary armature α (Fig. 2),

2. in the shunt to the main excitation E or a part of it (Fig. 3),

3. in the shunt to the side anchor a (Fig. 4),

4. in series connection to the main excitation E or a part of it (Fig. 5);

5. it can coincide with the main excitation E (Fig. 6);

6. it can be in the circuit of the main armature A , and that all or part of the main armature current flows through it (FIG. 7);

7. It can be formed by a difference between the main anchor span and its compensation become (Fig. 8);

8. The field of the main anchor A can be used to excite the secondary anchor α (Fig. 9);

9. it can be in shunt with the series or travel resistances of the main anchor A (Fig. 10);

10. It can consist of combinations of two or more of the aforementioned types of excitation be composed, the influences of the

ίο Individual impulses support each other or each other can counteract.

In some cases (see. Fig. 6, 8 and 9) both armature windings can be in the same Anchor iron, even place in the same grooves.

By choosing the secondary excitation e , certain control modes can be achieved for the drive motor; For example, because the secondary excitation e is connected in series with the main excitation E , a weakening of the secondary excitation e with increasing speed and thus a greatly slowed increase in the counter voltage in the secondary armature α can be achieved, whereby the.

Characteristic of the main excitation E approaches the shunt characteristic from a certain speed.

In some cases, e.g. B. if the secondary excitation e is dependent on the main armature current, the reverse current can make an additional voltage from the counter voltage of the secondary armature α , so that the secondary armature α now as a dynamo armature gives an additional voltage to the mains voltage and thus a strengthening of the excitation E with

³ ^ increasing returns from work. The secondary excitation e can also be used by series or shunt resistors or similar devices to regulate the gait of the vehicle engine, z. B. in such a way that the secondary excitation e is weakened to initiate braking, so that the counter voltage in the secondary armature α falls, the main excitation E thus increases.

It should also be mentioned that a side armature α is in the excitation circuit of several drive motors can be switched, and that the series resistors the main armature can also be used to control the main excitation current.

Claims (1)

Patent claim: Device for the automatic control of electric motors, whose armature current not touched, but rather fed by the mains voltage or part of it Excitation by a line in series with the engine speed changing voltage is influenced, characterized in that the generation This voltage serving special auxiliary armature winding when the main motor consumes power, also mechanical work makes and thereby the excitation of the main motor weakening, with increasing speed up to a certain limit also supplies increasing counter-voltage, while it does when the main motor returns power Performs mechanical or electrical work and, in the latter case, supplies an additional voltage, which the excitation of the main motor with increasing current return. 1 sheet of drawings.