SU30494A1 - Electric speed indicator - Google Patents

Description

The existing electrical speed indicators (tachometers) on ships are built on the principle of voltmeters and are powered by a dynamo with permanent magnets, rotated from a Corhab propeller shaft. Due to the instability of the permanent magnet, the delicate design of the devices, the unstable position, the arrows at zero devices quickly went down.

In the proposed electric decree, the body of rotational speed, which is driven by the propeller shaft, electromagnets are turned, facing the same poles, to each other, fed from the ship's electrical circuit in series with the moving indicator system and creating a constant magnetic field. the positions of the moving system, the magnetic circuits of theirs are closed by an additional positive, located symmetrically with respect to the electromagnets.

Powered by a dynamo rotated from a rammer propeller shaft, the pre-winding electromagnet windings are used to form a field varying with the speed of the ships

here and UT various polarity on o0ra-; shchennykh each drup ends.

In FIG. 1 shows a longitudinal section of an electric speed indicator; FIG. 2 is a cross section of it; FIG. 3 is a longitudinal section of an electromagnet coil; FIG. 4 - electric circuit diagram.

The electric turntable consists of 3, 2, with fiber covers, 2 installed on iron supports, an iron ring 7 with electromagnets J3 attached to it, turned poles of the same name to each other and equipped with pole tips 72. On a roller JO placed between the thrust screws 9, fixed mobile system / 7 index. Roller 70 is associated with helical copper springs 75 mounted on holders 5 and 7, of which the latter is at the same time an arresting device. An additional pole 5 is located symmetrically with respect to the electromagnets J3, which serves to close the magnetic circuits of the electromagnets 75 to obtain a stable position of the moving system 77 at zero. J4 coils

(Fig. 3) J3 electromagnets are equipped with two windings - I, fed from the ship's electric circuit, and dynamo rotated from the propeller shaft.

The current from the ship's main enters through the voltage regulator into the primary winding I (Fig. 4) of coils J4 of electromagnets 75, passes through the moving system / 7 and returns to the voltage regulator through resistance. Under the influence of the current, the terminals 72 of the electromagnets J3 are magnetized with the same name. The magnetic field lines pass from the tips of 72 PLOs through the system 77 and the additional pole b, and thus will tend to keep the moving system at zero.

From the dynamo, rotated from the propeller shaft, the current flows into the additional winding II of electromagnets 75 and returns back through the resistance Rz. The coils are connected, so that the tips 75 and pole 6 are magnetized in the same way. At low speeds of the propeller shaft, when the dynamo voltage is low, the magnetization of one pole will increase and the other will weaken. At some point, at a certain voltage, the magnetization of the pole doubles, and the other disappears (demagnetized), and with a larger increase in voltage, the tips of the poles will be magnetized oppositely and, with a good energy, will pull the rope system 77

 2

The speed of rotation of the propeller shaft will depend on the voltage of the Hinomachine r on the magnitude of the voltage — the deviation of the arrow of the moving system to a particular angle. If the machine shaft moves to the right, the pointer arrow will deflect in one direction, if the machine shaft rotates to the left, the pointer arrow will also change movement and show the reverse movement of the shaft.

The subject matter of the invention.

An electric speed indicator, rotatable from the ship's propeller shaft, is different in that electromagnets are used to create a constant magnetic field, powered by current from the ship's electrical circuit in series with the movable pointer system 77, in which the device electromagnets 75 are facing poles of the same name to each other, and for the closure of their magnetic circuits, in order to obtain a stable position of the mobile system 77 at zero, an additional one is applied, symmetrically located 1 | omagnitam 75, the pole 6, for generating the varying depending on the progress of a ship the velocity field magnets 75 are provided by additional windings II, fed from the rotatable shaft and the propeller creating a dynamo on the facing ends of different polarity.

Fig

Fig 2

Fig.Z

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