SU87353A2 - Device for measuring power transmitted by a rotating shaft - Google Patents

Description

BASIC Auth. St. N ° 74574 describes a device for measuring the power not being rotated by a rotating shaft and determined but not the voltage of the generator connected to this shaft and the angle of twist of the shaft. The angle of twist of the shaft is determined by the change in inductance of the coils which are stationary and included in the bridge circuit, in which the magnetic gaps of the magnetic circuit change due to the relative change of the parts of the magnetic core rigidly connected to the rotating shaft. The parts of the magnetic core placed on the rotary shaft are composed of pz rods or a plate} pz of magnet material arranged parallel to the shaft axis and to each other and fastened through one in different shaft sections that are distant from each other.

The subject of this invention is the modification of said device, from which it differs by the location of the torque indicator on the disrupting shaft.

FIG. 1 is a schematic diagram of the construction of the proposed device; in fig. 2 is not located on the shaft torque indicator; in fig. 3-circuit device.

On a controlled shaft / there is an indicator 2 of a cool moment of it. This indicator consists of two throttles 3}} 4 with four coils 5-8 and with a common wheel 9 located between the poles of the chokes. The throttles and measles are fixed on the shaft 1 in different sections with the help of knives 10 and 11.

The measuring coils 5-8 are included in the shoulders of the bridge. The latter is carried out from an independent alternating current generator J2 located on the axis of the engine being monitored. Elekt1).) Engine 87353-2 is a driving force 1; its control is proportional to the engine speed. The supply voltage is applied to the bridge through a rotating transformer.

The stationary (stator) part of the transformer is a magnetic circuit 13 with a fixed primary ring coil 15. The rotating (rotary) part of the transformer is a ring 1 magnetic circuit 14 with a secondary ring coil 16.

In the absence of a torque, the bark 9 is located symmetrically between the throttles and the inductances of the katugiacs 5–8 are the same. The bridge is balanced.

When a torque occurs, the measles .9 approaches one of the chokes, the inductances of coils 5 and 7 become unequal to the inductances of coils b and 8, an imbalance of the bridge occurs and a current appears in its diagonal through the second rotating transformer / 7-20 (similar to the device transformer 13- / b) is fed to the rectifier 21 and then to the indicator-magnetoelectric device 22. The current in the diagonal of the bridge will be proportional to the measured power.

In order for the shaft not to serve as a common magnetic core for rotating transformers, it is shielded by a magnetic shield 23. The stator parts 13, 15 and П, 19 transformers are fixed on the crankcase of the motor under test. The device is closed by a casing 24.

The proposed device can also be used without measuring changes as a measuring torque, if the circuit is supplied with a current of a stabilized frequency. When the frequency is stabilized with an accuracy of 2%, the error of frequency change does not exceed 1%.

The separation of the power source (generator) and indicator part allows one to have enough power to effectively combat possible temperature (from changes in the resistance of solid rectifiers and copper in the circuit) and frequency errors. In addition, the proposed device makes it possible to directly measure MoiuHOCTH without contact (brush) current collection and amplifier

Subject invention

Modifying a device for measuring the power transmitted by a rotating shaft according to the ed. St. I 74574 using a transformer coupling between fixed - (AC source and measuring device) and rotating parts, characterized in that the measuring coils connected in the bridge circuit are located on the rotating frame.