SU12975A1 - Device for measuring shaft power - Google Patents

Description

The present invention relates to a device for measuring the power transmitted by the shaft from the motor to the receiver, and consists, according to the scheme, of two identical synchronous generators, whose rotors, made in the form of iron gear disks 2 and 5 with the same number of teeth, are stuck on the working shaft 1 at some distance from each other, and the stators 3 and 6, in the form of permanent magnets or electromagnets, are fixed and have windings 4 and 7 connected in series to meet each other. Recent adventures to the measuring device of alternating current (voltmeter), showing directly the power., Not repaired by the shaft.

When shaft 1 rotates, due to hisizenilic magnetic resistance, the magnitude of the fluxes induced by the stator windings 4 and 7 changes, and the latter generate a. 9. s. The rotors 2 and 5 and the windings 4 and 7 of both generators are identical, as a result of e. 9. E. Both generators have the same shape, the same amplitude and the same frequency.

The power, which is not shaken by the shaft, can be expressed through the angle a of the shaft tightening and the number of revolutions per second and so:

 (one)

Denote the instantaneous value 9. d. first generator through

e, j ;, Sin (wt - 9i) (2) and the second, respectively, through

 Sin (6) t -9j). . . (3) we obtain that:

her,

ZED (.) Sm (wt-Y) (4) Under our conditions E, E;

Ф.0

Then equation (4) after the corresponding transformations takes the form:

,, - / W- + + Cos fa Sin

i-) 2.Siii - Sin

2i I2i

(-f)

(5) The angle cpj is not more than 20 degrees, you can put in equation (5), 9, E- C, where p is the number of revolutions of the working shaft. Then the equation (5) takes the form: e - e., 2,, Sin (- 2 | -): - / C4% 92SinYoi -% -. . (8) /, Between the angle tpj and the angle a of the shaft twist, there is a relationship: where p is the number of teeth of the rotor 5. In the equation (8) the expression “PJ through a, we get: e, - e, .SgIi s -) - C, na, 8in {ttt -. . (10) The effective value of such a sinusoidal function will be: Q: n a: Comparing equation (11) with equation (1), we see that. . Therefore, the measuring device 8 can be calibrated directly to the power transmitted by the shaft 1. Item on the awning a. A device for measuring shaft power, characterized by the use of two identical synchronous generators, whose rotors in the form of iron gear disks 2 and 5 with the same number of teeth are wedged on the working shaft 1 at some distance from each other, and the stators 3 and 6 in the form of magnets or electromagnets, excited by a constant-current current, are fixed above the teeth of the respective rotors and are provided with windings 4 and 7 connected in series and against each other and connected to flax AC device 8 serving as reference for direct power transmitted by the shaft.