JPS5957130A - Power recovery type power measuring apparatus - Google Patents

Abstract

PURPOSE:To achieve the recovery of energy generated from a test motor, by a method wherein a star gear type speed reducing or speed increasing apparatus is used to measure the output of the motor connected to the input shaft of said apparatus and the electric output thereof is returned to an independent or a general power line. CONSTITUTION:A motor 1 to be subjected to capacity measurement is supported by a motor support stand 2 and constituted so as to rotate an induction dynamo or a synchronous dynamo 13 through couplings 3, 3' and a star gear type speed reducer (or a speed accerelator) 5 by a rotary speed NG slightly faster than the synchronous speed thereof and torque TG. In this case, the speed reducing ratio R(or the speed increasing ratio) of the test rotary number N of the motor is selected so as to obtain an almost definite rotary number NG. By this method, the output characteristics of the motor can be measured in an almost definite rotary number while the recovery of the motor output is attained.

Description

Detailed Description of the Invention In general, when measuring the output characteristics of a prime mover, or when performing a complete or sampling inspection of a large number of production prime movers at the end of a production line, conventionally, hydraulic dynamometers or osmotic current electric dynamometers are used. The energy generated by the prime mover is just wasted. If the number of prime movers produced is large and the output is particularly large, the amount of energy generated will be extremely large.
It is uneconomical to throw away this waste as heat.

The purpose of the present invention is to provide a means to solve this problem, and in addition to measuring the performance of the prime mover, almost all of the generated power is sent back to the power transmission line as electrical energy. ◎ In Fig. 1, the prime mover 1 whose performance is to be measured is supported by the prime mover support stand 2, and the coupling 3.3'
The induction generator or synchronous generator 13 is rotated through a planetary gear type reducer (or speed increaser) 5 at a rotational speed NG% (NG%) greater than its synchronous speed. FIG. 1 shows a case where a speed reducer is used, in which a thick 11# gear 7 is rotated via a high-speed shaft 4, and three to several planetary gears 9,9' that mesh with this gear are rotated. The planetary gears 9 and 9' mesh with a fixed ring gear 10 fixed at a fixed angle in the casing 5, and as they revolve inside the ring gear 12, the planetary gears 9 and 9' rotate supported by bearings 6' and transmit their output to the induction generator 13. The casing 5 is mounted on a support base 12.12 via bearings 11°11'.
Zs: Number of teeth of sun gear Ds: Pitch circle diameter of sun gear Zf: Number of teeth of fixed ring gear Df: Pitch of fixed ring gear M: Gear module diameter N: Reduction Machine input shaft rotation speed NG: If the output shaft rotation speed for reduction is taken as the reduction ratio R of this reduction gear, the torque acting on the casing 5 to which the fixed ring gear IO is attached is T, then Tf = r) 7T = (
2) T,; Torque acting on sun gear 7 TG: Torque acting on disk arm 4 (reducer output shaft torque) TG=・-(Ts + Tr) = (1+
γη)T, (8) The output of the prime mover is, 2ffN'l"271'NTs = useful (.

1-■Flat 45-4500rη The torque Tf applied to the casing 5 is L (E) from the shaft center
By measuring the load W- applied to the force application point of the torque arm at the point using a load cell, etc., Tl=WL @2/r
NWLNW (6) Sentence -450
0rη−4500rη o --= 716XJ (?
)1-L L By measuring N and Tf or N and W, the prime mover output can be measured from the (Xun equation or equation (6). (4)
) can be determined experimentally by measuring TG and T[ of equation (8) at the same time to obtain Ts, and using this and equation (2).

The output shaft 12 of the reducer rotates an induction generator or a synchronous generator 13 at a rotational speed NG and a torque TG, and the generated power is connected to a power line 18 via a switch metal box 15 and is recovered and used as a power load 19. At this time, it may be returned to the general power line, but if this is not allowed, connect the diesel engine 16 to the power line of a private power generator such as a three-phase alternating current generator 17, and use the induced or synchronous generator to generate the excitation current. The zero-induction generator that needs to be supplied to the motor 13 absorbs and generates maximum power when the synchronous rotational speed is +3 to 4 degrees higher than the slip.

In this way, the test rotational speed N and reduction ratio R (or speedup ratio) of the prime mover must be selected so that the rotational speed is approximately constant (NG). In the case shown in the figure, if the reduction ratio R is constant, the test rotation speed N of the prime mover cannot be arbitrarily selected, and N=R.
NG (in the case of speed increase, N=NG/几) is limited to a range of approximately constant rotational speed.

If it is necessary to measure the performance of the prime mover when N is varied over a wider range, as shown in FIG. In addition, some kind of variable transmission device, such as a continuously variable transmission, torque
Continuously variable transmission 2 so that even if a converter 21 is installed and N is changed, N is always kept at a constant value higher than the synchronous rotation speed.
All you have to do is change the gear ratio of 1.

By using the power recovery type dynamometer as described above, while recovering the prime mover output, it is possible to measure the rotation speed at a constant y in Fig. 1 and within a certain rotation speed range in the case of Fig. 2. It is possible to measure the output characteristics of the prime mover.

[Brief explanation of the drawing]

Figure 1 shows power measurement to determine the prime mover output by measuring the torque and rotational speed on the casing of a planetary gear type transmission with the casing floating while recovering power using the induction generator or synchronous generator of the present invention. Figure 2 is a vertical cross-sectional view of the device, and for the purpose of expanding the rotation speed range of power measurement, a planetary gear house with a fixed gear ratio is installed between the power measurement device and the induction or synchronous generator, and another continuously variable speed. Explanatory outline drawing when installing the device

Claims (1)

[Claims] 1. Using a planetary gear type reduction or speed increaser with a floating casing, the output of the prime mover connected to its input shaft is measured, and at the same time, an induction 4-voltage generator or synchronous generator is connected to the output shaft. A power recovery type power measuring device characterized by recovering the energy generated by the test prime mover by connecting the motors and returning the electric output to the own line of force or to the line of force. The power recovery connection according to claim 1, characterized in that the range of the output test rotation speed of the prime mover is expanded by connecting an infinitely variable transmission device between the transmission device and the induction or synchronous generator. Power measurement device.