CN2270967Y

CN2270967Y - Electric machine output torgue measurer

Info

Publication number: CN2270967Y
Application number: CN 94215962
Authority: CN
Inventors: 王曰进; 戴学信; 程海锋
Original assignee: HAIMEN ELECTRONIC INSTRUMENT FACTORY ZHEJIANG
Current assignee: HAIMEN ELECTRONIC INSTRUMENT FACTORY ZHEJIANG
Priority date: 1994-06-19
Filing date: 1994-06-19
Publication date: 1997-12-17
Anticipated expiration: 2004-06-19

Abstract

The utility model relates to an electric machine output torque measurer which is composed of a shift fork or a shift lever of a brake and a force measuring sensor. The sensor is arranged on a base plate of a dynamometer which is arranged far from heat source, the shift fork or the shift lever is arranged at the rear part of a brake of the dynamometer, and the head part of the sensor is provided with a movable supporting point or a shaft bearing. Because the sensor of the measurer is arranged on the base plate, etc. which are arranged far from the heat source, the heating temperature rise of the sensor is small, and temperature drift is also small, the testing precision can be improved.

Description

The motor output torque measurement mechanism

The utility model relates to a kind of motor output power measurement instrument, i.e. motor output torque measurement mechanism.

In known motor output torque measuring instrument, torque is normally by the rotor in the motor-driven detent, damping force with detent detects, the element that detects adopts force cell (promptly posting resistance strain gage on the strain beam of sensor) usually, the size of power is that the size by dependent variable is converted into electric signal, in known dynamometer machine, sensor is installed in the rear portion of detent often, as shown in Figure 1, mainly there are following two shortcomings: one, by the output power of measured motor is that detent by dynamometer machine is consumed, become heat after the consumption, because of sensor is positioned on the rear portion of detent, too near from thermal source, cause the marked change of sensor temperature, sensor generation temperature is floated, cause the output electric signal misalignment, influence accuracy of detection; Two, when sensor is heated, its length L changes, because of the temperature rise of frame little, size is more stable, therefore also changing apart from M of force-detecting position D place separated in the Response Division of sensor, the variation of M causes the dependent variable of strain beam to change, and has caused the misalignment of output electric signal, thereby has also influenced its accuracy of detection.

The purpose of this utility model is to provide a kind of motor output torque measurement mechanism at above-mentioned situation.

The purpose of this utility model realizes in the following manner: a kind of motor output torque measurement mechanism, constitute by detent shift fork or driving lever and force cell, sensor is installed on the base plate of thermal source dynamometer machine at a distance, shift fork or driving lever are positioned on the detent rear portion of dynamometer machine, at the head of sensor moving fulcrum or bearing are installed.

Measurement mechanism of the present utility model is because sensor is positioned on thermal source base plate at a distance etc., and the sensor temperature rise of being heated is little, and it is also little that temperature is floated, thereby its measuring accuracy improves greatly.

Below in conjunction with accompanying drawing technology contents of the present utility model and architectural feature thereof are further described:

Fig. 1 is the structural representation of existing dynamometer machine;

Fig. 2 is the scheme of installation of existing sensor, and promptly synoptic diagram is looked on Fig. 1 left side;

Fig. 3 is the sensor scheme of installation in the dynamometer machine of the present utility model;

The partial structurtes synoptic diagram that Fig. 4 installs for sensor.

Number in the figure: 1, by measured motor 2, shaft coupling

3, axle 4, detent front end end cover

5, rotor (rotor cup) 6, braking body

7, detent bearing shelves 8, frame

9, sensor 10, dynamometry fulcrum (D point)

11, base plate 12, shift fork or driving lever

13, fulcrum or bearing

Referring to Fig. 1,2, in the prior art, linked to each other with axle 3 by shaft coupling 2 by measured motor 1, braking body 6 matches with rotor 5 on the axle 3, is equipped with detent front end end cover 4 on braking body 6, and detent front end end cover 4 is installed on the frame 8 by bearing etc., rear portion at braking body 6 is equipped with detent bearing shelves 7, detent bearing shelves 7 also by Bearing Installation on frame 8, sensor 9 is positioned on the detent bearing shelves 7, by the sensor test motor.

Referring to Fig. 3 and Fig. 4, motor output torque measurement mechanism of the present utility model, constitute by detent shift fork or driving lever 12 and force cell 9, sensor 9 is installed on the base plate 11 of thermal source than the distant place dynamometer machine, also but Lou is contained on frame or other body, the detent rear portion that the method for shift fork or the former peace sensor of driving lever 12 usefulness is positioned on dynamometer machine is on the detent bearing shelves, at the head of sensor moving fulcrum or bearing 13 is installed; When test, its damping force is passed to sensor with shift fork or driving lever.

Referring to Fig. 3 and Fig. 4, because sensor 9 is positioned on from thermal source at a distance, on base plate or frame or other parts, the sensor that reflects among the figure is positioned on the brake backing plate 11, and shift fork or driving lever 12 are installed in the position of the detent rear portion original sensor of dynamometer machine, stirs the strain beam of sensor during test with shift fork or driving lever 12, make it output signal, thereby the temperature rise of sensor is little, and its temperature is floated also and greatly reduced, and has improved its accuracy of detection greatly.And, also can offset a part each other and change because the frame temperature rise is little, and the axle center of shift fork or driving lever 12 is also little from the variation of the size H of sensor installation place, and the temperature rise of sensor is little, and its length variations is little, and both temperature rises are more approaching; And the grand change beam head at sensor is provided with moving fulcrum or bearing 13, detent adstante febre when dynamometer machine, the length variations that causes shift fork or driving lever to be heated and take place, because size H is more stable, so the sensor fulcrum is also more stable from the size B of shift fork or driving lever, has correspondingly improved its accuracy of detection.

Claims

1, a kind of motor output torque measurement mechanism, constitute by detent shift fork or driving lever and force cell, it is characterized in that: sensor 9 is installed on the base plate 11 of thermal source dynamometer machine at a distance, shift fork or driving lever 12 are positioned on the detent rear portion of dynamometer machine, at the head of sensor moving fulcrum or bearing 13 are installed.