CN210893499U - Novel dynamometer - Google Patents

Abstract

The utility model discloses a novel dynamometer, which comprises a fixing mechanism, a stator shell, a rotor, an end cover, a bearing, a rotating speed measuring device and a torque measuring device; the fixing mechanism comprises a bottom plate, a supporting seat and a mounting seat; the end cover comprises a front end cover and a rear end cover; the fixing mechanism supports other structures, the stator shell is fixed on the fixing mechanism, the stator is arranged in the stator shell, and the rotor is connected with the supporting seat and the mounting seat through a bearing; the rotating speed measuring device is arranged on the rotor rotating shaft, is connected with the rear end cover through a connecting piece and is used for measuring the rotating speed; the torque measuring device is arranged on the mounting seat and connected with the stator to measure torque. The utility model has the advantages of convenient use, high automation degree, safety and reliability.

Description

Novel dynamometer

Technical Field

The utility model relates to a survey power technical field, more specifically the theory that says so, it relates to a novel dynamometer machine.

Background

The dynamometer can be used for testing the torque, the rotating speed and the like of the motor, can also be used for detecting the delivery of motor products on a production line, and can be used for testing all performance curves of the motor from no load to locked rotor. The method comprises the following steps of detecting conditions such as input voltage, current, power and the like while testing the performance of a motor at no-load and load points; therefore, production research personnel can better master the parameters and the use condition of the motor, and improvement measures can be conveniently made. The conventional dynamometer (consisting of a loading machine, a rotary torque and rotation speed sensor and a coupling) senses the torque of a motor through a sensor, and the precision of the conventional dynamometer depends on the measurement precision of the sensor and the installation precision of the front coupling and the rear coupling of the sensor; in addition, the conventional dynamometer has a complex structure, excessive auxiliary parts and is not easy to install and maintain; the structure is not compact and is bulky.

SUMMERY OF THE UTILITY MODEL

The utility model overcomes prior art's is not enough, provides a novel dynamometer, its reasonable in design, convenient to use, and data is accurate.

The technical scheme of the utility model is as follows:

a novel dynamometer belongs to a suspension type structure and comprises a fixing mechanism, a stator shell, a rotor, an end cover, a bearing, a rotating speed measuring device and a torque measuring device; the fixing mechanism comprises a bottom plate, a supporting seat and a mounting seat; the end cover comprises a front end cover and a rear end cover; the fixing mechanism supports other structures, the stator shell is fixed on the fixing mechanism, the stator is arranged in the stator shell, and the rotor is connected with the supporting seat and the mounting seat through a bearing; the rotating speed measuring device is arranged on the rotor rotating shaft, is connected with the rear end cover through a connecting piece and is used for measuring the rotating speed; the torque measuring device is arranged on the mounting seat and connected with the stator to measure torque.

Further, the rotating speed measuring device comprises a rotary encoder and a grating disc; the upper part of the rotary encoder is disc-shaped, and the lower part of the rotary encoder is a connecting column; a round hole is formed in the center of the upper part of the rotary encoder, and a rotor rotating shaft penetrates through the round hole; the grating disc is disc-shaped; the edge of the grating disk is provided with rectangular holes which are radial and arranged at intervals, and the rectangular holes are uniformly distributed by taking the center of the grating disk as the center; the center of the grating disk is provided with a circular boss, the center of the boss is provided with a round hole, and the rotor rotating shaft penetrates through the round hole.

Further, the torque measuring device comprises a sensor, a needle bearing and a stress shaft; the sensor is rectangular, the middle of the sensor is hollowed out, and the hollowed-out shape is rectangular; the front surface and the rear surface of the hollowed-out part of the sensor are respectively covered with a rectangular plate; a bolt connecting piece is arranged on the left side of the sensor; a needle bearing is arranged at the hollow part in the center of the stress connecting piece, and a stress shaft is arranged in the middle of the needle bearing; one end of the stress shaft is arranged on the needle roller bearing, the other end of the stress shaft penetrates through the round hole in the corresponding position of the mounting seat, and the rear end cover is connected with the stator after passing through the round hole in the corresponding position of the rear end cover.

Further, the bearings comprise a first deep groove ball bearing, a second deep groove ball bearing, a third deep groove ball bearing and a fourth deep groove ball bearing; the fixing mechanism also comprises a mounting seat cover plate; the upper half part of the supporting seat is semicircular, the lower half part of the supporting seat is rectangular, and the connecting part is in smooth transition; the center of the front of the upper half part of the supporting seat is sunken, and a circular hole is formed in the center of the sunken part; the left side and the right side of the bottom of the supporting seat are provided with connecting holes which are connected with the bottom plate through bolts; the back of the upper half part of the supporting seat is hollowed out, and the hollowed-out shape is circular; a circular table is arranged at the center of the hollow part, and a circular hole is formed in the center of the circular table; the side surface of the supporting seat is provided with a ventilation opening, and the ventilation opening is connected with the hollow part at the back surface of the supporting seat.

Furthermore, the front end cover is circular, a circular table is arranged at the center of the front end cover, and a circular hole is formed in the center of the circular table and is adaptive to the size of a rotor rotating shaft; the front edge of the front end cover is provided with a first annular baffle, and the front end cover is provided with ventilation round holes which are uniformly distributed along the inner side of the annular baffle; a second annular baffle plate is arranged in the middle between the circular truncated cone on the front face of the front end cover and the first annular baffle plate; the first annular baffle plate and the second annular baffle plate are in a step shape; a third annular baffle is arranged on the back surface of the front end cover at a position corresponding to the second annular baffle, and the section of the third annular baffle is rectangular; the first deep groove ball bearing is arranged between the supporting seat and the rotor rotating shaft, and the second deep groove ball bearing is arranged between the front end cover and the rotor rotating shaft.

Further, the stator shell is cylindrical and hollow, and the stator is arranged inside the stator shell; the stator shell is provided with uniformly distributed ventilation round holes which correspond to the ventilation round holes on the edge of the front end cover one by one; the front first annular baffle of front end housing, the corresponding position depressed place in the back of supporting seat of second annular baffle buckle, the third annular baffle outer fringe buckle at the front end housing back is at the interior border of stator shell.

Further, the whole stator is cylindrical and hollow inside; the middle part of the outer surface of the stator is raised, and the inner edge of the third annular baffle is buckled on the inner edge of the stator; the outer edge of the stator is fixed on the inner edge of the stator shell; the rotor is a stepped cylinder and comprises a main rotating shaft, a first rotating shaft, a second rotating shaft, a third rotating shaft, a fourth rotating shaft, a fifth rotating shaft and a sixth rotating shaft; the diameter of the main rotating shaft is the largest, the diameter of the first rotating shaft is smaller than that of the second rotating shaft, and the first rotating shaft and the second rotating shaft are arranged in front of the main rotating shaft; the third rotating shaft, the fourth rotating shaft and the fifth rotating shaft are arranged behind the main rotating shaft, and the diameters of the third rotating shaft, the fourth rotating shaft and the fifth rotating shaft are sequentially reduced; the tail end of the fifth rotating shaft is provided with wave-shaped grains; the main rotating shaft is arranged inside the stator; the rear end cover is arranged at the rear side of the rotor, and a circular hole is formed in the center of the rear end cover; and the third rotating shaft is connected with a round hole in the center of the rear end cover through a third deep groove ball bearing.

Furthermore, the rear end cover is integrally circular, an annular boss is arranged around the central circular hole, and four semicircular holes are formed in the upper part of the annular boss; a fourth annular baffle is arranged in the middle of the front surface of the rear end cover, six rib plates are arranged on the outer side of the fourth annular baffle, the rib plates are uniformly distributed around the circle center of the rear end cover, and the distance between every two adjacent rib plates is 60 degrees; the rib plates are respectively provided with a connecting round hole; the rear surface of the rear end cover is provided with a step round table around the round hole.

Furthermore, the mounting seat is arranged at the rear side of the rear end cover, the shape of the mounting seat is the same as that of the supporting seat, and a round hole is formed in the center of the upper part of the mounting seat and is connected with a fourth rotating shaft through a fourth deep groove ball bearing; a bearing end cover is arranged at the rear side of the fourth deep groove ball bearing and fixed at the hollowed-out position of the back of the mounting seat; the right side of the back of the mounting seat is hollowed out, and the shape of the hollowed-out part is matched with that of the torque measuring device; a rectangular hole is formed in the left side of the back of the mounting seat, and a wiring bar is mounted in the rectangular hole; a stepped ring is arranged around the central circular hole at the back of the mounting seat, and a bearing end cover is fixed; a step-shaped circular table is arranged at the center of the upper circle; the mounting seat cover plate is arranged at the rear part of the mounting seat.

This practicality compares prior art advantage and lies in:

1. the utility model has the advantages of reasonable structure, convenient manufacture, compact structure, small moment of inertia, low vibration and noise and convenient popularization and use.

2. The utility model discloses moment survey device, its stress point is the contact of axial circle face with the plane, guarantees when the stator that the arm of force variable volume of test can be ignored when the atress to guarantee higher torque measurement accuracy.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and not to limit the invention. In the attached drawings

FIG. 1 is a three-dimensional view of the overall structure of the novel dynamometer of the present invention;

FIG. 2 is a cross-sectional view of the dynamometer according to the present invention;

FIG. 3 is a radial cross-sectional view of the novel dynamometer of the present invention;

FIG. 4 is an exploded view of the dynamometer of the present invention;

FIG. 5 is a schematic structural view of a rotation speed measuring device of a dynamometer according to the present invention;

the figure is marked with: the device comprises a supporting seat 1, a mounting seat 2, a stator shell 3, a bottom plate 4, a front end cover 5, a rear end cover 6, a first deep groove ball bearing 7, a second deep groove ball bearing 8, a third deep groove ball bearing 9, a fourth deep groove ball bearing 10, a bearing end cover 11, a stator 12, a rotor 13, a torque measuring device 14, a rotating speed measuring device 15, a mounting seat cover plate 16, an encoder 17, a rotary weaving fixing piece 18, a grating disc 19, a stress connecting piece 20, a stress shaft 21, a needle bearing 22, a fixing screw rod 23 and a sensor 24.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

As shown in fig. 1 to 5, the novel dynamometer includes a fixing mechanism, a stator 12, a stator housing 3, a rotor 13, an end cover, a bearing end cover 11, a bearing, a rotation speed measuring device 15, and a torque measuring device 14. The fixing mechanism comprises a bottom plate 4, a supporting seat 1 and a mounting seat 2. The end cap comprises a front end cap 5 and a rear end cap 6. Other structures are supported by the fixing mechanism, the shell 3 of the stator 12 is fixed on the fixing mechanism, the stator 12 is arranged inside the shell 3 of the stator, and the rotor 13 is connected with the supporting seat 1 and the mounting seat 2 through bearings. The rotating speed measuring device 15 is arranged on the rotating shaft of the rotor 13 and is connected with the rear end cover 6 through a connecting piece to measure the rotating speed. The torque measuring device 14 is provided on the mount 2, connected to the stator 12, and measures torque.

Preferably, the rotation speed measuring device 15 includes a rotary encoder 17, a rotary encoder holder 18, a grating disk 19, and a grating disk joint. The grating disk 19 comprises a rotary encoder 17, the upper part of which is in a disk shape, and the lower part of which is a connecting column. The center of the upper part of the rotary encoder 17 is provided with a round hole through which the rotating shaft of the rotor 13 passes. The rotary encoder 17 is fixed to the rotary encoder fixing member 18. The rotary knitting fixing piece 18 is of an annular structure, and a notch is formed in the lower right corner; the rotary encoder fixing piece 18 can enhance the connection strength of the rotary encoder 17, and avoid the phenomenon that instability occurs in the measuring process to influence the final result measurement. The rotary-knitting fixing piece 18 is connected with a grating disk joint which is in a concave shape and comprises a joint front plate, a joint rear plate and a joint bottom plate 4. Two sides of the joint front plate are respectively provided with a connecting plate with a round hole; the joint front plate is located at the notch of the lower right corner of the rotary-knitted fastener 18. The grating disk joint is used for protecting the rotary-knitting fixing piece 18, and the grating disk 19 is in a disk shape. The grating disk 19 is provided with rectangular holes arranged radially and at intervals on the edge, and the rectangular holes are uniformly distributed by taking the circle center of the grating disk 19 as the center. The rectangular holes leak light to assist the rotary encoder 17 in determining the rotational speed. The center of the grating disk 19 is provided with a circular boss, the center of the boss is provided with a circular hole, and the rotating shaft of the rotor 13 passes through the circular hole. The lower right hand corner of the grating disk 19 passes through the front and rear joint plates and is located above the joint bottom plate 4. In the embodiment of the present utility model, grating disk 19 is directly connected with the rotor shaft, when the rotor rotates, drives grating disk 19 and rotates, and the radial rectangular hole on grating disk 19 can produce periodic motion to produce the change of luminosity, rotary encoder 17 receives this kind of signal, obtains the rotational speed of pivot according to the change situation of luminosity. Compared with a rotating speed measuring device on a conventional dynamometer, the scheme of the utility model has the advantages of quicker response and low environmental interference degree.

Preferably, the torque measuring device 14 includes a fixing screw 23, a sensor 24, a force receiving connector 20, a needle bearing 22, and a force receiving shaft 21. The stressed connecting piece 20 is rectangular in shape, hollow in the middle, and rectangular in hollow shape. The fixing screw 23 includes an upper fixing screw and a lower fixing screw. The stress connecting piece 20 is connected with the sensor 24 through an upper fixing screw rod, and the sensor 24 is connected with the lower part of the mounting seat 2 through a lower fixing screw rod; the sensor 24 is rectangular, the middle of the sensor is hollow, and the hollow shape is rectangular; the front and back surfaces of the hollow-out position of the sensor 24 are respectively covered with a rectangular plate. A bolt connecting piece is arranged on the left side of the sensor 24; the hollow part in the center of the stress connecting piece 20 is provided with a needle bearing 22, and the middle of the needle bearing 22 is provided with a stress shaft 21. In this embodiment, the contact surface between the needle bearing 22 and the stressed connector 20 is in a contact form of a circular surface and a plane, while the conventional dynamometer adopts a contact form of a circular surface and a circular surface, the contact of the circular surface and the plane can ensure that the stressed point is the contact position of an upper plane or a lower plane and a circular tangent plane, the position of the stressed point is fixed, and the length of the force arm is kept unchanged, thereby ensuring the precision of the torque; conventionally, the contact form of the round surface and the round surface is limited by the round surface when stressed, and the processing precision of the bearing can cause that any point of the round surface can be a stress point, thereby increasing the measurement error. The contact form of the circular surface and the plane is adopted, so that the accuracy of the moment numerical value can be ensured to the maximum extent. According to the formula T ═ N × L

(T: moment, N: force, L: moment arm) can be known, and when the force magnitude and the distance of the moment arm are determined, the moment can be calculated. In the embodiment, because a circular surface and plane contact mode is adopted, the force is easy to determine, the length of the force arm is kept unchanged, and therefore, an accurate moment value can be obtained. The structure ensures that the variable quantity of the distance from the stress point to the center of the motor shaft is minimum, namely the variable quantity of the force arm is minimum, thereby ensuring that the measured force is in direct proportion to the torque of the measured motor (ensuring the precision of the torque by ensuring the precision of the force). One end of the stress shaft 21 is arranged on the needle bearing 22, the other end of the stress shaft passes through a round hole at the corresponding position of the mounting seat 2, and the rear end cover 6 is connected with the stator 12 after passing through the round hole at the corresponding position of the rear end cover. The fixing screw 23 is tightly connected with the rear end cover 6 through a bolt, so that the stability is improved, and the problem of inaccurate measurement caused by vibration in the power measurement work is avoided. The stress shaft 21 is directly connected with the stator 12, so that intermediate links are reduced, the accurate measurement capability of the torque is improved, and the reliability and accuracy of the obtained data are ensured. The stress shaft 21 is connected with the needle bearing 22 and the stress connecting piece 20, so that the transmission direction of the moment is changed, the sensor 24 can be fixed on the mounting seat 2 in a more compact mode, the space is saved, and the accuracy of measured data is ensured.

Preferably, the bearings include a first deep groove ball bearing 7, a second deep groove ball bearing 8, a third deep groove ball bearing 9, and a fourth deep groove ball bearing 10. The fixing mechanism also comprises a mounting seat 2 cover plate. The upper half part of the supporting seat 1 is semicircular, the lower half part of the supporting seat is rectangular, and the connecting part is in smooth transition, so that the stress is reduced. The center of the front of the upper half part of the supporting seat 1 is sunken, a circular hole is arranged at the center of the sunken part, and connecting holes are arranged at the left side and the right side of the bottom of the supporting seat 1 of the rotor 13 and are connected with the bottom plate 4 through bolts. The back of the upper half part of the supporting seat 1 is hollowed out, and the hollowed-out shape is circular; the center of the hollow part is provided with a round table, and the center of the round table is provided with a round hole. The side of the supporting seat 1 is provided with a ventilation opening, and the ventilation opening is connected with the hollow part at the back of the supporting seat 1. The ventilation opening is connected with an external fan. Conventional dynamometer device has integrateed fan and motor body, and fan and motor body separation use the mode of external air-blower in this practicality to guarantee that the dynamometer machine is compacter, avoided producing vibrations in the fan use simultaneously and lead to the inaccurate problem of final measurement. In addition, the problem of inaccurate centering is easily caused when the fan is installed, and the final measurement precision is influenced. The front end cover 5 is circular, a circular truncated cone is arranged at the center of the front end cover, and a circular hole is formed in the center of the circular truncated cone and is matched with the rotating shaft of the rotor 13 in size. The front edge of the front end cover 5 is provided with a first annular baffle, and ventilation round holes which are uniformly distributed are arranged on the front end cover 5 along the inner side of the annular baffle. A second annular baffle plate is arranged in the middle between the circular truncated cone on the front surface of the front end cover 5 and the first annular baffle plate; the first annular baffle and the second annular baffle are both in a step shape. And a third annular baffle is arranged on the back surface of the front end cover 5 at a position corresponding to the position of the second annular baffle, and the section of the third annular baffle is rectangular. First annular baffle, second annular baffle, third annular baffle help buckle other parts, improve holistic intensity. The first deep groove ball bearing 7 is arranged between the support seat 1 and the rotor 13 rotating shaft, and the second deep groove ball bearing 8 is arranged between the front end cover 5 and the rotor 13 rotating shaft; the stator 12 shell 3 is cylindrical and hollow, and the stator 12 is arranged inside the stator 12 shell 3; the shell 3 of the stator 12 is provided with uniformly distributed ventilation round holes which are in one-to-one correspondence with the ventilation round holes at the edge of the front end cover 5; the front first annular baffle of front end housing 5, the corresponding position depressed place in the back of supporting seat 1 is buckled to the second annular baffle, and the interior border of stator housing 3 is buckled to the third annular baffle outer fringe buckle at the front end housing 5 back. The positions of the ventilation circular holes of the stator 12 and the front end cover 5 are in one-to-one correspondence, so that an air channel is formed and matched with the ventilation holes, and the air flow in the equipment is guaranteed. When the dynamometer works, external cooling air enters the air channel through the air vent, and along with the flowing of the cooling air, the cooling air drives hot air to flow and simultaneously cools the stator 12, the rotor 13 and other components.

Preferably, the stator 12 is cylindrical as a whole and has a hollow interior. The middle part of the outer surface of the stator 12 is raised, and the inner edge of the third annular baffle is buckled on the inner edge of the stator 12. The outer edge of the stator 12 is fixed on the inner edge of the shell 3 of the stator 12; the rotor 13 is a stepped cylinder and comprises a main rotating shaft, a first rotating shaft, a second rotating shaft, a third rotating shaft, a fourth rotating shaft, a fifth rotating shaft and a sixth rotating shaft; the diameter of the main rotating shaft is the largest, the diameter of the first rotating shaft is smaller than that of the second rotating shaft, and the first rotating shaft and the second rotating shaft are arranged in front of the main rotating shaft; the third rotating shaft, the fourth rotating shaft and the fifth rotating shaft are arranged behind the main rotating shaft, and the diameters of the third rotating shaft, the fourth rotating shaft and the fifth rotating shaft are sequentially reduced; the tail end of the fifth rotating shaft is provided with wavy grains, so that the fifth rotating shaft is conveniently connected with the rotating speed measuring device 15, and the data accuracy of measurement is improved. The main shaft is disposed inside the stator 12. The rear end cover 6 is arranged at the rear side of the rotor 13, and a circular hole is formed in the center; the third rotating shaft is connected with a round hole in the center of the rear end cover 6 through a third deep groove ball bearing 9; the rear end cover 6 is integrally circular, an annular boss is arranged around the central circular hole, and four semicircular holes are formed in the upper part of the annular boss; a fourth annular baffle is arranged in the middle of the front surface of the rear end cover 6, six rib plates are arranged on the outer side of the fourth annular baffle, the rib plates are uniformly distributed around the circle center of the rear end cover 6, and the distance between every two adjacent rib plates is 60 degrees; the rib plates are respectively provided with a connecting round hole. The rear surface of the rear end cover 6 is provided with a step round table around the round hole; the mounting seat 2 is arranged at the rear side of the rear end cover 6, has the same shape as the supporting seat 1, is provided with a round hole at the center of the upper part and is connected with a fourth rotating shaft through a fourth deep groove ball bearing 10; a bearing end cover 11 is arranged at the rear side of the fourth deep groove ball bearing 10, and the bearing end cover 11 is fixed at the hollow-out position of the back of the mounting seat 2; the right side of the back of the mounting seat 2 is hollowed, and the shape of the hollowed-out part is matched with that of the torque measuring device 14; a rectangular hole is formed in the left side of the back of the mounting seat 2, and a wiring bar is mounted in the rectangular hole; a step-shaped circular ring is arranged around the central circular hole at the back of the mounting seat 2, and a bearing end cover 11 is fixed; a step-shaped circular table is arranged at the center of the upper circle; a mount cover 16 is provided at the rear of the mount 2. The mounting seat cover plate 16 covers the mounting seat 2, so that external oil stains and dust are prevented from entering.

This practicality is by asynchronous servo motor, encoder, draw pressure sensor, signal processing circuit and frame etc. to constitute, adopts motor stator suspension structure, utilizes reaction force to measure and gets load torque. Compared with the conventional servo motor power measuring device, the servo motor power measuring device has the advantages of compact structure, direct connection between the tested motor and the load motor, few intermediate connection transmission parts, no rotary torque and speed sensor, low connection loss, small rotational inertia and low vibration noise, and simultaneously, the measurement precision is greatly improved because the rotary torque is converted into the static torque for measurement. In addition, when the precision requirement is high, the external special torque sensor can be guaranteed only by an imported sensor at present, the price is extremely high, the general price is different from tens of thousands to hundreds of thousands, and the order period is long; the suspended dynamometer measurement device has much lower cost and can ensure the precision within 0.2 percent on the premise of reaching the same precision. When the torque and the rotating speed of the transmitter need to be measured, the rotating shaft of the motor is connected with the dynamometer rotor through the coupler, and after the motor is started, the rotating shaft of the motor rotates at the moment, and the dynamometer rotor rotates along with the rotating shaft.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the scope of the present invention, and these modifications and decorations should be regarded as being within the scope of the present invention.

Claims (9)

1. The utility model provides a novel dynamometer which characterized in that: the device comprises a fixing mechanism, a stator shell, a rotor, an end cover, a bearing, a rotating speed measuring device and a torque measuring device; the fixing mechanism comprises a bottom plate, a supporting seat and a mounting seat; the end cover comprises a front end cover and a rear end cover; the fixing mechanism plays a supporting role, the stator shell is fixed on the fixing mechanism, the stator is arranged in the stator shell, and the rotor is connected with the supporting seat and the mounting seat through a bearing; the rotating speed measuring device is arranged on the rotor rotating shaft, is connected with the rear end cover through a connecting piece and is used for measuring the rotating speed; the torque measuring device is arranged on the mounting seat and connected with the stator to measure torque.

2. The novel dynamometer machine of claim 1, characterized in that: the rotation speed measuring device comprises a rotary encoder and a grating disc; the upper part of the rotary encoder is disc-shaped, and the lower part of the rotary encoder is a connecting column; a round hole is formed in the center of the upper part of the rotary encoder, and a rotor rotating shaft penetrates through the round hole; the grating disk is disc-shaped.

3. The novel dynamometer machine of claim 1, characterized in that: the moment measuring device comprises a sensor, a needle bearing and a stress shaft; the sensor is rectangular, the middle of the sensor is hollowed out, and the hollowed-out shape is rectangular; the front surface and the rear surface of the hollowed-out part of the sensor are respectively covered with a rectangular plate; a bolt connecting piece is arranged on the left side of the sensor; a needle bearing is arranged at the hollow part in the center of the stress connecting piece, and a stress shaft is arranged in the middle of the needle bearing; one end of the stress shaft is arranged on the needle roller bearing, the other end of the stress shaft penetrates through the round hole in the corresponding position of the mounting seat, and the rear end cover is connected with the stator after passing through the round hole in the corresponding position of the rear end cover.

4. The novel dynamometer machine of claim 1, characterized in that: the bearings comprise a first deep groove ball bearing, a second deep groove ball bearing, a third deep groove ball bearing and a fourth deep groove ball bearing; the fixing mechanism also comprises a mounting seat cover plate; the upper half part of the supporting seat is semicircular, the lower half part of the supporting seat is rectangular, and the connecting part is in smooth transition; the center of the front of the upper half part of the supporting seat is sunken, and a circular hole is formed in the center of the sunken part; the left side and the right side of the bottom of the supporting seat are provided with connecting holes which are connected with the bottom plate through bolts; the back of the upper half part of the supporting seat is hollowed out, and the hollowed-out shape is circular; a circular table is arranged at the center of the hollow part, and a circular hole is formed in the center of the circular table; the side surface of the supporting seat is provided with a ventilation opening, and the ventilation opening is connected with the hollow part at the back surface of the supporting seat.

5. The novel dynamometer machine of claim 1, characterized in that: the front end cover is circular, a circular table is arranged at the center of the front end cover, and a circular hole is formed in the center of the circular table and is adaptive to the size of a rotor rotating shaft; the front edge of the front end cover is provided with a first annular baffle, and the front end cover is provided with ventilation round holes which are uniformly distributed along the inner side of the annular baffle; a second annular baffle plate is arranged in the middle between the circular truncated cone on the front face of the front end cover and the first annular baffle plate; the first annular baffle plate and the second annular baffle plate are in a step shape; a third annular baffle is arranged on the back surface of the front end cover at a position corresponding to the second annular baffle, and the section of the third annular baffle is rectangular; the first deep groove ball bearing is arranged between the supporting seat and the rotor rotating shaft, and the second deep groove ball bearing is arranged between the front end cover and the rotor rotating shaft.

6. The novel dynamometer machine of claim 1, characterized in that: the stator shell is cylindrical and hollow, and the stator is arranged in the stator shell; the stator shell is provided with uniformly distributed ventilation round holes which correspond to the ventilation round holes on the edge of the front end cover one by one; the front first annular baffle of front end housing, the corresponding position depressed place in the back of supporting seat of second annular baffle buckle, the third annular baffle outer fringe buckle at the front end housing back is at the interior border of stator shell.

7. The novel dynamometer machine of claim 1, characterized in that: the whole stator is cylindrical and hollow inside; the middle part of the outer surface of the stator is raised, and the inner edge of the third annular baffle is buckled on the inner edge of the stator; the outer edge of the stator is fixed on the inner edge of the stator shell; the rotor is a stepped cylinder and comprises a main rotating shaft, a first rotating shaft, a second rotating shaft, a third rotating shaft, a fourth rotating shaft, a fifth rotating shaft and a sixth rotating shaft; the diameter of the main rotating shaft is the largest, the diameter of the first rotating shaft is smaller than that of the second rotating shaft, and the first rotating shaft and the second rotating shaft are arranged in front of the main rotating shaft; the third rotating shaft, the fourth rotating shaft and the fifth rotating shaft are arranged behind the main rotating shaft, and the diameters of the third rotating shaft, the fourth rotating shaft and the fifth rotating shaft are sequentially reduced; the tail end of the fifth rotating shaft is provided with wave-shaped grains; the main rotating shaft is arranged inside the stator; the rear end cover is arranged at the rear side of the rotor, and a circular hole is formed in the center of the rear end cover; and the third rotating shaft is connected with a round hole in the center of the rear end cover through a third deep groove ball bearing.

8. The novel dynamometer machine of claim 1, characterized in that: the rear end cover is integrally circular, an annular boss is arranged around the central circular hole, and four semicircular holes are formed in the upper part of the annular boss; a fourth annular baffle is arranged in the middle of the front surface of the rear end cover, six rib plates are arranged on the outer side of the fourth annular baffle, the rib plates are uniformly distributed around the circle center of the rear end cover, and the distance between every two adjacent rib plates is 60 degrees; the rib plates are respectively provided with a connecting round hole; the rear surface of the rear end cover is provided with a step round table around the round hole.

9. The novel dynamometer machine of claim 1, characterized in that: the mounting seat is arranged at the rear side of the rear end cover, has the same shape as the supporting seat, is provided with a round hole in the center of the upper part and is connected with a fourth rotating shaft through a fourth deep groove ball bearing; a bearing end cover is arranged at the rear side of the fourth deep groove ball bearing and fixed at the hollowed-out position of the back of the mounting seat; the right side of the back of the mounting seat is hollowed out, and the shape of the hollowed-out part is matched with that of the torque measuring device; a rectangular hole is formed in the left side of the back of the mounting seat, and a wiring bar is mounted in the rectangular hole; a stepped ring is arranged around the central circular hole at the back of the mounting seat, and a bearing end cover is fixed; a step-shaped circular table is arranged at the center of the upper circle; the mounting seat cover plate is arranged at the rear part of the mounting seat.

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