CN210761147U

CN210761147U - Torque sensor for moped

Info

Publication number: CN210761147U
Application number: CN201921628504.2U
Authority: CN
Inventors: 张文伟; 宋瑞潮
Original assignee: Xi'an Zhongke Alpha Electronic Technology Co ltd
Current assignee: Xi'an Zhongke Alpha Electronic Technology Co ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2020-06-16
Anticipated expiration: 2029-09-27

Abstract

The utility model belongs to a sensor of a moped, which aims to solve the problems that a speed sensor used for the moped in the prior art can not accurately provide power assistance when climbing, or has low sensitivity, poor precision and complex structure, and provides a torque sensor used for the moped, which comprises an annular magnet and a middle body; the middle body is a circular sleeve with a spiral groove in the middle, and two ends of the circular sleeve are provided with programmable magnetic encoders; the annular magnets are arranged at two ends of the intermediate body, a gap is reserved between the annular magnets and the intermediate body, one half of the annular magnet is a south pole, and the other half of the annular magnet is a north pole; and the two ends of the intermediate body are respectively connected with an input connection mechanism and an output connection mechanism which are connected in series between the two parts to be tested.

Description

Torque sensor for moped

Technical Field

The utility model belongs to the vehicle using motor sensor, concretely relates to a torque sensor for vehicle using motor.

Background

With the improvement of living standard, the electric bicycle is used as a body-building apparatus besides a travel tool, and the application range is gradually expanded. The electric moped needs to be provided with a torque sensor for detecting the torque of manually pedaling the pedal and outputting the torque to the motor drive controller, and the motor drive controller judges the force of a rider pedaling the pedal according to the torque so as to control the output power of the motor, so that the rider obtains assistance, the body exercising effect can be realized, and the rider does not feel uncomfortable.

The torque sensor used by the electric moped on the market at present generally has the following problems: 1. the moment can not be really measured, only the speed of the pedal is measured, but when the electric bicycle goes up a slope, the speed of the pedal is not high, and the output power of the motor can not be correctly and timely adjusted; 2. even if the moment can be measured, the measurement accuracy is also low, resulting in poor user experience.

Fig. 1 is a schematic diagram of a conventional speed sensor structure, and the principle is that a turntable 1 and a stator 3 are respectively installed on a center shaft and a frame of an electric bicycle, the center shaft drives the turntable 1 to rotate for one circle every time, 4 magnets 2 on the turntable 1 pass through a hall switch 4 on the stator 3 for four times, and 4 pulses are generated every rotation for one circle and output from the hall switch 4. The rotating speed of the rotary disc 1 is increased along with the rotation speed of the pedal, the more pulses are output by the Hall switch 4 in unit time, and the faster the rotation speed of the pedal is proved to be. The logic of the whole control is that the faster the rotating speed of the pedal is, the higher the power output by the motor is, and the better the performance of the power-assisted electric bicycle is. Practice proves that the method is not suitable under certain conditions, for example, when a rider climbs a slope, although a large pedaling force is used, the rotating speed of the bicycle is not high, a boosting signal sent to the motor by the rotating speed sensor is weak, the motor does not output extra boosting torque, but at the moment, a rider needs the motor to assist the rider to climb the slope, and therefore the speed sensor cannot meet the requirement of the electric moped.

Fig. 2 is another current schematic diagram of a speed sensor, the main body is an elastic main body 6, the elastic main body 6 is a circular sleeve similar to a spring structure and provided with a spiral groove in the middle section, a circle of magnetic steel is respectively adhered to two end faces of the elastic main body 6 along the circumferential direction, the magnetic steel is formed by adhering a plurality of adjacent heteropolarity small magnetic steels along the circumferential direction, hall sensors 5 are installed on supporting parts corresponding to the two circles of magnetic steels, each hall sensor 5 is respectively close to one circle of magnetic steel, an input coupling mechanism and an output coupling mechanism are respectively arranged at two ends of the elastic main body 6, and the two parts are connected in series between two parts needing torque detection. When the pedal is stepped on, the N pole and the S pole of the magnetic field are continuously alternated, square wave pulse is output, and the phase difference output by the two ends is 0. As shown in fig. 3, when the climbing or pedaling force is large, the force output when two pedals are stepped on is obviously different, so that the output at the two ends has obvious phase difference, and the more square waves are output in unit time, the faster the rotation speed is. At this point, the sensor is able to measure torque, but there are still many disadvantages: (1) the structure is complex and the reliability is not high; (2) the south and north pole magnets 7 have poor precision and low cost performance; (3) the sensitivity is poor, the magnetic steel can output 64 square waves after rotating for one circle, namely the existence of the torque can be sensed under the condition of changing 5-6 degrees; (4) the south and north pole magnets 7 are not uniform, and when the pedal rotates, square waves output by the two hall sensors are not uniform as shown in fig. 3.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the speedtransmitter that is used for the vehicle using motor among the prior art or can't accurately provide the helping hand when climbing, or sensitivity is low, the precision is poor, the problem that the structure is complicated, provide a torque sensor for the vehicle using motor.

In order to achieve the above object, the utility model provides a following technical scheme:

a torque sensor for a moped is characterized by comprising an annular magnet intermediate body;

the middle body is an elastic round sleeve with a spiral groove in the middle, and two ends of the round sleeve are provided with programmable magnetic encoders;

or the intermediate body is a solid rigid rod, and two ends of the solid rigid rod are provided with programmable magnetic encoders;

the annular magnets are arranged at two ends of the intermediate body, and a gap is reserved between the annular magnets and the intermediate body; one half of the ring of the annular magnet is south pole, and the other half of the ring is north pole; and the two ends of the intermediate body are respectively connected with an input connection mechanism and an output connection mechanism which are connected in series between the two parts to be tested.

According to the practical use condition, under a certain precision, if the programmable magnetic encoder can output fewer pulses and needs larger torque change to sense, an elastic circular sleeve can be used; if the programmable magnetic encoder is capable of outputting more pulses, a solid rigid rod can be used directly.

Further, the programmable magnetic encoder can output 2 for each revolution of the ring magnet¹⁴And (4) a pulse.

Furthermore, the programmable magnetic encoder is arranged on the end faces of the two ends of the circular sleeve.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses a magnetic encoder and ring magnet replace magnetic switch and multistage magnet among the prior art for the moment of torsion sensor of vehicle using motor, and ring magnet is rotatory, and magnetic encoder sends the pulse simultaneously, and the pulse number that sends according to magnetic encoder can correspondingly improve the torque precision, heightens the accuracy of testing the speed. Especially when the moped climbs a slope, the torque force is sensed to be increased, and the motor can respond quickly to achieve the aim of saving labor.

2. The utility model discloses a magnetic encoder able to programme can output 2¹⁴The pulse further improves the speed measurement precision.

Drawings

FIG. 1 is a schematic diagram of a speed sensor in the prior art;

FIG. 2 is a schematic diagram of another prior art speed sensor configuration;

FIG. 3 is a schematic diagram of square waves output by two Hall sensors in FIG. 2;

fig. 4 is a schematic view of the structural principle of the present invention.

Wherein, 1-turntable, 2-magnet, 3-stator, 4-Hall switch, 5-Hall sensor, 6-elastic main body, 7-south and north pole magnet, 8-intermediate, 9-programmable magnetic encoder, 10-annular magnet

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are not limitations of the present invention.

The utility model discloses utilize annular magnet 10 and magnetic encoder 9 able to programme, magnetic encoder 9 able to programme sends the pulse to annular magnet, and annular magnet' S half ring is the N utmost point, and half ring is the S level in addition. When using the power-assisted vehicle, especially when climbing, obviously different to the pedal effort of both sides, the change of moment of torsion just can be responded to north and south pole magnet to the mode of common attached magnet, generally attached 64, when turning angle 5.625, nevertheless the utility model discloses a method can reach and far be higher than foretell precision through the output pulse ability of magnetic encoder 9 able to programme.

Example one

A torque sensor for a power-assisted vehicle comprises a ring magnet 10 and a middle body 8; the intermediate body 8 is a circular sleeve with a spiral groove in the middle, and two ends of the circular sleeve are provided with programmable magnetic encoders 9; the annular magnets 10 are respectively arranged at positions corresponding to the programmable magnetic encoders 9, the centers of the annular magnets 10 are corresponding to the programmable magnetic encoders 9, half of the annular magnets 10 are south poles, and the other half of the annular magnets are north poles; the two ends of the intermediate body 8 are respectively connected with an input connection mechanism and an output connection mechanism which are connected in series between two parts to be tested, wherein the programmable magnetic encoder 9 can output 2 every time the annular magnet 10 rotates for one circle¹⁴When the pulse is generated, the ring magnet 10 rotates for 360 degrees, and the change of the torque can be sensed when the ring magnet rotates for 0.022 degrees.

Example two

A torque sensor for a power-assisted vehicle comprises a ring magnet 10 and a middle body 8; the intermediate body 8 is a circular sleeve with a spiral groove in the middle, and two ends of the circular sleeve are provided with programmable magnetic encoders 9; the ring magnets 10 are respectively disposed at positions opposite to the programmable magnetic encoders 9, at the centers of the ring magnets 10Opposite to the programmable magnetic encoder 9, half of the circular ring of the ring magnet 10 is south, and the other half is north; the two ends of the intermediate body 8 are respectively connected with an input connection mechanism and an output connection mechanism which are connected in series between two parts to be tested, wherein the programmable magnetic encoder 9 can output 2 every time the annular magnet 10 rotates for one circle¹⁰After the pulse, the ring magnet 10 rotates a circle 360 °, and the torque change can be sensed after the rotation angle is 0.35 °.

EXAMPLE III

A torque sensor for a power-assisted vehicle comprises a ring magnet 10 and a middle body 8; the intermediate body 8 is a solid rigid rod, and two ends of the solid rigid rod are provided with programmable magnetic encoders 9; the annular magnets 10 are respectively arranged at positions corresponding to the programmable magnetic encoders 9, the centers of the annular magnets 10 are corresponding to the programmable magnetic encoders 9, half of the annular magnets 10 are south poles, and the other half of the annular magnets are north poles; the two ends of the intermediate body 8 are respectively connected with an input connection mechanism and an output connection mechanism which are connected in series between two parts to be tested, wherein the programmable magnetic encoder 9 can output 2 every time the annular magnet 10 rotates for one circle¹⁴When the pulse is generated, the ring magnet 10 rotates for 360 degrees, and the change of the torque can be sensed when the ring magnet rotates for 0.022 degrees.

According to the practical use condition, under a certain precision, if the programmable magnetic encoder can output less pulses and needs larger torque change to induce, the elastic circular sleeve can be used, so that a square wave can be generated only by rotating a larger angle; if the programmable magnetic encoder is capable of outputting more pulses, then the solid rigid rod can be used directly because of the high accuracy in this case and only a small change in angle is required to be detected.

When the magnetic encoder is used on a moped, two programmable magnetic encoders 9 are respectively arranged at two ends of a sleeve on the relevant surfaces of circular sleeves at two ends of a spiral groove of the intermediate body 8, and each programmable magnetic encoder 9 is respectively close to a ring of annular magnet 10; and the two ends of the intermediate body 8 are respectively provided with an input connecting mechanism and an output connecting mechanism which are connected in series between two parts needing torque detection. The middle body 8 is arranged on a shaft of the pedal, the annular magnets are arranged on the pedals on two sides, the sensors output corresponding waveforms when rotating, then corresponding speed and torque are judged, and then the corresponding speed and torque are fed back to the motor. The pedal torque measuring device is simple in structure, reliable and practical, can measure the pedal torque of the pedal plate in real time, and is not affected by installation errors and related shaft abrasion.

The above is only the embodiment of the present invention, and is not the limitation of the protection scope of the present invention, all the equivalent structure changes made in the contents of the specification and the drawings, or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A torque sensor for a power-assisted vehicle, characterized in that: comprises a ring magnet (10) and an intermediate body (8);

the middle body (8) is an elastic round sleeve with a spiral groove in the middle, and two ends of the round sleeve are provided with programmable magnetic encoders (9);

or the intermediate body (8) is a solid rigid rod, and two ends of the solid rigid rod are provided with programmable magnetic encoders (9);

the annular magnets (10) are arranged at two ends of the intermediate body (8), and a gap is reserved between the annular magnets and the intermediate body (8); half of the circular ring of the annular magnet (10) is south pole, and the other half of the circular ring is north pole; and the two ends of the intermediate body (8) are respectively connected with an input connection mechanism and an output connection mechanism and are connected between the two parts to be tested in series.

2. A torque sensor for a power-assisted vehicle as defined in claim 1, wherein: the programmable magnetic encoder (9) can output 2 every time the ring magnet (10) rotates one circle¹⁴And (4) a pulse.

3. A torque sensor for a power-assisted vehicle as defined in claim 1, wherein: the programmable magnetic encoders (9) are mounted on the end faces of the two ends of the circular sleeve.