Power supply control method of eddy current retarder

Abstract

The invention discloses a power supply control method of an eddy current retarder, and relates to the technical field of eddy current retarders, the eddy current retarder comprises a first processing unit, a second processing unit, a power driver and a CAN bus, the first processing unit and the second processing unit are both connected with the CAN bus, so that the first processing unit outputs a control signal according to a received brake pedal signal, and the second processing unit outputs a control signal according to a received brake pedal signal; the control signal is sent to the second processing unit through the CAN bus, the second processing unit controls the on-off time sequence of a stator coil of the eddy current retarder through the power driver after carrying out delay processing on the control signal, and the first processing unit is connected with an alarm unit. According to the power supply control method of the eddy current retarder, data transmission communication is carried out through the CAN bus, the wiring structure is simplified, the safety and reliability of control over the eddy current retarder are improved, meanwhile, the magnetic intensity sensor is arranged, the safety performance of use of the eddy current retarder is guaranteed, and the use efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of eddy current retarders, and in particular to a power supply control method for eddy current retarders. Background Art

[0002] The working principle of the eddy current retarder is based on electromagnetic induction. When the stator coil is activated by current to generate a magnetic field, the rotating rotor moves in the magnetic field, generating an induced current (eddy current) inside the rotor. These eddy currents are subjected to the reverse force of the magnetic field, thereby slowing down the rotation of the rotor and achieving a braking effect. By adjusting the excitation current, the magnitude of the braking torque can be accurately controlled to ensure stability and safety during use. The main structure of the eddy current retarder includes a stator coil, a fixed bracket and other structures.

[0003] In the prior art, the power supply control structure of the eddy current retarder has many cables and complex wiring, which is not easy to dissipate heat and easily causes signal crosstalk between cables, increasing unsafe factors and requiring improvement in efficiency.

[0004] Therefore, it is necessary to propose a power supply control method for eddy current retarder to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a power supply control method for an eddy current retarder to solve the problems in the prior art that the power supply control structure of the eddy current retarder has many cables and complex wiring, is not easy to dissipate heat, and easily causes signal crosstalk between cables, increases unsafe factors, and has a need to improve its efficiency.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a power supply control method for an eddy current retarder, comprising a first processing unit, a second processing unit, a power driver and a CAN bus, wherein the first processing unit and the second processing unit are both connected to the CAN bus, so that the first processing unit outputs a control signal according to a received brake pedal signal, and the control signal is sent to the second processing unit through the CAN bus, and the second processing unit controls the on-off timing of the stator coil of the eddy current retarder through the power driver after delay processing of the control signal, and the first processing unit is connected to an alarm unit;

[0007] It also includes a magnetic strength sensor, which is connected to the second processing unit. The magnetic strength sensor is used to monitor the magnetic strength of the stator coil in the eddy current retarder. When the magnetic strength sensor monitors that the magnetism generated by the stator coil is lower than a set threshold, the magnetic strength sensor feeds back the data signal to the second processing unit, and the second processing unit sends the data signal to the first processing unit through the CAN bus, and the first processing unit controls the alarm unit to sound an alarm.

[0008] Preferably, the magnetic strength sensor includes a magnetoresistive sensor, a Hall sensor and a magnetoelectric induction sensor.

[0009] Preferably, a speed sensor is also included, which is connected to the second processing unit. The speed sensor is used to monitor the rotational speed of the rotor in the eddy current retarder. When the rotational speed of the rotor monitored by the speed sensor is lower than a set threshold, the speed sensor feeds back the data signal to the second processing unit, and the second processing unit controls the on-off timing of the stator coil of the eddy current retarder through a power driver.

[0010] Preferably, it also includes a first photocoupler and a second photocoupler, the first photocoupler receives a brake pedal signal, the CAN bus has a first CAN transceiver and a second CAN transceiver, the first photocoupler, the first processing unit and the first CAN transceiver are connected in sequence, and the second CAN transceiver, the second processing unit, the second photocoupler and the power driver are connected in sequence.

[0011] The present invention also discloses an eddy current retarder, and uses the above-mentioned eddy current retarder power supply control method to realize the control of the power-on timing of the stator coil in the eddy current retarder;

[0012] The eddy current retarder comprises a rotating drum, a stator shaft and two rotor disks, wherein the rotating drum is fixedly connected between the two rotor disks by bolts, the stator shaft passes through the center holes of the two rotor disks, the two rotor disks are supported on the stator shaft by bearings, a limiting sleeve is fixedly connected to the stator shaft, the limiting sleeve is located between the two rotor disks, both ends of the limiting sleeve are provided with a rotating groove, a ball is rotatably arranged inside the rotating groove, and there is a gap between the ball and the corresponding inner wall of the rotor disk;

[0013] Preferably, a liquid cavity for storing lubricating liquid is provided in the upper half of the limiting sleeve, and processing grooves are provided at both ends of the limiting sleeve, the liquid cavity is located between the two processing grooves, and a slide plate is slidably provided inside the processing groove, and the slide plate divides the processing groove into an extrusion chamber and a collection chamber;

[0014] Among them, the extrusion bin is close to the stator shaft, a sponge block is arranged inside the extrusion bin, a liquid hole is opened on the inner wall of the extrusion bin, the extrusion bin is connected with the liquid cavity through the liquid hole, a through hole is opened on the inner wall of the rotating groove, and the rotating groove is connected with the corresponding collecting bin through the through hole.

[0015] Preferably, a magnetic block is provided inside the collecting bin, and the magnetic block is fixedly connected to the slide plate.

[0016] Preferably, a plurality of first magnetic yokes are fixedly arranged on the inner wall of the rotating drum, and a plurality of second magnetic yokes are fixedly arranged on the surfaces of the two rotor disks close to each other;

[0017] A stator yoke assembly is arranged outside the limiting sleeve, and the stator yoke assembly includes a stator frame, a first U-shaped stator yoke and two second U-shaped stator yokes. The stator frame is fixed to the outer wall of the limiting sleeve, the first U-shaped stator yoke is fixedly connected to one end of the stator frame away from the limiting sleeve, the U-shaped notch of the first U-shaped stator yoke faces the inner wall of the drum, the first U-shaped stator yoke cooperates with the first yoke, and an air gap is arranged between the first U-shaped stator yoke and the first yoke;

[0018] The two second U-shaped stator yokes are fixedly connected to both sides of the stator frame respectively, the U-shaped notch of the second U-shaped stator yoke faces the corresponding rotor disk, the second U-shaped stator yoke cooperates with the second yoke on the corresponding rotor disk, and an air gap is arranged between the second U-shaped stator yoke and the second yoke on the corresponding rotor disk.

[0019] Preferably, a first excitation coil is wound in the U-shaped slot of the first U-shaped stator yoke, and a second excitation coil is wound in the U-shaped slot of the second U-shaped stator yoke.

[0020] Preferably, the stator yoke assemblies are provided in 18 to 24 groups.

[0021] Preferably, a square groove is provided at one end of the collecting bin away from the extrusion bin, and the square groove penetrates the outer surface of the limiting sleeve, a sliding rod is slidably arranged inside the square groove, the sliding plate is fixedly connected to the sliding rod, a spring is sleeved on the outside of the sliding rod, one end of the spring is fixedly connected to the sliding plate, and the other end of the spring is fixedly connected to the inner wall of the collecting bin, and a stainless steel block is fixedly connected to one end of the sliding rod away from the sliding plate, and the stainless steel block cooperates with one of the second excitation coils.

[0022] Technical effects and advantages of the present invention:

[0023] 1. The present invention uses the CAN bus to transmit and communicate data, simplifies the wiring structure, improves the safety and reliability of the eddy current retarder control, and at the same time, by setting a magnetic strength sensor, ensures the safety performance of the eddy current retarder and improves the use efficiency;

[0024] 2. The present invention avoids the situation of large power loss and low retarder efficiency by setting a speed sensor, which can reduce the negative impact on the vehicle power supply system and other vehicle components and increase the service life of the eddy current retarder;

[0025] 3. Compared with the disc-type eddy current retarder in the prior art, the present invention adopts a structure such as a first U-shaped stator yoke and a second U-shaped stator yoke to improve the space utilization rate of the electromagnetic field, and the braking torque per unit mass is larger, thereby improving the flexibility of the use of the eddy current retarder;

[0026] 4. By setting the limit sleeve, ball bearing and other structures, when the rotor disc has the tendency of axial movement, the limit effect is achieved to avoid the movement and improve the stability of the eddy current retarder; and the ball bearing can roll on the rotor disc without affecting the relative rotation between the stator shaft and the rotor disc, thus ensuring the normal use of the eddy current retarder;

[0027] 5. During normal use, the stator shaft and the rotor disk rotate relative to each other. Since there is a certain gap between the ball and the corresponding rotor disk, the ball can be prevented from continuously rolling on the rotor disk, thus reducing wear.

[0028] 6. By setting up structures such as slide plates and sponge blocks, lubricating liquid can be applied to the ball bearings, and the debris between the rotating groove and the ball bearings can be sucked out at the same time, so that the debris is collected inside the collection bin, avoiding the debris from continuously adhering to the ball bearings, and reducing the wear between the ball bearings and the rotor disk;

[0029] 7. Set up a sponge block so that the lubricating liquid that enters the rotating groove from the through hole is appropriate, and there will be no excessive lubricating liquid dripping;

[0030] 8. When the debris is collected inside the collection bin, it will be attracted by the magnetic block to prevent it from being scattered randomly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a flow chart of the power supply control method of the eddy current retarder of the present invention.

[0032] Figure 2 It is a schematic diagram of the structure of the eddy current retarder of the present invention.

[0033] Figure 3 It is a schematic diagram of the structure of the stator shaft and the limiting sleeve of the present invention.

[0034] Figure 4 It is a schematic diagram of the structure of the rotating drum and the first magnetic yoke of the present invention.

[0035] Figure 5 It is a schematic diagram of the rotor disk and the second yoke structure of the present invention.

[0036] Figure 6 It is a schematic diagram of the cross-sectional structure of the eddy current retarder of the present invention.

[0037] Figure 7 For the present invention Figure 6 A schematic diagram of the enlarged structure in the middle.

[0038] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point B in the middle.

[0039] Fig. 9 It is a schematic diagram of the magnetic block structure of the present invention.

[0040] In the figure: 1. rotor disk; 2. rotating drum; 3. stator shaft; 4. stator frame; 5. first U-shaped stator yoke; 6. first excitation coil; 7. first yoke; 8. second U-shaped stator yoke; 9. second excitation coil; 10. second yoke; 11. limit sleeve; 12. liquid chamber; 13. processing tank; 14. extrusion chamber; 15. liquid hole; 16. sponge block; 17. slide plate; 18. collection chamber; 19. through hole; 20. rotating groove; 21. ball bearing; 22. slide rod; 23. stainless steel block; 24. magnetic block; 25. spring. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The present invention provides Figure 1 The power supply control method for the eddy current retarder shown includes a first processing unit, a second processing unit, a power driver and a CAN bus, the CAN bus has a first CAN transceiver and a second CAN transceiver, the first processing unit and the second processing unit are both connected to the CAN bus, so that the first processing unit outputs a control signal according to the received brake pedal signal, and the control signal is sent to the second processing unit through the CAN bus, and the second processing unit controls the on-off timing of the stator coil of the eddy current retarder through the power driver after delay processing of the control signal; it also includes a first photoelectric coupler and a second photoelectric coupler, the first photoelectric coupler receives the brake pedal signal, the first photoelectric coupler, the first processing unit and the first CAN transceiver are connected in sequence, and the second CAN transceiver, the second processing unit, the second photoelectric coupler and the power driver are connected in sequence.

[0043] The CAN bus protocol is the SAEJ1939 protocol, and the first CAN transceiver and the second CAN transceiver both receive instructions and acquisition signals from the CAN bus or send instructions and acquisition signals to the CAN bus according to the protocol.

[0044] The first processing unit is connected to an alarm unit. The alarm unit is a common existing technology and will not be described in detail here. The alarm unit includes structures such as sound and light alarms to achieve an alarm effect.

[0045] Considering that the working principle of the eddy current retarder is based on electromagnetic induction, when the stator coil is activated by current to generate a magnetic field, the rotating rotor moves in the magnetic field, and an induced current (eddy current) is generated inside the rotor. These eddy currents are subjected to the reverse force of the magnetic field, thereby slowing down the rotation of the rotor to achieve a braking effect. Considering that long-term or excessive use of the eddy current retarder, or improper operation during use, may cause damage to the stator coil, in order to monitor the stator coil and ensure the stability of the use of the eddy current retarder, the present invention also includes a magnetic strength sensor, and the magnetic strength sensor can use a magnetoresistive sensor, a Hall sensor, a magnetoelectric induction sensor, etc.

[0046] The magnetic strength sensor is connected to the second processing unit. The magnetic strength sensor is used to monitor the magnetic strength of the stator coil in the eddy current retarder. When the magnetic strength sensor monitors that the magnetism generated by the stator coil is lower than the set threshold, the magnetic strength sensor feeds back the data signal to the second processing unit. The second processing unit sends the data signal to the first processing unit through the CAN bus, and the first processing unit controls the alarm unit to sound an alarm.

[0047] When current is passed through the stator coil, a magnetic field will be generated around the stator coil according to the Oersted experiment principle. When the magnetic strength sensor monitors that the magnetism generated by the stator coil is lower than the set threshold, the magnetic strength sensor will feed back the data signal to the second processing unit, and the second processing unit will send the data signal to the first processing unit through the CAN bus. The first processing unit controls the alarm unit to sound an alarm, thereby reminding the operator to perform maintenance, ensure the safety performance of the eddy current retarder, and improve its efficiency.

[0048] During normal use, when a certain value of current is passed through, the stator coil will generate magnetism of corresponding magnitude, which is defined as the threshold. When the stator coil is damaged, the actual magnetism generated by the stator coil will be lower than the threshold, and an alarm will be issued.

[0049] The present invention performs data transmission and communication through the CAN bus, simplifies the wiring structure, improves the safety and reliability of the control of the eddy current retarder, and at the same time, by setting a magnetic strength sensor, ensures the safety performance of the eddy current retarder and improves the use efficiency.

[0050] The present invention also includes a speed sensor, which is connected to the second processing unit. The speed sensor is used to monitor the rotational speed of the rotor in the eddy current retarder. The rotational speed of the rotor is consistent with the driving speed of the vehicle. When the speed sensor monitors that the rotational speed of the rotor is lower than a set threshold, the speed sensor feeds back the data signal to the second processing unit, and the second processing unit controls the on-off timing of the stator coil of the eddy current retarder through a power driver.

[0051] The threshold is set to 20km / h. When the driving speed is lower than 20km / h, it is relatively safer because the speed of the car is relatively low, but the brake pedal needs to be stepped on in real time. Therefore, in the prior art, when the speed of the car is maintained at a speed below 20km / h, the stator coil in the eddy current retarder is always energized, which consumes more power. Therefore, in the present invention, a speed sensor is provided to monitor the rotation speed of the rotor in the eddy current retarder. When the speed of the car is maintained at a speed below 20km / h, the stator coil is in a power-off state, thereby avoiding large power loss and low retarder efficiency, reducing the negative impact on the vehicle power supply system and other components of the vehicle, and increasing the service life of the eddy current retarder. When braking to stop, the brake pedal can be fully depressed and the stator coil is energized.

[0052] And the speed threshold can be adjusted according to specific usage conditions.

[0053] The present invention provides Figure 2 to Figure 9 The eddy current retarder shown uses the above-mentioned power supply control method to realize the control of the power-on timing of the stator coil in the eddy current retarder.

[0054] Eddy current retarders can be used in automobiles or mechanical processing equipment and can be installed according to actual needs.

[0055] Considering that the eddy current retarder in the prior art has complex winding, large volume, heavy mass, inconvenient installation, and low magnetic field utilization, the eddy current retarder of the present invention includes a drum 2, a stator shaft 3 and two rotor discs 1, the drum 2 is fixedly connected between the two rotor discs 1 by bolts, the stator shaft 3 passes through the center holes of the two rotor discs 1, and the two rotor discs 1 are supported on the stator shaft 3 by bearings. The two rotor discs 1 are fixed to the input end of the rear axle of the automobile or the output end of the gearbox through a connecting flange, and both ends of the stator shaft 3 are connected to the half shaft through a coupling.

[0056] A limiting sleeve 11 is fixedly connected to the stator shaft 3 , and the limiting sleeve 11 is located between the two rotor disks 1 .

[0057] A plurality of first magnetic yokes 7 are fixedly arranged on the inner wall of the drum 2 , and a plurality of second magnetic yokes 10 are fixedly arranged on the surfaces of the two rotor disks 1 that are close to each other.

[0058] A stator yoke assembly is arranged outside the limiting sleeve 11, and the stator yoke assembly includes a stator frame 4, a first U-shaped stator yoke 5 and two second U-shaped stator yokes 8. The stator frame 4 is fixed on the outer wall of the limiting sleeve 11, and the first U-shaped stator yoke 5 is fixedly connected to the end of the stator frame 4 away from the limiting sleeve 11. The U-shaped notch of the first U-shaped stator yoke 5 faces the inner wall of the rotating drum 2. The first U-shaped stator yoke 5 cooperates with the first yoke 7, and an air gap is arranged between the first U-shaped stator yoke 5 and the first yoke 7.

[0059] The two second U-shaped stator yokes 8 are fixedly connected to the two sides of the stator frame 4 respectively, the U-shaped notch of the second U-shaped stator yoke 8 faces the corresponding rotor disk 1, the second U-shaped stator yoke 8 cooperates with the second yoke 10 on the corresponding rotor disk 1, and an air gap is arranged between the second U-shaped stator yoke 8 and the second yoke 10 on the corresponding rotor disk 1.

[0060] A first excitation coil 6 is wound in the U-shaped slot of the first U-shaped stator yoke 5 , and a second excitation coil 9 is wound in the U-shaped slot of the second U-shaped stator yoke 8 .

[0061] Specifically, when the car is running normally, no current flows into the first excitation coil 6 and the second excitation coil 9, no magnetic field is generated, and the retarder does not work.

[0062] When the car needs to brake, the driver steps on the brake pedal, and current is passed through the first excitation coil 6. When current is passed through the first excitation coil 6, according to the Oersted experimental principle, a magnetic field is generated around the first excitation coil 6, and the magnetic field generated by the first excitation coil 6 passes through the first U-shaped stator yoke 5, and the magnetic field lines form a magnetic field loop through the first excitation coil 6, the air gap and the drum 2. When there is relative motion between the drum 2 and the first U-shaped stator yoke 5, due to electromagnetic induction, eddy currents are generated in the drum 2, and the eddy currents move in the electromagnetic field formed by the first U-shaped stator yoke 5 and are subjected to electromagnetic forces in the opposite direction of the motion, thereby reducing the rotation speed of the drum 2 and achieving a braking effect.

[0063] Similarly, when current is passed through the second excitation coil 9, according to the Oersted experimental principle, a magnetic field is generated around the second excitation coil 9, and the magnetic field passes through the second U-shaped stator yoke 8, and the magnetic field lines form a magnetic field loop through the second U-shaped stator yoke 8, the air gap and the rotor disk 1. When there is relative motion between the rotor disk 1 and the second U-shaped stator yoke 8, eddy currents are generated due to electromagnetic induction. The eddy currents move in the electromagnetic field formed by the second U-shaped stator yoke 8 and are subject to electromagnetic forces in the opposite direction of the motion, thereby reducing the rotation speed of the rotor disk 1 and achieving a braking effect.

[0064] There are 18 to 24 sets of yoke assemblies, and the second yoke 10 and the corresponding rotor disk 1 are integrally formed. The first yoke 7 and the drum 2 are integrally formed. The rotor disk 1 and the drum 2 can both be made of alloy steel, the first U-shaped stator yoke 5, the second U-shaped stator yoke 8, the iron core of the first excitation coil 6, and the iron core of the second excitation coil 9 are all made of pure iron materials, and the first excitation coil 6 and the second excitation coil 9 are both wound with pure copper wire.

[0065] Compared with the disc-type eddy current retarder in the prior art, the present invention improves the space utilization rate of the electromagnetic field by setting a first U-shaped stator yoke 5, a second U-shaped stator yoke 8 and other structures, and the braking torque per unit mass is larger, thereby improving the flexibility of using the eddy current retarder.

[0066] Considering that the rotor structure of the eddy current retarder is prone to axial movement, and the rotor will scratch the stator during movement, causing damage to the eddy current retarder, in order to improve the stability of the use of the eddy current retarder, a rotation groove 20 is provided at both ends of the limit sleeve 11, and a ball 21 is provided inside the rotation groove 20. There is a certain gap between the ball 21 and the inner wall of the corresponding rotor disk 1, and the gap is set to 1mm, which can also be adjusted according to specific usage conditions.

[0067] During normal use, the stator shaft 3 and the rotor disk 1 rotate relative to each other. Since there is a certain gap between the ball 21 and the corresponding rotor disk 1, the ball 21 can be prevented from continuously rolling on the rotor disk 1, thereby reducing wear.

[0068] By providing structures such as the limit sleeve 11 and the ball 21, when the rotor disk 1 has a tendency to axially move, the ball 21 on the limit sleeve 11 at a position opposite to the moving direction will abut against the corresponding rotor disk 1, thereby achieving a limiting effect, avoiding the movement, and improving the stability of the eddy current retarder; and the ball 21 can roll on the rotor disk 1 without affecting the relative rotation between the stator shaft 3 and the rotor disk 1, thereby ensuring the normal use of the eddy current retarder.

[0069] Reference Figure 6 When the rotor disk 1 has a tendency to move axially to the right, the ball 21 located on the left side of the limiting sleeve 11 will abut against the rotor disk 1 on the left side.

[0070] Considering that the ball 21 is prone to wear and a small amount of debris when rolling on the rotor disk 1, in order to reduce the wear between the ball 21 and the rotor disk 1, a liquid cavity 12 for storing lubricating liquid is provided in the upper half of the limiting sleeve 11. Liquids such as coolant can also be used, which can be adjusted according to specific usage conditions. Treatment grooves 13 are provided at both ends of the inside of the limiting sleeve 11, and the liquid cavity 12 is located between the two treatment grooves 13. A slide plate 17 is slidably provided inside the treatment groove 13, and the slide plate 17 divides the treatment groove 13 into an extrusion bin 14 and a collection bin 18, wherein the extrusion bin 14 is close to the stator shaft 3, and a liquid hole 15 is provided on the inner wall of the extrusion bin 14, and the extrusion bin 14 is connected to the liquid cavity 12 through the liquid hole 15.

[0071] A sponge block 16 is disposed inside the squeezing chamber 14 . The lubricating liquid in the liquid cavity 12 enters the squeezing chamber 14 through the liquid hole 15 and is absorbed by the sponge block 16 .

[0072] In order to suck the debris between the rotating groove 20 and the ball 21 and facilitate the lubricating liquid to enter the rotating groove 20, a through hole 19 is opened on the inner wall of the rotating groove 20, and the rotating groove 20 is connected to the corresponding collecting bin 18 through the through hole 19.

[0073] A square groove is formed at one end of the collecting bin 18 away from the squeezing bin 14, and the square groove penetrates the outer surface of the limiting sleeve 11, a slide bar 22 is slidably arranged inside the square groove, and the slide plate 17 is fixedly connected to the slide bar 22. A spring 25 is sleeved outside the slide bar 22, one end of the spring 25 is fixedly connected to the slide plate 17, and the other end of the spring 25 is fixedly connected to the inner wall of the collecting bin 18.

[0074] The end of the slide bar 22 away from the slide plate 17 is fixedly connected with a stainless steel block 23. The stainless steel block 23 can be made of magnetically affected stainless steel. The stainless steel block 23 cooperates with one of the second excitation coils 9. Figure 6 The stainless steel block 23 cooperates with the second excitation coil 9 located above it. When current is passed through the second excitation coil 9, a magnetic field is generated around the second excitation coil 9, which will produce a suction effect on the stainless steel block 23, so that the stainless steel block 23 drives the slide bar 22 and the slide plate 17 to move synchronously.

[0075] When the car is running normally, no current is passed through the first excitation coil 6 and the second excitation coil 9, and no magnetic field is generated. The elastic support force of the spring 25 keeps the positions of the slide plate 17, the slide bar 22, the stainless steel block 23 and other structures fixed, and at this time, the rotating groove 20 is connected with the corresponding collection bin 18 through the through hole 19 (refer to Figure 8 ), the sponge block 16 is compressed.

[0076] When the car needs to brake, the driver steps on the brake pedal, current is passed through the second excitation coil 9, and a magnetic field is generated around the second excitation coil 9, which will produce a suction effect on the stainless steel block 23, so that the stainless steel block 23 drives the slide bar 22 and the slide plate 17 to move synchronously in the direction away from the stator shaft 3, the squeezing bin 14 expands, and the collecting bin 18 becomes smaller. The squeezing bin 14 can be connected to the rotating groove 20 through the through hole 19, and the sponge block 16 corresponds to the through hole 19. The sponge block 16 is restored to the open state from being compressed, and will absorb more lubricating fluid. The lubricating fluid absorbed by the sponge block 16 enters the rotating groove 20 through the through hole 19 and is smeared on the ball 21, thereby reducing the wear between the ball 21 and the rotor disk 1.

[0077] The sponge block 16 is provided so that an appropriate amount of lubricating liquid enters the rotating groove 20 through the through hole 19, and there will be no excessive lubricating liquid dripping.

[0078] When braking is stopped and the vehicle continues to travel, the magnetic field generated around the second excitation coil 9 disappears, and under the reset force of the spring 25, the slide plate 17 slides and resets toward the stator shaft 3. Since the rotating groove 20 is connected to the collecting bin 18 through the through hole 19, when the slide plate 17 slides toward the stator shaft 3, the debris between the rotating groove 20 and the ball 21 will be sucked through the through hole 19, so that the debris enters the interior of the collecting bin 18, avoiding the debris from continuously adhering to the ball 21, further reducing the wear between the ball 21 and the rotor disk 1, and the slide plate 17 can isolate the extrusion bin 14 and the collecting bin 18 to prevent the debris from entering the extrusion bin 14; at the same time, the sliding of the slide plate 17 will squeeze the sponge block 16, so that the sponge block 16 can be restored from being compressed to the open state to absorb more lubricating fluid.

[0079] At this time, the lubricating liquid will not enter the rotating groove 20 through the through hole 19, thereby preventing the lubricating liquid from dripping randomly.

[0080] By providing structures such as the slide plate 17 and the sponge block 16, lubricating liquid can be applied to the ball 21, and at the same time, the debris between the rotating groove 20 and the ball 21 can be sucked so that the debris is collected into the collection bin 18, thereby preventing the debris from continuously adhering to the ball 21 and reducing the wear between the ball 21 and the rotor disk 1.

[0081] If necessary, an electromagnet may be provided to drive the stainless steel block 23, the slide bar 22, the slide plate 17 and other structures to move, which may be adjusted according to specific usage conditions.

[0082] Considering that the debris enters the collecting bin 18 and easily flows back to the rotating groove 20 through the through hole 19, a magnetic block 24 is provided inside the collecting bin 18, and the magnetic block 24 is fixedly connected to the slide plate 17. When the debris is collected inside the collecting bin 18, it will be adsorbed by the magnetic block 24 to avoid being scattered randomly.

[0083] During specific use, the limit sleeve 11 is provided with a liquid injection groove, a sealing cover and other structures (not shown in the figure) connected to the liquid chamber 12, so that the lubricating liquid can be replenished during the maintenance process; at the same time, the limit sleeve 11 is also provided with a material extraction hole connected to the collection bin 18 to process the debris adsorbed by the magnetic block 24.

Claims

1. A power supply control method for an eddy current retarder, comprising a first processing unit, a second processing unit, a power driver and a CAN bus, characterized in that: The first processing unit and the second processing unit are both connected to the CAN bus, so that the first processing unit outputs a control signal according to the received brake pedal signal, and the control signal is sent to the second processing unit through the CAN bus. The second processing unit controls the on-off timing of the stator coil of the eddy current retarder through the power driver after delay processing of the control signal, and the first processing unit is connected to an alarm unit; It also includes a magnetic strength sensor, which is connected to the second processing unit. The magnetic strength sensor is used to monitor the magnetic strength of the stator coil in the eddy current retarder. When the magnetic strength sensor monitors that the magnetism generated by the stator coil is lower than a set threshold, the magnetic strength sensor feeds back the data signal to the second processing unit, and the second processing unit sends the data signal to the first processing unit through the CAN bus, and the first processing unit controls the alarm unit to sound an alarm.

2. The power supply control method of the eddy current retarder according to claim 1, characterized in that: The magnetic strength sensor includes a Hall sensor.

3. The power supply control method of the eddy current retarder according to claim 1, characterized in that: It also includes a speed sensor, which is connected to the second processing unit. The speed sensor is used to monitor the rotational speed of the rotor in the eddy current retarder. When the rotational speed of the rotor monitored by the speed sensor is lower than a set threshold, the speed sensor feeds back the data signal to the second processing unit, and the second processing unit controls the on-off timing of the stator coil of the eddy current retarder through a power driver.

4. The power supply control method of the eddy current retarder according to claim 1, characterized in that: It also includes a first photocoupler and a second photocoupler, the first photocoupler receives a brake pedal signal, the CAN bus has a first CAN transceiver and a second CAN transceiver, the first photocoupler, the first processing unit and the first CAN transceiver are connected in sequence, and the second CAN transceiver, the second processing unit, the second photocoupler and the power driver are connected in sequence.

5. Eddy current retarder, characterized by: Using the power supply control method of the eddy current retarder according to any one of claims 1 to 4 to realize the control of the power-on timing of the stator coil in the eddy current retarder; The eddy current retarder comprises a rotating drum (2), a stator shaft (3) and two rotor disks (1); the rotating drum (2) is fixedly connected between the two rotor disks (1) by bolts; the stator shaft (3) passes through the center holes of the two rotor disks (1); the two rotor disks (1) are supported on the stator shaft (3) by bearings; a limiting sleeve (11) is fixedly connected to the stator shaft (3); the limiting sleeve (11) is located between the two rotor disks (1); both ends of the limiting sleeve (11) are provided with rotating grooves (20); a ball (21) is rotatably arranged inside the rotating groove (20); and a gap is provided between the ball (21) and the inner wall of the corresponding rotor disk (1).

6. The eddy current retarder according to claim 5, characterized in that: The upper half of the limiting sleeve (11) is provided with a liquid cavity (12) for storing lubricating liquid, and both ends of the limiting sleeve (11) are provided with processing grooves (13), the liquid cavity (12) is located between the two processing grooves (13), and a slide plate (17) is slidably provided inside the processing groove (13), and the slide plate (17) divides the processing groove (13) into a squeezing chamber (14) and a collecting chamber (18); The extrusion bin (14) is close to the stator shaft (3), a sponge block (16) is arranged inside the extrusion bin (14), a liquid hole (15) is opened on the inner wall of the extrusion bin (14), the extrusion bin (14) is connected with the liquid cavity (12) through the liquid hole (15), and a through hole (19) is opened on the inner wall of the rotating groove (20), the rotating groove (20) is connected with the corresponding collecting bin (18) through the through hole (19).

7. The eddy current retarder according to claim 6, characterized in that: A magnetic block (24) is arranged inside the collecting bin (18), and the magnetic block (24) is fixedly connected to the slide plate (17).

8. The eddy current retarder according to claim 7, characterized in that: A plurality of first magnetic yokes (7) are fixedly arranged on the inner wall of the rotating drum (2), and a plurality of second magnetic yokes (10) are fixedly arranged on the surfaces of the two rotor disks (1) close to each other; A stator yoke assembly is arranged outside the limiting sleeve (11), and the stator yoke assembly comprises a stator frame (4), a first U-shaped stator yoke (5) and two second U-shaped stator yokes (8); The stator frame (4) is fixed on the outer wall of the limiting sleeve (11), the first U-shaped stator yoke (5) is fixedly connected to one end of the stator frame (4) away from the limiting sleeve (11), the U-shaped notch of the first U-shaped stator yoke (5) faces the inner wall of the rotating drum (2), the first U-shaped stator yoke (5) cooperates with the first yoke (7), and an air gap is provided between the first U-shaped stator yoke (5) and the first yoke (7); Two second U-shaped stator yokes (8) are respectively fixedly connected to two sides of the stator frame (4); the U-shaped notches of the second U-shaped stator yokes (8) face the corresponding rotor disk (1); the second U-shaped stator yokes (8) cooperate with the second yokes (10) on the corresponding rotor disk (1); and an air gap is provided between the second U-shaped stator yokes (8) and the second yokes (10) on the corresponding rotor disk (1); A first excitation coil (6) is wound in the U-shaped groove of the first U-shaped stator yoke (5), and a second excitation coil (9) is wound in the U-shaped groove of the second U-shaped stator yoke (8).

9. The eddy current retarder according to claim 8, characterized in that: The stator yoke assemblies are provided in 18 to 24 groups.

10. The eddy current retarder according to claim 8, characterized in that: A square groove is provided at one end of the collecting bin (18) away from the squeezing bin (14), and the square groove penetrates the outer surface of the limiting sleeve (11). A sliding rod (22) is slidably arranged inside the square groove. The slide plate (17) is fixedly connected to the sliding rod (22). A spring (25) is sleeved on the outside of the sliding rod (22). One end of the spring (25) is fixedly connected to the slide plate (17), and the other end of the spring (25) is fixedly connected to the inner wall of the collecting bin (18). One end of the sliding rod (22) away from the slide plate (17) is fixedly connected to a stainless steel block (23), and the stainless steel block (23) cooperates with one of the second excitation coils (9).

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