A two-stage brake electromagnetic brake and motor device

Abstract

The application provides a dual-stage braking electromagnetic brake and a motor device, the dual-stage braking electromagnetic brake comprising a brake stator, a first armature, a second armature, a friction plate, a first elastic structure, a second elastic structure and a magnetic structure; the first elastic structure can provide an elastic force to the first armature, the second elastic structure can provide an elastic force to the second armature, and the magnetic structure generates a magnetic force between the brake stator; after the brake stator is powered off, the second armature can be driven by the second elastic structure to be attached to the friction plate, forming a first-stage braking, and a gap is generated between the second armature and the brake stator; when the gap is greater than or equal to a preset distance, the magnetic force generated by the magnetic structure is smaller than the elastic force of the first elastic structure, forming a second-stage braking. According to the application, the problem that the clearance gradually increases and the braking torque decays due to the wear of parts during the normal operation of a traditional brake can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of brake, in particular to a two-stage braking electromagnetic brake and motor device. BACKGROUND

[0002] The electromagnetic brake is an important basic part, which integrates machinery and electricity, and is mainly used for precise control and braking of rotating mechanism (such as motor device, etc.).

[0003] In the power-off state of the brake, the armature is axially acted by the spring force, together with the fixed limit plate clamping the friction plate, so that the friction plate is axially stressed, and there is a small gap between the armature and the stator at this time. When the connected shaft has a rotating intention, there is a friction force between the friction plate, the armature and the limit plate, which is the braking force of the brake, and can also be used for emergency deceleration braking. Correspondingly, when the brake is powered on, the coil placed in the stator core groove is powered to generate a magnetic field to attract the armature (electromagnetic force) to overcome the spring force to produce axial displacement, and the gap is shifted to between the armature and the limit plate, and the friction plate is released, and the shaft connected therewith can rotate.

[0004] The traditional brake mechanical movement and gap related parts include stator core, armature, friction plate, column sleeve, limit plate and screw. The limit plate is fixed on the stator core by the screw passing through the column sleeve; the armature and the friction plate are placed between the limit plate and the stator core, and the armature has a groove for the column sleeve to pass through, and the column sleeve plays a role in guiding the movement of the armature, and the friction plate is between the limit plate and the armature. In summary, the gap = the distance from the limit plate near the friction plate end face to the stator core near the armature end face - the thickness of the armature - the thickness of the friction plate. In the normal operation of the brake, the movement impact of the armature when powered on and off and the violent friction of the friction plate clamped with the armature and the limit plate during emergency braking will cause wear of each part, and then cause the gap to increase. The normal operation of the brake needs to ensure that the gap is within a certain range, when the gap increases, the magnetic resistance between the stator and the armature increases, and then the response time of the brake to attract the armature when powered on increases, and when the gap is too large, it is easy to cause slow response or even unable to attract the armature when powered on. In addition, the increase of the gap will also cause the compression amount of the spring to decrease, that is, the spring force decreases, and then the braking force decreases, which cannot maintain the original static friction torque and emergency braking time.

[0005] Due to the technical problems that the normal running process of the brake in the prior art causes the wear of the parts to gradually increase the gap, and causes the braking torque to decay, etc., the present application researches and designs a two-stage braking electromagnetic brake and motor device. SUMMARY

[0006] Therefore, the present application aims to solve the technical problem of overcoming the defect that the gap gradually increases due to the wear of parts during normal operation, resulting in the attenuation of braking torque, thereby providing a dual-stage braking electromagnetic brake and a motor device.

[0007] To solve the above problems, the present application provides a dual-stage braking electromagnetic brake, which comprises:

[0008] The brake stator, the first armature, the second armature, the friction plate, the first elastic structure, the second elastic structure, and the magnetic structure are all located between the brake stator and the friction plate in the axial direction of the brake stator; the first elastic structure can provide an elastic force to the first armature, the second elastic structure can provide an elastic force to the second armature, and the magnetic structure can generate a magnetic force between the first armature and the brake stator;

[0009] When the brake stator is powered off, the second armature can be driven by the second elastic structure to be in contact with the friction plate, forming a primary brake, at this time, a gap is generated between the second armature and the brake stator; when the gap is greater than or equal to a preset distance, the magnetic force generated by the magnetic structure between the first armature and the brake stator is smaller than the elastic force of the first elastic structure, and the elastic force of the first elastic structure drives the first armature to move to be in contact with the friction plate, forming a secondary brake.

[0010] In some embodiments, the first armature and the second armature are both ring structures, and the first armature is sleeved on the radial outer periphery of the second armature; the first elastic structure is arranged on the brake stator and only provides an elastic force to the first armature; the second elastic structure is arranged on the brake stator and only provides an elastic force to the second armature; and the magnetic structure is arranged on the first armature.

[0011] In some embodiments, when the brake stator is powered on, the main magnetic field generated thereby can form a loop via the brake stator, the first armature, and the second armature, and the secondary magnetic field generated by the magnetic structure also forms a loop via the brake stator, the first armature, and the second armature, at this time, the first armature and the second armature are both in contact with the brake stator.

[0012] In some embodiments, when the brake stator is powered off, the second armature has no magnetic force with the brake stator, the second armature is pushed out by the second elastic structure to form the gap with the brake stator, the magnetic structure generates a secondary magnetic field which forms a loop via the brake stator, the first armature and the second armature and the gap, and when the gap is less than a preset distance, the magnetic force between the first armature and the brake stator generated by the magnetic structure is greater than the elastic force of the first elastic structure, and the magnetic force generated by the magnetic structure controls the first armature to continue to adhere to the brake stator; at this time, the second armature does not adhere to the brake stator, forming a primary brake.

[0013] In some embodiments, when the brake stator is powered off, the magnetic structure generates a secondary magnetic field which forms a loop via the brake stator, the first armature and the second armature and the gap, and when the gap between the second armature and the brake stator is greater than or equal to a preset distance, the magnetic force between the first armature and the brake stator generated by the magnetic structure is less than the elastic force of the first elastic structure, and the first armature is pushed out by the first elastic structure to form a secondary brake.

[0014] In some embodiments, when the electromagnetic brake forms a primary brake or a secondary brake, and when the brake stator is powered on again, the brake stator generates a primary magnetic field which forms a loop via the brake stator, air, the first armature, the second armature and air, the magnetic structure generates a secondary magnetic field which forms a loop via the first armature and the second armature and air, and the primary magnetic field and the secondary magnetic field jointly control the first armature and the second armature to move to the brake stator to adhere to the brake stator.

[0015] In some embodiments, the magnetic force generated by the brake stator is greater than the elastic force of the second elastic structure, the magnetic force generated by the brake stator is greater than the elastic force of the first elastic structure, the magnetic force generated by the magnetic structure is greater than the elastic force of the first elastic structure when the gap is less than a preset distance, and the magnetic force generated by the magnetic structure is less than the elastic force of the first elastic structure when the gap is greater than or equal to a preset distance.

[0016] In some embodiments, the radial outer circumferential wall of the second armature and the radial inner circumferential wall of the first armature are gap-fitted, and the gap amount is ≤0.1mm.

[0017] In some embodiments, the brake stator is internally provided with a first accommodating hole extending from the interior of the brake stator to a first axial end face of the brake stator opposite to the second armature, the inner diameter of the second armature is smaller than the hole diameter of the first accommodating hole, the outer diameter of the second armature is larger than the hole diameter of the first accommodating hole, the second elastic structure is arranged in the first accommodating hole, and one end of the second elastic structure abuts against the groove bottom of the first accommodating hole and the other end abuts against the second armature to provide elastic thrust to the second armature.

[0018] In some embodiments, the first accommodating hole is a cylindrical hole with a center line coinciding with the central axis of the brake stator, the center hole of the second armature has a center line coinciding with the central axis, and the second elastic structure is a spring.

[0019] In some embodiments, the brake stator is internally further provided with a second accommodating hole extending from the interior of the brake stator to the first axial end face of the brake stator and opposite to the solid part between the radial inner and outer periphery of the first armature, one end of the first elastic structure abuts against the groove bottom of the second accommodating hole and the other end abuts against the first armature to provide elastic thrust to the first armature.

[0020] In some embodiments, the first armature is a split structure including a first armature one and a first armature two, the first armature one and the first armature two are spliced together, and the magnetic structure is arranged between the first armature one and the first armature two.

[0021] In some embodiments, the first armature one and the first armature two are arranged in abutment along the axial direction of the first armature, the first armature one is provided with a first groove at the axial end face facing the first armature two, the first armature two is provided with a second groove at the axial end face facing the first armature one, the first groove and the second groove are connected in abutment to form a groove accommodating the magnetic structure, and part of the magnetic structure is arranged in the first groove and the other part is arranged in the second groove.

[0022] In some embodiments, the first groove and the second groove are both annular groove structures, the magnetic structure is also an annular structure, the magnetic structure is a permanent magnet, and the first elastic structure is a spring.

[0023] In some embodiments, the first armature one and the first armature two are connected by screws or bolts, or the first armature one and the first armature two are connected by adhesive, or the first armature one, the magnetic structure and the first armature two are integrally formed.

[0024] In some embodiments, the inner portion of the brake stator is further provided with a coil slot extending axially from the inner portion of the brake stator to the first axial end face, and a coil is arranged in the coil slot, the coil being further connected to the power supply outside the brake stator through a lead-out wire.

[0025] In some embodiments, the friction plate is of a ring structure, and the outer diameter of the friction plate is greater than the inner diameter of the first armature and less than the outer diameter of the first armature, and the inner diameter of the friction plate is less than the outer diameter of the second armature and greater than the inner diameter of the second armature; the friction plate comprises a third axial end face and a fourth axial end face at the axial two ends thereof; when only the second armature is in contact with the third axial end face of the friction plate, a first-stage braking to the friction plate is formed; when the second armature and the first armature are both in contact with the third axial end face of the friction plate, a second-stage braking to the friction plate is formed.

[0026] In some embodiments, a baffle plate and a square wheel are further included, the baffle plate is arranged at the fourth axial end face of the friction plate, the square wheel is arranged in the radial inner periphery of the friction plate, the baffle plate is also of a ring structure, the square wheel is located radially inside the baffle plate, the radial outer periphery wall of the square wheel is in contact with the radial inner periphery wall of the friction plate, so as to frictionally brake the square wheel by the friction plate, and the baffle plate limits the axial movement of the friction plate.

[0027] The application further provides an electric machine device comprising the aforementioned two-stage braking electromagnetic brake.

[0028] The two-stage braking electromagnetic brake and the electric machine device provided by the application have the following beneficial effects:

[0029] The application sets the armature as a second armature and a first armature in a split structure, sets first and second elastic structures on the brake stator respectively, and sets a magnetic structure on the first armature, so that the magnetic structure forms a magnetic field and an additional magnetic force between the brake stator and the first armature, while the second armature and the brake stator do not form an additional magnetic force (or form a very small magnetic force or close to 0), so that the second armature is directly pushed out by the second elastic structure to form a primary brake with the friction plate after the brake stator is powered off, if the gap between the second armature and the brake stator is greater than or equal to a preset distance, the magnetic force provided by the magnetic structure is not enough to overcome the elastic force of the first elastic structure, then the first armature is pushed out by the first elastic structure to combine with the friction plate to form a secondary brake, the first armature can increase the contact area between the second armature and the friction plate, thereby effectively increasing the friction braking torque (torque), effectively solving the problem that the gap gradually increases during the normal operation of the traditional brake, resulting in brake torque decay, using the magnetic circuit characteristics between the brake stator and the armature, increasing the dual-stage brake function, i.e. starting the secondary brake function to supplement the torque after the primary brake fails; ensuring the safety of the entire brake product during operation. Especially in some occasions that cannot be interrupted, it plays an important role, and the dual-stage brake structure can remind engineers to replace the brake in time. BRIEF DESCRIPTION OF DRAWINGS

[0030] Fig. 1a is a traditional brake in the prior art;

[0031] Fig. 1b is Fig. 1a is a traditional brake installation sectional view of the application;

[0032] Fig. 2 is a sectional view of the dual-stage brake electromagnetic brake of the application;

[0033] Fig. 3 is a magnetic field sectional view of the dual-stage brake electromagnetic brake of the application under the condition of coil energization;

[0034] Fig. 4 is a partial sectional view of the dual-stage brake electromagnetic brake of the application when the primary brake is in operation;

[0035] Fig. 5 is a partial sectional view of the dual-stage brake electromagnetic brake of the application when the secondary brake starts to start;

[0036] Fig. 6 is a partial sectional view of the dual-stage brake electromagnetic brake of the application when the secondary brake is executed.

[0037] The reference signs are as follows:

[0038] 1, brake stator; 2, coil; 3, friction plate; 4, baffle; 5, square wheel; 6, armature; 61, first armature; 611, first armature one; 612, first armature two; 62, second armature; 7, spring; 71, first elastic structure; 72, second elastic structure; 8, column sleeve; 9, lead-out wire; 10, motor shaft; 11, magnetic structure; 12, first containing hole; 13, first axial end face; 14, second containing hole; 15, coil slot; 100, gap; 200, main magnetic field; 300, auxiliary magnetic field. DETAILED DESCRIPTION

[0039] As Fig. 1a-1b , the traditional brake is powered off: the coil 2 is powered off, the electromagnetic force acting on the brake stator 1 disappears, the compressed spring 7 needs to recover to the original size, the compressed spring 7 releases the spring force, acts on the armature 6, and pushes the armature 6 to move towards the baffle 4, and the current armature 6 clamps the friction plate 3 with the baffle 4. The friction plate 3 is clamped on both sides due to the action of the force and friction, and a friction torque is generated. The friction torque = braking torque, at this time, the square wheel 5 linked with the friction plate 3 stops rotating, the motor shaft 10 stops rotating, and the motor is braked;

[0040] Because the braking condition is bad, such as emergency braking condition, the brake is often braked, and each time the brake is braked, the friction plate 3 will be worn. The size of the friction plate 3 becomes smaller, and the gap of the brake will become larger. When the limit size exceeds 0.5, the electromagnetic force generated by the brake stator 1 cannot attract the armature 6 to one side of the brake stator 1, and the brake fails. At the same time, because the overtravel of the spring 7 is released, the spring force generated by the spring 7 is insufficient, which indirectly leads to insufficient braking force. At this time, the position of the mechanical arm / mechanical hand relies on the brake to brake and position, and the insufficient torque will lead to inaccurate positioning, and even cause the arm to swing / drop, which has considerable serious danger to the operator / equipment / product.

[0041] As Fig. 2-6 shown, the application provides a double-stage braking electromagnetic brake, which comprises:

[0042] The brake stator 1, the first armature 61, the second armature 62, the friction plate 3, the first elastic structure 71, the second elastic structure 72 and the magnetic structure 11 are arranged in the axial direction of the brake stator 1, and the first armature 61 and the second armature 62 are located between the brake stator 1 and the friction plate 3; the first elastic structure 71 can provide elastic force to the first armature 61, the second elastic structure 72 can provide elastic force to the second armature 62, and the magnetic structure 11 can generate magnetic force (preferably magnetic attraction) between the first armature 61 and the brake stator 1;

[0043] When the brake stator 1 is powered off, the second armature 62 can be driven by the second elastic structure 72 to be attached to the friction plate 3 to form a first level brake, at this time, the second armature 62 has a gap 100 with the brake stator 1, when the gap 100 is greater than or equal to a preset distance, the magnetic force between the first armature 61 and the brake stator 1 generated by the magnetic structure 11 is smaller than the elastic force of the first elastic structure 71, and the elastic force of the first elastic structure 71 drives the first armature 61 to move to be attached to the friction plate 3 to form a second level brake.

[0044] The application can form a magnetic field by the magnetic structure and form an additional magnetic force between the brake stator and the first armature, while no additional magnetic force is formed between the second armature and the brake stator, so that the second armature is directly pushed out by the second elastic structure to be attached to the friction plate to form a first level brake when the brake stator is powered off, if the gap between the second armature and the brake stator is greater than or equal to a preset distance, the magnetic force provided by the magnetic structure is insufficient to overcome the elastic force of the first elastic structure, then the first armature is pushed out by the first elastic structure to be attached to the friction plate to form a second level brake, the contact area between the second armature and the friction plate can be increased by the first armature, so as to effectively increase the friction brake torque, effectively solve the problem that the gap gradually increases due to the wear of parts during the normal operation of the traditional brake, and the brake torque decays, the magnetic circuit characteristics between the brake stator and the armature are utilized to increase the double level brake function, that is, the second level brake function is started after the first level brake fails, and the torque is supplemented; the safety of the entire brake product during operation is ensured. Especially in some occasions that cannot be interrupted, it plays an important role, and the double level brake structure can remind the engineering personnel to replace the brake in time.

[0045] In some embodiments, the first armature 61 and the second armature 62 are both annular structures, the first armature 61 is sleeved on the radial outer periphery of the second armature 62 (the first armature is preferably an outer armature, and the second armature is preferably an inner armature), the first elastic structure 71 is arranged on the brake stator 1 and only provides an elastic force for the first armature 61, the second elastic structure 72 is arranged on the brake stator 1 and only provides an elastic force for the second armature 62, and the magnetic structure 11 is arranged on the first armature 61.

[0046] This is the preferred structural form and relative position of the first and second armatures of the present invention, as well as the placement positions of the first and second elastic structures and the magnetic structure. The first elastic structure provides elastic force to the first armature, the second elastic structure provides elastic force to the second armature, and the magnetic structure provides magnetic force to the first armature as much as possible. The magnetic force on the second armature from the magnetic structure is small or close to 0.

[0047] In addition to being placed on the outer armature as mentioned above, the magnetic structure can also be placed on the inner armature. In this case, the outer armature forms a primary braking mechanism, and the inner armature forms a secondary braking mechanism.

[0048] This invention relates to a two-stage electromagnetic brake that requires no external control module. It assists engineers in determining the brake's operational status while ensuring that the braking torque does not decrease. Even when the brake clearance increases beyond a set range, it still guarantees brake safety. The improvements of this invention are as follows:

[0049] 1. This invention designs a two-stage braking structure. Through the two-stage braking structure of the first and second armatures, and utilizing the magnetic circuit characteristics between the brake stator and armature, a two-stage braking function is added. That is, after the first-stage braking fails, the second-stage braking function is activated to supplement torque, ensuring that the braking torque does not decrease even when the friction pads wear and the gap between them and the armature increases; thus guaranteeing the safety of the entire brake product during operation. It plays a particularly important role in situations where uninterrupted operation is not possible.

[0050] 2. The dual-stage braking function serves as a reminder to engineers to replace the brakes in a timely manner. (Explanation: During the first braking action, the second armature impacts the friction pads with a spring, producing one sound; during the second braking action, the first armature sub-impacts the friction pads, producing a second sound. These two consecutive sounds serve as a reminder to relevant personnel that the brakes need replacement.) (This reminds workers that the friction pads are thin and need replacing, or that the friction pads, baffles, and armatures need to be replaced, or that the entire brake needs to be replaced.)

[0051] This invention solves the following technical problems:

[0052] 1. During normal operation of a traditional brake, wear of components leads to a gradual increase in clearance, resulting in a decrease in braking torque;

[0053] 2. Traditional brakes do not have a torque-increasing function; the brake continues to operate even after the torque has decreased, until it is scrapped; this operation is harmful to personnel / equipment / products.

[0054] 3. Traditional brakes cannot assist engineers in replacing brakes; this function is not available.

[0055] In some embodiments, when the brake stator 1 is powered, the main magnetic field 200 generated thereby can form a loop via the brake stator 1, the first armature 61 and the second armature 62, and the secondary magnetic field 300 generated by the magnetic structure 11 also forms a loop via the brake stator 1, the first armature 61 and the second armature 62, at this time the first armature 61 and the second armature 62 are both in contact with the brake stator 1. This is the preferred structure of the brake stator of the present application when it is powered, i.e. the main magnetic field 200 generated thereby can form a loop via the brake, the first armature and the second armature, while providing magnetic force to the first armature and the second armature, the second armature is magnetically attracted to the brake stator against the elastic force of the second elastic structure, the first armature is magnetically attracted to the brake stator against the elastic force of the first elastic structure under the simultaneous action of the main magnetic field 200 and the secondary magnetic field 300 provided by the magnetic structure, at this time the first and second armatures are both not in contact with the friction plate, and the friction plate rotates together with the square wheel and the motor shaft.

[0056] When the two-stage brake coil is powered, the direction of the magnetic field generated by the coil 2 of the brake stator 1 coincides with the magnetic field generated by the annular magnetic steel (magnetic structure 11), and the generated attractive force is greater than the elastic force of the inner and outer springs, so the first armature and the second armature are both attracted. The friction plate 3 is in a released state, and the motor is free to rotate.

[0057] In some embodiments, when the brake stator 1 is powered off, there is no magnetic force between the second armature 62 and the brake stator 1, the second armature 62 is pushed out by the second elastic structure 72 to form the gap 100 between the second armature 62 and the brake stator 1, the secondary magnetic field 300 generated by the magnetic structure 11 forms a loop via the brake stator 1, the first armature 61 and the second armature 62 and the gap 100, and when the gap 100 is less than a predetermined distance, the magnetic force between the first armature 61 and the brake stator 1 generated by the magnetic structure 11 is greater than the elastic force of the first elastic structure 71, and the magnetic force generated by the magnetic structure 11 controls the first armature 61 to continue to be in contact with the brake stator 1; at this time the second armature 62 is not in contact with the brake stator 1, forming a one-stage brake.

[0058] This is the preferred structural form of the present invention when the brake stator is de-energized and the gap between the friction plate and the second armature is small. When the brake stator is de-energized, the main magnetic field 200 it provides disappears. At this time, the second armature is pushed out by the elastic thrust of the second elastic structure, and then comes into contact with the friction plate to generate a braking torque on the friction plate, preventing the friction plate from rotating and generating a first-stage braking on the motor shaft. When the second armature is pushed out so that the gap between it and the brake stator is less than a preset distance (since the second armature needs to move to contact the friction plate, the gap between the friction plate and the second armature is equal to the gap), the secondary magnetic field generated by the magnetic structure can form a loop between the first armature, the second armature, the gap and the brake stator. However, because the gap is small, the magnetic resistance is small, and the magnetic force between the first armature and the stator generated by the magnetic structure is large, so as to effectively overcome the elastic force of the first elastic structure and continue to attract the first armature to the stator. At this time, only the second armature comes into contact with the friction plate, generating a first-stage braking.

[0059] When the coil of the present invention is de-energized (in) Fig. 3 In the event of a power outage Fig. 4 When the magnetic field generated by the first armature 61 still exists, part of the magnetic circuit passes through the second armature 62. The spring force generated by the outer spring (first elastic structure 71) is less than the attraction force generated by the first armature 61. The outer spring is in a compressed state, and the gap between the first armature 61 and the stator is 0. At this time, no magnetic field is generated in the second armature 62 (that is, it does not have a magnetic structure inside, the second armature itself does not generate a magnetic field, and the magnetic force between the second armature and the stator generated by the magnetic field generated by the first armature is very small, close to 0). Therefore, the attraction force of the second armature 62 on the brake stator 1 is close to 0. The spring force generated by the inner spring (second elastic structure 72) pushes the second armature 62 towards the baffle 4, thereby causing the friction pads to rub and generate braking force, forming a first-stage braking.

[0060] In some embodiments, when the brake stator 1 is de-energized, the secondary magnetic field 300 generated by the magnetic structure 11 forms a loop through the brake stator 1, the first armature 61 and the second armature 62 and the gap 100. When the gap 100 between the second armature 62 and the brake stator 1 is greater than or equal to a preset distance, the magnetic force between the first armature 61 and the brake stator 1 generated by the magnetic structure 11 is less than the elastic force of the first elastic structure 71. The first armature 61 is pushed out by the first elastic structure 71 to form a secondary braking.

[0061] This is the preferred structure of the brake stator of the present application when the gap between the friction plate and the second armature is large after the brake stator is powered off. When the brake stator is powered off, the main magnetic field 200 provided by the brake stator disappears, and the second armature is pushed out by the elastic thrust of the second elastic structure, and then adheres to the friction plate to generate a braking torque on the friction plate, preventing the friction plate from rotating and generating a primary brake on the motor shaft. When the second armature is pushed out so that the gap between the second armature and the brake stator is greater than or equal to the preset distance (since the second armature moves to the friction plate, the gap between the friction plate and the second armature is equal to the gap), the secondary magnetic field generated by the magnetic structure can form a loop between the first armature, the second armature, the gap and the brake stator. However, due to the large gap leading to large magnetic resistance, the magnetic force between the first armature and the stator generated by the magnetic structure is small, so it cannot overcome the elastic force of the first elastic structure, and therefore the first armature cannot be attracted to the stator. At this time, the first armature is also pushed out by the first elastic structure to contact the friction plate, so that the second armature and the first armature adhere to the friction plate, effectively increasing the brake contact area and improving the braking torque, generating a secondary brake.

[0062] When the friction plate is severely worn, i.e. the second armature 62 moves a distance greater than or equal to the set gap, the relative displacement of the second armature 62 to the first armature 61 is increased Fig. 5 , at this time the magnetic field generated by the first armature 61 cannot form a loop through the second armature 62, the magnetic resistance is large, and the magnetic attraction force is small; at this time the spring force generated by the outer spring (first elastic structure 71) > the attraction force generated by the first armature 61. The first armature 61 is pushed by the outer spring and moves in the direction of the friction plate 3 under the action of the spring force. The spatial position is consistent with the second armature 62, at this time the magnetic circuit of the first armature 61 is connected to the second armature 62.

[0063] In some embodiments, when the electromagnetic brake forms a primary brake or a secondary brake, and when the brake stator 1 is powered again, the main magnetic field 200 generated by the brake stator 1 can form a loop through the brake stator 1, air, the first armature 61, the second armature 62 and air, the secondary magnetic field 300 generated by the magnetic structure forms a loop through the first armature 61 and the second armature 62 and air, and the main magnetic field 200 and the secondary magnetic field 300 jointly control the first armature 61 and the second armature 62 to move to the brake stator 1 and adhere to the brake stator 1.

[0064] This is the preferred structure of the electromagnetic brake of the present application when re-energized after braking, at this time the secondary magnetic field generated by the magnetic structure can form a loop between the first armature, the second armature and the air, generating a magnetic force between the first armature and the stator, so that the magnetic force of the main magnetic field 200 directly on the first armature and the second armature and the magnetic force of the secondary magnetic field on the first armature together act to attract the first armature and the second armature back, so that during the return of the armature, the magnetic loop generated between the first armature and the second armature and the magnetic force of the stator together provide the return magnetic force, effectively increasing the return force on the first armature, improving energy efficiency, and resetting more quickly.

[0065] When the coil 2 of the present application is re-energized, the second armature 62 and the first armature 61 are attracted to the stator side at the same time; when re-disconnected, the second armature and the first armature will act in turn, and the friction plate will be subjected to primary braking or secondary braking according to the interval distance between the friction plate and the armature.

[0066] In some embodiments, the magnetic force generated by the brake stator 1 is greater than the elastic force of the second elastic structure 72, the magnetic force generated by the brake stator 1 is greater than the elastic force of the first elastic structure 71, when the gap is less than the preset distance, the magnetic force generated by the magnetic structure 11 is greater than the elastic force of the first elastic structure 71, when the gap is greater than or equal to the preset distance, the magnetic force generated by the magnetic structure 11 is less than the elastic force of the first elastic structure 71.

[0067] The relationship between the magnetic force of the brake stator of the application and the first elastic force and the second elastic force respectively and the relationship between the magnetic structure and the first elastic force, the magnetic force of the brake stator of the application is greater than the elastic force of the second elastic structure, which can effectively overcome the second elastic force by the energized coil to effectively attract the second armature back without contacting the friction plate, which is suitable for the normal working condition of the motor, and the magnetic force of the brake stator is also set to be greater than the elastic force of the first elastic structure, which can effectively overcome the first elastic force by the energized coil to effectively attract the first armature back without contacting the friction plate, which is also suitable for the normal working condition of the motor (the application only needs to set the elastic force of the first elastic structure to be less than the magnetic force of the stator + the magnetic force of the magnetic structure to meet the demand, but the application preferably sets the first elastic force to be less than the magnetic force of the stator, which can maximize the ability to attract the first armature back and meet the requirements of normal motor operation); the magnetic force of the magnetic structure is set to be greater than the first elastic force when the gap is less than the preset distance, and less than the first elastic force when the gap is greater than or equal to the preset distance, which can set the magnetic structure and the first elastic structure according to the interval distance between the friction plate and the armature in the actual working condition, effectively ensure that the working condition above the interval distance automatically executes the secondary braking, and the working condition below the interval distance automatically executes the primary braking, which meets the demand of the actual motor working condition. The problem of gradual increase of the gap caused by wear of the parts during the normal operation of the traditional brake, resulting in the attenuation of the braking torque.

[0068] In some embodiments, the radial outer peripheral wall of the second armature 62 is in clearance fit with the radial inner peripheral wall of the first armature 61, and the clearance amount is ≤0.1mm. The clearance amount of the application needs to be controlled to avoid too large gap, large air magnetic resistance, poor magnetic conduction effect between the second armature and the first armature, and wear power consumption caused by relative movement between the second armature and the first armature.

[0069] The application develops a two-stage brake with double braking function; the armature 6 is divided into two sections, namely the second armature 62 (inner ring, ring shape) and the first armature 61 (outer ring, ring shape), which are in clearance fit and do not interfere with each other, and the clearance amount is ≤0.1. The structure of the spring (i.e. the second elastic structure 72) is added to the brake stator 1; together with the outer spring (the first elastic structure 71), it plays a role in applying spring force.

[0070] In some embodiments, the brake stator 1 is internally provided with a first accommodating hole 12 extending from the inside of the brake stator 1 to a first axial end face 13 of the brake stator 1 opposite to the second armature 62, the inner diameter of the second armature 62 is smaller than the hole diameter of the first accommodating hole 12, the outer diameter of the second armature 62 is larger than the hole diameter of the first accommodating hole 12, the second elastic structure 72 is arranged in the first accommodating hole 12, and one end of the second elastic structure 72 abuts against the bottom of the first accommodating hole 12 and the other end abuts against the second armature 62 to provide elastic thrust to the second armature 62. This is the preferred structure between the brake stator, the second elastic structure and the second armature of the application, that is, the second elastic structure is arranged in the first accommodating hole, the hole diameter of the first accommodating hole is between the outer diameter and the inner diameter of the second armature, so that the second elastic structure in the first accommodating hole can effectively act on the second armature to provide elastic thrust.

[0071] In some embodiments, the first accommodating hole 12 is a cylindrical hole with its center line coinciding with the central axis of the brake stator 1, the center line of the center hole of the second armature 62 coincides with the central axis, and the second elastic structure 72 is a spring. The first accommodating hole of the application is preferably a cylindrical hole coaxial with the central axis of the brake stator, the second armature is also a cylindrical ring structure coaxial with the central axis, capable of accommodating the motor shaft passing therethrough, and the second elastic structure is preferably a spring capable of providing elastic thrust to the second armature by compression.

[0072] In some embodiments, the inside of the brake stator 1 is further provided with a second accommodating hole 14 extending from the inside of the brake stator 1 to the first axial end face 13 of the brake stator 1, and the second accommodating hole 14 is opposite to the solid part between the radial inner and outer circumferences of the first armature 61, one end of the first elastic structure 71 abuts against the bottom of the second accommodating hole 14 and the other end abuts against the first armature 61 to provide elastic thrust to the first armature 61.

[0073] This is the preferred structure between the brake stator, the first elastic structure and the first armature of the application, that is, the first elastic structure is arranged in the second accommodating hole, and the second accommodating hole is opposite to the solid part of the first armature to enable the first elastic structure in the second accommodating hole to effectively act on the second armature to provide elastic thrust.

[0074] In some embodiments, the first armature 61 is a split structure, comprising a first armature one 611 and a first armature two 612, the first armature one 611 and the first armature two 612 are spliced together, and the magnetic structure 11 is arranged between the first armature one 611 and the first armature two 612. The first armature of the present application preferably has a split structure, comprising a first armature one and a first armature two, which can effectively arrange the magnetic structure between the first armature one and the first armature two.

[0075] In some embodiments, the first armature one 611 and the first armature two 612 are arranged along the axial direction of the first armature, and the first armature one 611 is provided with a first groove at the axial end surface facing the first armature two 612, and the first armature two 612 is provided with a second groove at the axial end surface facing the first armature one 611, the first groove and the second groove are connected oppositely to form a groove accommodating the magnetic structure 11, part of the magnetic structure 11 is arranged in the first groove, and the other part is arranged in the second groove. This is a further preferred structure of the split structure of the first armature of the present application, that is, the first and second grooves are spliced to accommodate the magnetic structure in the two grooves, and the setting and fixing of the magnetic structure are completed.

[0076] In some embodiments, the first groove and the second groove are both annular groove structures, and the magnetic structure 11 is also an annular structure; the magnetic structure 11 is a permanent magnet; and the first elastic structure 71 is a spring. The further preferred two grooves of the present application are annular groove structures, and the magnetic structure is also an annular structure, which can provide magnetic force between the first armature and the stator in the circumferential direction, the magnetic structure is a permanent magnet which can always provide a secondary magnetic field, and the first elastic structure is preferably a spring which can provide elastic thrust through compression of the spring.

[0077] In some embodiments, the first armature one 611 and the first armature two 612 are connected by screws or bolts, or the first armature one 611 and the first armature two 612 are connected by adhesive, or the first armature one 611, the magnetic structure 11 and the first armature two 612 are integrally formed. The first armature of the split structure of the present application can be connected by threaded fasteners, or bonded, or integrally formed, which can realize an integral structure.

[0078] The first armature 61 of the present application is embedded with an annular magnetic steel (magnetic structure 11), which is radially divided into the first armature 61, and the embedded magnetic steel has an embedded thickness size of 3:1. The annular magnetic steel can be combined with the first armature 61 by interference / gumming, and embedded therein.

[0079] In some embodiments, the brake stator 1 is further provided with a coil slot 15 in the interior of the brake stator 1, the coil slot 15 extends to the first axial end face 13 from the interior of the brake stator 1 in the axial direction, and a coil 2 is arranged in the coil slot 15, and the coil 2 is further connected to the power supply outside the brake stator 1 through the lead-out wire 9. The interior of the brake stator of the present application can be provided with a coil through the coil slot, so as to provide a main magnetic field through the energization of the coil, and to provide a magnetic force to the second armature and the first armature respectively, thereby achieving the effect of releasing the brake.

[0080] In some embodiments, the friction plate 3 is in a ring structure, and the outer diameter of the friction plate 3 is greater than the inner diameter of the first armature 61 and less than the outer diameter of the first armature 61, and the inner diameter of the friction plate 3 is less than the outer diameter of the second armature 62 and greater than the inner diameter of the second armature 62; the friction plate 3 comprises a third axial end face and a fourth axial end face at the axial two ends thereof; when only the second armature 62 is in contact with the third axial end face of the friction plate 3, a first level brake to the friction plate 3 is formed; when the second armature 62 and the first armature 61 are both in contact with the third axial end face of the friction plate 3, a second level brake to the friction plate 3 is formed. This is a further preferred structure of the friction plate of the present application, through the ring structure, and the outer diameter thereof is between the inner and outer diameters of the first armature, and the inner diameter thereof is between the inner and outer diameters of the second armature, so as to be able to contact the friction plate through the second armature respectively and simultaneously, to provide a brake torque to the friction plate, to prevent the friction plate from rotating, and to effectively complete the formation of the follow-up gap size to the first and second level brakes to the friction plate, to solve the problem that the gradual increase of the gap caused by the wear of the parts during the normal operation of the traditional brake will cause the brake torque to decay, to solve the problem that the traditional brake has no torque increasing function, and to solve the problem that the traditional brake cannot assist the engineering personnel to replace the brake.

[0081] In some embodiments, further comprising a baffle plate 4 and a square wheel 5, the baffle plate 4 is arranged at the fourth axial end face of the friction plate 3, the square wheel 5 is arranged at the radial inner periphery of the friction plate 3, the baffle plate 4 is also in a ring structure, the square wheel 5 is located at the radial inner side of the baffle plate 4, the radial outer periphery wall of the square wheel 5 is in contact with the radial inner periphery wall of the friction plate 3, so as to frictionally brake the square wheel 5 through the friction plate 3, and the baffle plate 4 limits the axial movement of the friction plate 3. This is a further preferred structure of the two-stage brake of the present application, the baffle plate can limit the axial movement of the friction plate, the friction plate is fixedly sleeved on the outer periphery of the square wheel (preferably with an interference fit), the rotation of the square wheel can drive the rotation of the friction plate, and the rotation of the friction plate is braked through the two-stage brake structure of the second armature and the first armature, thereby driving the brake effect of the square wheel or even the motor shaft.

[0082] The application also provides a motor device comprising the double-stage brake electromagnetic brake of any one of the preceding.

[0083] The double-stage brake of the application is autonomously started only when the braking force generated by the second armature 62 and the friction plate 3 is insufficient, and after starting, the first armature 61 and the outer spring (first elastic structure 71) generate a braking force that instantaneously supplements the braking force generated by the second armature 62 and the inner spring (second elastic structure 72) and the friction plate 3 (first-stage braking force). The double-stage braking force meets the normal requirements of the motor, and prolongs the safety of the servo system and the stability of the equipment under specific working conditions (such as a production line that cannot be stopped, a specific requirement that cannot be stopped). When starting, the sound of the two armatures and the friction plate will be obviously generated twice, and at this time, the engineering personnel can determine the abnormality of the brake according to the sound of the double-stage braking, and prepare to replace the brake.

[0084] The above only describes the preferred embodiments of the application and is not intended to limit the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application. The above only describes the preferred embodiments of the application, and it should be noted that, for ordinary skilled persons in the art, without departing from the technical principles of the application, a number of improvements and modifications can be made, and these improvements and modifications shall be regarded as the protection scope of the application.

Claims

1. A two-stage braking electromagnetic brake, characterized by: The brake stator (1), the first armature (61), the second armature (62), the friction plate (3), the first elastic structure (71), the second elastic structure (72) and the magnetic structure (11), in the axial direction of the brake stator (1), the first armature (61) and the second armature (62) are located between the brake stator (1) and the friction plate (3); the first elastic structure (71) can provide elastic force to the first armature (61), the second elastic structure (72) can provide elastic force to the second armature (62), and the magnetic structure (11) can generate magnetic force between the first armature (61) and the brake stator (1); When the brake stator (1) is powered off, the second armature (62) can be driven to be attached to the friction plate (3) to form a primary brake, at this time the second armature (62) and the brake stator (1) generate a gap (100), when the gap (100) is greater than or equal to a preset distance, the magnetic force generated by the magnetic structure (11) between the first armature (61) and the brake stator (1) is less than the elastic force of the first elastic structure (71), and the elastic force of the first elastic structure (71) drives the first armature (61) to move to be attached to the friction plate (3) to form a secondary brake.

2. The dual-stage braking electromagnetic brake according to claim 1, wherein: The first armature (61) and the second armature (62) are both annular structures, and the first armature (61) is arranged at the radial outer periphery of the second armature (62), the first elastic structure (71) is arranged on the brake stator (1) and only provides elastic force to the first armature (61), the second elastic structure (72) is arranged on the brake stator (1) and only provides elastic force to the second armature (62), and the magnetic structure (11) is arranged on the first armature (61).

3. The dual-stage braking electromagnetic brake according to claim 1, wherein: When the brake stator (1) is powered on, the main magnetic field (200) generated thereby can form a loop via the brake stator (1), the first armature (61) and the second armature (62), and the secondary magnetic field (300) generated by the magnetic structure (11) also forms a loop via the brake stator (1), the first armature (61) and the second armature (62), at this time the first armature (61) and the second armature (62) are both attached to the brake stator (1).

4. The dual-stage braking electromagnetic brake according to claim 1, wherein: ​ When the brake stator (1) is powered off, the second armature (62) and the brake stator (1) do not have a magnetic force, the second armature (62) is pushed out by the second elastic structure (72) to form the gap (100) between the brake stator (1), the secondary magnetic field (300) generated by the magnetic structure (11) forms a loop via the brake stator (1), the first armature (61) and the second armature (62) and the gap (100), and when the gap (100) is less than a predetermined distance, the magnetic force between the first armature (61) and the brake stator (1) generated by the magnetic structure (11) is greater than the elastic force of the first elastic structure (71), and the magnetic force generated by the magnetic structure (11) controls the first armature (61) to continue to adhere to the brake stator (1); At this time, the second armature (62) does not adhere to the brake stator (1), forming a primary brake.

5. The dual-stage braking electromagnetic brake of claim 1, wherein: When the brake stator (1) is powered off, the secondary magnetic field (300) generated by the magnetic structure (11) forms a loop via the brake stator (1), the first armature (61) and the second armature (62) and the gap (100), and the gap (100) between the second armature (62) and the brake stator (1) is greater than or equal to a predetermined distance, the magnetic force between the first armature (61) and the brake stator (1) generated by the magnetic structure (11) is less than the elastic force of the first elastic structure (71), and the first armature (61) is pushed out by the first elastic structure (71) to form a secondary brake.

6. The dual-stage braking electromagnetic brake of claim 1, wherein: When the electromagnetic brake forms a primary brake or a secondary brake, and when the brake stator (1) is powered on again, the primary magnetic field (200) generated by the brake stator (1) can form a loop via the brake stator (1), air, the first armature (61), the second armature (62) and air, the secondary magnetic field (300) generated by the magnetic structure forms a loop via the first armature (61) and the second armature (62) and air, and the primary magnetic field (200) and the secondary magnetic field (300) jointly control the first armature (61) and the second armature (62) to move to the brake stator (1) to adhere to the brake stator (1).

7. The dual-stage braking electromagnetic brake of claim 1, wherein: The magnetic force generated by the brake stator (1) is greater than the elastic force of the second elastic structure (72), the magnetic force generated by the brake stator (1) is greater than the elastic force of the first elastic structure (71), when the gap is less than the preset distance, the magnetic force generated by the magnetic structure (11) is greater than the elastic force of the first elastic structure (71), when the gap is greater than or equal to the preset distance, the magnetic force generated by the magnetic structure (11) is less than the elastic force of the first elastic structure (71).

8. The dual-stage braking electromagnetic brake of claim 2, wherein: The radial outer circumferential wall of the second armature (62) and the radial inner circumferential wall of the first armature (61) are in clearance fit, and the clearance amount is ≤0.1mm.

9. The dual-stage braking electromagnetic brake of claim 2, wherein: The brake stator (1) is internally provided with a first accommodating hole (12), the first accommodating hole (12) extends from the inside of the brake stator (1) to the first axial end face (13) of the brake stator (1), the first axial end face (13) is opposite to the second armature (62), the inner diameter of the second armature (62) is smaller than the hole diameter of the first accommodating hole (12), the outer diameter of the second armature (62) is greater than the hole diameter of the first accommodating hole (12), the second elastic structure (72) is arranged in the first accommodating hole (12), and one end of the second elastic structure (72) abuts against the groove bottom of the first accommodating hole (12) and the other end is connected with the second armature (62) to provide elastic thrust to the second armature (62).

10. The dual-stage braking electromagnetic brake of claim 9, wherein: The first accommodating hole (12) is a cylindrical hole, the center line of which coincides with the center axis of the brake stator (1), the center line of the center hole of the second armature (62) coincides with the center axis, and the second elastic structure (72) is a spring.

11. The dual-stage braking electromagnetic brake of claim 9, wherein: The inside of the brake stator (1) is further provided with a second accommodating hole (14), the second accommodating hole (14) extends from the inside of the brake stator (1) to the first axial end face (13) of the brake stator (1), and the second accommodating hole (14) is opposite to the solid part between the radial inner and outer circumferential walls of the first armature (61), one end of the first elastic structure (71) abuts against the groove bottom of the second accommodating hole (14) and the other end is connected with the first armature (61) to provide elastic thrust to the first armature (61).

12. The dual-stage braking electromagnetic brake of claim 11, wherein: The first armature (61) is a split structure, comprising a first armature one (611) and a first armature two (612), the first armature one (611) and the first armature two (612) are spliced together, and the magnetic structure (11) is arranged between the first armature one (611) and the first armature two (612).

13. The dual-stage braking electromagnetic brake of claim 12, wherein: The first armature one (611) and the first armature two (612) are arranged along the axial direction of the first armature, and the axial end surface of the first armature one (611) facing the first armature two (612) is provided with a first groove, and the axial end surface of the first armature two (612) facing the first armature one (611) is provided with a second groove, the first groove and the second groove are connected to form a groove accommodating the magnetic structure (11), part of the magnetic structure (11) is arranged in the first groove, and the other part is arranged in the second groove.

14. The dual-stage braking electromagnetic brake of claim 13, wherein: The first groove and the second groove are both annular groove structures, and the magnetic structure (11) is also an annular structure; the magnetic structure (11) is a permanent magnet; and the first elastic structure (71) is a spring.

15. The dual-stage braking electromagnetic brake of claim 12, wherein: The first armature one (611) and the first armature two (612) are connected by screws or bolts, or the first armature one (611) and the first armature two (612) are connected by adhesive, or the first armature one (611), the magnetic structure (11) and the first armature two (612) are integrally formed.

16. The dual-stage braking electromagnetic brake of claim 9, wherein: The inside of the brake stator (1) is further provided with a coil groove (15), the coil groove (15) extends from the inside of the brake stator (1) to the first axial end surface (13) along the axial direction, and a coil (2) is arranged in the coil groove (15), and the coil (2) is further connected to the power supply outside the brake stator (1) through a lead-out wire (9).

17. The dual-stage braking electromagnetic brake of any one of claims 1-16, wherein: The friction plate (3) is annular structure, and the outer diameter of the friction plate (3) is greater than the inner diameter of the first armature (61) and less than the outer diameter of the first armature (61), the inner diameter of the friction plate (3) is less than the outer diameter of the second armature (62) and greater than the inner diameter of the second armature (62); the friction plate (3) includes third and fourth axial end faces at its axial ends; when only the second armature (62) is in contact with the third axial end face of the friction plate (3), a first level brake is formed for the friction plate (3); when the second armature (62) and the first armature (61) are both in contact with the third axial end face of the friction plate (3), a second level brake is formed for the friction plate (3).

18. The dual-stage brake electromagnetic brake of claim 17, further comprising: Further comprising a baffle plate (4) and a square wheel (5), the baffle plate (4) is arranged at the fourth axial end face of the friction plate (3), the square wheel (5) is arranged in the radial inner periphery of the friction plate (3), and the baffle plate (4) is also annular structure, the square wheel (5) is located radially inside the baffle plate (4), the radial outer periphery wall of the square wheel (5) is in contact with the radial inner periphery wall of the friction plate (3), so as to frictionally brake the square wheel (5) by the friction plate (3), and the baffle plate (4) limits the axial movement of the friction plate (3).

19. An electric machine arrangement, characterized by: The dual-stage brake electromagnetic brake of any one of claims 1-18.

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