Rotor and brake motor

Abstract

A plurality of diversion strips are embedded on the excircle of an iron core of the rotor along the axial direction, the left and right ends of the diversion strips are connected with collector rings, the right collector ring comprises a ring body, a plurality of teeth symmetrically extend on the excircle of the ring body along the radial direction, the right ends of the diversion strips are connected with the side surfaces of the teeth, and the height of the teeth is greater than that of the diversion strips. The flow guide strips are located above the teeth. When the motor is powered on, rotor current generates an axial magnetic field on the right collector ring, the magnetic field can attract a disc-shaped armature sleeving the rotating shaft, and a spring is arranged between the right end face of the rotor and the armature. After the motor is powered off, the spring pushes the armature to make contact with the right end cover of the motor for braking. The rotor has the beneficial effects that the rotor changes a traditional collector ring and adopts a right collector ring structure, so that the rotor has a sucker function, a sucker can be omitted and the manufacturing cost can be reduced when the rotor is applied to a brake motor, and the electric energy consumption can be greatly reduced because the current of a magnetic field is generated by means of the current of the rotor.

Description

Technical Field

[0001] The present invention relates to a rotor and also to a brake motor using the rotor. Background Art

[0002] A brake motor consists of a motor and a brake mechanism. When the motor stops, it quickly stops the rotor. The brake mechanism includes an electromagnet, a brake, and a spring. When the motor is powered, the electromagnet is energized, engaging the electromagnet and compressing the spring, releasing the brake and freeing the rotor. When the motor is powered off, the electromagnet loses power, releasing the electromagnet, releasing the spring, and releasing the brake, effectively stopping the rotor. The electromagnet consists of a suction cup and an armature. The suction cup generates a magnetic field that attracts the armature. The high cost of the suction cup increases the manufacturing cost of the brake motor. Furthermore, the suction cup consumes energy while the motor is running.

[0003] Usually, the braking device of a brake motor is installed outside the motor body, which requires the installation of components to support the braking device; in order to avoid harm to people when the braking device is activated, the braking device needs to be installed with a protective cover, which takes up a large space. Summary of the Invention

[0004] In order to reduce the manufacturing cost of the brake motor and reduce the power consumption of the motor during operation, the present invention proposes a rotor having the function of a suction cup. The brake motor using the rotor can omit the suction cup.

[0005] The technical solution of the present invention is a rotor, which includes an iron core 6 formed by stacking silicon steel sheets, and a plurality of guide bars 7 are axially embedded on the outer circle of the iron core, the left end of the guide bar is connected to the left slip ring 4, and the right end of the guide bar is connected to the right slip ring 8. It is characterized in that the right slip ring includes a ring body 17, and a plurality of teeth 16 extend radially symmetrically along the outer circle of the ring body, the number of teeth is equal to the guide bar, the right end of the guide bar is connected to the side of the tooth, the height of the tooth is greater than the height of the guide bar, the guide bar is located on the upper part of the tooth, and the outer edge of the guide bar is flush with the top of the tooth 16.

[0006] The beneficial effect is that the rotor modifies the traditional slip ring and adopts a right slip ring structure. The rotor current enters the teeth and ring of the right slip disk, which will generate a magnetic field, giving the rotor a suction cup function. The suction cup can be omitted when used in a brake motor. Since the current that generates the magnetic field is assisted by the rotor current, the energy consumption can be greatly reduced; the right slip ring and guide bar that generate the magnetic field can be formed by cast aluminum, and the manufacturing cost of the rotor is limited.

[0007] A brake motor includes the above-mentioned rotor, which is inserted into the stator 5, and the stator is fixed to the inner wall of the casing 3. The two ends of the casing are respectively connected to the left end cover 2 and the right end cover 12. The left and right ends of the rotor shaft 1 are supported in the left and right end covers respectively through bearings 14. It is characterized in that a disc-shaped armature 9 is fitted on the spline shaft 15 on the right part of the shaft, the outer diameter of the left end of the armature is equal to the outer diameter of the rotor, the inner diameter of the recessed part of the armature is smaller than the inner diameter of the right collector ring, a spring 13 is fitted on the shaft, the spring is located between the right end face of the rotor and the recessed bottom of the armature, the right end of the armature has a frustum 10, and the inner end face of the right end cover 12 extends to the left with a friction ring 11, and the left end of the friction ring has an inner cone 11 that matches the frustum 10.

[0008] Its beneficial effects are that the left end ring surface of the armature is parallel to the right end surface of the rotor, and the ring surface area of ​​the left end of the armature is larger than the ring surface area of ​​the right slip ring, providing a magnetic circuit with low magnetic resistance for the magnetic field generated by the right slip ring, that is, the direction of the magnetic lines of force is axial between the armature and the rotor, with less leakage magnetic flux, and the energy of the rotor current can be fully utilized; the contact surface between the armature and the friction ring is a conical surface, which can generate a large friction force and stop the rotor quickly; the braking device is arranged in the casing, which reduces the volume of the brake motor and the consumption of raw materials; the traditional suction cup is eliminated, which reduces the manufacturing cost and saves the power consumption of the suction cup. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Schematic diagram of the rotor and brake motor structure.

[0010] Figure 2 This is the A-direction view of the right merge ring.

[0011] Figure 3 for Figure 2 Magnified view of section C.

[0012] The accompanying drawings are marked as follows: 1-rotating shaft, 2-left end cover, 3-housing, 4-left busbar, 5-stator, 6-iron core, 7-guide bar, 8-right busbar, 9-armature, 10-cone, 11-inner cone, 12-right end cover, 13-spring, 14-bearing, 15-spline shaft, 16-tooth, 17-ring body, 18-radial current, 19-magnetic field. DETAILED DESCRIPTION

[0013] A rotor comprises an iron core 6 formed by stacking silicon steel sheets, a plurality of guide bars 7 are embedded axially on the outer circle of the iron core, the left end of the guide bar is connected to a left slip ring 4, and the right end of the guide bar is connected to a right slip ring 8, the right slip ring, such as Figure 2As shown, it includes a ring body 15, and a plurality of teeth 16 extend radially symmetrically on the outer circle of the ring body. The number of teeth is equal to the number of guide bars. The right end of the guide bar is connected to the side of the tooth. The height of the tooth is greater than the height of the guide bar. The guide bar is located on the upper part of the tooth, and the outer edge of the guide bar is flush with the tooth top.

[0014] Its characteristic is that when the motor is running, the rotating magnetic field of the stator causes the guide bar to generate current. The left and right slip rings connect the guide bars in parallel, providing a circuit for the current in the guide bar. The current at the left end of the guide bar directly enters the ring body of the left slip ring (the left slip ring is annular), that is, the current direction is circular; while the current at the right end of the guide bar passes through the teeth and then enters the ring body of the right slip ring, such as Figure 3 As shown, the current flows radially in the right slip ring. The radial current 19 generates a magnetic field 18. The magnetic lines of force of the magnetic field surround the teeth 16. The direction of the magnetic attraction of the magnetic field is basically axial.

[0015] In addition, when the current flows in the ring body of the right slip ring, a second magnetic field 20 is generated, and the direction of the force of the second magnetic field is substantially axial.

[0016] When the current in the guide bar is constant, the magnetic attraction generated by the radial current 19 is related to the height of the tooth 16. As the height of the tooth 16 increases, the magnetic attraction of the magnetic field also increases accordingly. The height of the tooth is 2 to 3 times the height of the guide bar, preferably 3 times.

[0017] The width of the tooth 16 is equal to or greater than the width of the guide bar. Since the left bus ring, the guide bar and the right bus ring are formed by cast aluminum, appropriately increasing the width of the tooth can better clamp the iron core. For this reason, the width of the tooth 16 is 2 to 3 times the width of the guide bar 7.

[0018] A brake motor includes the above-mentioned rotor, which is inserted into the stator 5, and the stator is fixed to the inner wall of the casing 3. The two ends of the casing are respectively connected to the left end cover 2 and the right end cover 12. The left and right ends of the rotor shaft 1 are supported in the left and right end covers respectively by bearings (the bearings are angular contact ball bearings) 14. The characteristic is that a disc-shaped armature 9 is fitted on the spline shaft 15 on the right part of the shaft. The armature is made of electrical pure iron and has excellent magnetic permeability. The outer diameter of the left end of the armature is equal to the outer diameter of the rotor, and the inner diameter of the recess of the armature is equal to the inner diameter of the right slip ring. A spring 13 is sleeved on the shaft, and the spring is located between the right end face of the rotor and the recessed bottom of the armature. The right end of the armature has a frustum 10. The inner end face of the right end cover 12 is extended to the left with a friction ring 11. The left end of the friction ring has an inner cone 11 that matches the frustum 10.

[0019] The braking principle is that when the motor is powered on, the rotating magnetic field generated by the stator causes the guide bar of the rotor to generate an induced current, and the induced current generates a magnetic field on the right slip ring, such as Figure 1 and Figure 3As shown, the magnetic field lines surround the teeth of the right slip ring, and the magnetic field lines are coupled between the armature and the rotor core. The magnetic field lines 20 of the second magnetic field surround the ring body of the right slip ring, from Figure 1 It can be seen that the direction of the magnetic lines of force in the gap between the armature and the rotor core can be regarded as axial. The magnetic field attracts the armature, separating the armature from the friction ring, and at the same time compressing the spring, causing the rotor to rotate. When the motor is powered off and stops rotating, the induced current disappears, the magnetic field disappears, the spring resets, and pushes the armature to contact the friction ring. The friction between them causes the rotor to stop quickly.

[0020] The gap between the armature and the rotor core can be regarded as the magnetic resistance of the magnetic field. The smaller the gap between the armature and the rotor core, the more magnetic flux (magnetic lines of force) will be generated under a certain magnetic field strength. The gap between the armature and the right slip ring ranges from 1 to 3 mm, preferably 2 mm.

[0021] The frustum of the right end of the armature and the inner cone of the left end of the friction ring, when the width of their contact surface is constant, the smaller the cone angle between them, the greater the friction force when they are in contact. However, if the cone is too small, it will be difficult to separate them. For example, for a motor with a power of 2.2 kilowatts, the appropriate cone angle of the frustum is 45 degrees to 75 degrees, preferably 60 degrees, and the contact surface width between the frustum and the friction ring is 30 mm to 50 mm, preferably 40 mm.

Claims

1. A rotor comprising an iron core (6) formed by stacking silicon steel sheets, a plurality of guide bars (7) being embedded axially on the outer circumference of the iron core, a left collector ring (4) being connected to the left end of the guide bar, and a right collector ring (8) being connected to the right end of the guide bar, wherein: The right confluence ring comprises a ring body (17), a plurality of teeth (16) extending radially and symmetrically on the outer circle of the ring body, the number of the teeth being equal to the number of the guide bars, the right end of the guide bar being connected to the side surface of the tooth, the height of the tooth being greater than the height of the guide bar, the guide bar being located above the tooth, and the outer edge of the guide bar being flush with the top of the tooth (16).

2. A rotor according to claim 1, characterized in that: The height of the teeth (16) is three times that of the guide strip (7).

3. A rotor according to claim 1 or 2, characterized in that: The width of the teeth (16) is twice the width of the guide strip (7).

4. A brake motor comprising a rotor as claimed in any one of claims 1 to 3, wherein the rotor is inserted into a stator (5), the stator is fixed to the inner wall of a housing (3), a left end cover (2) and a right end cover (12) are connected to the two ends of the housing respectively, and the left and right ends of the rotating shaft (1) of the rotor are supported in the left end cover and the right end cover respectively through bearings (14), wherein: A disc-shaped armature (9) is fitted on the spline shaft (15) on the right side of the rotating shaft. The outer diameter of the left end of the armature is equal to the outer diameter of the rotor, and the inner diameter of the recess of the armature is equal to the inner diameter of the right confluence ring. A spring (13) is sleeved on the rotating shaft. The spring is located between the right end surface of the rotor and the recessed bottom of the armature. The right end of the armature has a frustum (10). The inner end surface of the right end cover (12) extends to the left with a friction ring (11). The left end of the friction ring has an inner cone (11) that matches the frustum (10).

5. The brake motor according to claim 4, characterized in that: The gap between the armature and the rotor right slip ring is 2 mm.

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