CN104868693A - Hybrid excitation type brake with velocity measurement function - Google Patents

Abstract

Hybrid excitation brake with speed measurement function. The invention relates to a hybrid excitation brake with speed measuring function. The use of friction discs will inevitably reduce the service life of the brake, thereby causing brake failure and affecting the use safety of surrounding equipment. The output shaft of the motor is provided with a rotor coaxial with it, the outer surface of the rotor is connected with two pieces of permanent magnetic steel, the rotor is arranged inside the two stators, and the rotor and the two stators are arranged coaxially, The two stators correspond to the two pieces of permanent magnetic steel one by one, and the annular excitation coil wound on the annular coil frame is arranged between the two stators, and the winding direction of the annular excitation coil is the same as that of the The axial direction of the motor output shaft is perpendicular to each other, the two stators and the annular excitation coil are all arranged in the motor casing, and a working air gap is opened in the radial direction on the described motor casing, and the described motor One side of the casing is disassembled and connected with the rear cover shell. The invention is used for a hybrid excitation brake.

Description

Hybrid Excited Brake with Tachometry

technical field

The invention relates to a hybrid excitation brake with speed measuring function.

Background technique

In today's industrial automation systems, brakes have been used in every corner of the industry, such as attitude maintenance of aerospace robotic arms, automobile tire brakes, elevator brakes, etc.; most of the commonly used brakes today are electric excitation structures, and their working principles are mostly used The mechanical spring compresses the armature, and the braking torque is generated through the action of the armature and the friction disc. The use of friction discs will inevitably reduce the service life of the brake, thereby causing brake failure and affecting the use safety of surrounding equipment. At the same time, for a brake with an electric excitation structure, in order to obtain a larger braking torque, the electric load of the electromagnetic brake must be increased, thereby increasing the copper consumption of the brake and resulting in a waste of energy. In addition, the existing brake does not have a speed measurement function in a non-braking state, and cannot measure the speed of the motor.

Contents of the invention

The object of the present invention is to provide a hybrid excitation brake with a speed measuring function which can not only improve the braking torque of the existing electromagnetic brake, but also can measure the speed of the coaxial motor in the non-braking state.

Above-mentioned purpose realizes by following technical scheme:

A hybrid excitation brake with speed measuring function, which consists of: permanent magnet steel 7, annular excitation coil 1, two stators 2, rotor 3, motor output shaft 4, the motor output shaft 4 is provided with The rotor 3 coaxial with it, the outer surface of the rotor 3 is connected with two pieces of permanent magnetic steel 7, the rotor 3 is arranged inside the two stators 2, and the rotor 3 is arranged coaxially with the two stators 2, the two The stator 2 is in one-to-one correspondence with two pieces of permanent magnetic steel 7, and the annular excitation coil 1 wound on the annular coil frame is arranged between the two stators 2, and the winding direction of the annular excitation coil 1 is Perpendicular to the axial direction of the motor output shaft 4, the two stators 2 and the annular field coil 1 are all arranged in the motor casing 5, and the motor casing 5 is radially opened with Working air gap 8, one side of the motor casing 5 is detachably connected with the rear cover shell 6.

In the hybrid excitation brake with a speed measuring function, a plurality of tooth slots are evenly distributed on the inner peripheral surface of the stator 2 and the outer peripheral surface of the rotor 3, and each slot on the inner peripheral surface of the stator 2 The part between two adjacent tooth slots is a stator tooth, the part between every two adjacent tooth slots on the outer peripheral surface of the rotor 3 is a rotor tooth, and the width of each tooth slot of the stator 2 is equal, The width of each slot of the rotor 3 is also equal, and the slots on the inner peripheral surface of the stator 2 correspond to the slots on the outer peripheral surface of the rotor 3 one by one.

In the hybrid excitation brake with speed measuring function, the two permanent magnets 7 are arranged on a pair of teeth on the same axis of the rotor 3 .

In the hybrid excitation brake with speed measuring function, each piece of permanent magnet steel 7 is set on multiple tooth slots of the rotor 3 or on multiple rotor teeth of the rotor 3 .

In the hybrid excitation brake with speed measuring function, the permanent magnetic steel 7 is arranged laterally on the top of the rotor teeth.

In the hybrid excitation brake with speed measuring function, the permanent magnetic steel 7 is vertically arranged on the rotor teeth.

In the hybrid excitation brake with speed measuring function, the permanent magnetic steel 7 is arranged laterally on the top of the dedendum between the two stator teeth.

In the hybrid excitation brake with speed measuring function, the permanent magnetic steel 7 is arranged on the dedendum between two rotor teeth.

Beneficial effect:

1. The rotor of the brake of the present invention is provided with a pair of permanent magnets, and the permanent magnet excitation is added on the basis of the electric excitation. The introduction of permanent magnets can increase the output torque of the brake.

2. When the winding of the brake of the present invention is not energized, since the brake is connected with the motor main shaft, when the motor rotates, a single-phase induced potential can be generated in the winding of the brake, thereby the rotating speed of the motor can be measured.

3. The motor of the present invention has simple structure, convenient control and high reliability.

Description of drawings:

Accompanying drawing 1 is a structural representation of the present invention.

Accompanying drawing 2 is the right view of accompanying drawing 1.

Accompanying drawing 3 is the left view of accompanying drawing 1.

Accompanying drawing 4 is a schematic diagram of the placement of permanent magnetic steel laterally arranged on the rotor teeth.

Accompanying drawing 5 is a schematic diagram of placement of permanent magnetic steel vertically arranged on rotor teeth.

Accompanying drawing 6 is a schematic diagram of the placement of permanent magnetic steel placed laterally between two stators.

Accompanying drawing 7 is the placement schematic diagram of permanent magnet steel being arranged between two rotors.

Detailed ways:

Example 1

In conjunction with accompanying drawings 1 and 3, a hybrid excitation brake with speed measuring function is composed of: permanent magnet steel 7, annular excitation coil 1, two stators 2, rotor 3, motor output shaft 4, the The motor output shaft 4 is provided with a rotor 3 coaxial with it, the outer surface of the rotor 3 is connected with two pieces of permanent magnetic steel 7, the rotor 3 is arranged inside the two stators 2, and the rotor 3 and the two The stator 2 is coaxially arranged, and the two stators 2 correspond to the two permanent magnets 7 one by one. The annular excitation coil 1 wound on the annular coil frame is arranged between the two stators 2, and the described The winding direction of the ring-shaped excitation coil 1 is perpendicular to the axial direction of the motor output shaft 4, and the two stators 2 and the ring-shaped excitation coil 1 are all arranged in the motor casing 5. The motor casing A working air gap 8 is formed radially on the casing 5 , and one side of the motor casing 5 is detachably connected to the rear cover casing 6 .

Example 2

In conjunction with accompanying drawing 2, in the hybrid excitation brake with speed measuring function described in embodiment 1, a plurality of cogs are evenly distributed on the inner peripheral surface of the stator 2 and the outer peripheral surface of the rotor 3 respectively, The part between every two adjacent tooth slots on the inner peripheral surface of the stator 2 is a stator tooth, and the part between every two adjacent tooth slots on the outer peripheral surface of the rotor 3 is a rotor tooth. The stator The width of each tooth groove of 2 is equal, and the width of each tooth groove of the rotor 3 is also equal, and the multiple tooth grooves on the inner peripheral surface of the stator 2 and the multiple tooth grooves on the outer peripheral surface of the rotor 3 corresponding settings.

Example 3

In conjunction with accompanying drawing 2, for the hybrid excitation brake with speed measuring function described in Embodiment 1, the two permanent magnets 7 are arranged on a pair of teeth on the same axis of the rotor 3 .

Example 4

In conjunction with accompanying drawing 2, for the hybrid excitation brake with speed measurement function described in embodiment 1, each piece of permanent magnet steel 7 is arranged on a plurality of tooth slots of the rotor 3, or is arranged on the rotor 3 on multiple rotor teeth.

Example 5

Referring to Figure 4, the hybrid excitation brake with speed measurement function described in Embodiment 1, the permanent magnetic steel 7 is arranged laterally at the tooth tips of the rotor teeth.

Example 6

Referring to Figure 5, the hybrid excitation brake with speed measurement function described in Embodiment 1, the permanent magnetic steel 7 is vertically arranged on the rotor teeth.

Example 7

In conjunction with accompanying drawing 6, the hybrid excitation brake with speed measuring function described in embodiment 1, the permanent magnetic steel 7 is arranged laterally on the top of the dedendum between the two stator teeth.

Example 8

Referring to Figure 7, the hybrid excitation brake with speed measurement function described in Embodiment 1, the permanent magnetic steel 7 is arranged on the dedendum between the two rotor teeth.

Along the axial direction of the brake, the annular hollow structure in the axial middle section of the stator and rotor is provided with an annular winding coil, and the winding direction of the coil is perpendicular to the axial direction. The number of slots in the stator and the rotor must be the same. The number of slots designed for the brake of the present invention is 16, and the number of slots in the circumferential direction of the stator and rotor can also be changed according to actual design requirements. The energization method of the toroidal excitation coil is direct current. The stator, rotor, permanent magnetic steel and ring winding coil of the brake are coaxially arranged. The principle of generating the braking torque of the present invention adopts the hybrid excitation type, which can greatly increase the output of the brake, and at the same time adds a new function that other brakes do not have, that is, the coaxial motor speed measurement function can be performed in the non-braking state.

When the brake winding is fed with direct current, the magnetomotive force generated in the stator interacts with the permanent magnetomotive force, and the magnetic field line first passes through the stator yoke, stator teeth, working air gap, rotor teeth and rotor yoke on one side of the brake, and then passes through the other side. The stator and rotor teeth, yoke and other parts on the side form a closed loop. In the present invention, the number of teeth of the stator and rotor of the brake is equal to 16 as an example, and the tooth width and slot width are kept the same, and it can also be designed as other number of teeth to meet the requirements of torque range in different occasions.

The working principle of the present invention: due to the existence of the cogging effect of the stator and rotor, the rate of change of the air gap permeability is not uniform, and the braking torque can be generated under the action of the winding magnetomotive force and the permanent magnet magnetomotive force, that is, the braking torque of the brake braking torque. When the brake is powered off, since its rotor is coaxially connected with the motor, the waveform of the induced potential can be measured at the ring winding end of the brake at this time, so as to know the motor speed.

Of course, the above descriptions are not intended to limit the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or replacements made by those skilled in the art within the scope of the present invention shall also belong to the present invention. protection scope of the invention.

Claims (8)

1. the composite excitation formula brake with speed measuring function, its composition comprises: permanent magnetic steel (7), ring-shape field coil (1), two stators (2), rotor (3), motor output shaft (4), it is characterized in that: described motor output shaft (4) is provided with the rotor (3) coaxial with it, described rotor (3) lateral surface connects two pieces of permanent magnetic steels (7), it is inner that described rotor (3) is arranged on two stators (2), and rotor (3) and two stators (2) are coaxially arranged, two stators (2) and two pieces of permanent magnetic steel (7) one_to_one corresponding, the ring-shape field coil (1) be wound in toroid coil is provided with between two described stators (2), and the coiling direction of described ring-shape field coil (1) and described motor output shaft (4) are axially perpendicular, two described stators (2) and described ring-shape field coil (1) are all arranged in motor casing (5), described motor casing (5) radially has working gas gap (8), side and the rear lid case (6) of described motor casing (5) removably connect.

2. the composite excitation formula brake with speed measuring function according to claim 1, it is characterized in that: be uniformly distributed respectively on the inner peripheral surface of described stator (2) and on the outer circumference surface of rotor (3) and be provided with multiple teeth groove, part between often adjacent two teeth groove on the inner peripheral surface of stator (2) is stator tooth, part between often adjacent two teeth groove on the outer circumference surface of rotor (3) is rotor tooth, the width of each teeth groove of described stator (2) is equal, the width of each teeth groove of described rotor (3) is also equal, multiple teeth groove one_to_one corresponding on the outer circumference surface of the multiple teeth groove on the inner peripheral surface of stator (2) and rotor (3) are arranged.

3. the composite excitation formula brake with speed measuring function according to claim 2, is characterized in that: the permanent magnetic steel (7) described in two pieces is arranged on a pair tooth of the same axis of described rotor (3).

4. according to the composite excitation formula brake with speed measuring function according to claim 2, it is characterized in that: every permanent magnetic steel (7) described in block is arranged on multiple teeth groove of described rotor (3), or is arranged on multiple rotor tooths of rotor (3).

5. the composite excitation formula brake with speed measuring function according to claim 2, is characterized in that: described permanent magnetic steel (7) is horizontally installed on the tooth tip of rotor tooth.

6. the composite excitation formula brake with speed measuring function according to claim 2, is characterized in that: described permanent magnetic steel (7) is vertically arranged on rotor tooth.

7. the composite excitation formula brake with speed measuring function according to claim 2, is characterized in that: described permanent magnetic steel (7) is horizontally installed on the tooth root top between two stator tooths.

8. the composite excitation formula brake with speed measuring function according to claim 2, is characterized in that: described permanent magnetic steel (7) is arranged on the tooth root between two rotor tooths.