CN104868797A - Novel electrical excitation brake - Google Patents

Abstract

New electric excitation brake. The invention relates to a novel electric excitation brake. Since the brake mostly uses the principle of contact friction to generate torque, the use of friction discs will inevitably reduce the service life of the brake, resulting in brake failure and affecting the safety of surrounding equipment. The motor output shaft (4) is provided with a rotor (3) coaxial with it, the rotor (3) is arranged inside the two stators (2), and the rotor (3) and the two stators (2) Coaxial arrangement, 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 the same as that of the The motor output shaft (4) is perpendicular to the axial direction, and the two stators (2) and the annular excitation coil (1) are both arranged in the motor casing (5), and the motor casing (5) One side of the cover shell (6) is disassembled and connected. The invention is used for electric excitation brake.

Description

New Electric Excitation Brake

technical field

The invention relates to a novel electric excitation brake.

Background technique

In human's industrial production and daily life, servo motor has become a widely used electromechanical energy conversion device. In some special applications, when the servo motor is powered off, it is necessary to use an appropriate braking device to reduce the stop time of the servo motor, so that brake products with various structures emerge as the times require; today's commonly used brakes are mostly They are permanent magnet excitation, electric excitation and hybrid excitation structures. Most of their working principles use mechanical springs to compress the armature, and generate braking torque through the action of the armature and friction discs. For permanent magnet excitation brakes, due to the use of permanent magnets The cost of the system is greatly increased, and the demagnetization of the permanent magnet material reduces the reliability of the system. Since the current brakes use the principle of contact friction to generate torque, the use of friction discs will inevitably reduce the service life of the brake. Cause braking failure and affect the safety of surrounding equipment.

Contents of the invention

The purpose of the present invention is to provide a new electric excitation brake which solves the problem that the service life and reliability of the brake are reduced due to the fact that most of the existing brakes generate braking torque based on the contact friction principle.

Above-mentioned purpose realizes by following technical scheme:

A new type of electric excitation brake, which consists of: an annular excitation coil 1, two stators 2, a rotor 3, and a motor output shaft 4, the motor output shaft 4 is provided with a rotor 3 coaxial with it, and the The rotor 3 is arranged inside the two stators 2, and the rotor 3 is coaxially arranged with the two stators 2, and the annular excitation coil 1 wound on the annular coil frame is arranged between the two stators 2, and the said 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 One side of the shell 5 is detachably connected with the rear cover shell 6 .

In the new type electric excitation brake, the inner circumferential surface of the stator 2 and the outer circumferential surface of the rotor 3 are respectively evenly distributed with tooth slots, and the width of each tooth slot of the stator 2 is equal. The width of each tooth slot of the rotor 3 is also equal.

Beneficial effect:

1. The control mode of the brake of the present invention is simple, and the braking torque can be generated by feeding direct current into the winding, without using redundant electronic devices and complicated circuit topology.

2. The braking principle of the present invention adopts the non-contact method of the stator and the rotor, and does not use components such as compression springs, armatures, and friction discs, which greatly improves the reliability and service life of the system.

3. When the brake of the present invention is coaxially connected with the pump device, it can prevent the pump device from being withdrawn and reversed after power failure, and play a role in positioning.

4. The structure and operation mode of the brake of the present invention are simple, and complicated maintenance costs are avoided.

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 the magnetic circuit model diagram of accompanying drawing 1.

Detailed ways:

Example 1

In conjunction with accompanying drawings 1 and 3, a new type of electric excitation brake is composed of: an annular excitation coil 1, two stators 2, a rotor 3, and a motor output shaft 4. The motor output shaft 4 is provided with the same The rotor 3 of the shaft, the rotor 3 is arranged inside the two stators 2, and the rotor 3 and the two stators 2 are coaxially arranged, and the two stators 2 are provided with a ring wound on the ring coil frame Excitation coil 1, and the winding direction of the annular excitation coil 1 is perpendicular to the axial direction of the motor output shaft 4, and the two stators 2 and the annular excitation coil 1 are arranged on the motor casing 5, one side of the motor housing 5 is detached from the rear cover shell 6.

Example 2

In conjunction with accompanying drawing 2, in the new type electric excitation brake described in embodiment 1, tooth slots are evenly distributed on the inner peripheral surface of the stator 2 and the outer peripheral surface of the rotor 3 respectively, and the stator 2 The width of each tooth slot is equal, and the width of each tooth slot of the rotor 3 is also equal.

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 rotor must be the same. In this paper, the number of slots in the brake design is 16, and the number of slots in the circumferential direction of the stator and rotor can also be changed according to the design requirements. The energization method of the toroidal excitation coil is direct current. The stator, the rotor and the ring winding coil of the brake are coaxially arranged. The principle of generating the braking torque in the present invention adopts the non-contact mode of the stator and the rotor, and does not use compression springs, armatures and friction disc components, which greatly improves the reliability and service life of the system. The invention is applicable to various servo motor systems.

The magnetic circuit model of the new electric excitation brake is shown in Figure 4. When the brake winding is supplied with direct current, a magnetomotive force F _m is generated in the stator, and the magnetic field line first passes through the stator yoke, stator teeth, working air gap, and rotor on one side of the brake. The teeth and the rotor yoke form a closed loop passing through the stator and rotor teeth and yoke on the other side. 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 other numbers of teeth can also be designed 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 the rotor, the change rate of the air gap permeability is not uniform, and the reluctance torque can be generated under the action of the magnetomotive force of the winding, that is, the braking torque of the brake.

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 (3)

1. A new type of electric excitation brake, which consists of: annular excitation coil (1), two stators (2), rotor (3), motor output shaft (4), characterized in that: the motor output shaft (4) is provided with a rotor (3) coaxial with it, the rotor (3) is arranged inside the two stators (2), and the rotor (3) is arranged coaxially with the two stators (2), the A ring-shaped excitation coil (1) wound on a ring-shaped coil frame is arranged between the two stators (2), and the winding direction of the ring-shaped excitation coil (1) is in line with the motor output shaft (4) The axial direction is perpendicular to each other, the two stators (2) and the annular excitation coil (1) are both arranged in the motor casing (5), and one side of the motor casing (5) is connected to the rear cover Shell (6) disassembles the connection. 2. The new type electric excitation brake according to claim 1, characterized in that: the inner circumferential surface of the stator (2) and the outer circumferential surface of the rotor (3) are respectively evenly distributed with tooth grooves, so The widths of the tooth slots of the stator (2) are equal, and the widths of the tooth slots of the rotor (3) are also equal. 3. The novel electric excitation brake according to claim 1, characterized in that: each of the stators (2) corresponds to each of the rotors (3).