阅读说明：本技术 一种直流电机电枢结构 (Armature structure of direct current motor ) 是由 吴凌轩 张鹏 于 2019-11-29 设计创作，主要内容包括：本发明公开了一种直流电机电枢结构,通过电枢支架进行支撑,其定子铁心两端由电枢支架压紧固定,定子铁心的表面开槽中嵌有蛙绕组线圈,蛙绕组线圈的非换向器端线圈通过并头片焊接固定,换向器端线圈的接头与升高片通过焊接固定；蛙绕组线圈的非换向器端线圈和换向器端线圈通过无纬带固定,通过绑扎形成中间留有通风风道的间隔结构,升高片上单独绑扎一道无纬带以进行固定,升高片处无纬带与所述蛙绕组线圈的端部的无纬带中间留有通风间隙。本发明的一种直流电机电枢结构,采用蛙绕组线圈,省去了电枢上设置的均压线,结构简单,稳定可靠；换向器端端部无纬带采用特殊通风结构,增加风道,加强散热,并能起到吹拂碳粉的作用,避免了击穿等事故的发生。(The invention discloses a DC motor armature structure, which is supported by an armature bracket, wherein two ends of a stator core are pressed and fixed by the armature bracket, a frog winding coil is embedded in a slot on the surface of the stator core, a non-commutator end coil of the frog winding coil is fixed by welding through a head piece, and a joint of the commutator end coil is fixed with a lifting piece by welding; the non-commutator end coil and the commutator end coil of the frog winding coil are fixed through a weftless tape, an interval structure with a ventilation air duct left in the middle is formed through binding, a weftless tape is separately bound on the lifting sheet for fixing, and a ventilation gap is left between the weftless tape at the lifting sheet and the weftless tape at the end part of the frog winding coil. According to the armature structure of the direct current motor, the frog winding coil is adopted, the equalizing line arranged on the armature is omitted, and the structure is simple, stable and reliable; the non-weft tape at the end part of the commutator adopts a special ventilation structure, increases an air duct, enhances heat dissipation, plays a role in blowing carbon powder, and avoids accidents such as breakdown and the like.)

1. The utility model provides a direct current motor armature structure, includes the rotor winding who is connected with stator core, stator core surface fluting sets up the shaping coil that forms rotor winding in the groove, shaping coil one end is connected on the commutator through raising the piece, and the other end passes through and head piece welded connection, constitutes closed circuit, its characterized in that:

the direct current motor armature structure is supported by an armature bracket, the armature bracket is fixed on a shaft of a stator core in an interference manner through a thermal sleeve, the stator core is fixed on the armature bracket through a key, two ends of the stator core are pressed and fixed by the armature bracket, and a frog winding coil is embedded in a slot on the surface of the stator core;

the non-commutator end coils of the frog winding coils are fixedly connected through head combining pieces by means of hard welding, and the joints of the commutator end coils of the frog winding coils are fixedly connected with the lifting pieces by means of hard welding;

the non-commutator end coil and the commutator end coil of the frog winding coil are fixed through a non-weft tape, a section of length is bound during binding, then a distance is kept, the length of one end is bound to form an interval structure with a ventilation air duct in the middle, a non-weft tape is bound on the lifting sheet for fixing, the width of the non-weft tape is the same as that of the lifting sheet, and a ventilation gap is reserved between the non-weft tape at the position of the lifting sheet and the non-weft tape at the end part of the frog winding coil.

2. A dc motor armature structure according to claim 1, wherein the commutator is a dovetail type commutator fixed by tightening a bolt, and the commutator is fitted around a shaft of the stator core.

3. The armature structure of a direct current motor according to claim 2, wherein a cushion block is arranged on the surface of the elevating piece of the commutator, and the cushion block is bound and fixed with the commutator through a polyester glass rope.

4. The armature structure of the direct current motor according to claim 1, wherein ventilation holes are symmetrically formed in end faces of punching sheets at two ends of the stator core, and ventilation paths are reserved between the inner diameter of the punching sheets and the armature support.

Technical Field

The invention relates to a direct current motor armature structure used in the field of motors.

Background

The rotor of a dc motor is the hub for the conversion of electromechanical energy, called the armature. A groove is formed in the surface of a direct current motor iron core, a formed coil is placed in the groove, one end of the coil is connected to a commutator through a lifting piece, and the other end of the coil is connected through a head piece in a welding mode to form a closed loop. When the stator main pole coil is electrified to establish a magnetic field, current is induced in the armature coil, and electromagnetic torque is generated. The existing direct current motor armature has a complex structure, the armature needs to be provided with a voltage-equalizing coil to install a winding, and the poor ventilation performance easily causes the overheating of the armature in the use process, thereby affecting the performance and the service life of the product.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a direct current motor armature structure which is compact in structure, convenient to install, reliable in use and good in ventilation performance.

One technical scheme for achieving the above purpose is as follows: a DC motor armature structure comprises a rotor winding connected with a stator core, wherein the surface of the stator core is provided with a groove, a formed coil for forming the rotor winding is arranged in the groove, one end of the formed coil is connected to a commutator through a lifting sheet, and the other end of the formed coil is welded and connected through a head-combining sheet to form a closed loop;

the direct current motor armature structure is supported by an armature bracket, the armature bracket is fixed on a shaft of a stator core in an interference manner through a thermal sleeve, the stator core is fixed on the armature bracket through a key, two ends of the stator core are pressed and fixed by the armature bracket, and a frog winding coil is embedded in a slot on the surface of the stator core;

the non-commutator end coils of the frog winding coils are fixedly connected through head combining pieces by means of hard welding, and the joints of the commutator end coils of the frog winding coils are fixedly connected with the lifting pieces by means of hard welding;

the non-commutator end coil and the commutator end coil of the frog winding coil are fixed through a non-weft tape, a section of length is bound during binding, then a distance is kept, the length of one end is bound to form an interval structure with a ventilation air duct in the middle, a non-weft tape is bound on the lifting sheet for fixing, the width of the non-weft tape is the same as that of the lifting sheet, and a ventilation gap is reserved between the non-weft tape at the position of the lifting sheet and the non-weft tape at the end part of the frog winding coil.

Furthermore, the commutator is a dovetail commutator and is tightened and fixed by bolts, and the commutator is sleeved on a shaft of the stator core in a hot manner.

And furthermore, a cushion block is arranged on the surface of the lifting sheet of the commutator, and the cushion block is bound and fixed with the commutator through a polyester glass rope.

Furthermore, ventilation holes are symmetrically formed in the end faces of the punching sheets at the two ends of the stator core, and ventilation diameters are reserved between the inner diameters of the punching sheets and the armature support.

The invention relates to a direct current motor armature structure which is supported by an armature bracket, wherein two ends of a stator core of the direct current motor armature structure are pressed and fixed by the armature bracket, a frog winding coil is embedded in a groove on the surface of the stator core, a non-commutator end coil of the frog winding coil is fixed by welding through a head piece, and a joint of the commutator end coil is fixed with a lifting piece by welding; the non-commutator end coil and the commutator end coil of the frog winding coil are fixed through a weftless tape, an interval structure with a ventilation air duct left in the middle is formed through binding, a weftless tape is separately bound on the lifting sheet for fixing, and a ventilation gap is left between the weftless tape at the lifting sheet and the weftless tape at the end part of the frog winding coil. According to the armature structure of the direct current motor, the frog winding coil is adopted, the equalizing line arranged on the armature is omitted, and the structure is simple, stable and reliable; the non-weft tape at the end part of the commutator adopts a special ventilation structure, increases an air duct, enhances heat dissipation, plays a role in blowing carbon powder, and avoids accidents such as breakdown and the like.

Drawings

Fig. 1 is a schematic structural diagram of an armature structure of a dc motor according to the present invention.

Detailed Description

In order to better understand the technical solution of the present invention, the following detailed description is made by specific examples:

referring to fig. 1, an armature structure of a dc motor according to the present invention includes a rotor winding connected to a stator core 1, and the rotor winding is a frog winding coil 2.

The armature structure of the direct current motor is supported by an armature bracket, and the armature bracket is fixed on a shaft 3 of the stator core through a thermal sleeve in an interference manner. The stator core 1 is fixed on the armature bracket 4 through a key, and two ends of the stator core 1 are pressed and fixed by the armature bracket 4. The shaft 3 is made of No. 45 steel or 35CrMo alloy steel, and a key groove or interference connection mode can be selected at the shaft extension end, so that the requirements of different loads are met. The stator iron core 1 is formed by laminating silicon steel sheets, and has strong dynamic performance and small iron loss. The frog winding coil 2 is embedded in the surface groove of the stator iron core 1, and due to the characteristics of the frog winding coil, the armature does not need to be provided with a voltage-equalizing coil, so that the reliability and the installation convenience of the armature are improved.

The non-commutator end coils of the frog winding coils 2 are fixedly connected through the head combining pieces by brazing, and the joints of the commutator end coils of the frog winding coils 2 are fixedly connected with the lifting pieces 51 by brazing. The commutator 5 is a dovetail commutator and is tightened and fixed by bolts, and the commutator 5 is sleeved on the shaft 3 of the stator core. Because the rising piece 51 is long and thin, resonance can be generated during operation to cause fracture, a cushion block is additionally arranged on the surface of the rising piece of the commutator, and the cushion block is bound and fixed with the commutator through a polyester glass rope, so that the fracture resistance of the rising piece is improved.

Because the armature rotation speed is very high when the motor normally operates, the armature coil and the lifting piece can generate very large centrifugal force, the armature coil is divided into a non-commutator end coil, a commutator end coil and a coil in the iron core slot according to positions, and because the bending rigidity of the coil is very small, different fixing measures are required to be adopted for the coil, so that the rotor coil is fixed reliably. The non-commutator end coil and the commutator end coil of the frog winding coil 2 are fixed through a weftless tape 6, bound for a certain length during binding, then separated for a certain distance, and bound for a certain length to form a spacing structure 61 with a ventilation air duct left in the middle, and the structure can enhance the heat dissipation of the end coil. The middle section of the coil is bound and fixed by a weftless tape 6, bound by a special tool, dried, cured and fixed, and the binding tension is calculated by a special formula according to different operation conditions of the motor. And a piece of weftless tape 6 is bound on the lifting piece 51 for fixation, the width of the weftless tape is the same as that of the lifting piece, and the tension of the weftless tape is controlled independently, so that the lifting piece cannot fly out due to overlarge centrifugal force, and the bending deformation of the lifting piece due to overlarge binding tension can be avoided. A ventilation gap 62 is left between the weftless tape 6 at the rising piece 51 and the weftless tape 6 at the end of the frog winding coil 2. Preferably, the width of the ventilation gap 62 is set to 10 mm. When the armature rotates, wind can blow the part to blow away dust, so that the grounding accident caused by accumulated carbon powder is prevented.

The end faces of the punching sheets at the two ends of the stator core 4 are symmetrically provided with vent holes, and the inner diameter of the punching sheet and the armature bracket are provided with vent paths. The surface of the armature has a clearance with the surfaces of the stator main pole and the reversing pole, the clearance between the main pole and the reversing pole is large, the binding position of the non-weft tape at the end part of the coil is provided with the clearance, the ventilation condition of the armature is good, the heat dissipation capability is high, and the motor has large overload running performance.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.