CN209844801U

CN209844801U - Double-stator magnetic field permanent magnet direct current coreless motor

Info

Publication number: CN209844801U
Application number: CN201921086894.5U
Authority: CN
Inventors: 侯荣生
Original assignee: Shenzhen Xin Baoda Motor Co Ltd
Current assignee: Shenzhen Xin Baoda Motor Co Ltd
Priority date: 2019-07-12
Filing date: 2019-07-12
Publication date: 2019-12-24
Anticipated expiration: 2029-07-12

Abstract

The utility model provides a two stator magnetic field permanent magnetism direct current coreless motor, the utility model relates to a coreless motor technical field, the pivot utilizes bearing and protecgulum and back lid to connect soon fixedly, both ends around the casing are fixed respectively to protecgulum and back lid, and the inner pot head of protecgulum is established in the pivot that is located the casing, the outside cover that this cover established the end is equipped with inner yoke, inner yoke's outside cover is equipped with interior Halbach magnet, the outside cover of interior Halbach magnet is equipped with outer Halbach magnet, the outer wall of this outer Halbach magnet is fixed on the inner wall of casing, and the space internalization between interior Halbach magnet and the outer Halbach magnet is inserted and is equipped with the armature cup, the rear end of this armature cup is fixed on the commutator, the commutator cover is established and is fixed in the pivot, the medial surface of back lid is fixed with the. The stator yoke can generate higher magnetic flux density in an air gap when being made of common materials, and has good magnetic shielding effect; the thickness of the magnetic yoke can be reduced, thereby improving the utilization rate of the magnet and the magnetic material.

Description

Double-stator magnetic field permanent magnet direct current coreless motor

Technical Field

The utility model relates to a coreless motor technical field, concretely relates to two stator magnetic field permanent magnetism direct current coreless motor.

Background

The permanent magnet direct current coreless motor has the characteristics of outstanding energy conservation, sensitivity, convenient control and stable operation. Since coreless iron is used as a high efficiency energy conversion device, it represents a development direction of electric machines in many applications. However, the coreless motor has no iron core, and the air gap is much larger than that of the iron core motor. On the premise of weight and volume limitation, the large air gap of the motor can lead to the difficult improvement of the torque coefficient, the magnetic leakage and other problems. The control motor is special in use, performance and environmental conditions. As the demands of the market on the torque, the efficiency and the power density of the motor are continuously increased, the existing coreless motor is difficult to meet the increasing demands of the market.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a double-stator magnetic field permanent magnet DC coreless motor with reasonable design aiming at the defects and shortcomings of the prior art, which can generate higher magnetic flux density in the air gap when the stator yoke is made of common materials and has good magnetic shielding function; the thickness of the magnetic yoke can be reduced, thereby improving the utilization rate of the magnet and the magnetic material.

In order to achieve the above purpose, the utility model adopts the following technical proposal: the magnetic brushless DC motor comprises a rotating shaft, a commutator, a shell, an armature cup, a front cover, an inner yoke, an electric brush, an inner Halbach magnet, an outer Halbach magnet and a rear cover; the rotating shaft is screwed and fixed with the front cover and the rear cover by using a bearing, the front cover and the rear cover are respectively fixed at the front end and the rear end of the casing, the inner end of the front cover is sleeved on the rotating shaft positioned in the casing, the outer part of the sleeved end is sleeved with an inner yoke, the outer part of the inner yoke is sleeved with an inner Halbach magnet, the outer part of the inner Halbach magnet is sleeved with an outer Halbach magnet, the outer wall of the outer Halbach magnet is fixed on the inner wall of the casing, an armature cup is movably inserted in a gap between the inner Halbach magnet and the outer Halbach magnet, the rear end of the armature cup is fixed on the commutator, the commutator is sleeved and fixed on the rotating shaft, and the inner side surface of the rear; the armature cup is made of 23 elements, each element is 3 turns, and each turn is made of 7 strands of conducting wires which are wound in a parallel mode and have the diameter of 0.4 mm.

Furthermore, the inner Halbach magnet and the outer Halbach magnet are sintered neodymium iron boron magnets, and the air gap flux density reaches 1.2T.

Furthermore, the armature cup and the commutator are electrically connected by a wave winding structure.

After the structure is adopted, the beneficial effects of the utility model are that: the utility model provides a double-stator magnetic field permanent magnet DC coreless motor, which can generate higher magnetic flux density in an air gap when a stator yoke is made of common materials, and has good magnetic shielding effect; the thickness of the magnetic yoke can be reduced, thereby improving the utilization rate of the magnet and the magnetic material.

Description of the drawings:

fig. 1 is an axial sectional view of the present invention.

Fig. 2 is a radial cross-sectional view of the present invention.

Description of reference numerals:

the magnetic brushless DC motor comprises a rotating shaft 1, a commutator 2, a machine shell 3, an armature cup 4, a front cover 5, an inner yoke 6, an electric brush 7, an inner Halbach magnet 8, an outer Halbach magnet 9 and a rear cover 10.

The specific implementation mode is as follows:

the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1 and fig. 2, the following technical solutions are adopted in the present embodiment: the magnetic brushless DC motor comprises a rotating shaft 1, a commutator 2, a machine shell 3, an armature cup 4, a front cover 5, an inner yoke 6, an electric brush 7, an inner Halbach magnet 8, an outer Halbach magnet 9 and a rear cover 10; the rotating shaft 1 is screwed and fixed with a front cover 5 and a rear cover 10 by using bearings, the front cover 5 and the rear cover 10 are respectively connected and fixed at the front end and the rear end of the casing 3 by using bolts, the outer diameter of the casing 3 is 60mm, the inner end of the front cover 5 is sleeved on the rotating shaft 1 positioned in the casing 3, an inner yoke 6 is sleeved and fixed outside the sleeved end, an inner Halbach magnet 8 is sleeved outside the inner yoke 6, an outer Halbach magnet 9 is sleeved outside the inner Halbach magnet 8, the outer wall of the outer Halbach magnet 9 is fixed on the inner wall of the casing 3, the inner Halbach magnet 8 and the outer Halbach magnet 9 are sintered neodymium iron boron magnets, the air gap magnetic density reaches 1.2T, and the thicknesses of the inner Halbach magnet 8 and the outer Halbach magnet 9 are both 5.92 mm; an armature cup 4 is movably inserted in a gap between the inner Halbach magnet 8 and the outer Halbach magnet 9, the rear end of the armature cup 4 is fixed on the commutator 2, the armature cup 4 and the commutator 2 are electrically connected by a wave winding structure (so as to eliminate the internal circulation of the motor when the windings are asymmetric), the commutator 2 is sleeved and fixed on the rotating shaft 1, and the inner side surface of the rear cover 10 is fixed with an electric brush 7; the armature cup 4 adopts 23 elements, each element is 3 turns, and each turn is made of 7 strands of parallel wound wires with the diameter of 0.4 mm.

The working principle of the specific embodiment is as follows: the inner Halbach magnet 8 generates a gas gap excitation magnetic field, and when the rotor rotates, the conductor cuts magnetic lines of force; the outer Halbach magnet 9 generates an air gap excitation magnetic field, and when the armature cup 4 rotates, the conductor cuts magnetic lines; the internal magnetic field and the external magnetic field are mutually superposed to generate a magnetism gathering effect; when the thicknesses of the inner Halbach magnet 8 and the outer Halbach magnet 9 reach a certain value, the magnetic density is increased little, the air gap magnetic flux is about 1.6 times larger than that of a permanent magnet direct current hollow cup motor with a general structure, the number of turns (number of conductors) of a coil of the armature cup 4 is greatly reduced on the premise of ensuring the same no-load rotating speed, a space is provided for increasing the sectional area of the conductor and reducing the resistance of the conductor (the smaller the armature resistance of the permanent magnet direct current motor is, the harder the motor is, and the stronger the load carrying capacity is), the armature cup 4 adopts 23 elements, each element is 3 turns, and each turn is made of 7 parallel-wound wires with the diameter of 0.4 mm; because the double Halbach magnets are used, the magnetic flux of the motor is greatly improved, and the torque of the motor is greatly increased; because the magnetic flux promotes by a wide margin (compared with the conventional structure), the number of turns of the armature cup coil is greatly reduced, and the number of turns of the armature cup coil is more than enough, the sectional area of a lead can be greatly increased, the resistance is effectively reduced, the hard characteristic of the motor is greatly increased, the purposes of large torque, high power density and high efficiency are finally achieved, and the market requirement is met.

After adopting above-mentioned structure, this embodiment's beneficial effect is: the specific embodiment provides a double-stator magnetic field permanent magnet direct current coreless motor, which can enable a stator yoke to generate higher magnetic flux density in an air gap when a common material is used, and has a good magnetic shielding effect; the thickness of the magnetic yoke can be reduced, thereby improving the utilization rate of the magnet and the magnetic material.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a two stator magnetic field permanent magnetism direct current coreless motor which characterized in that: the magnetic brushless DC motor comprises a rotating shaft (1), a commutator (2), a shell (3), an armature cup (4), a front cover (5), an inner yoke (6), an electric brush (7), an inner Halbach magnet (8), an outer Halbach magnet (9) and a rear cover (10); the rotating shaft (1) is fixedly connected with a front cover (5) and a rear cover (10) through bearings in a rotating mode, the front cover (5) and the rear cover (10) are fixed to the front end and the rear end of a casing (3) respectively, the inner end of the front cover (5) is sleeved on the rotating shaft (1) located in the casing (3), an inner yoke (6) is sleeved on the outer portion of the sleeved end, an inner Halbach magnet (8) is sleeved on the outer portion of the inner yoke (6), an outer Halbach magnet (9) is sleeved on the outer portion of the inner Halbach magnet (8), an armature cup (4) is movably inserted in a gap between the inner Halbach magnet (8) and the outer Halbach magnet (9), the rear end of the armature cup (4) is fixed to a commutator (2), the commutator (2) is sleeved on the rotating shaft (1), and an electric brush (7) is fixed to the inner side face of the rear cover (10); the armature cup (4) adopts 23 elements, each element is 3 turns, and each turn is made of 7 parallel-wound wires with the diameter of 0.4 mm.

2. A dual stator field permanent magnet dc coreless motor according to claim 1, wherein: the inner Halbach magnet (8) and the outer Halbach magnet (9) are sintered neodymium iron boron magnets, and the air gap flux density reaches 1.2T.

3. A dual stator field permanent magnet dc coreless motor according to claim 1, wherein: the armature cup (4) is electrically connected with the commutator (2) by a wave winding structure.