CN104753291A - Radio and axial hybrid magnetic circuit permanent-magnet synchronous-side rotor motor - Google Patents

Abstract

The invention relates to a radial and axial mixed magnetic circuit permanent magnet synchronous side rotor motor, which belongs to the technical field of permanent magnet motors. It is to solve the problem that the eddy current loss of the motor core will increase rapidly when the power density of the existing permanent magnet motor is increased by increasing the speed and the number of pole pairs, which limits the improvement of the motor efficiency. Each of its rectangular ring slots is embedded with a winding, and the solid ring is made of soft magnetic composite material SMC; the outer edge of the magnetic side disc is covered on the left port of the magnetic outer ring, and the magnetic side circle The inner circular edge of the sheet is covered on the left port of the magnetically permeable inner ring; the magnetic poles of the magnetic steel on the magnetically permeable outer ring and the magnetically permeable inner ring are the same as the magnetic poles of the magnetic steel on the magnetically permeable side disc. The polarity is the same; the rotor gap is wrapped around the periphery of the stator, so that the axis of the rotor coincides with the axis of the stator. The invention allows the axial magnetic field and the radial magnetic field to pass through the main magnetic circuit at the same time, and at the same time allows the number of pole pairs to increase without causing rapid increase of eddy current loss.

Description

Radial and axial hybrid permanent magnet synchronous side rotor motor

technical field

The invention belongs to the technical field of permanent magnet motors.

Background technique

Permanent magnet synchronous motors and their servo systems are widely used in industrial drive and servo control fields due to their small size, high efficiency, and good dynamic response characteristics. The traditional motors with radial magnetic circuit and the disk motor with axial magnetic circuit that are common at present usually increase the motor speed or increase the number of pole pairs to increase the power density of the motor. However, with the increase of the motor speed and the number of pole pairs, The eddy current loss of the motor core will increase rapidly, which limits the improvement of the motor efficiency. Also, these motors do not generate torque at the end of the winding, so the winding utilization is low. In addition, the motor stator core is usually made of laminated silicon steel sheets, and the axial thermal conductivity and radial thermal conductivity of the motor stator differ greatly, so the heat dissipation of the motor stator is anisotropic, resulting in uneven heat dissipation inside the motor stator.

Contents of the invention

The purpose of the present invention is to provide a radial and axial mixed magnetic circuit permanent magnet synchronous side rotor motor, in order to solve the eddy current of the motor core when the existing permanent magnet motor increases the power density by increasing the speed and the number of pole pairs Losses can quickly increase, limiting the improvement in motor efficiency.

The stated purpose is achieved by the following scheme: the described radial and axial mixed magnetic circuit permanent magnet synchronous side rotor motor, which consists of a stator 1 and a rotor 2;

The stator 1 is composed of a solid ring 1-1 and a plurality of windings 1-2; the solid ring 1-1 has a plurality of rectangular ring slots 1-3 along the radial direction of the ring, and all the rectangular ring slots 1-3 are in the The upper circumference of the solid ring 1-1 is uniformly arranged; each rectangular ring groove 1-3 is embedded with a winding 1-2, and the material of the solid ring 1-1 is soft magnetic composite material SMC; the rotor 2 is made of magnetically conductive Outer ring 2-1, magnetically conductive side disc 2-2, magnetically conductive inner ring 2-3, and multiple pieces of magnetic steel 2-4; magnetically conductive inner ring 2-3 is arranged on magnetically conductive outer ring 2 Inside -1, the outer circular edge of the magnetically conductive side disc 2-2 is covered on the left port of the magnetically conductive outer ring 2-1, and the inner circular edge of the magnetically conductive side disc 2-2 is covered by the magnetically conductive inner ring On the left port of 2-3, a plurality of pieces of magnetic steel 2-4 are uniformly arranged on the inner surface of the magnetic outer ring 2-1, and the magnetic poles of all adjacent magnetic steels 2-4 are opposite in polarity; On the right side of the side disc 2-2, a plurality of magnets 2-4 are evenly arranged on the circumference, and the magnetic poles of all adjacent magnets 2-4 are opposite in polarity; the outer circular surface of the magnetically conductive inner ring 2-3 A plurality of pieces of magnetic steel 2-4 are evenly arranged on the upper circumference, and the magnetic poles of all adjacent magnetic steels 2-4 are opposite in polarity; the magnetic steel 2 on the magnetically conductive outer ring 2-1 and the magnetically conductive inner ring 2-3 The magnetic pole polarity of -4 is the same as the magnetic pole polarity of the magnetic steel 2-4 on the opposite magnetically conductive side disc 2-2; the rotor 2 gap is wrapped around the periphery of the stator 1, so that the axis line of the rotor 2 The axes of the stator 1 coincide.

Compared with the prior art, the present invention has the following advantages:

1. Compared with traditional motors, this new type of motor can effectively increase the torque per unit volume. Under the same technical requirements, the size of the motor can be reduced, and it can be used in a wide range of occasions.

2. Since the coils are concentrated in one slot, it is more convenient to go off the assembly line and save more raw materials; it can eliminate the end of the motor winding and greatly improve the space utilization.

3. The use of soft magnetic composite materials allows the axial magnetic field and radial magnetic field to pass through the main magnetic circuit at the same time, while allowing the number of pole pairs to increase without causing a rapid increase in eddy current loss.

Description of drawings

Fig. 1 is the overall structural representation of the present invention;

Fig. 2 is a schematic diagram of the cross-sectional structure along A-A in Fig. 1 .

Detailed ways

Specific embodiment one: as shown in Figure 1 and Figure 2, it consists of a stator 1 and a rotor 2;

The stator 1 is composed of a solid ring 1-1 and a plurality of windings 1-2; the solid ring 1-1 has a plurality of rectangular ring slots 1-3 along the radial direction of the ring, and all the rectangular ring slots 1-3 are in the The upper circumference of the solid ring 1-1 is uniformly arranged; each rectangular ring groove 1-3 is embedded with a winding 1-2, and the material of the solid ring 1-1 is soft magnetic composite material SMC; the rotor 2 is made of magnetically conductive Outer ring 2-1, magnetically conductive side disc 2-2, magnetically conductive inner ring 2-3, and multiple pieces of magnetic steel 2-4; magnetically conductive inner ring 2-3 is arranged on magnetically conductive outer ring 2 Inside -1, the outer circular edge of the magnetically conductive side disc 2-2 is covered on the left port of the magnetically conductive outer ring 2-1, and the inner circular edge of the magnetically conductive side disc 2-2 is covered by the magnetically conductive inner ring On the left port of 2-3, a plurality of pieces of magnetic steel 2-4 are uniformly arranged on the inner surface of the magnetic outer ring 2-1, and the magnetic poles of all adjacent magnetic steels 2-4 are opposite in polarity; On the right side of the side disc 2-2, a plurality of magnets 2-4 are evenly arranged on the circumference, and the magnetic poles of all adjacent magnets 2-4 are opposite in polarity; the outer circular surface of the magnetically conductive inner ring 2-3 A plurality of pieces of magnetic steel 2-4 are evenly arranged on the upper circumference, and the magnetic poles of all adjacent magnetic steels 2-4 are opposite in polarity; the magnetic steel 2 on the magnetically conductive outer ring 2-1 and the magnetically conductive inner ring 2-3 The magnetic pole polarity of -4 is the same as the magnetic pole polarity of the magnetic steel 2-4 on the opposite magnetically conductive side disc 2-2; the rotor 2 gap is wrapped around the periphery of the stator 1, so that the axis line of the rotor 2 The axes of the stator 1 coincide.

Soft Magnetic Composite (SMC) uses powder metallurgy technology to mold high-purity iron powder and organic materials. The surface of iron powder particles is covered with an insulating layer and organic materials for bonding. In recent years, the emergence of low eddy current loss SMC materials has injected new vitality into the research of high performance permanent magnet motors. Compared with silicon steel sheets, SMC materials have some significant advantages: isotropy, allowing complex shapes, low eddy current loss, good heat transfer, and low cost.

Working principle: a plurality of pieces of magnetic steel 2-4 are evenly arranged on the inner surface of the magnetically conductive outer ring 2-1, and the magnetic poles of all adjacent magnetic steels 2-4 are opposite in polarity; the magnetically conductive side disc 2- On the right side of 2, a plurality of magnetic steels 2-4 are evenly arranged on the circumference, and the magnetic poles of all the adjacent magnetic steels 2-4 are opposite in polarity; Sheet magnetic steel 2-4, the magnetic poles of all adjacent magnetic steels 2-4 are opposite in polarity; the magnetic poles of the magnetic steel 2-4 on the magnetic conduction outer ring 2-1 and the magnetic conduction inner ring 2-3 The same as the magnetic pole polarity of the magnetic steel 2-4 on the magnetically permeable side disc 2-2 facing opposite; Tilt in the same direction of rotation when assembled. The cut surface of the winding 1-2 is a square, and the three sides of the square are in the magnetic field and are effective sides. Due to the use of soft magnetic composite materials, the axial magnetic field and radial magnetic field are allowed to pass through the main magnetic circuit at the same time, and the number of pole pairs is allowed to increase without causing a rapid increase in eddy current loss.

Claims (1)

1. Radial and axial mixed magnetic circuit permanent magnet synchronous side rotor motor, characterized in that it consists of a stator (1) and a rotor (2); The stator (1) is composed of a solid ring (1-1) and multiple windings (1-2); the solid ring (1-1) has a plurality of rectangular ring grooves (1-3) along the radial direction of the ring ), all rectangular ring slots (1-3) are evenly arranged on the circumference of the solid ring (1-1); each rectangular ring slot (1-3) is embedded with a winding (1-2), and the solid ring ( 1-1) is made of soft magnetic composite material SMC; the rotor (2) consists of a magnetically conductive outer ring (2-1), a magnetically conductive side disc (2-2), and a magnetically conductive inner ring (2- 3) Composed of multiple pieces of magnetic steel (2-4); the magnetically conductive inner ring (2-3) is set inside the magnetically conductive outer ring (2-1), and the outer magnetically conductive side disc (2-2) The round edge is covered on the left port of the magnetically conductive outer ring (2-1), and the inner circular edge of the magnetically conductive side disc (2-2) is covered on the left port of the magnetically conductive inner ring (2-3). A plurality of pieces of magnetic steel (2-4) are evenly arranged on the inner surface of the magnetically conductive outer ring (2-1), and the magnetic poles of all adjacent magnetic steels (2-4) are opposite in polarity; the magnetically conductive side circle On the right side of the piece (2-2), a plurality of pieces of magnetic steel (2-4) are evenly arranged on the circumference, and the magnetic poles of all adjacent magnetic steels (2-4) are opposite in polarity; the magnetically conductive inner ring (2- 3) A plurality of magnetic steels (2-4) are evenly arranged on the outer surface of the outer circle, and the magnetic poles of all adjacent magnetic steels (2-4) are opposite in polarity; the magnetically conductive outer ring (2-1) and the conductive The magnetic pole polarity of the magnetic steel (2-4) on the magnetic inner ring (2-3) is the same as that of the magnetic pole polarity of the magnetic steel (2-4) on the magnetically permeable side disc (2-2) opposite ; The gap of the rotor (2) is wrapped around the periphery of the stator (1), so that the axis of the rotor (2) coincides with the axis of the stator (1).