CN101552535A - Cylinder type flux-reversal linear machine - Google Patents

Abstract

Cylindrical flux reversing linear motor. It relates to the field of motors, and solves the problems of low efficiency, large eddy current loss, complicated process, and influence on control precision and dynamic characteristics of existing linear motors. The phase unit armature core of the present invention is a ring core with 2n teeth uniformly arranged on the inner circumference, wherein n is a natural number; the phase unit armature winding is a concentrated winding, and each coil of the phase unit armature is correspondingly wound on the phase unit armature On each tooth of the core, the coils on adjacent teeth are wound in opposite directions. All the coils on the teeth of the same phase unit armature core are connected in series to form a phase unit armature winding, and the phase unit armature windings are connected in series or in parallel to form a phase unit armature winding. armature winding; the permanent magnet is pasted on the teeth of the phase unit armature core; the center distance τ t of the phase unit armature core between two adjacent phase armature units along the axial direction and the tooth pitch _τ of the secondary teeth along the axial direction _p satisfies the relationship τ _t =kτ _p ±(1/m)τ _p , k and m are natural numbers, m is the number of phases, and m≥3. It can be used as a motor or as a generator.

Description

Cylindrical Flux Inversion Linear Motor

technical field

The invention relates to motor technology, in particular to a cylindrical magnetic flux reverse linear motor.

Background technique

The structure of an existing cylindrical permanent magnet linear synchronous motor is shown in FIG. 10 . When the armature core is made of silicon steel sheets, since the direction of the laminations is axial, the direction of the armature magnetic field generated by the permanent magnet and the winding is partly in the same direction as the laminations, forming a large eddy current in the core, resulting in a larger Large eddy current loss, and the iron core lamination process is complicated, and the processing cost is high; if a solid iron core is used, although the process is simple and the cost is low, the iron core will generate greater eddy current loss, which greatly reduces the efficiency of the motor. At the same time, due to the magnetic coupling between phases, on the one hand, the existence of mutual inductance will affect the current control accuracy and the dynamic characteristics of the motor; The longer the circuit, the greater the iron loss of the stator, which limits the further improvement of the efficiency of the motor.

Contents of the invention

The present invention solves the problems of low efficiency, large eddy current loss, complex laminated iron core process and high processing cost of the existing linear synchronous motor; greater eddy current loss in the solid iron core; and mutual inductance problems that affect the control accuracy of the current and the dynamic characteristics of the motor. , and a cylindrical flux inversion linear motor is proposed.

The cylindrical magnetic flux reverse linear motor of the present invention includes a primary, a secondary and an air gap; the secondary includes secondary teeth, a spacer ring and a shaft barrel; the secondary teeth and spacer rings are arranged alternately and fixedly sleeved on the shaft barrel; the primary includes The phase armature unit and the casing; the phase armature unit is composed of the phase unit armature core and the phase unit armature winding; the phase unit armature core is a ring core with 2n teeth uniformly arranged on the inner circumference, where n is Natural number; the armature winding of the phase unit is a concentrated winding, and each coil of the armature winding of the phase unit is correspondingly wound on each tooth of the armature core of the phase unit, and the coils on the adjacent teeth of the armature core of the phase unit are wound in opposite directions. All the coils on the teeth of the armature core of the same phase unit are connected in series to form a phase unit armature winding, and the phase unit armature windings of the same phase are connected in series or in parallel to form each phase armature winding; the armature units of each phase are arranged in sequence along the axial direction on the machine In the shell, the relationship between the armature core center distance τ _t of the phase unit armature core between two adjacent phase armature units along the axial direction and the tooth pitch τ _p of the secondary teeth along the axial direction satisfies the relationship τ _t =kτ _p ±(1 /m)τ _p , where k and m are both natural numbers, when the motor is a two-phase motor, m=4, and in other cases m is equal to the number of phases of the motor.

The invention adopts a special armature structure to form a cylindrical magnetic flux reverse linear motor, which eliminates the mutual inductance between phases, and improves the current and electromagnetic force control accuracy, thrust density and dynamic characteristics of the motor. The motor can be used both as a motor and as a generator. The linear motor of the present invention has the advantages of high thrust density, strong fault tolerance, simple structure, small secondary mass, good dynamic characteristics and easy realization of modularization, etc. It can be used not only as a motor but also as a generator, and has wide applications prospect.

Description of drawings

Fig. 1 is a schematic structural view of a cylindrical magnetic flux reversal linear motor of the present invention; Fig. 2 is a schematic structural view of a second embodiment; Fig. 3 is a schematic structural view of a group of phase armature units 1 of a second embodiment; Fig. 4 is A schematic structural view of the third embodiment; FIG. 5 is a schematic structural view of a group of phase armature units 1 of the third embodiment; FIG. 6 is a schematic structural view of the fourth embodiment; FIG. 7 is a group of phase armatures of the fourth embodiment Schematic diagram of the structure of unit 1; FIG. 8 is a schematic structural diagram of the secondary tooth 6 with a fan-shaped slot along the axial direction; FIG. 9 is a schematic structural diagram of the secondary tooth 6 with a semicircular slot along the axial direction; FIG. 10 is Schematic diagram of the existing cylindrical permanent magnet linear synchronous motor.

Detailed ways

Specific Embodiment 1: This embodiment is described with reference to Fig. 1 to Fig. 9. The cylindrical magnetic flux reverse linear motor of this embodiment is composed of a primary, a secondary and an air gap;

The secondary includes secondary teeth 6, spacer rings 7 and shaft cylinder 8; the secondary teeth 6 and spacer rings 7 are arranged alternately and fixedly sleeved on the shaft cylinder 8; the characteristic is that the primary includes phase armature unit 1 and casing 2; The phase armature unit 1 is composed of the phase unit armature core 3 and the phase unit armature winding 4; the phase unit armature core 3 is a ring core with 2n teeth uniformly arranged on the inner circumference, where n is a natural number; the phase unit The armature winding 4 is a concentrated winding, and each coil of the phase unit armature winding 4 is correspondingly wound on each tooth of the phase unit armature core 3, and the winding directions of the coils on adjacent teeth of the phase unit armature core 3 are opposite. All the coils on the teeth of the armature core 3 of the same phase unit are connected in series to form a phase unit armature winding 4, and the phase unit armature windings 4 of the same phase are connected in series or in parallel to form each phase armature winding; Arranged in the casing 2 in sequence, the phase unit armature core 3 center distance τ _t between two adjacent phase armature units 1 along the axial direction and the tooth pitch τ _p of the secondary teeth 6 along the axial direction satisfy the relationship τ _t =kτ _p ±(1/m)τ _p , where k and m are natural numbers, when the motor is a two-phase motor, m=4, and in other cases m is equal to the phase number of the motor.

Specific embodiment 2: This embodiment is described in conjunction with Fig. 1, Fig. 2 and Fig. 3. The difference between this embodiment and specific embodiment 1 is that the phase unit armature core 3 is an integrated ring core, and it also includes a tile-shaped permanent magnet 5, and the phase unit armature core 3 is an integrated ring core, the magnetization direction of the tile-shaped permanent magnet 5 is radial magnetization, and the inner surface of each tooth of the phase unit armature core 3 is along the axis 2i pieces of tile-shaped permanent magnets 5 are glued in turn, where i is a natural number, then there are 2n×2i pieces of tile-shaped permanent magnets 5 in each phase armature unit 1, and every two adjacent tiles along the axial direction The magnetization direction of the permanent magnet 5 is opposite; the magnetization direction of every two adjacent tile-shaped permanent magnets 5 is opposite along the circumferential direction; the center distance τ _m of each adjacent two tile-shaped permanent magnets 5 along the axial direction The tooth pitch τ _p of the secondary teeth 6 along the axial direction satisfies the relation 2τ _m =τ _p . Other compositions and connection methods are the same as those in Embodiment 1.

Specific embodiment 3: This embodiment is described in conjunction with Fig. 4 and Fig. 5 , the difference between this embodiment and specific embodiment 1 is that it also includes a flat permanent magnet 51, and each phase unit armature core 3 is divided into j in the axial direction segment, wherein j is a natural number, j≥2; the magnetization direction of the flat permanent magnet 51 is axial magnetization, and a flat permanent magnet is fixed between two adjacent segments of the armature core 3 in each phase unit 51, then there are 2n×(j-1) planar permanent magnets 51 in each phase armature unit 1, and the magnetization directions of every two adjacent planar permanent magnets 51 along the axial direction are opposite; The magnetization directions of two adjacent flat permanent magnets 51 are opposite; the circumferential width of the flat permanent magnets 51 is less than or equal to the width of the armature teeth, and the radial height of the flat permanent magnets 51 is less than or equal to the armature teeth and the iron core. The sum of the radial heights of the yoke; the center distance τ _m of every two adjacent planar permanent magnets 51 in the axial direction and the tooth pitch τ _p of the secondary teeth 6 in the axial direction satisfy the relationship 2τ _m =τ _p .

Other compositions and connection methods are the same as those in Embodiment 1.

Embodiment 4: This embodiment is described in conjunction with Fig. 6 and Fig. 7. This embodiment is a combination of the structures of Embodiment 2 and Embodiment 3. The specific structure is based on Embodiment 2, adding specific implementation The technical characteristics of mode three, that is: it also includes a tile-shaped permanent magnet 5, the magnetization direction of the tile-shaped permanent magnet 5 is radial magnetization, and the inner surface of each section of the tooth of the phase unit armature core 3 is glued with A tile-shaped permanent magnet 5, the magnetization direction of every two adjacent tile-shaped permanent magnets 5 along the axial direction is opposite; along the circumferential direction, the magnetization direction of every adjacent two tile-shaped permanent magnets 5 is opposite; The tile-shaped permanent magnet 5 on the inner surface of each tooth of each phase unit armature core 3 and the flat-plate permanent magnet 51 on the tooth side form a series magnetic circuit.

Other compositions and connection methods are the same as those in the second embodiment.

Embodiment 5: This embodiment is described in conjunction with Fig. 8 and Fig. 9. The difference between this embodiment and Embodiment 1, 2, 3 or 4 is that there are 2n fan-shaped or half-shaped teeth on the secondary tooth 6 along the axial direction. A circular slot, the position of which corresponds to the slots of every two adjacent phase unit armature cores 3 .

In this embodiment, a plurality of slots are formed on the secondary teeth 6, so that the weight of the secondary can be reduced. Other compositions and connection modes are the same as those in Embodiment 1, 2, 3 or 4.

Embodiment 6: This embodiment differs from Embodiment 5 in that the secondary teeth 6 are made of high magnetic permeability material. Other compositions and connection methods are the same as those in Embodiment 5.

Embodiment 7: This embodiment differs from Embodiment 1 or Embodiment 6 in that the spacer ring 7 is made of non-magnetic material, and the outer diameter of the spacer ring 7 is smaller than or equal to the outer diameter of the secondary tooth 6 . Other compositions and connection modes are the same as those in Embodiment 1 or Embodiment 6.

Embodiment 8: This embodiment differs from Embodiment 1 or Embodiment 6 in that the spacer ring 7 is made of magnetic material, and the outer diameter of the spacer ring 7 is smaller than the outer diameter of the secondary teeth 6 . Other compositions and connection modes are the same as those in Embodiment 1 or Embodiment 6.

The content of the present invention is not limited to the content of the above-mentioned embodiments, and a combination of one or several specific embodiments can also achieve the purpose of the invention. The primary and secondary of the motor are outer primary inner secondary structure or outer secondary inner primary structure. The primary and secondary of the motor is a moving primary structure or a moving secondary structure.

Claims (8)

1. Cylindrical flux inversion linear motor, which includes primary, secondary and air gap; secondary includes secondary teeth (6), spacer ring (7) and shaft cylinder (8); secondary teeth (6) and The spacer rings (7) are arranged alternately and fixedly sleeved on the shaft cylinder (8); it is characterized in that the primary includes a phase armature unit (1) and a casing (2); the phase armature unit (1) is composed of a phase unit armature core (3) and the phase unit armature winding (4); the phase unit armature core (3) is a ring core with 2n teeth uniformly arranged on the inner circumference, wherein n is a natural number; the phase unit armature winding (4 ) is a concentrated winding, each coil of the phase unit armature winding (4) is correspondingly wound on each tooth of the phase unit armature core (3), and the coils on the adjacent teeth of the phase unit armature core (3) are wound On the contrary, all the coils on the teeth of the same phase unit armature core (3) are connected in series to form a phase unit armature winding (4), and the phase unit armature windings (4) of the same phase are connected in series or in parallel to form each phase armature winding; The armature units (1) of each phase are arranged in the casing (2) in sequence along the axial direction, and the center distance _τt of the armature core (3) of the phase unit between two adjacent phase armature units (1) along the axial direction and the tooth pitch τ _p of the secondary teeth (6) along the axial direction satisfy the relationship τ _t =kτ _p ±(1/m)τ _p , where k and m are natural numbers, and when the motor is a two-phase motor, take m = 4, in other cases m is equal to the phase number of the motor. 2. The cylindrical magnetic flux reversal linear motor according to claim 1, characterized in that it also includes a tile-shaped permanent magnet (5), and the phase unit armature core (3) is an integral circular ring core, The magnetization direction of the tile-shaped permanent magnet (5) is radial magnetization, and the inner surface of each tooth of the phase unit armature core (3) is sequentially adhered with 2i tile-shaped permanent magnets (5) in the axial direction. , where i is a natural number, then there are 2n×2i tile-shaped permanent magnets (5) in each phase armature unit (1), and the charge of every two adjacent tile-shaped permanent magnets (5) along the axial direction The magnetic direction is opposite; the magnetization direction of every two adjacent tile-shaped permanent magnets (5) along the circumferential direction is opposite; the center distance τ _m of every adjacent two tile-shaped permanent magnets (5) along the axial direction The relationship 2τ _m =τ _p is satisfied between the pitches τ _p to the secondary teeth ( 6 ). 3. The cylindrical magnetic flux reversal linear motor according to claim 1, characterized in that it also includes a flat permanent magnet (51), and each phase unit armature core (3) is divided into j sections in the axial direction, Wherein j is a natural number, j≥2; the magnetization direction of the flat permanent magnet (51) is axial magnetization, and a flat flat plate is fixed between two adjacent sections of the armature core (3) in each phase unit. Permanent magnets (51), then there are 2n×(j-1) flat-shaped permanent magnets (51) in each phase armature unit (1), and every two adjacent flat-shaped permanent magnets (51) along the axial direction The magnetization direction of each adjacent flat permanent magnet (51) along the circumferential direction is opposite; the circumferential direction width of the flat permanent magnet (51) is less than or equal to the width of the armature tooth, and the flat permanent magnet (51) The radial height of the magnet (51) is less _than or equal to the sum of the radial heights of the armature teeth and the iron core yoke; (6) The tooth pitch τ _p satisfies the relation 2τ _m =τ _p . 4. The cylindrical magnetic flux reversal linear motor according to claim 3, characterized in that it also includes a tile-shaped permanent magnet (5), and the magnetization direction of the tile-shaped permanent magnet (5) is radial charging. Magnetism, a piece of tile-shaped permanent magnet (5) is stuck on the inner surface of each tooth of the armature core (3) of the phase unit, and the magnetization of every two adjacent tile-shaped permanent magnets (5) along the axial direction The directions are opposite; along the circumferential direction, every two adjacent tile-shaped permanent magnets (5) have opposite magnetization directions; the tile-shaped permanent magnets (5) on the inner surface of each section tooth of each phase unit armature core (3) ) forms a series magnetic circuit with the flat permanent magnet (51) on the tooth side. 5. The cylindrical magnetic flux reversal linear motor according to claim 1, 2, 3 or 4, characterized in that 2n fan-shaped or semicircular slots are opened in the axial direction on the secondary teeth (6) , the slots correspond to the notches of every two adjacent phase unit armature cores (3). 6. The cylindrical magnetic flux reversal linear motor according to claim 5, characterized in that the secondary teeth (6) are made of high magnetic permeability material. 7. The cylindrical flux reversing linear motor according to claim 1 or 6, characterized in that it is made of non-magnetic material, and the outer diameter of the spacer ring (7) is smaller than or equal to the outer diameter of the secondary teeth (6). 8. The cylindrical magnetic flux reversal linear motor according to claim 1 or 6, characterized in that the spacer ring (7) is made of magnetic material, and the outer diameter of the spacer ring (7) is smaller than the outer diameter of the secondary teeth (6) path.

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