A PCB linear motor, sky-rail travel mechanism and sky-rail train

Abstract

The present invention discloses a PCB linear motor, including a motor control system, and also including a magnetically coupled stator and a mover, wherein the stator includes a main stator and two auxiliary stators respectively connected to two ends of the main stator, and the mover includes an active mover and an auxiliary mover connected to one end of the active mover, and the auxiliary mover is provided with a PCB circuit board connected to the motor control system. The present invention designs the stator of the linear motor as a structure combining the main stator and the auxiliary stator, and designs the mover of the linear motor as a structure combining the active mover and the auxiliary mover, and arranges the PCB board in the auxiliary mover, so that the heat dissipation efficiency of the linear motor can be improved while reducing the edge effect of the linear motor.

Description

Technical Field

[0001] The invention relates to the field of motors, and in particular to a PCB linear motor, an aerial rail traveling mechanism and an aerial rail train. Background Art

[0002] In many fields, the motion path of the controlled object is often in a straight line. For a long time, people have obtained the final linear motion, unidirectional displacement or bidirectional reciprocating displacement by rotating motors plus mechanical transformation links. Obviously, this way of obtaining linear motion is "indirect" in nature, and an intermediate mechanical transmission transformation device is required to convert circular motion into linear motion. In order to avoid the use of intermediate devices, linear motors are born. Due to the advantages of fast speed, simple structure, stable operation, high sensitivity and low cost, linear motors have been used in more and more fields, especially in transportation, mechanical loading and unloading, and mechanical processing.

[0003] Although linear motors have many advantages over traditional rotating motors, their efficiency and power factor are much lower than those of rotating motors of the same capacity, especially at low speeds. This is mainly due to two aspects: First, the disconnection of the two ends of the iron core of the linear motor stator (equivalent to the stator of a rotating motor) produces an end effect, which can cause problems such as waveform distortion, which directly increases motor losses and reduces the efficiency and power factor of the linear motor. Second, the PCB board of the linear motor is usually set on the mover (equivalent to the rotor of a rotating motor), and the mover is also equipped with an armature coil with high heat generation, which directly affects the heat dissipation of the linear motor, thereby reducing the efficiency and power factor of the linear motor.

[0004] Therefore, how to design the structure of the linear motor to improve the efficiency and power factor of the linear motor is of great significance. Summary of the invention

[0005] In view of this, the present application provides a PCB linear motor, which reduces the edge effect of the linear motor while improving the heat dissipation efficiency of the linear motor. To solve the above technical problems, the present invention is implemented by the following technical means:

[0006] A PCB linear motor includes a motor control system and a magnetically coupled stator and mover, wherein the stator includes a main stator and two auxiliary stators respectively connected to two ends of the main stator, and the mover includes an active mover and an auxiliary mover connected to one end of the active mover, and the auxiliary mover is provided with a PCB circuit board connected to the motor control system.

[0007] Furthermore, the main stator is provided with N poles and S poles alternately along the moving direction of the mover on the surface opposite to the mover, and the N poles and S poles are both made of permanent magnetic materials. The auxiliary stator is made of magnetic conductive material. The main mover is provided with teeth on the surface opposite to the stator, and armature coils are provided in the teeth.

[0008] Furthermore, the active element is provided with one or more grooves at both ends.

[0009] Furthermore, the width of the groove is twice its depth.

[0010] Furthermore, a U-shaped groove is provided in the iron core of the active motor, and a cooling pipe for carrying a coolant is provided in the U-shaped groove.

[0011] Furthermore, the PCB circuit board is provided with a magnetic field sampling circuit and a signal conversion circuit which are connected to each other;

[0012] The magnetic field sampling circuit is used to collect the magnetic field signal generated by the mover during the movement and convert the magnetic field signal into a voltage signal, and then output the voltage signal to the signal conversion circuit;

[0013] The signal conversion circuit is used to convert the voltage signal into a mover position signal, and then output the mover position signal to the control system. The control system controls the motor according to the mover position signal.

[0014] An empty track travel mechanism comprises the above-mentioned PCB linear motor, a track beam and a bogie arranged in the track beam, the stator of the PCB linear motor is fixedly mounted on the track beam, and the mover of the PCB linear motor is connected to the bogie.

[0015] Furthermore, the bogie is provided with a wear-resistant layer made of wear-resistant material on the surface in contact with the track beam.

[0016] Furthermore, the wear-resistant layer is detachably arranged on the bogie.

[0017] A skyrail train comprises the above-mentioned skyrail running mechanism and a train body connected to a bogie.

[0018] The present invention designs the stator of the linear motor as a structure combining a main stator and an auxiliary stator, designs the mover of the linear motor as a structure combining an active mover and an auxiliary mover, and arranges a PCB board in the auxiliary mover, thereby reducing the end effect of the linear motor and improving the heat dissipation efficiency of the linear motor. Specifically, when setting the travel range of the mover, only the main stator needs to be considered. Since the auxiliary stator connected to the main stator is added, the end effect of the main stator can be reduced or eliminated, thereby improving the efficiency and power factor of the linear motor. By providing grooves at both ends of the active mover, the main harmonics of the end force can be effectively eliminated, thereby greatly weakening the fluctuations of the end normal force and thrust, and can further improve the efficiency and power factor of the linear motor. In addition, arranging the PCB board on the auxiliary mover can reduce the heat generation of the active mover and improve the heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the PCB linear motor structure provided in Example 1.

[0020] Figure numerals: 1-stator, 101-main stator, 102-auxiliary stator, 2-mover, 201-main stator, 202-auxiliary mover, 203-PCB circuit board, 203-tooth slot, 204-armature coil, 205-groove, 206-U-shaped slot. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] Example 1

[0023] like Figure 1 As shown, this embodiment provides a PCB linear motor, including a motor control system, and also includes a magnetically coupled stator 1 and a mover 2, wherein the stator 1 includes a main stator 101 and two auxiliary stators 102 respectively connected to the two ends of the main stator 1, and the mover 2 includes an active mover 201 and an auxiliary mover 202 connected to one end of the active mover 201, and the auxiliary mover 202 is provided with a PCB circuit board 3 connected to the motor control system.

[0024] It should be noted here that the end effect of the linear motor is not only reflected in the stator, but also in the mover. Arranging an auxiliary mover on the mover can reduce the end effect of the linear motor on the one hand, and on the other hand, the PCB circuit board can be arranged therein, which can reduce the heating problem of the active mover, which is not only beneficial to the heat dissipation of the active mover, but also beneficial to the maintenance and repair of the PCB circuit board in the later stage (without removing the active mover), thereby reducing the later cost. In addition, when implementing this embodiment, an auxiliary mover can be arranged at both ends of the active mover to achieve the purpose of reducing the end effect of the linear motor.

[0025] Specifically, in this embodiment, the main stator 1 is provided with N poles and S poles alternately along the moving direction of the mover 2 on the surface opposite to the mover 2, and the N poles and S poles are both made of permanent magnetic materials. The auxiliary stator 102 is made of magnetic conductive material. The main mover 201 is provided with tooth slots 203 on the surface relative to the stator 1, and the armature coils 204 are provided in the tooth slots 203.

[0026] It should be noted here that the stator is set to a permanent magnet type, and the permanent magnet provides a constant magnetic field, so that the linear motor can achieve greater output per unit size, less heat, low cooling requirements, no need for electrical excitation, and low processing cost. In addition, in this embodiment, only the active mover has teeth slots, and the auxiliary mover is only used to place the PCB circuit board and low-level end effects. The power division is clear and maintenance is convenient. Moreover, adding an auxiliary mover without teeth slots can reduce the tooth slot effect at both ends of the mover, thereby further reducing the end effect of the linear motor and improving the efficiency and power factor of the linear motor and other performance indicators.

[0027] Specifically, one or more grooves 205 are provided at both ends of the active element 201 .

[0028] It should be noted here that when the linear motor is running, it will be subject to large thrust fluctuations and normal force fluctuations. The thrust and normal force are also called end forces, which are caused by the end effect. Setting a groove structure at both ends of the active sub-sub can eliminate the odd harmonics of the thrust wave and the normal force fluctuation. Since the fundamental wavelength of the single-ended thrust fluctuation and normal force fluctuation caused by the end effect is one pole pitch, the two differ by 90 degrees. The peak value of the second harmonic of the normal force is only 1 / 4 of the fundamental wave, and the peak value of the second harmonic of the thrust is only 1 / 2 of the fundamental wave. Therefore, setting a groove structure at both ends of the active sub-sub can effectively weaken the thrust fluctuation and normal force fluctuation of the linear motor.

[0029] Preferably, the width of the groove is twice the depth. In addition, in this embodiment, the core length of the active motor can be designed to be 3 or more pole pitch lengths to further reduce the end effect of the linear motor.

[0030] Specifically, a U-shaped groove is arranged in the iron core of the active motor, and a cooling pipe for carrying a coolant is arranged in the U-shaped groove.

[0031] Specifically, in this embodiment, the PCB circuit board is provided with a magnetic field sampling circuit and a signal conversion circuit connected to each other;

[0032] The magnetic field sampling circuit is used to collect the magnetic field signal generated by the mover during the movement and convert the magnetic field signal into a voltage signal, and then output the voltage signal to the signal conversion circuit;

[0033] The signal conversion circuit is used to convert the voltage signal into a mover position signal, and then output the mover position signal to the control system. The control system controls the motor according to the mover position signal.

[0034] Example 2

[0035] This embodiment provides an empty track walking mechanism, including the PCB linear motor provided in Example 1, and also including a track beam and a bogie arranged in the track beam, the stator of the PCB linear motor is fixedly mounted on the track beam, and the mover of the PCB linear motor is connected to the bogie.

[0036] Specifically, the bogie is provided with a wear-resistant layer made of wear-resistant material on the surface in contact with the track beam.

[0037] Specifically, the wear-resistant layer is detachably arranged on the bogie.

[0038] Example 3

[0039] This embodiment provides an aerial rail train, including the aerial rail running mechanism provided in Embodiment 2, and also including a train body connected to the bogie.

[0040] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A PCB linear motor, comprising a motor control system, and also comprising a magnetically coupled stator and mover, characterized in that: The stator includes a main stator and two auxiliary stators respectively connected to the two ends of the main stator, the mover includes an active mover and an auxiliary mover connected to one end of the active mover, and the auxiliary mover is provided with a PCB circuit board connected to the motor control system; The main stator is provided with N magnetic poles and S magnetic poles alternately on the surface opposite to the mover along the moving direction of the mover, and the N magnetic poles and S magnetic poles are both made of permanent magnetic materials, the auxiliary stator is made of magnetic conductive material, and the main mover is provided with tooth slots on the surface opposite to the stator, and the armature coils are arranged in the tooth slots; Wherein, the active element is provided with one or more grooves at both ends, and the width of the groove is twice the depth; A U-shaped groove is provided in the iron core of the active motor, and a cooling pipe for loading a coolant is provided in the U-shaped groove; and, The PCB circuit board is provided with a magnetic field sampling circuit and a signal conversion circuit which are connected to each other; The magnetic field sampling circuit is used to collect the magnetic field signal generated by the mover during the movement and convert the magnetic field signal into a voltage signal, and then output the voltage signal to the signal conversion circuit; The signal conversion circuit is used to convert the voltage signal into a mover position signal, and then output the mover position signal to the control system. The control system controls the motor according to the mover position signal.

2. An empty rail travel mechanism, comprising the PCB linear motor according to claim 1, characterized in that: It also includes a track beam and a bogie arranged in the track beam, the stator of the PCB linear motor is fixedly mounted on the track beam, and the mover of the PCB linear motor is connected to the bogie.

3. The empty rail travel mechanism according to claim 2, characterized in that: The bogie is provided with a wear-resistant layer made of wear-resistant material on the surface in contact with the track beam.

4. The empty rail travel mechanism according to claim 3, characterized in that: The wear-resistant layer is detachably arranged on the bogie.

5. An aerial rail train, comprising the aerial rail travel mechanism according to any one of claims 2 to 4, characterized in that: Also included is a train body connected to the bogie.

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