Method for fixing shell and magnetic steel of outer rotor permanent magnet motor

Abstract

A method for fixing an outer rotor permanent magnet motor casing and magnetic steel relates to the technical field of outer rotor permanent magnet motor production, and comprises the following steps: designing a casing which is composed of a first cylinder and a second cylinder, the first cylinder is formed by rolling and butt welding of steel plates, the second cylinder is formed by rolling and butt welding of steel plates, and the first cylinder and the second cylinder are assembled and welded; two end surfaces of the casing are firstly processed, then surfaces matched with the magnetic steel are processed, and the inner arc-shaped surface of the casing is attached to the outer arc-shaped surface of the magnetic steel; the magnetic pole pressing plate is pressed on the inner circle of the shell; the two magnetic pole pressing plates are installed on the inner side of the machine shell through the screws, the screws do not need to be fastened, the arc-shaped magnetic steel is installed between the magnetic pole pressing plates through the clamping fixture, at the moment, the fastening screws and the two bevel edges of the magnetic pole pressing plates press the bevel edges of the magnetic steel tightly, and the magnetic steel is fastened and positioned. The bevel edge of the magnetic pole pressing plate is used for pressing the magnetic steel, the purpose of fixing the magnetic steel can be effectively achieved under the condition that the magnetic steel is not punched, and meanwhile the magnetic pole pressing plate is lower than the arc face of the magnetic steel after being fastened and does not interfere with rotation of a motor.

Description

Technical Field

[0001] The present invention relates to the technical field of outer rotor permanent magnet motor production, and in particular to a method for fixing an outer rotor permanent magnet motor casing and magnetic steel, and a method for installing and fixing a permanent magnet with a curved surface. Background Art

[0002] For outer rotor permanent magnet motors, the permanent magnets are installed on the inner side of the motor's circular casing. Since the inner side of the casing is an arc-shaped surface, it needs to fit and be fixed to the arc-shaped surface of the permanent magnets. The process of installing and fastening the permanent magnets is relatively complicated, so it is necessary to design a method and structure for this arc-shaped surface fitting and fixing of the permanent magnets. Summary of the Invention

[0003] In view of this, it is necessary to provide a method for fixing the outer rotor permanent magnet motor casing and the magnetic steel.

[0004] A method for fixing an outer rotor permanent magnet motor casing and magnetic steel comprises the following steps:

[0005] Design the casing, which consists of a first cylinder and a second cylinder. The first cylinder is made of steel plates rolled and butt-welded, and the second cylinder is made of steel plates rolled and butt-welded. The first cylinder and the second cylinder are welded together.

[0006] The housing is first machined on both ends, and then the matching surface with the magnet is machined, so that the inner arc surface of the housing fits with the outer arc surface of the magnet;

[0007] The magnetic pole pressure plate is pressed tightly against the inner circle of the casing;

[0008] Use screws to install two magnetic pole pressure plates on the inside of the casing. The screws do not need to be tightened. Use a jig to install the arc-shaped magnet between the magnetic pole pressure plates. At this time, tighten the screws. The two oblique sides of the magnetic pole pressure plates will press the oblique sides of the magnet tightly, which plays a role in fixing the magnet in place.

[0009] Preferably, the first cylinder is made of rolled steel plates and butt-welded; the processing length is 1160mm and the inner circle is Φ1144mm; the second cylinder is made of rolled steel plates and butt-welded, the processing length is 825mm and the outer circle is Φ1144mm, and the processing is 7×40×M8-6H. This screw hole is a screw hole for tightening the magnetic steel, and the circumferential position accuracy requirement is relatively high.

[0010] Preferably, the casing is welded by heating the first cylinder, installing the second cylinder into the first cylinder, welding the cylinder together after cooling, and performing heat treatment and aging treatment after welding.

[0011] Preferably, the magnetic steel is manufactured by wire cutting, the outer arc surface R560mm fits the Φ1120mm of the casing, and both sides of the inner arc surface of the magnetic steel are chamfered, and the magnetic pole pressure plate is pressed against the inner circle of the casing in the later stage.

[0012] Preferably, the magnetic pole pressure plate is a stainless steel component, the middle through hole is installed on the casing for later fastening screws, and the edge with an inclination angle of 86.78° presses the magnetic steel inclined surface to fix the magnetic steel on the inner side of the casing cylinder.

[0013] There are two main methods for mounting and securing the curved housing to the curved surface of the magnet: gluing and screwing. Adhesive bonding is more reliable against environmental factors such as moisture, temperature, and vibration; therefore, the present invention uses screws to mount and secure the permanent magnet. Using the beveled edge of the pole plate to press against the magnet effectively secures the magnet without drilling holes in the magnet. Furthermore, once secured, the pole plate is lower than the curved surface of the magnet, preventing interference with motor rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the first cylinder and the second cylinder;

[0015] Figure 2 for Figure 1 Schematic diagram of the medium AA perspective structure;

[0016] Figure 3 This is a schematic diagram of the magnetic steel and casing assembly structure;

[0017] Figure 4 for Figure 3 Schematic diagram of the medium AA perspective structure;

[0018] In the figure: first cylinder 1, second cylinder 2, housing 3, magnetic pole pressure plate 4, screw 5, permanent magnet 6, and retaining ring 7. DETAILED DESCRIPTION

[0019] In order to make the technical solution of the present invention easier to understand, the technical solution of the present invention is now clearly and completely described in the form of specific embodiments in conjunction with the accompanying drawings.

[0020] Please also see Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The method for fixing the outer rotor permanent magnet motor casing and the magnetic steel includes the following steps:

[0021] Design the casing, the casing 3 is composed of a first cylinder 1 and a second cylinder 2, the first cylinder 1 is made of steel plates rolled and butt-welded, the second cylinder 2 is made of steel plates rolled and butt-welded, and the first cylinder 1 and the second cylinder 2 are welded together;

[0022] The housing 3 is first machined on both end faces, and then the matching surface with the magnetic steel is machined, so that the inner arc surface of the housing fits with the outer arc surface of the magnetic steel;

[0023] The magnetic pole pressure plate 4 is pressed tightly against the inner circle of the housing 3; the two ends of the permanent magnet 6 are equipped with retaining rings 7;

[0024] Install two pole pressure plates 4 inside the housing 3 using screws 5. The screws do not need to be tightened. Use a jig to install the arc-shaped magnet between the pole pressure plates 4. Tighten the screws. The two beveled edges of the pole pressure plates 4 press against the beveled edge of the magnet, securing the magnet in place. Screws 5 are M8×25 slotted countersunk screws.

[0025] The first cylinder 1 is made of rolled steel plate and butt-welded; the processing length is 1160mm and the inner circle is Φ1144mm; the second cylinder 2 is made of rolled steel plate and butt-welded, the processing length is 825mm and the outer circle is Φ1144mm, the processing is 7×40×M8-6H, this screw hole is for tightening the magnetic steel screw hole, and the circumferential position accuracy requirement is relatively high.

[0026] The casing 3 is welded by heating the first cylinder 1, installing the second cylinder 2 into the first cylinder 1, and welding the cylinder after cooling. The cylinder 3 is then heat treated and aged after welding.

[0027] The magnetic steel is made by wire cutting, and the outer arc surface R560mm fits the casing Φ1120mm. The two sides of the inner arc surface of the magnetic steel are chamfered, and the magnetic pole pressure plate is pressed against the inner circle of the casing 3 in the later stage.

[0028] The magnetic pole pressure plate 4 is a stainless steel component with a middle through hole for later fastening screws installed on the casing 3. The edge with an inclination angle of 86.78° presses the magnetic steel inclined surface to fix the magnetic steel on the inner side of the casing cylinder.

[0029] There are two main ways to install and fix the arc of the housing and the arc of the magnetic steel: one is gluing, and the other is screw fastening. Gluing is more reliable under external environmental factors such as moisture, temperature, and vibration. Therefore, the present invention uses screw fastening to install and fix the permanent magnet. In this way, the present invention uses the oblique edge of the magnetic pole pressure plate to press the magnetic steel to effectively fix the magnetic steel without punching holes in the magnetic steel. At the same time, after being fastened, the magnetic pole pressure plate is lower than the arc surface of the magnetic steel and does not interfere with the rotation of the motor. It should be noted that the embodiments described herein are only some embodiments of the present invention, not all implementation methods of the present invention. The embodiments are only exemplary and their role is only to provide a more intuitive and clear way to understand the content of the present invention, rather than to limit the technical solution described in the present invention. Without departing from the concept of the present invention, all other implementation methods that ordinary technicians in this field can think of without creative work, as well as other simple replacements and various changes to the technical solution of the present invention, are within the scope of protection of the present invention.

Claims

1. A method for fixing an outer rotor permanent magnet motor housing and a magnetic steel, characterized by: The method for fixing the outer rotor permanent magnet motor housing and the magnetic steel includes the following steps: Design the casing, which consists of a first cylinder and a second cylinder. The first cylinder is made of steel plates rolled and butt-welded, and the second cylinder is made of steel plates rolled and butt-welded. The first cylinder and the second cylinder are welded together. The housing is first machined on both ends, and then the matching surface with the magnet is machined, so that the inner arc surface of the housing fits with the outer arc surface of the magnet; The magnetic pole pressure plate is pressed tightly against the inner circle of the casing; Use screws to install two magnetic pole pressure plates on the inside of the casing. The screws do not need to be tightened. Use a jig to install the arc-shaped magnet between the magnetic pole pressure plates. At this time, tighten the screws. The two oblique sides of the magnetic pole pressure plates will press the oblique sides of the magnet tightly, which plays a role in fixing the magnet in place.

2. The method for fixing the outer rotor permanent magnet motor housing and the magnetic steel according to claim 1, characterized in that: The first cylinder is made of steel plate rolled and butt-welded, with a processing length of 1160mm and an inner diameter of Φ1144mm. The second cylinder is made of steel plate rolled and butt-welded, with a processing length of 825mm and an outer diameter of Φ1144mm, and a processing size of 7×40×M8-6H. This screw hole is a screw hole for tightening magnetic steel, and the circumferential position accuracy requirement is relatively high.

3. The method for fixing the outer rotor permanent magnet motor housing and the magnetic steel according to claim 1, characterized in that: The casing welding is performed by heating the first cylinder, installing the second cylinder into the first cylinder, and welding the cylinder after cooling. The cylinder is then heat treated and aged after welding.

4. The method for fixing the outer rotor permanent magnet motor housing and the magnetic steel according to claim 1, characterized in that: The magnet is made by wire cutting. The outer arc surface R560mm fits the Φ1120mm of the casing. Both sides of the inner arc surface of the magnet are chamfered, and the pole pressure plate is pressed against the inner circle of the casing in the later stage.

5. The method for fixing the outer rotor permanent magnet motor housing and the magnetic steel according to claim 1, characterized in that: The magnetic pole pressure plate is a stainless steel component with a through hole in the middle for later fastening screws to be installed on the casing. The edge with an inclination angle of 86.78° presses the magnetic steel slope to fix the magnetic steel on the inner side of the casing cylinder.

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