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KR-20260065153-A - BLAC MOTOR

KR20260065153AKR 20260065153 AKR20260065153 AKR 20260065153AKR-20260065153-A

Abstract

The present invention relates to a BLAC motor that has been improved to increase cooling efficiency and simplify manufacturing. The present invention provides a BLAC motor comprising a rotating shaft, a rotor core fixedly installed on the outer surface of the rotating shaft, and a plurality of magnets attached at predetermined intervals on the outer surface of the rotor core, wherein, when the rotating shaft rotates, the gaps between the magnets are filled with a non-magnetic material to reduce heat generation between the N pole and S pole of the magnets and prevent the magnets from falling out.

Inventors

  • 선창훈

Assignees

  • 선창훈

Dates

Publication Date
20260508
Application Date
20241101

Claims (7)

  1. A BLAC motor comprising a rotating shaft, a rotor core fixedly installed on the outer surface of the rotating shaft, and a plurality of magnets attached at predetermined intervals on the outer surface of the rotor core, A BLAC motor characterized by having a non-magnetic material filled in each gap between the magnets during rotation of the above-mentioned rotating shaft, so as to reduce heat generation between the N and S poles of the magnets and prevent the magnets from falling out.
  2. In paragraph 1, A BLAC motor characterized in that the above-mentioned non-magnetic material comprises epoxy resin.
  3. In paragraph 1, A BLAC motor characterized in that the gap is formed as a trapezoidal space whose width decreases from top to bottom.
  4. In paragraph 3, A BLAC motor characterized by the above-mentioned non-magnetic material filling the gap from the top up to 2/3.
  5. In paragraph 4, A BLAC motor characterized in that the remaining 1/3 of the gap is filled with the rotor core protrusion.
  6. In paragraph 1, A BLAC motor characterized in that the magnet is composed of a 6-pole permanent magnet.
  7. In paragraph 1, A BLAC motor characterized by preventing magnetic intrusion between the N and S poles of the magnet by filling the gap with a non-magnetic material.

Description

BLAC Motor The present invention relates to a BLAC motor, and more specifically, to a BLAC motor improved to increase cooling efficiency and simplify manufacturing. Generally, brushless motors use transistors instead of brushes and are used to drive devices such as reciprocating compressors. Meanwhile, when a motor rotates, back EMF is generated, and depending on the form of this back EMF, there are pulse wave and sign wave motors. And a BLDC motor (Brushless DC Motor) is a motor without the brushes mentioned above. Since there are motors among brushless motors where the back EMF is a square wave and a sine wave, it is necessary to distinguish them. Accordingly, in a narrow sense, a BLDC motor refers to a BLDC motor with a square wave back EMF, and a BLAC motor refers to a Brushless DC motor with a sinusoidal back EMF. The above BLAC motor can be, for example, a PMSM (Permanent Magnet Synchronous Motor), and controlling the back EMF phase and current phase flowing through the motor to be in the same phase is advantageous for torque control. As such, since the back EMF of a BLAC motor is in the form of a sinusoidal wave, the current must also be applied in the form of a sinusoidal wave, and a driving method called FOC (Field Oriented Control) or Vector Control is used. Accordingly, BLAC motors are slightly more complex than BLDC motors in terms of control. FIG. 1 is a cross-sectional view of a conventional BLAC motor, and as shown in FIG. 1, a rotor (30) that interacts electromagnetically with the stator (20) is provided within the stator (20). The rotor (30) has a rotating shaft (31) installed at its center and is equipped with a stacked core (32), and a magnet (33) is disposed on the outer surface of the core (32). And to fix the magnet (33), the outer surface of the magnet (33) is surrounded by a fixing can (34), and the hollow fixing can (34) is formed in the shape of a cylinder with the top and bottom open. In addition, magnets manufactured by ordinary sintering are susceptible to damage from external impacts. If a magnet breaks, the broken fragments negatively affect the motor's operation. For this reason, in motors using sintered magnets, a can is installed to surround the magnet to prevent broken magnet fragments from entering the interior of the motor. And although not shown in the drawing, a cooling housing was inserted between the magnets (33) and the magnets (33), and water was filled into the cooling housing to lower the temperature of the motor. Accordingly, conventional BLAC motors had a complex manufacturing process and a problem with reduced cooling efficiency due to the water cooling method. FIG. 1 is a cross-sectional view showing the internal configuration of a BLAC motor according to conventional technology. FIG. 2 is a perspective view showing the external configuration of a BLAC motor according to the present invention. FIG. 3 is a half-sectional view of the BLAC motor of FIG. 1 and FIG. 2. Fig. 4 is an enlarged configuration diagram of the main part configuration of Fig. 3. FIG. 5 is a side cross-sectional view of FIG. 4. Fig. 6 is a detailed view of the gap in Fig. 5. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. FIG. 2 shows a perspective view illustrating the external configuration of a BLAC motor according to the present invention. In addition, Figure 3 shows a half-sectional view of the BLAC motor of Figures 1 and 2, and Figure 4 shows an enlarged configuration of the main part of Figure 3. In addition, Figure 5 shows a side cross-sectional view of Figure 4, and Figure 6 shows a detailed view of the gap of Figure 5. Referring to FIGS. 2 to 6, a BLAC motor (100) according to the present invention comprises a rotor and a stator, and a rotor that interacts electromagnetically with the stator is provided within the stator. The rotor comprises a rotating shaft (110), a rotor core (120) fixedly installed on the outer surface of the rotating shaft (110), a plurality of magnets (130) attached at predetermined intervals on the outer surface of the rotor core (120), and a fixing can (140) installed on the outer surface of the magnets (130) to fix the magnets (130). The above fixed can (140) is hollow and cylindrical, and is made of stainless steel (SUS 304). It is preferable that such a fixed can (140) be installed in a manner that encloses the magnet (130) to prevent broken pieces of the magnet (130) from entering the interior of the BLAC motor (100) according to the present invention. Additionally, when the rotation shaft (110) rotates, each gap (150) between the magnets (130) is filled with a non-magnetic material (151) to reduce heat generation between the N and S poles of the magnets (130) and to prevent the magnets (130) from falling out. In particular, as shown in FIG. 5, the gap (150) is filled with a non-magnetic material (151), thereby preventing magnetic interference between the N pole a