JP2005348474A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor that is small in size, high in efficiency, less in a temperature rise of a stator winding, and high in reliability. <P>SOLUTION: In the motor, a cylindrical frame 3 is thermally inserted to the external periphery of a stator 1 that is bond-fitted with a core 1a after a winding 1c is wound to the core 1a that is dividedly laminated at pole tooth units in the circumferential direction. Since the motor is filled with a heat transfer member 6 in a gap between and among the frame 3, core 1a and a recess 1b, heat generated at the winding 1c is easily transferred to the frame 3 via the core 1a, the heat is dissipated to the air from the external surface of the frame 3, and the temperature rise of the motor is thus suppressed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat dissipation structure for an electric motor in which a split stator is mounted in a frame.

  In recent years, motors for industrial use have been required to have high efficiency and high functionality, and brushless motors with high efficiency, good controllability, and long life have been developed. It is known that after concentrating windings on pole teeth, the split surfaces are joined and combined to improve the space factor of the stator windings (see, for example, Patent Document 1).

In addition, there is a demand for an electric motor with a small temperature rise for longer life and miniaturization. Although it is not a split core, the thermal conductivity is between the coil end of the stator coil and the outer frame surface to which the stator core is fixed. There is known a stator coil cooling structure in which a good member is interposed (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 7-7875 JP-A-60-28750

  The problem to be solved is to suppress the temperature rise of the stator winding while maintaining the miniaturization and high efficiency by the split iron core and the concentrated winding. The heat generated by an electric motor is a loss, and has a great influence on the life of parts such as bearings.

  In other words, in motors that have concentrated windings on the split core to improve the occupancy rate, the outer periphery of the split core is provided with a recess for positioning during welding or joining of the split split cores. The heat of the winding could not be dissipated sufficiently to the frame.

  Further, since the contact area with the frame is reduced by the recess, the stator may move in the frame due to a reaction when a large current flows through the winding.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described conventional problems, and to provide a small and highly efficient electric motor with a small temperature rise in a stator winding and high reliability.

  In order to solve the above-mentioned problems, the present invention attaches a cylindrical frame to the outer periphery of the stator to which the divided iron core is bonded and fixed after winding the divided iron core laminated in the circumferential direction in units of pole teeth. In this motor, the frame is fixed to the stator by interposing a heat transfer member having good thermal conductivity in a recess provided in the outer periphery of the center of the pole teeth of the divided iron core. In addition, after applying a heat transfer member with good thermal conductivity to the outer periphery of the iron core of the stator, the frame is baked into the stator.

  According to the electric motor of the present invention, heat generated in the winding is dissipated from the stator core through the heat transfer member to the frame, and the temperature rise of the winding can be suppressed.

  Further, the heat transfer member in which the metal powder is mixed with the adhesive can suppress the temperature rise of the windings and can prevent the stator from moving in the frame.

  Therefore, it is possible to obtain a small and highly efficient electric motor with high reliability.

  In an electric motor in which a cylindrical frame is mounted on the outer periphery of a stator to which the divided iron core is bonded and fixed after winding the divided iron core laminated in the circumferential direction in units of pole teeth, the center of the pole teeth of the divided iron core In the electric motor, the frame is fixed to the stator by interposing a heat transfer member with good thermal conductivity in a recess provided on the outer periphery.

  Example 1 is an electric motor in which a cylindrical frame is mounted on the outer periphery of a stator that is bonded and fixed after winding an iron core divided into 12 parts.

  In FIG. 1, 1 is a stator, 2 is a rotor, 3 is a frame, 4 is an output shaft side bracket, 5 is a counter output shaft side bracket, and 6 is a heat transfer member made of silicon.

  The stator 1 is composed of an iron core 1a and a winding 1c that are divided into 12 poles in the circumferential direction and laminated, and after applying a winding 1c that is concentratedly wound around each insulated pole tooth, The divided surfaces are joined (FIG. 2). This iron core 1 is provided with a recess 1b on the outer periphery of the center of the pole teeth, facilitating ensuring accuracy during annular joining. Thereafter, the heat transfer member 6 is applied to the outer periphery of the recess 1 b and the iron core 1, and the aluminum frame 3 is shrinked and fixed to the outer periphery of the stator 1.

  The rotor 2 is composed of a rotating shaft 2a and a permanent magnet 2b, and the outer peripheral surface of the permanent magnet 2b fixed to the rotating shaft 2a is magnetized in 8 poles. Then, after the bearings are press-fitted and fixed at predetermined positions on the rotor 2, the bearings are mounted in the center of the iron core 1 a, mounted on the housings of the output shaft side bracket 4 and the counter output shaft side bracket 5, and then output shaft side brackets 4 and the non-output shaft side bracket 5 are fixed with screws through the stator 1.

  Thus, since the heat transfer member 6 is filled in the gap between the frame 3 and the iron core 1a and the recess 1b, the heat generated in the winding 1c can be easily transferred to the frame 3 through the iron core 1a. Since the heat is dissipated from the outer surface 3 to the atmosphere, the temperature rise of the motor is suppressed. Therefore, it becomes a small and highly efficient electric motor with high reliability.

  In addition, instead of silicon as the heat transfer member of Example 1, a liquid adhesive mixed with metal powder can also be implemented. In addition to the same effect, the stator can be securely fixed and fixed when the motor is started. The child can be prevented from moving. Moreover, it can implement also with the split iron core without a recessed part, and can anticipate the same effect.

  The electric motor of the present invention is also useful for facilities that dislike temperature rise, applications that require high reliability, and long life.

Sectional drawing of the electric motor in Example 1 of this invention Sectional drawing around the stator in Example 1 of the present invention

Explanation of symbols

1 Stator 1a Iron Core 1b Recess 1c Winding 3 Frame 6 Heat Transfer Member

Claims (3)

In an electric motor in which a cylindrical frame is mounted on the outer periphery of a stator to which the divided iron core is bonded and fixed after winding the divided iron core laminated in the circumferential direction in units of pole teeth, the center of the pole teeth of the divided iron core An electric motor in which the frame is fixed to a stator with a heat transfer member having good thermal conductivity interposed in a recess provided on the outer periphery. In an electric motor in which a cylindrical frame is mounted on the outer periphery of a stator to which the divided iron core is bonded and fixed after winding is applied to the divided iron cores laminated in the circumferential direction in units of pole teeth, heat is applied to the outer periphery of the stator core. An electric motor in which a heat transfer member having good conductivity is applied and then the frame is baked into a stator. The electric motor according to claim 1, wherein the heat transfer member is formed by mixing metal powder with an adhesive.

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