JP2009243297A - Motor driven compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor driven compressor for securing insulating property without soaking a neutral point with lubricating oil. <P>SOLUTION: The motor driven compressor comprises a housing 1 storing mechanism parts, a motor mechanism part 5 stored in a motor housing 2, a compression mechanism part 6 arranged in a compressor housing 3 for compressing refrigerant, and a drive circuit part 7 arranged in a front housing 4 for controlling the motor mechanism part 5 to be driven. The motor mechanism part 5 consists of a rotor 10 arranged at the center of the motor housing 2 and integrally fixed to a driving shaft 9 for rotating the driving shaft 9, and a stator 11 arranged between the motor housing 2 and the rotor 10. The stator 11 is formed with teeth 14 on which a conductor 13 is wound, and the neutral point 15 of the conductor 13 on the teeth 14 is provided on the upper part in the vertical direction of a vehicle in the state that the motor driven compressor is mounted thereon. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric compressor in which a motor that is a drive source of a compression mechanism is housed in a housing together with the compression mechanism.

Conventionally, as described in Patent Document 1, a rotor, a stator having a plurality of tooth portions, and a conductive winding in which a coil portion is formed by performing concentrated winding on the teeth portion, As a conductive winding, an electric motor has been proposed in which the outer periphery of a group of core wires in which a plurality of core wires are bundled is insulated.
JP 2002-044892 A

  By the way, as described in Patent Document 1, it is common to use a conductive winding in which an outer periphery of a group of core wires in which a plurality of core wires are bundled is used, and where neutral points are arranged Was set arbitrarily.

  However, depending on the type of lubricating oil (for example, PAG oil) for maintaining lubrication in the compressor, there has been a problem that the insulating property of the conductive wire is remarkably lowered.

  Moreover, since the place to arrange | position is set arbitrarily, there existed a possibility that a neutral point might be immersed in the lubricating oil collected in the compressor.

  Then, an object of this invention is to provide the electric compressor which can ensure insulation, without lubricating oil being immersed in a neutral point.

  A cylindrical housing that is mounted on a vehicle and accommodates each mechanism portion, a motor mechanism portion that is accommodated in the motor housing of the housing, and that is disposed in the compressor housing and is driven by the motor mechanism portion to be contained in the housing. An electric compressor comprising: a compression mechanism portion of the housing that compresses the sucked refrigerant; and a drive circuit portion that is disposed in a front housing and drives and controls the motor mechanism portion. The motor mechanism portion includes the motor A cylindrical rotor arranged at the center of the housing and fixed integrally with the drive shaft to rotate the drive shaft, and arranged between the inner peripheral wall of the motor housing and the outer peripheral surface of the rotor to rotate the rotor The stator is formed of a plurality of teeth around which a conductive wire is wound, and the plurality of tees Neutral point of the conductor is characterized in that provided on the upper side in the vehicle vertical direction in the electric compressor mounted state.

  The invention according to claim 2 is the electric compressor according to claim 1, wherein the neutral point is provided in a slot portion between the teeth.

  According to a third aspect of the present invention, in the electric compressor according to the first or second aspect, an oil reservoir is provided at a lower side in a vehicle vertical direction when the electric compressor is mounted, and the oil reservoir is centered on the drive shaft. The neutral point is provided on the opposite side.

  According to a fourth aspect of the present invention, in the electric compressor according to the first to third aspects, the neutral point is provided in a slot portion located on the upper side of the horizontal center line of the housing. It is characterized by that.

  According to the present invention, the neutral point is disposed on the upper side in the vehicle up-down direction with the electric compressor mounted, so that the compressor is not immersed in the lubricating oil.

  Further, even when the insulating property of the lubricating oil is lowered and the amount is abnormally increased, the possibility that the neutral point is immersed in the lubricating oil is extremely low, so that the insulating property can be ensured.

  Hereinafter, the details of the electric compressor according to the present invention will be described based on the embodiments shown in the drawings.

  FIG. 1 is a cross-sectional view of the electric compressor, and FIG. 2 is a cross-sectional view taken along line AA.

  As shown in FIG. 1, the electric compressor of this embodiment includes a cylindrical housing 1 that is mounted on a vehicle and accommodates each mechanism, a motor mechanism 5 accommodated in a motor housing 2 of the housing 1, and a compressor. A compression mechanism 6 of the housing 1 that compresses the refrigerant that is disposed in the housing 3 and is driven by the motor mechanism 5 and sucked into the housing 1, and a drive mechanism that controls the motor mechanism 5 that is disposed in the front housing 4. Drive circuit unit 7.

  As shown in FIGS. 1 and 2, the housing 1 includes a front housing 4, a compressor housing 3, and a motor housing 2. The front housing 4 and the compressor housing 3 are assembled together by bolts (not shown). The compressor housing 3 and the motor housing 2 are integrally assembled by inserting a bolt (not shown) into a bolt insertion hole 19 provided in the flange portion 17 and screwing it. Further, a sealing property is secured between the motor housing 2 and the compressor housing 3 and between the compressor housing 3 and the front housing 4 by an O-ring (not shown) or the like.

  As shown in FIGS. 1 and 2, the motor mechanism unit 5 is arranged at the center of the motor housing 2, is fixed to the drive shaft 9 and is fixed to the columnar rotor 10 that rotates the drive shaft 9, and the motor housing 2. The stator 11 is disposed between the inner peripheral wall of the rotor 10 and the outer peripheral surface of the rotor 10 and rotates the rotor 10.

  The stator 11 is formed by a plurality (9 in this embodiment) of teeth 14, and a conductive wire 13 is wound around the teeth 14. A magnetic field is generated by passing a current through the conducting wire 13 to drive the rotor 10 to rotate.

  The rotor 10 is disposed in a stator 11 formed in a columnar shape, is fixed integrally with the drive shaft 9, is rotated by a magnetic force generated around the teeth 14, and rotationally drives the integrally formed drive shaft 9. .

  Here, the connecting portion (neutral point 15) drawn out from the conductive wire 13 concentrates the conductive wire 13 wound around the teeth 14, peels off the coating of the conductive wire 13, and performs insulation treatment (for example, after winding with paper, vinyl And is disposed in the slot portion 18 between the teeth 14 on the upper side in the vehicle vertical direction with the electric compressor mounted.

  An oil sump 16 is integrally provided on the outer periphery of the housing 1 on the lower side (the lower side of the motor housing 2 in the vehicle vertical direction). The oil reservoir 16 stores lubricating oil that has lubricated the motor mechanism 5 and the compression mechanism 6.

  The compression mechanism 6 is formed by a drive shaft 9 and a rotor 10 fixed to the drive shaft 9. As described above, the drive shaft 9 is disposed at the center of the housing 1 and is fixed integrally with the rotor 10 of the motor mechanism. Then, the rotor 10 is rotationally driven by the magnetic force generated in the teeth 14, the drive shaft 9 is rotated, and the rotor 6 a of the compression mechanism unit 6 is rotated to compress the refrigerant sucked into the housing 1.

  The drive circuit unit 7 is formed of a control board or the like, and drives and controls the motor mechanism unit 5.

  In the above-described configuration, a magnetic field is generated in the teeth 14 by passing a current through the teeth 14, the drive shaft 9 fixed integrally with the rotor 10 rotates, and the drive shaft 9 rotates to drive the compression mechanism unit 6. .

  According to the above-described electric compressor, the neutral point 15 of the conducting wire 13 converged from the plurality of teeth 14 is provided in the slot portion 18 on the upper side in the vehicle vertical direction when the electric compressor is mounted. Even when the amount of lubricating oil that maintains the lubricity is abnormally large, the possibility of contact between the neutral point 15 and the lubricating oil is extremely low, so that insulation can be ensured. Further, since the oil reservoir 16 is provided on the lower side around the drive shaft 9, the neutral point 15 is not immersed in the lubricating oil. Further, since the neutral point 15 is provided in the slot portion 18 positioned on the upper side of the horizontal center line B of the housing 1, the neutral point 15 is not immersed in the lubricating oil.

1 is a cross-sectional view of an electric compressor according to an embodiment of the present invention. 1 shows an embodiment of the present invention and is a cross-sectional view taken along line AA in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Motor housing 3 Compressor housing 4 Front housing 5 Motor mechanism part 6 Compression mechanism part 6a Rotor 7 Drive circuit part 9 Drive shaft 10 Rotor 11 Stator 13 Conductor 14 Teeth 15 Neutral point 16 Oil reservoir 17 Flange part 18 Slot part 19 Bolt insertion hole

Claims (4)

A cylindrical housing that is mounted on a vehicle and accommodates each mechanism portion, a motor mechanism portion that is accommodated in the motor housing of the housing, and that is disposed in the compressor housing and is driven by the motor mechanism portion to be contained in the housing. In the electric compressor comprising: a compression mechanism portion of the housing that compresses the sucked refrigerant; and a drive circuit portion that is disposed in the front housing and drives and controls the motor mechanism portion.
The motor mechanism portion is disposed at a central portion of the motor housing and is fixed integrally with the drive shaft to rotate the drive shaft, and between the inner peripheral wall of the motor housing and the outer peripheral surface of the rotor. A stator that is arranged and rotates the rotor,
The stator is formed of a plurality of teeth around which a conducting wire is wound, and a neutral point of the conducting wires of the plurality of teeth is provided on an upper side in a vehicle vertical direction when the electric compressor is mounted. Electric compressor to do. The electric compressor according to claim 1,
The electric compressor characterized in that the neutral point is provided in a slot portion between the teeth. The electric compressor according to claim 1 or 2,
An electric compressor characterized in that an oil reservoir is provided on the lower side in the vehicle vertical direction when the electric compressor is attached, and the neutral point is provided on the opposite side of the oil reservoir with a drive shaft as a center. The electric compressor according to any one of claims 1 to 3,
The electric compressor according to claim 1, wherein the neutral point is provided in a slot portion located above the horizontal center line of the housing.

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