JP6113866B2 - Configuration of DC plastic packing motor - Google Patents

Description

  The present invention relates to a structure of a direct current plastic packing motor.

  Conventionally, air-conditioning plastic packing DC motors have a short service life, and major failures are concentrated in the electric corrosion of ball bearings. 1) Plastic packing DC motor is controlled by PWM signal, switching at high speed, and shaft voltage is generated between the inner and outer rings of the bearing, causing dielectric breakdown in the bearing lubricant and causing shaft current. Inner / outer ring wavy wear occurs, leading to abnormal noise. 2) The cause of electrolytic corrosion is current discharge, and there is an insulating material between the DC plastic packing / motor end cover and the stator core, and it is completely insulated. When high-frequency modulation voltage passes through the stator winding, a voltage difference is formed between the metal end covers due to the coupling effect, and the current forms a circuit through the end cover corresponding to the rotating shaft and bearing, and the current is The oil film is destroyed and discharged between the inner and outer rings of the bearing, causing a high temperature, melting in the local part of the bearing, causing spots and pits, increasing the speed of wear, generating noise, The service life is shortened.

  An object of the present invention is to provide a structure of a DC plastic packing motor. Design is simple, reasonable and convenient to manufacture, can effectively reduce shaft current, reduce electric corrosion, extend the life of ball bearings, and reduce motor failure and noise.

The present invention includes a front end cover, a rear end cover, a plastic packing stator package, a rotor package, a front bearing that is a ball bearing and a rear bearing that is a ball bearing, and the plastic packing stator package includes a stator core, a fixed Including a child winding and a plastic packing shell, a cavity is formed in the center of the plastic packing stator package, the front end cover is made of a non-magnetic material, and the front end cover is fitted to one end of the plastic packing shell; A front bearing is attached to the front bearing chamber of the front end cover, the rear end cover is made of metal, the rear end cover is attached to the other end of the plastic packing shell, and an insulating layer is formed on the inner wall surface of the rear bearing chamber in the rear end cover. laid he, rear bearing after Installed in the receiving chamber, insulation layer isolates and insulates the rear bearing and the rear end cover, the rotor package is installed in the cavity, and the rotating shaft on the rotor package is attached to and supported by the front and rear bearings It is the structure of the direct current plastic packing motor characterized by this.

  The rear end cover is an SPCC steel press part or a cast aluminum part.

  The insulating layer is made of high strength plastic.

  The front end cover is integrated with the plastic packing shell by injection molding, and the front end cover is wrapped in the plastic packing shell.

  The rotor package is a permanent magnet, includes an outer core, an inner core, and a rotating shaft, the rotating shaft is attached to the inner core, the outer core and the inner core are connected to an insulating buffer belt, and the permanent magnet is the outer core. Attached to.

  The front end cover is made of an insulating plastic material or PPS plastic.

  According to the conventional technique, the present invention has the following effects.

1) The front end cover is made of non-magnetic material such as insulating plastic, insulated from the front bearing, and the rear end cover is made of metal, ensuring machining accuracy and concentricity of the front and rear bearings, and the rear bearing chamber in the rear end cover he insulating layer is laid on the inner wall surface of the rear bearing mounted on the rear bearing chamber, the insulating layer is to insulate and isolate the rear bearing and the rear end cover, the coupling effect is lowered, the front end cover and front bearing, The current path between the rear end cover and the rear bearing can be cut. This design is simple, reasonable and convenient to manufacture, can effectively lower shaft current, reduce electric corrosion, extend the life of ball bearings, and reduce motor failure and noise. 2) The rotor package is a permanent magnet and includes an outer core, an inner core and a rotating shaft. The rotating shaft is attached to the inner core, the outer core and the inner core are connected to an insulating buffer belt, and the permanent magnet is the outer core. As a result, the shaft current and electric corrosion caused by the rotor package can be effectively reduced. 3) he insulating layer is laid on the inner wall surface of the bearing chamber after the rear end cover, an insulating layer is plastic high strength, since the rear end cover is a SPCC steel pressed parts or cast aluminum parts, parts manufacturing precision, The concentricity of the front bearing and the rear bearing is guaranteed, the structure is simple, and it can be manufactured conveniently. 4) Since the front end cover is integrated with the plastic packing shell by injection molding and the front end cover is wrapped in the plastic packing shell, the structural strength of the front end cover is improved.

Three-dimensional view of the present invention Exploded view 1 of the present invention Exploded view 2 of the present invention Front view of the present invention A-A cross section of Fig. 4 Configuration principle diagram behind the plastic packing shell of the present invention

  Next, the present invention will be described in detail with reference to specific examples and drawings.

As shown in FIGS. 1 to 6, a kind of DC plastic packing motor configuration, including front end cover 3, rear end cover 4, plastic packing stator package 1, rotor package 2, front bearing 5 and rear bearing 6, The plastic packing stator package 1 includes a stator core 12, a stator winding 13, and a plastic packing shell 11. A cavity 14 is formed in the center 1 of the plastic packing stator package, and the front end cover 3 is made of a nonmagnetic material. The front end cover 3 is fitted to one end of the plastic packing shell 11 and the front bearing 5 is attached to the front bearing chamber 31 of the front end cover 3, and the rear end cover 4 Is made of metal, and the rear end cover 4 is attached to the other end of the plastic packing shell 11. Lighted, he insole insulating layer 42 on the inner wall surface of the bearing chamber 41 after the rear end cover 4, a rear bearing 6 is attached to the rear bearing chamber 41, the insulating layer 42 to isolate the rear bearing 6 and the rear end cover 4 Insulated, rotor package 2 is installed in cavity 14, rotating shaft 21 on rotor package 2 is mounted and supported on front bearing 5 and rear bearing 6, and rear end cover 4 is SPCC steel press part or cast aluminum part It is. The insulating layer 42 is made of high-strength plastic, and the front end cover 3 is integrated with the plastic packing shell 11 by injection molding, and the plastic packing shell 11 wraps the front end cover 3. The rotor package 2 includes a permanent magnet 22, an outer core 24, an inner core 23, and a rotating shaft 21. The rotating shaft 21 is attached to the inner core 23, the outer core 24 and the inner core 23 are connected by an insulating buffer belt 25, and the permanent magnet 22 is attached to the outer core 24.

As a principle of the present invention, the front end cover 3 is made of insulating plastic, the front end cover 3 is insulated from the front bearing 5, and the rear end cover 4 is made of metal, so that machining accuracy and concentricity of the front and rear bearings are ensured. he insole insulating layer 42 on the inner wall surface of the bearing chamber 41 after the rear end cover 4, a rear bearing 6 is attached to the rear bearing chamber 41, the insulating layer 42 to insulate and isolate the rear bearing 6 and the rear end cover 4 This reduces the coupling effect and cuts the current path between the front end cover and the front bearing, and the rear end cover and the rear bearing. This design is simple, reasonable and convenient to manufacture, can effectively lower shaft current, reduce electric corrosion, extend the life of ball bearings, and reduce motor failure and noise. The outer core 24 and the inner core 23 of the rotor package 2 are connected by an insulating buffer belt 25, and the permanent magnet 22 is attached to the outer core 24, so that axial current and electric corrosion caused by the rotor package can be effectively reduced.

DESCRIPTION OF SYMBOLS 1 ... Plastic packing stator package 2 ... Stator package 3 ... Front end cover 4 ... Rear end cover 5 ... Front bearing 6 ... Rear bearing 11 ... Plastic packing shell 12 ... Stator core 13 ... Stator winding 14 ... Cavity 21 ... Rotating shaft 22 ... Permanent magnet 23 ... Inner core 24 ... Outer core 25 ... Insulation buffer belt 31 ... Front bearing chamber 41 ... Rear bearing chamber 42 ... Insulating layer

Claims (7)

Including a front end cover, a rear end cover, a plastic packing stator package, a rotor package, a front bearing that is a ball bearing and a rear bearing that is a ball bearing ,
The plastic packing stator package includes a stator core, a stator winding and a plastic packing shell, and a cavity is formed in the center of the plastic packing stator package;
The front end cover is made of non-magnetic material, the front end cover is fitted to one end of the plastic packing shell,
A front bearing is installed in the front bearing chamber of the front end cover,
The rear end cover is made of metal,
Rear end cover is attached to the other end of the plastic packing shell, it insole insulating layer on the inner wall surface of the bearing chamber after the rear end cover,
The rear bearing is mounted in the rear bearing chamber,
An insulating layer isolates the rear bearing and rear end cover and insulates them.
A structure of a direct current plastic packing motor, wherein a rotor package is installed in a cavity, and a rotating shaft on the rotor package is attached to and supported by a front bearing and a rear bearing.   2. The structure of a direct current plastic packing motor according to claim 1, wherein the rear end cover is an SPCC steel press part or a cast aluminum part.   3. The structure of the direct current plastic packing motor according to claim 1, wherein the insulating layer is made of high-strength plastic.   4. The structure of the direct current plastic packing motor according to claim 3, wherein the front end cover is integrated with the plastic packing shell by injection molding.   The rotor package is a permanent magnet, includes an outer core, an inner core, and a rotating shaft, the rotating shaft is attached to the inner core, the outer core and the inner core are connected to an insulating buffer belt, and the permanent magnet is the outer core. 5. The structure of the direct current plastic packing motor according to claim 4, wherein the direct current plastic packing motor is attached to the motor.   5. The structure of a direct current plastic packing motor according to claim 4, wherein the front end cover is wrapped in a plastic packing shell.   3. The structure of a direct current plastic packing motor according to claim 1, wherein the front end cover is made of insulating plastic or PPS plastic.

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