JPH0347061B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a synthetic resin molded electric motor, and in particular, the present invention relates to a synthetic resin molded electric motor, and in particular, the inner circumferential surface of the rotor core is on the outer circumferential surface of the stator core. Regarding a corresponding external rotor type electric motor.

(Prior art) Conventionally, in an external rotor type electric motor in which the inner circumferential surface of a rotor core is opposed to the outer circumferential surface of a stator core with a predetermined gap, windings are wound around the stator core. A stator is provided in which the ends of the windings are molded with synthetic resin to form a molded stator to improve insulation. and,
The lead wire led out from the winding is connected in advance to a terminal of a terminal block, and the terminal block is attached to the terminal block while being partially embedded in the synthetic resin layer during the molding.

(Problems to be Solved by the Invention) In the conventional configuration, the terminal block and the terminals attached thereto are in a state of protruding from the outer surface of the synthetic resin layer. In this case, there is a problem that the terminal block or the terminals are damaged, and there is also a problem that the space occupied by the stator increases as the terminal block and the terminals protrude.

The present invention has been made in view of the above circumstances, and its purpose is to prevent the terminal block or terminal from being damaged by external force such as collision with an object, and to prevent the terminal block or terminals from being damaged by being applied as a stator. An object of the present invention is to provide an electric motor that does not require an increase in space.

[Structure of the Invention] (Means for Solving the Problems) The electric motor of the present invention is formed so that the inner peripheral surface of a stator core and the windings wound around the stator core are covered with a synthetic resin layer. a stator having a hollow portion in the center; a partition wall formed of synthetic resin to divide the hollow portion of the stator into two;
A bearing mechanism disposed on one side of the hollow section divided into two by the partition wall, a terminal block disposed on the other side of the hollow section divided into two, and a terminal block of the stator core supported by the bearing mechanism. It is characterized by a configuration including a rotor having rotor cores facing each other with a predetermined gap on the outer peripheral surface.

(Function) According to the electric motor of the present invention, since the terminal block is disposed within the hollow part of the stator, the terminal block and its terminals do not protrude beyond the outer surface of the synthetic resin layer covering the windings. Therefore, no external force such as an object colliding with the terminal block or terminals will be applied.

(Example) An example of the present invention will be described below based on the drawings.

First, a molded electric motor will be described with reference to FIG. 1 is a stator, which is
A stator winding 3 is wound around an annular stator core 2 formed by laminating a large number of silicon steel plates.
The entire inner peripheral surface of the stator core 2 and both ends of the stator winding 3 are molded with a synthetic resin layer 4, so that the outer peripheral surface 2a of the stator core 2 is exposed, and the central part is molded with a synthetic resin layer 4. Hollow portions 6 and 7 are formed which are divided into two by a partition wall 5. Reference numeral 8 denotes a terminal block having a plurality of terminals 9 (only one is shown) and a protrusion 8a as a positioning part in the center. 6 and is integrally fixed to the partition wall 5. Reference numeral 10 denotes a bearing mechanism, which is formed by fitting and fixing a bearing medal 12 and an oil-containing member 13 to a bearing support 11, and fittingly fixing it into the hollow portion 7 of the stator 1. Reference numeral 14 denotes a rotor, which has a rotor core 16 embedded in a rotor support 15 so that an inner circumferential surface 16a is exposed, and a rotating shaft 17 fitted in the center of the rotor support 15. The rotating shaft 17 is inserted through the bearing support 11 and supported by the bearing metal 12, and the inner peripheral surface 16a of the rotor core 16 is aligned with the outer peripheral surface 2a of the stator core 2.
They are arranged to face each other with a predetermined gap between them.

The stator 1 is molded using a mold A as shown in FIG. 2, which will be described below. That is, B is the first
This mold has a molding recess C that opens on the right side.
A protrusion D is provided in the center of the rear wall of the molded recess C, and a recess Da that fits into the protrusion 8a of the terminal block 8 is formed in the protrusion D. Reference numeral E denotes a second mold, in which a molding recess F is formed which is open on the left side, and a protrusion G is protruded from the center of the back wall of this molding recess F. A pouring passage H passing through from side to side is formed, and its right end opening is a pouring port Ha, and its left end opening is a spout Hb facing the recess Da. Then, the protrusion 8a of the terminal block 8 is connected to the first
The terminal block 8 is positioned and attached to the protrusion G by fitting into the recess Da of the first mold B, and the outer peripheral surface 2a of the stator core 2 is fitted into the molding recess C of the first mold B and fixed. The left end of the child winding 3 is stored in the molded recess C,
Further, the left end surface of the second mold E is brought into contact with the right end surface of the first mold B, and the right end portion of the stator winding 3 is housed in the molding recess F. As a result, a gap I is formed between the molds B and E, the stator core 2, and the stator winding 3, and the spout Hb of the pouring path H has a gap J, which is a partition wall forming part. It comes to face the terminal block 8. In addition, 18 is a lead wire of the stator winding 3,
This is connected to the terminal 9 of the terminal block 8 in advance. Then, when a molten synthetic resin made of unsaturated polyester resin mixed with a filler such as calcium carbonate, glass fiber, and a low shrinkage agent is injected from the spout Ha, the molten synthetic resin is poured into the terminal block 8 from the spout Hb. By being injected and colliding with each other, the liquid is divided in the vertical direction in FIG. 2, and is supplied to the entire area of the gap I and the gap J, thereby forming the synthetic resin layer 4 and the partition wall 5. At this time, the terminal block 8 is pressed against the protrusion D of the first mold B by the injection pressure of the molten synthetic resin injected from the spout Hb and is securely held, and the terminal block 8 Since the terminal block 8 is molded with synthetic resin with the peripheral part 8b protruding into the gap I, the terminal block 8 is fixed to the partition wall 5 with the peripheral part 8b embedded in the synthetic resin layer 4.

As described above, according to this embodiment, by fitting the protruding part 8a of the terminal block 8 into the recess Da of the first mold B, the terminal block 8 is molded with synthetic resin while being positioned and held in the protruding part D. Since the terminal block 8 is molded, the terminal block 8 can be fixed to the partition wall 5 while being positioned inside the hollow part 6, and therefore the terminal block 8 and the terminal 9 can protrude beyond the outer surface of the synthetic resin layer 4. The terminal block 8 or the terminal 9 will not be damaged by external force such as an object colliding with the terminal block 8 or the terminal 9, and is also different from the conventional case in which the terminal block is arranged to protrude from the stator. In contrast, the space occupied by the stator 1 equipped with the terminal block 8 does not increase. Furthermore, according to this embodiment, since the synthetic resin molten metal is injected onto the terminal block 8 during molding of the stator 1, the synthetic resin molten metal is quickly divided and supplied over the entire gap I. Therefore, a uniform synthetic resin layer 4 can be obtained, and since molten synthetic resin is not directly injected onto the stator winding 3, there is no risk of disconnection or short-circuiting of the stator winding 3. Furthermore, according to this embodiment, the protrusion 8 of the terminal block 8
a into the recess Da of the first mold B and position it, and then spray synthetic resin molten metal onto the terminal block 8 to press and hold the terminal block 8 against the protrusion D of the first mold B. As a result, the terminal block 8 is reliably positioned and held within the mold B, and there is no gap between the terminal block 8 and the protrusion D, thus preventing the occurrence of burrs due to leakage of molten synthetic resin. It is something without.

The present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with various modifications without departing from the spirit thereof.

[Effects of the Invention] As explained above, in the electric motor of the present invention, the terminal block is disposed in the hollow part divided into two by the partition wall of the stator, so that objects may not collide with the terminal block or the terminals. This provides an excellent effect in that there is no possibility of damage due to the application of external force, and that the space occupied by the stator equipped with the terminal block does not increase.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal side view, and FIG. 2 is a transverse plan view of the mold in a state in which a stator is accommodated. In the drawing, 1 is a stator, 2 is a stator core, 2a is an outer peripheral surface, 3 is a stator winding, 4 is a synthetic resin layer, 5 is a partition wall, 6 and 7 are hollow parts, 8 is a terminal block, 8a
9 is a protrusion, 9 is a terminal, 10 is a bearing mechanism, 14 is a rotor, 16 is a rotor core, A is a mold, and J is a gap.

Claims (1)

[Claims] 1 stator 1, terminal block 8, bearing mechanism 10,
An electric motor having a rotor 14 and a stator 1
In this example, the stator core 2 is annular, the winding 3 is wound around the stator core 2, and the stator core 2 is molded with synthetic resin.In the central space, there is a partition wall integrally molded with the resin. The bearing mechanism 10 is arranged in one of the hollow parts 6, 7, and the terminal block 8 is arranged in the other of the hollow parts 6, 7. The rotor 14 is arranged in
An electric motor characterized in that the rotor core 16 is supported by a bearing mechanism 10 and faces the outer circumferential surface 2a of the stator core 2 with a predetermined gap therebetween.