JP2010183786A - Mold motor - Google Patents

Abstract

[PROBLEMS] To provide a high-quality mold motor that does not cause a decrease in flow pressure at the resin flow end during molding, a decrease in mechanical strength due to insufficient gas or air discharge, or a decrease in weld strength due to a release agent. The purpose is to provide.
A stator is integrally molded with a thermosetting resin, and a thermosetting resin is formed to form a compression molded portion, and a thermosetting resin that is injection molded to form an injection molded portion. A jacket 18 is formed from the resin 12b. The compression molded portion 14 is configured to be positioned at the flow end of the thermosetting resin 12b that flows by injection molding, and the injection molded resin is combined with the resin of the compression molded portion 14 without lowering the flow pressure. Therefore, a reduction in the bonding strength can be suppressed, and a high-quality molded motor 1 that does not cause cracks at the resin bonding portion can be obtained.
[Selection] Figure 1

Description

  The present invention relates to a molded motor integrally molded with a resin, which is mainly mounted on an electric device.

  2. Description of the Related Art In recent years, motors mounted on electrical equipment such as a ventilator have been demanded for motors that are reduced in size, thickness, and weight while ensuring high quality.

  Conventionally, this type of mold motor has a configuration disclosed in Patent Document 1.

  The molded motor will be described below with reference to FIG.

As shown in the figure, a stator core 106 having a plurality of teeth portions 112 extending radially inward and spaced apart in the circumferential direction, and formed by laminating a plurality of silicon steel plates, and teeth portions of the stator cores 106. A stator 101 having a stator coil 108 formed by winding a conducting wire around 112, a rotor rotatably provided inside the stator 101, and a resin mold body 130 covering the stator 101 are provided. The mold body 130 has a space 132 formed between the stator coils 108.
Japanese Patent Laid-Open No. 11-356022

  In such a conventional motor, the weld bond strength decreases due to a decrease in the flow pressure at the flow end portion of the resin during molding, and the weld bond strength due to the orientation of the glass fibers contained in the resin along the weld line. The mechanical strength of the molded product may be reduced due to a decrease in the amount of gas generated in the mold at the time of molding and pushed to the flow end of the resin. There is a problem that weld cracks may occur due to a decrease in the mechanical strength of the molded product due to insufficient discharge of collected air, or due to insufficient bond strength of the weld part due to the action of the release agent contained in the resin. No decrease in fluid pressure at the resin flow end, decrease in mechanical strength due to insufficient gas or air discharge, or decrease in weld strength due to release agent action High-quality molded motor is required.

  In order to solve the above problems, the present invention is a mold stator in which a stator core and an armature winding are integrally molded with a thermosetting resin, and a mold stator that is rotatably disposed facing the mold stator. A mold motor comprising a rotor, wherein the mold stator comprises an injection molding portion and a compression molding portion.

  By this means, the injection-molded resin can be bonded to the resin of the compression-molded portion while the flow pressure before the flow pressure is reduced, so that a decrease in bond strength can be suppressed. Thus, a high quality molded motor that does not cause cracks at the joints can be obtained.

  In order to solve the above-mentioned problem, the compression molding portion is located at the flow end, and has a configuration of a molded motor.

  By this means, the injection-molded resin can be combined with the resin of the compression-molded portion located at the flow end while the fluid pressure before the fluid pressure is lowered is high, and further the resin of the injection-molded portion. The air and generated gas contained in is dispersed around the compression molded part located at the flow end, and the resin density is increased at the bonded part, so it is possible to suppress a decrease in bond strength and to ensure higher quality. A molded motor that can realize the above is obtained.

  Further, in order to solve the above-mentioned problem, the molding motor has a configuration in which the curing time of the thermosetting resin in the compression molding portion is longer than the curing time of the thermosetting resin in the injection molding portion. It is.

  By this means, the resin is bonded to the injection molded part before the resin surface of the compression molded part is cured and before the release agent contained in the resin of the compression molded part is lifted to the surface to cause a releasing action. It is possible to obtain a molded motor that can suppress a decrease in strength and can achieve higher quality.

  Moreover, in order to solve the said subject, the quantity of the mold release agent contained in the thermosetting resin of the compression molding part was reduced rather than the quantity of the mold release agent contained in the thermosetting resin of the injection molding part. This is a structure of a molded motor characterized by the above.

  By this means, before the mold release agent contained in the resin of the compression molding part is raised on the surface by the heat of the mold, the resin of the compression molding part and the resin of the injection molding part are combined, so that the bonding strength is reduced. Thus, a molded motor capable of further ensuring high quality can be obtained.

  In order to solve the above-mentioned problem, the glass fiber length contained in the thermosetting resin of the compression molded part is shorter than the glass fiber length contained in the thermosetting resin of the injection molded part. The mold motor is configured as follows.

  By this means, the glass fiber contained in the thermosetting resin in the injection-molded part is broken by the rotation of the screw during metering of the molding machine, so it is equivalent to the length of the glass fiber in the compression-molded part. Since the molding shrinkage rate and the linear expansion coefficient of the portion and the injection molded portion are equal, generation of cracks due to stress strain and thermal shrinkage can be suppressed, and a molded motor capable of further ensuring high quality can be obtained.

  In order to solve the above-mentioned problems, the thermosetting resin in the compression molding portion is softer than the thermosetting resin in the injection molding portion.

  By this means, the resin in the compression molded part is further compressed by the flow pressure of the resin in the injection molded part, so the amount of air discharged from the beginning of the resin in the compression molded part increases, and voids are generated. Since the resin density in the compression-molded portion can be suppressed, a decrease in the mechanical strength of the resin can be suppressed, and a molded motor capable of further ensuring high quality can be obtained.

  Moreover, in order to solve the said subject, the particle size of the filler contained in the thermosetting resin of the compression molding part was made larger than the particle size of the filler contained in the thermosetting resin of the injection molding part. This is a feature of the molded motor.

  By this means, the amount of resin absorption of the filler contained in the compression molded portion is reduced, so that the thermosetting resin in the compression molded portion becomes softer than the thermosetting resin in the injection molded portion and is contained in the compression molded portion. The gas is more easily discharged due to the flow pressure of the resin in the injection-molded part, and the resin density in the compression-molded part becomes higher, so it is possible to suppress the decrease in mechanical strength due to voids, and to ensure higher quality. A mold motor that can be realized is obtained.

  Moreover, in order to solve the said subject, the ratio of the aluminum hydroxide of the filler contained in the thermosetting resin of the compression molding part is the ratio of the aluminum hydroxide of the filler contained in the thermosetting resin of the injection molding part. It is set as the structure of the mold motor characterized by having made it less.

  By this means, the amount of resin absorption of the filler contained in the compression molded portion is reduced, so that the thermosetting resin in the compression molded portion becomes softer than the thermosetting resin in the injection molded portion and is contained in the compression molded portion. The gas is more easily discharged due to the flow pressure of the resin in the injection-molded part, and the resin density in the compression-molded part becomes higher, so it is possible to suppress the decrease in mechanical strength due to voids, and to ensure higher quality. A mold motor that can be realized is obtained.

  Further, in order to solve the above-mentioned problem, the amount of styrene monomer contained in the thermosetting resin of the compression molding part is reduced from the amount of styrene monomer contained in the thermosetting resin of the injection molding part. This is a motor configuration.

  By this means, even if the resin in the compression molding part stays in the high temperature mold for a long time, the amount of styrene contained in the resin crosslinks to produce low molecular weight polystyrene is reduced. Since the amount of gas to be generated can be reduced and the void generation at the joint portion can be suppressed, and the strength of the joint portion can be prevented from being lowered, a molded motor capable of further ensuring high quality can be obtained.

  In order to solve the above problems, the ratio of the low shrinkage agent contained in the thermosetting resin of the compression molded part is larger than the percentage of the low shrinkage agent contained in the thermosetting resin of the injection molded part. The mold motor is configured as follows.

  By this means, the molding shrinkage rate of the resin in the compression molded part is reduced, so the stress strain that occurs during molding solidification can be reduced, so that it is possible to suppress a decrease in mechanical strength and to achieve even higher quality. A mold motor that can be obtained is obtained.

  Further, in order to solve the above-mentioned problems, a molded motor is characterized in that a gas discharge part is provided at a joint part where the compression molding part and the injection molding part are joined.

  By this means, the air and the generated gas contained in the resin in the injection molded part are dispersed around the compression molded part located at the flow end part and discharged from the gas discharge part, so that the resin density is increased in the joint part. For this reason, it is possible to obtain a molded motor that can suppress a decrease in bond strength and can further ensure high quality.

  In order to solve the above-mentioned problem, a molded motor is characterized in that a gas discharge portion is provided at a substantially central portion of the compression molding portion.

  By this means, the air and the generated gas contained in the resin of the compression molding part are compressed by the flow pressure of the resin of the injection molding part, so that they are discharged from the gas discharge part located substantially at the center of the compression molding part. Thus, a reduction in mechanical strength due to voids in the compression-molded portion can be suppressed, and a molded motor capable of further ensuring high quality can be obtained.

  According to the present invention, the injection-molded resin can be bonded to the resin in the compression-molded portion while the flow pressure before the flow pressure is reduced is high, so that a decrease in bond strength can be suppressed. In addition, it is possible to provide a molded motor that ensures high quality without causing cracks at the resin bonding sites.

  In addition, the injection molded resin can be combined with the resin of the compression molded portion located at the flow end while the flow pressure before the flow pressure is lowered is high, and is further included in the resin of the injection molded portion Air and generated gas are dispersed around the compression-molded part located at the flow end, and the resin density is high at the joint part, so it is possible to suppress a decrease in bond strength and to ensure a higher quality. A motor can be provided.

  Also, since the resin surface of the compression molded part is cured and the release agent contained in the resin of the compression molded part is bonded to the injection molded part before the mold release action occurs on the surface, the bond strength is increased. It is possible to provide a molded motor that can suppress the decrease and further ensure high quality.

  In addition, before the mold release agent contained in the resin of the compression molding part rises to the surface due to the heat of the mold, the resin of the compression molding part and the resin of the injection molding part are bonded, so the decrease in bond strength is suppressed. It is possible to provide a molded motor that ensures higher quality.

  In addition, since the glass fiber contained in the thermosetting resin of the injection molded part is broken by the rotation of the screw at the time of molding machine weighing, it becomes equivalent to the length of the glass fiber of the compression molded part. Since the molding shrinkage rate and the linear expansion coefficient of the injection-molded part are equal, the generation of cracks due to stress strain and thermal shrinkage can be suppressed, and a mold motor that can further ensure high quality can be provided.

  Also, since the resin in the compression molded part is further compressed by the flow pressure of the resin in the injection molded part, the amount of air discharged from the beginning of the resin in the compression molded part increases, and the generation of voids can be suppressed. Since the resin density of the compression-molded portion is increased, it is possible to suppress a decrease in the mechanical strength of the resin, and it is possible to provide a molded motor that further ensures high quality.

  In addition, since the amount of resin absorption of the filler contained in the compression molded portion is reduced, the thermosetting resin in the compression molded portion is softer than the thermosetting resin in the injection molded portion, and the gas contained in the compression molded portion is Due to the flow pressure of the resin in the injection-molded part, it becomes easier to be discharged, and the resin density in the compression-molded part becomes higher, so it is possible to suppress the decrease in mechanical strength due to voids, and to ensure a higher quality A motor can be provided.

  In addition, since the amount of resin absorption of the filler contained in the compression molded portion is reduced, the thermosetting resin in the compression molded portion is softer than the thermosetting resin in the injection molded portion, and the gas contained in the compression molded portion is Due to the flow pressure of the resin in the injection-molded part, it becomes easier to be discharged, and the resin density in the compression-molded part becomes higher, so it is possible to suppress the decrease in mechanical strength due to voids, and to ensure a higher quality A motor can be provided.

  In addition, even if the resin in the compression molded part stays in the high-temperature molding die for a long time, the amount of styrene contained in the resin is cross-linked to produce polystyrene having a low molecular weight. Since the amount can be reduced and the occurrence of voids in the joint portion can be suppressed, the strength reduction of the joint portion can be suppressed, and therefore, a molded motor with further high quality can be provided.

  In addition, since the molding shrinkage rate of the resin in the compression molded portion is reduced, the stress strain generated during molding and solidification can be reduced, so that the reduction in mechanical strength can be suppressed, and a mold motor that ensures even higher quality. Can provide.

  In addition, since air and generated gas contained in the resin of the injection molded part are dispersed around the compression molded part located at the flow end part and discharged from the gas discharge part, the resin density is increased in the bonded part. A reduction in the bonding strength can be suppressed, and a molded motor that can further ensure high quality can be provided.

  In addition, the air and generated gas contained in the resin in the compression molding part are compressed by the flow pressure of the resin in the injection molding part, and therefore are discharged from the gas discharge part located at the substantially central part of the compression molding part. A decrease in mechanical strength due to voids in the molded portion can be suppressed, and a molded motor that can ensure higher quality can be provided.

  According to the first aspect of the present invention, the stator core and the armature winding are integrally molded with a thermosetting resin, and the mold stator is rotatably disposed opposite to the mold stator. A mold motor composed of a rotor, wherein the mold stator is composed of an injection molded part and a compression molded part. The injection molded resin has a reduced flow pressure. It has the effect | action of couple | bonding with the resin of a compression molding part in the state where the fluid pressure before doing is high.

  The invention according to claim 2 of the present invention is a molded motor structure characterized in that the compression molding portion is located at the flow end, and the injection molded resin is before the flow pressure is lowered. It can be combined with the resin of the compression molding part located at the flow end while the flow pressure is high, and the air and generated gas contained in the resin of the injection molding part are around the compression molding part located at the flow end part. And the resin density is increased at the bonding portion.

  Invention of Claim 3 of this invention made it the structure of the mold motor characterized by making the hardening time of the thermosetting resin of the compression molding part longer than the hardening time of the thermosetting resin of the injection molding part. The action of combining with the injection-molded part before the resin surface of the compression-molded part is cured and before the release agent contained in the resin of the compression-molded part is lifted to the surface to cause a release action. Have.

  In the invention according to claim 4 of the present invention, the amount of the release agent contained in the thermosetting resin in the compression molded portion is less than the amount of the release agent contained in the thermosetting resin in the injection molded portion. The molding motor is characterized by the fact that the mold release agent contained in the resin in the compression molding part and the resin in the compression molding part and the injection molding before it emerges on the surface due to the heat of the mold. It has the effect | action that the resin of a part couple | bonds.

  In the invention according to claim 5 of the present invention, the glass fiber length contained in the thermosetting resin in the compression molded portion is shorter than the glass fiber length contained in the thermosetting resin in the injection molded portion. Since the glass fiber contained in the thermosetting resin of the injection molding part is broken by the rotation of the screw when measuring the molding machine, the glass motor of the compression molding part Since it becomes equal to the length, it has the effect that the molding shrinkage rate and the linear expansion coefficient of the compression molded portion and the injection molded portion are equal.

  The invention according to claim 6 of the present invention is a molded motor structure characterized in that the thermosetting resin in the compression molded part is softer than the thermosetting resin in the injection molded part. Since the resin in the part is further compressed by the flow pressure of the resin in the injection molded part, the amount of air discharged from the resin in the compression molded part increases from the beginning, and the generation of voids can be suppressed. This has the effect of increasing the resin density.

  In the invention according to claim 7 of the present invention, the particle size of the filler contained in the thermosetting resin in the compression molded portion is larger than the particle size of the filler contained in the thermosetting resin in the injection molded portion. Since the amount of the resin absorbed in the filler contained in the compression molding portion is reduced, the thermosetting resin in the compression molding portion is changed to the thermosetting resin in the injection molding portion. Compared to this, the gas becomes softer, and the gas contained in the compression molded part is more easily discharged due to the flow pressure of the resin in the injection molded part, and the resin density in the compression molded part increases.

  In the invention according to claim 8 of the present invention, the proportion of aluminum hydroxide in the filler contained in the thermosetting resin in the compression molded portion is the same as that of the aluminum hydroxide in the filler contained in the thermosetting resin in the injection molded portion. The ratio is less than the ratio, and the composition of the molded motor is characterized by the fact that the amount of resin absorbed in the filler contained in the compression-molded portion decreases, so the thermosetting resin in the compression-molded portion is the injection-molded portion. It becomes softer than the thermosetting resin, and the gas contained in the compression-molded part is more easily discharged by the flow pressure of the resin in the injection-molded part, so that the resin density in the compression-molded part is increased.

  The invention according to claim 9 of the present invention is characterized in that the amount of styrene monomer contained in the thermosetting resin in the compression-molded portion is less than the amount of styrene monomer contained in the thermosetting resin in the injection-molded portion. This is a mold motor configuration. Even if the resin in the compression molding part stays in the high-temperature molding die for a long time, the amount of styrene contained in it crosslinks to produce low molecular weight polystyrene. , It has the effect of reducing the amount of gas generated in the mold and suppressing the generation of voids in the joint.

  In the invention according to claim 10 of the present invention, the ratio of the low shrinkage agent contained in the thermosetting resin in the compression molded portion is larger than the proportion of the low shrinkage agent contained in the thermosetting resin in the injection molded portion. The molding motor has a characteristic configuration, and since the molding shrinkage rate of the resin in the compression molding portion is small, it has an effect of reducing stress strain generated during molding and solidification.

  According to an eleventh aspect of the present invention, there is provided a molding motor characterized in that a gas discharge portion is provided at a joint portion where the compression molding portion and the injection molding portion are joined. The air and the generated gas contained in are dispersed around the compression molded portion located at the flow end portion and discharged from the gas discharge portion, so that the resin density is increased at the bonded portion.

  The invention according to claim 12 of the present invention is a molded motor structure characterized in that a gas discharge portion is provided at a substantially central portion of the compression molded portion, and the air contained in the resin of the compression molded portion. Since the generated gas is compressed by the flow pressure of the resin in the injection-molded portion, it has an effect of being discharged from a gas discharge portion located at a substantially central portion of the compression-molded portion.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIGS. 1 to 4, 1 is a mold motor, 5 is a stator, and an insulator formed of an insulating material on a stator core 10 in which thin steel plates such as silicon steel plates having a plurality of slots are laminated. In this configuration, the armature winding 2 is wound through 6 and a printed circuit board 8 mounted with an electronic component 7 is attached. Reference numeral 11 denotes a bracket that holds the bearing 4. Reference numeral 3 denotes a magnet rotor formed by integrally orienting a plastic magnet with the shaft 9 while being polar-oriented during injection molding, and is rotatably disposed on the inner peripheral side of the stator core 10. The stator 5 is integrally molded with a thermosetting resin 12 to form a mold stator 5a. Thermosetting resin 12 is unsaturated polyester, aluminum hydroxide and calcium carbonate as filler, glass fiber as reinforcing material, high molecular weight polystyrene based low shrinkage agent that adjusts linear expansion coefficient and molding shrinkage rate, A mold release agent made of a metal soap such as calcium stearate which rises on the surface at the time of curing and improves mold release properties after molding, and a hardener made of peroxide are kneaded. The thermosetting resin 12 includes a thermosetting resin 12a that forms the compression-molded portion 14, and a thermosetting resin 12b that is injection-molded by a screw-type injection molding machine (not shown) to form the injection-molded portion 13. A jacket 18 is formed from the above. The compression-molded portion 14 is positioned at the flow end (including the weld portion) of the thermosetting resin 12b that flows by injection molding. The amount of the curing agent contained in the thermosetting resin 12a that forms the compression molded portion 14 is less than the amount of the curing agent contained in the thermosetting resin 12b that forms the injection molded portion 13, and heat The curing time of the curable resin 12b is long. Further, the amount of the release agent contained in the thermosetting resin 12a is smaller than the amount of the release agent contained in the thermosetting resin 12b (for example, 1.3 wt% and 2.0 wt%, respectively). %). Further, the glass fiber contained in the thermosetting resin 12a contains 3 wt% of 3.0 mm length and 3 wt% of 1.5 mm length, whereas it is contained in the thermosetting resin 12b. The glass fiber having a length of 3.0 mm is 6 wt%. Further, the thermosetting resin 12a has a kneading time after glass fiber addition of about 20 minutes in the production process, and the thermosetting resin 12b has about 15 minutes. The thermosetting resin 12a is thermoset. Softer than the resin 12b. The filler contained in the thermosetting resin 12a is about 45 wt% aluminum hydroxide having an average particle diameter of 7 to 8 μm, about 10 wt% aluminum hydroxide having an average particle diameter of 2 to 3 μm, and an average particle diameter of 7 It contains about 11 wt% of ˜8 μm calcium carbonate. On the other hand, the filler contained in the thermosetting resin 12b is about 46 wt% of aluminum hydroxide having an average particle diameter of 7 to 8 μm, about 13 wt% of aluminum hydroxide having an average particle diameter of 2 to 3 μm, and an average particle diameter of 7 About 6 wt% of calcium carbonate of ˜8 μm and about 2 wt% of calcium carbonate having an average particle diameter of 2 to 3 μm are contained. That is, the average particle diameter of the filler contained in the thermosetting resin 12a is larger than the average particle diameter of the filler contained in the thermosetting resin 12b, and is contained in the thermosetting resin 12a. The proportion of aluminum hydroxide is less than the proportion of aluminum hydroxide contained in the thermosetting resin 12b. Moreover, the styrene monomer contained in the thermosetting resin 12a is 9 wt%, the styrene monomer contained in the thermosetting resin 12b is 10 wt%, and the ratio of the styrene monomer contained in the thermosetting resin 12a is The ratio of the styrene monomer contained in the thermosetting resin 12b is smaller. Moreover, the ratio of the low shrinkage agent contained in the thermosetting resin 12a is larger than the proportion of the low shrinkage agent contained in the thermosetting resin 12b. Reference numeral 15 denotes a gas discharge portion, which is provided in the vicinity of the joint portion 19 between the compression molding portion 14 of the outer cover 18 and the injection molding portion 13 and in the vicinity of the substantially central portion 20 of the compression molding portion 14. The compression molding portion 14 has a thermosetting resin 12a placed in advance in a molding die 17 before injection molding, and after the stator 5 is placed, clamping of the molding die 17 and thermosetting resin 12b. It is formed by being compressed by the flow pressure of the resin due to the injection. And the glass fiber contained in the thermosetting resin 12b also has the glass fiber which breaks to the length of about 1.5 mm with the back pressure at the time of the measurement of a screw type injection molding machine.

  According to such a molded motor 1 of the present invention, the injected thermosetting resin 12b is combined with the thermosetting resin 12a of the compression-molded portion 14 while the fluid pressure before the fluid pressure is reduced is high. Therefore, it is possible to realize a molded motor 1 that can suppress a decrease in bond strength and ensure high quality without cracking at a resin bonding point.

  Further, since the compression-molded portion 14 is positioned at the flow end, the injected thermosetting resin 12b remains in a state in which the fluid pressure before the fluid pressure is reduced is high. Can be combined with. Further, air and generated gas contained in the thermosetting resin 12b of the injection molded portion 13 are dispersed around the compression molded portion 14 located at the flow end portion, and the resin density is increased at the bonded portion, so that the bonding strength is reduced. Can be suppressed. Therefore, it is possible to realize the molded motor 1 that ensures higher quality.

  Moreover, before the surface of the thermosetting resin 12a of the compression molding part 14 hardens | cures by extending the curing time of the thermosetting resin 12a of the compression molding part 14, the thermosetting resin injected with the thermosetting resin 12a. Since the binding resin 12b is bonded, a decrease in the bonding strength can be suppressed, and the molded motor 1 with high quality can be realized.

  Further, the amount of the release agent contained in the thermosetting resin 12a of the compression-molded portion 14 is less than the amount of the release agent contained in the thermosetting resin 12b of the injection-molded portion 13, so that the thermosetting Before the mold release agent contained in the curable resin 12a is raised on the surface by the heat of the molding die 17, the thermosetting resin 12a and the injected thermosetting resin 12b are combined. Therefore, it is possible to suppress the decrease in the bonding strength, and it is possible to realize the molded motor 1 that ensures higher quality.

  The glass fiber length contained in the thermosetting resin 12a of the compression-molded portion 14 is shorter than the glass fiber length contained in the thermosetting resin 12b of the injection-molded portion 13, thereby allowing screw-type injection molding. Since it is broken by the rotation of the screw at the time of machine weighing, it becomes equal to the length of the glass fiber of the compression molded portion 14. Therefore, the molding shrinkage ratio and the linear expansion coefficient of the compression molded portion 14 and the injection molded portion 13 are equal, the generation of cracks due to stress strain and thermal shrinkage can be suppressed, and a molded motor 1 with even higher quality can be realized. .

  In addition, the thermosetting resin 12a of the compression molded portion 14 is softer than the thermosetting resin 12b of the injection molded portion 13, and the thermosetting resin 12a is caused by the flow pressure of the injected thermosetting resin 12b. It is further compressed. Therefore, the air contained in the thermosetting resin 12a of the compression-molded portion 14 from the beginning is easily discharged to the outside of the molding die, the generation of voids can be suppressed, and the resin density of the compression-molded portion 14 is increased. Therefore, it is possible to suppress a decrease in the mechanical strength of the resin, and it is possible to realize the molded motor 1 that ensures higher quality.

  Further, the particle size of the filler contained in the thermosetting resin 12a of the compression molded portion 14 is larger than the particle size of the filler contained in the thermosetting resin 12b of the injection molded portion 13, so that thermosetting The resin absorption amount of the filler contained in the resin 12a is reduced. Therefore, the thermosetting resin 12a of the compression molded portion 14 becomes softer than the thermosetting resin 12b of the injection molded portion 13, and the thermosetting resin 12a is further compressed by the flow pressure of the injected thermosetting resin 12b. Will be. In the thermosetting resin 12a of the compressed compression molded portion 14, the air contained from the beginning is more easily discharged to the outside of the molding die 17, so that the resin density of the compression molded portion 14 is increased. Therefore, a reduction in the mechanical strength of the resin can be suppressed, and furthermore, a molded motor 1 that ensures high quality can be realized.

  Further, the proportion of aluminum hydroxide in the filler contained in the thermosetting resin 12a of the compression molded portion 14 was less than the proportion of aluminum hydroxide in the filler contained in the thermosetting resin 12b of the injection molded portion 13. Thereby, the resin absorption amount of the filler contained in the thermosetting resin 12a decreases. Therefore, the thermosetting resin 12a of the compression molded portion 14 becomes softer than the thermosetting resin 12b of the injection molded portion 13, and the thermosetting resin 12a is further compressed by the flow pressure of the injected thermosetting resin 12b. Will be. In the thermosetting resin 12a of the compressed compression molded portion 14, the air contained from the beginning is more easily discharged to the outside of the molding die 17, so that the resin density of the compression molded portion 14 is increased. Therefore, a reduction in the mechanical strength of the resin can be suppressed, and furthermore, a molded motor 1 that ensures high quality can be realized.

  In addition, the amount of styrene monomer contained in the thermosetting resin 12a of the compression molded portion 14 is less than the amount of styrene monomer contained in the thermosetting resin 12b of the injection molded portion 13, so that the thermosetting resin 12a has a high temperature. Even if it stays in the molding die 17 for a long time, the amount of styrene contained is crosslinked to produce polystyrene having a low molecular weight. Therefore, the amount of gas generated in the molding die 17 can be reduced, and the generation of voids in the joint portion can be suppressed. Therefore, since the strength reduction of the joint portion can be suppressed, the molded motor 1 that can secure higher quality can be realized.

  In addition, the ratio of the low shrinkage agent contained in the thermosetting resin 12a of the compression molding portion 14 is larger than the ratio of the low shrinkage agent contained in the thermosetting resin 12b of the injection molding portion 13, so that the compression molding portion The molding shrinkage ratio of the thermosetting resin 12a of 14 becomes small. Therefore, since stress strain generated during molding and solidification can be reduced, it is possible to suppress a decrease in mechanical strength. Accordingly, it is possible to realize a molded motor 1 that ensures high quality.

  Further, by providing the gas discharge portion 15 at the joint portion 19 between the compression molded portion 14 and the injection molded portion 13, air and generated gas contained in the thermosetting resin 12b of the injection molded portion 13 are flown to the flow end portion. While being distributed around the compression-molded portion 14 located, it is discharged from the gas discharge portion 15. Therefore, since the resin density is high in the joint portion 19, it is possible to suppress a reduction in the joint strength, and it is possible to realize the molded motor 1 that ensures higher quality.

  Further, by providing the gas discharge portion 15 in the vicinity of the substantially central portion 20 of the compression molded portion 14, air and generated gas contained in the thermosetting resin 12a of the compression molded portion 14 are injected into the injected thermosetting resin 12b. And is discharged from the gas discharge portion 15 located in the vicinity of the substantially central portion 20 of the compression molded portion 14. For this reason, it is possible to suppress a decrease in mechanical strength due to voids in the compression-molded portion 14, and it is possible to realize a molded motor 1 that ensures higher quality.

  In the first embodiment, the absolute value of each composition ratio of the thermosetting resin is an example, and may be determined as appropriate according to the required flame retardant grade, thermal conductivity, fluidity, and the like.

  In the first embodiment, the printed circuit board 8 is built in. However, the printed circuit board 8 may not be built in, and there is no difference in operation and effect.

  As described above, the molded motor according to the present invention is a ventilator, a water heater, which is an electrical device that is required to achieve downsizing, thinning, and weight reduction while ensuring high quality over a long period of time. Use in air conditioners such as air conditioners, air purifiers, dehumidifiers, dryers, and fan filter units is useful.

The perspective view which shows the mold motor in Embodiment 1 of this invention. Main part enlarged perspective view of the mold motor Cross section of the mold motor Sectional drawing which shows the state before the injection in mold molding of the mold motor Sectional view showing a conventional molded motor

DESCRIPTION OF SYMBOLS 1 Mold motor 2 Armature winding 3 Magnet rotor 4 Bearing 5 Stator 5a Mold stator 6 Insulator 7 Electronic component 8 Printed circuit board 9 Shaft 10 Stator core 11 Bracket 12 Thermosetting resin 13 Injection molding part 14 Compression molding part DESCRIPTION OF SYMBOLS 15 Gas exhaust part 16 Gate 17 Molding die 18 Jacket | cover 19 Coupling part 20 Approximate center

Claims (12)

A mold motor comprising a stator formed by integrally molding a stator core and an armature winding with a thermosetting resin, and a rotor arranged to be rotatable in opposition to the mold stator, The mold motor includes an injection molding portion and a compression molding portion. The molded motor according to claim 1, wherein the compression molding portion is positioned at a flow end. The mold motor according to claim 1 or 2, wherein a curing time of the thermosetting resin in the compression molding portion is longer than a curing time of the thermosetting resin in the injection molding portion. The amount of the mold release agent contained in the thermosetting resin of the compression molding portion is less than the amount of the mold release agent contained in the thermosetting resin of the injection molding portion. 4. The molded motor according to any one of 3. The length of the glass fiber contained in the thermosetting resin of the compression-molded portion is shorter than the length of the glass fiber contained in the thermosetting resin of the injection-molded portion. A molded motor according to claim 1. The mold motor according to claim 1, wherein the thermosetting resin in the compression molding portion is softer than the thermosetting resin in the injection molding portion. The particle size of the filler contained in the thermosetting resin of the compression molded portion is larger than the particle size of the filler contained in the thermosetting resin of the injection molded portion. The molded motor according to any one of the above. The proportion of aluminum hydroxide in the filler contained in the thermosetting resin in the compression-molded portion is less than the proportion of aluminum hydroxide in the filler contained in the thermosetting resin in the injection-molded portion. The molded motor according to claim 1. The amount of styrene monomer contained in the thermosetting resin of the compression-molded part is less than the amount of styrene monomer contained in the thermosetting resin of the injection-molded part. Molded motor. 10. The mold motor according to claim 9, wherein the ratio of the low shrinkage agent contained in the thermosetting resin in the compression molded portion is larger than the proportion of the low shrinkage agent contained in the thermosetting resin in the injection molded portion. . The molded motor according to any one of claims 1 to 10, wherein a gas discharge part is provided at a joint part where the compression molding part and the injection molding part are joined. The molded motor according to any one of claims 1 to 11, wherein a gas discharge portion is provided at a substantially central portion of the compression molding portion.

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