KR100389212B1 - Electric motor droven by using the capacitor in motor frame - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, wherein a dielectric of a capacitor is composed of a heat resistant film having a sum of thermal shrinkage in a longitudinal direction and a thermal shrinkage in a width direction of 4% or less at 120 ° C. It is characterized by being installed in the frame.

Description

A motor driven by the condenser housed in the motor frame {ELECTRIC MOTOR DROVEN BY USING THE CAPACITOR IN MOTOR FRAME}

The present invention relates to a motor (capacitor motor) to drive using a capacitor (capacitor).

For example, a condenser induction motor has been conventionally employed as a fan driving motor of a conduit ventilation fan. The motor houses a stator and a rotor inside a motor frame forming a cylindrical container, and attaches a capacitor to the outside of the motor frame. And the lead wire electrically connected to the winding wound by the iron core of the stator was taken out from the opening provided in the motor frame to connect with the condenser and the power line.

However, when the condenser is arranged outside the motor frame, the constitution as a whole of the motor is increased. Moreover, the lead wire which connects a winding and a capacitor becomes long, and wiring work becomes complicated.

For this reason, conventionally, there has been a demand for compactly storing a condenser in a motor frame together with a stator and a rotor.

However, when the capacitor is stored in the motor frame, the capacitor is susceptible to the influence of heat generated in each part of the motor when the motor is driven. Since a conventional capacitor has a low heat resistance temperature, there is a problem that a motor having a condenser housed within a motor frame can be applied only to a low output with a small amount of heat generated.

Accordingly, it is an object of the present invention to provide a motor capable of coping with a high output of large heat generation even when a capacitor is housed in a motor frame together with a stator and a rotor.

1 shows a first embodiment of the present invention, a longitudinal cross-sectional view showing the overall configuration of a motor;

2 is a plan view of a motor excluding the motor frame,

3 is a longitudinal cross-sectional view showing the configuration of the peripheral portion of the pin connection portion of the terminal block;

4 is a diagram showing an electrical connection relationship;

5 is a perspective view of a condenser element;

6 is an exploded view of the first and second films,

7 is a view showing an electrical configuration of a capacitor;

8 is a table showing evaluation results of the quality of a capacitor when a voltage 1.5 times the rated voltage is applied to the motor.

9 is a longitudinal sectional view of an upper half of a motor showing a second embodiment of the present invention;

10 is a longitudinal sectional view of a capacitor;

Fig. 11 is a correspondence of Fig. 9 showing a third embodiment of the present invention and

Fig. 12 shows a fourth embodiment of the present invention and shows a longitudinal cross-sectional view of a portion around a condenser in a motor.

* Explanation of symbols for the main parts of the drawings

2: motor frame 3a: upper frame

3b: lower frame 4: stator

5: stator iron core 6: winding

8: axis of rotation 9: rotor

10: bearing 12: terminal block

17: capacitor mounting portion 18: capacitor connection portion

19, 20, 21: pin connection 23: edge

24: condenser 29, 30: external connection terminal

36: first film 38: second film

51, 52: lead wire 53: capacitor mounting member

Claim 1 of the present invention is a motor comprising a driving capacitor and a stator and a rotor provided in a motor frame, wherein the dielectric shrinkage of the capacitor is equal to the heat shrinkage in the longitudinal direction and the heat shrinkage in the width direction at 120 ° C. It is comprised by the heat resistant film which is 4% or less, and has the said capacitor installed in the said motor frame.

According to the said structure, since the film which comprises a dielectric material has a small thermal contraction rate and it is hard to wrinkle in high temperature, a capacitor becomes excellent in heat resistance. For this reason, even if a high output motor has a high heat generation amount, the capacitor can be provided in the motor frame.

In this case, the heat resistant film is preferably composed of at least one of a polypropylene (PP) film, a polyphenylene sulfide (PPS) film, and a polyethylene naphthalate (PEN) film having excellent heat resistance.

Moreover, the said capacitor | condenser is comprised including the cylindrical element comprised by winding up one set of heat resistant films in which the vapor deposition electrode was provided, and the terminal connection electrode is provided in the both ends of the said element, and at least among the heat resistant films What is necessary is just to comprise the vapor deposition electrode provided in one with many independent electrode parts.

According to the above configuration, even if the deposition electrode is destroyed, for example, in the deposition electrode composed of a plurality of electrode portions, each electrode portion is destroyed in sequence. For this reason, compared with the case where a vapor deposition electrode is destroyed once, breaking energy can be made small and it is excellent in safety.

The element of the capacitor may be impregnated with a wax-type impregnating agent having a softening temperature of about 100 to 125 ° C. According to such a structure, the impregnating agent does not melt | dissolve from an element even at high temperature, and can maintain the insulation performance between vapor deposition electrodes. In addition, there is an effect that can prevent the breakdown of the electrode by corona discharge or the like generated at the time of photovoltage.

The capacitor is preferably connected to the winding of the stator in the motor frame. In particular, when the terminal block or the wiring board is provided in the motor frame, the capacitor may be installed in the terminal block or the wiring board. According to the said structure, the connection effect | action of a capacitor | condenser and a winding becomes easy.

In addition, the capacitor is preferably integrally attached to the terminal block or the wiring board in a state covered by the potting material. In this case, the connecting portion of the winding of the capacitor and the stator may be covered by the potting material. According to the above configuration, intrusion of moisture into the condenser can be reliably prevented.

Embodiment of the Invention

Hereinafter, a first embodiment in which the present invention is applied to a condenser induction motor for fan driving of a conduit ventilation fan will be described with reference to FIGS. 1 to 8.

First, FIG. 1 is a figure which shows the whole structure of the motor 1 which concerns on a present Example. In this FIG. 1, the motor frame 2 which forms the cylindrical container shape is comprised by combining the upper frame 3a and the lower frame 3b.

The stator 4 and the rotor 9 are housed in the motor frame 2. The stator 4 includes a plurality of stator iron cores 5 formed in an annular shape fixed to the inner surface of the circumferential wall of the motor frame 2 and a plurality of stator iron cores 5 mounted through insulating members (not shown). It consists of a winding 6. The winding 6 consists of a main winding 6a and an auxiliary winding 6b (both shown only in FIG. 4). The rotor 9 is provided at a predetermined interval between the stator cores 5 at an inner circumference of the stator iron core 5. The rotating shaft 8 of the rotor 9 is rotatably supported by bearings 10 provided in the upper and lower frames 3a and 3b, respectively.

The lower end of the rotating shaft 8 protrudes downward from the lower frame 3b, and a fan (not shown) is attached to the distal end as a load. Moreover, the opening part 11 is formed in the circumferential wall part of the upper frame 3a located in the half load side of the said frame 3.

The terminal block 12 is provided in the half load side part inside the said motor frame 2. As shown in FIG. 2, the terminal block 12 has a substantially circular shape corresponding to the fixed iron core 5, and the inserts 13a, 13b, and 13c made of metal plates are formed by insulating resin. It is comprised by doing. The engaging portion 15 is integrally formed on the opposing surface of the stator 4 of the terminal block 12. In addition, the engaging portion 16 is provided on the insulating member of the stator 4. The terminal block 12 is attached to the stator 4 by engaging the engaging portion 15 with the engaging portion 16.

As shown in Fig. 2, the terminal block 12 has one capacitor mounting portion 17, two capacitor connecting portions 18 and three pin connecting portions 19 to 21 disposed in the vicinity of the capacitor mounting portion 17. ) And one connector portion 22 are provided. The capacitor connecting portion 18 is formed by exposing one end of the conductor 13a, 13b to the surface of the terminal block 12, respectively. The pin connecting portion 19 is formed by exposing the middle portion of the conductor 13a to the surface of the terminal block 12. The pin connecting portions 20 and 21 are formed by exposing the ends of the conductors 13b and 13c to the surface of the terminal block 12, respectively.

The capacitor mounting portion 17 and the capacitor connecting portion 18 are surrounded by an edge 23 formed integrally with the terminal block 12. The capacitor 24 is accommodated in the portion corresponding to the capacitor mounting portion 17 inside the edge portion 23. The pair of terminals 25a and 25b of the capacitor 24 are electrically connected to the capacitor connecting portion 18 by soldering or spot welding, respectively.

In the edge portion 23, a potting material 26 made of synthetic resin, for example epoxy resin, covers the entirety of the condenser 24, the terminals 25a and 25b, and the condenser connecting portion 18. It is charged.

As a result, the capacitor 24 is integrally attached to the terminal block 12. As shown in FIG. 1, the condenser 24 is disposed in the motor frame 2 so as to face the winding 6 in the axial direction while being separated from the winding 6.

The connector portion 22 is disposed at a portion corresponding to the opening 11 of the motor frame 2. The connector portion 22 is composed of a housing 28 opened toward the opening 11, and the external connection terminals 29 and 30, which are ends of the conductors 13a and 13c, are formed in the housing 28. It is installed.

As shown in Fig. 3, pin insertion holes 31 are formed in the pin connecting portions 19 to 21, respectively. When the terminal block 12 is attached to the stator 4, the pin insertion hole 31 is provided with a pin 33 provided in the pin holding portion 32 of the insulating member. The end of the winding 6 is wound around the pin 33 and electrically connected to the pin 33. Then, the windings 6 and the connecting portions 19 to 21 are connected by electrically connecting the pin 33 and the connecting portions 19 to 21 with the solder 34.

In addition, as shown in FIG. 4, in this embodiment, both ends of the main winding 6a of the winding 6 are connected to the pin connecting portion 19 and the pin connecting portion 21, respectively, of the auxiliary winding 6b. Both ends are connected to the pin connection part 20 and the pin connection part 21, respectively.

Subsequently, the capacitor 24 will be described with reference to FIGS. 5 to 7 mainly. The capacitor 24 is a so-called plastic film capacitor, and as shown in Fig. 5, an element constituted by overlapping the first and second films 36 and 38 that form a band as a dielectric ( 40). In this case, the capacitor | condenser 24 is accommodated in the said capacitor | condenser mounting part 17 by making the element 40 formed by winding the 1st and 2nd films 36 and 38 in cylindrical shape in flat shape (refer FIG. 1). . In the present embodiment, the first and second films 36 and 38 are each made of a polypropylene (PP) film having heat resistance. The characteristic of the said 1st and 2nd film 36 and 38 is mentioned later.

As illustrated in FIG. 6, a first deposition electrode 35 is provided on one surface of the first film 36. In this case, a non-deposition portion 36a in which the first deposition electrode 35 is not formed is provided at one edge portion of the first film 36. The first deposition electrode 35 is provided continuously in the longitudinal direction of the first film 36. On the other hand, the second deposition electrode 37 is provided on one side of the second film 38. In this case, the non-deposition portion 38a in which the second deposition electrode 37 is not formed is provided at the other edge portion of the second film 38. In addition, the second deposition electrode 37 is composed of a plurality of electrodes (b1, b2, ... bn) provided in a state separated in the longitudinal direction of the second film 38.

The element 40 is impregnated with a wax-type impregnating agent having a softening temperature of about 100 to 125 ° C. This is to improve the insulation of the capacitor 24. 5, the terminal connection electrode 41 formed by injecting zinc is provided in the both ends of the width direction (axial direction) of the said element 40. As shown in FIG. The terminals 25a and 25b of the capacitor 24 are connected to these two terminal connecting electrodes 41.

As described above, since the non-deposition portion 36a is provided at one edge portion of the first film 36, the terminal connection electrode 41 is formed at the other edge portion of the first film 36. It is electrically connected to the first deposition electrode 35.

Further, since the non-deposition portion 38a is provided at the other edge portion of the second film 38, the terminal connection electrode 41 is deposited on the second edge portion at one edge portion of the first film 38. It is electrically connected to the electrode 37 (electrodes b1, b2, ... bn). In addition, the structure of the said capacitor | condenser 24 is shown schematically in FIG.

When using the motor 1 of the said structure, the external connector which is not shown in which the power supply line was connected is fitted to the connector part 22 of the said terminal block 12 via the opening part 11 of the said motor frame 2. At this time, the two connection terminals of the external connector are connected to the external connection terminals 29 and 30 of the connector portion 22.

In the present embodiment, the insulation class of the motor 1 is set to class B insulation (the maximum allowable temperature of the winding 6 is 120 ° C).

In general, when heat of about 120 ° C. is applied to the condenser of the above configuration, the film constituting the dielectric contracts in the longitudinal direction and the width direction, causing partial swelling or dent, and the flat element deforms into a cylindrical shape. The degree of deformation of such an element depends on the magnitude of the thermal shrinkage of the film. For this reason, depending on the magnitude of thermal contraction rate, the potting material which covers a capacitor | condenser cannot respond to a deformation | transformation of an element, a crack and a crack generate | occur | produce in a potting material, and there exists a possibility that water resistance may fall.

In addition, when the first and second films shrink in the width direction, the terminal connection electrode may peel off from the first and second deposition electrodes, which may lower the capacity of the capacitor. In addition, when the first and second films shrink, an error may occur between the first and second deposition electrodes or wrinkles may occur in the first and second films, resulting in pinholes or spaces, which may lower insulation. When the above-mentioned phenomena such as element deformation, cracking of the potting material, insulation deterioration, and change in capacitor capacity occur, the quality of the capacitor deteriorates.

Therefore, in this embodiment, in order to prevent the deterioration of the quality of the capacitor as much as possible, the sum of the heat shrinkage in the longitudinal direction and the heat shrinkage in the width direction when the first and second films 36 and 38 are heated at 120 ° C. for 15 minutes. The film is made up of 4% or less, preferably 3% or less. Therefore, the thermal contraction rate of a film is computed by the method shown below.

First, the sample for thermal contraction rate calculation of a longitudinal direction, and the thermal contraction rate calculation of a width direction is created from the target film. These samples are 260mm long and 10mm wide, respectively. Then, marks are placed at 30 mm from both ends in the longitudinal direction of the sample. Therefore, the length L0 from one mark to the other mark is 200 mm.

Subsequently, while keeping the sample in the vertical direction, the lower end was applied with a load of 3 g and suspended in an oven at 120 ° C. for 15 minutes. Then, the sample is taken out of the oven, the length L1 between both marks is measured, and the thermal contraction rate of each sample is calculated by the following equation.

Thermal Shrinkage = [(L0-L1) / L0] × 100 (%)

Then, by combining the heat shrinkage rate calculated for the heat shrinkage rate calculation sample in the longitudinal direction and the heat shrinkage rate calculated for the heat shrinkage rate calculation sample in the width direction, the heat shrinkage rate in the longitudinal direction of the film and the heat shrinkage rate in the width direction are combined. It is sum.

The basis for setting the sum of the heat shrinkage in the longitudinal direction of the film and the heat shrinkage in the width direction to be 4% or less, preferably 3% or less is as follows. That is, FIG. 8 shows a voltage of 1.5 times the rated voltage for 30 minutes in an atmosphere of 120 ° C. for a motor having a condenser composed of a film having a sum of thermal shrinkages of 2%, 3%, 4%, and 5%. The quality evaluation result of the capacitor | condenser according to each phenomenon ("element deformation", "cracking", (cracking or cracking of a potting material), "degradation of insulation", "change in capacitor capacity") which generate | occur | produces when applied is shown. Here, "(circle)" is good, "(triangle | delta)" develops, but there is no problem, and "x" has shown that quality fell. In addition, the evaluation of the "splitting" of the film whose total heat shrinkage in the longitudinal direction and the width direction is 5% is "Δ-x" when the cracking occurs in the potting material (△) and when the potting material is cracked ( ×) because there is.

As apparent from Fig. 8, in the capacitor | condenser which employ | adopted the film whose sum of the thermal contraction rate of the longitudinal direction and the width direction is 5%, evaluation is low for all the items, and it turns out that the quality of a capacitor | condenser falls. In addition, in the capacitor which employs a film whose total heat shrinkage in the longitudinal direction and the width direction is 4%, the items of "strain deformation", "insulation deterioration", and "capacity change" are "no problem", and are "divided." Evaluation for "good" was. And evaluation of all the items of the capacitor | condenser which employ | adopted the film whose sum of the thermal contraction rate of a longitudinal direction and the width direction is 3% or 2% was "good".

Therefore, in the present Example, the 1st and 2nd films 36 and 38 were comprised using the PP film whose sum of the thermal contraction rates of a longitudinal direction and a width direction is 4% or less, Preferably it is 3% or less.

According to this embodiment of the above structure, the following effects can be obtained.

First, since the first and second films 36 and 38 are made of a film having a low thermal contraction rate and are hard to wrinkle at high temperatures, the quality of the capacitor 24 is stable even at a high temperature, and thus the heat resistance temperature of the capacitor 24 is increased. Can increase. For this reason, the said capacitor | condenser 24 can be accommodated in the motor frame 2 even in the said motor 1 of many heat generation and high output.

In the motor 1, since the condenser 24 is housed in the motor frame 2, it is not necessary to secure a space for disposing the condenser outside the motor frame 2. In the present embodiment, when the condenser 24 is disposed on the terminal block 12, the condenser 24 and the windings 6 of the stator 4 are connected so that the condenser 24 is connected to the windings of the stator from the outside of the motor frame. Unlike the conventional motor, the connection work of the condenser 24 and the winding 6 is simplified.

In the present embodiment, the second deposition electrode 37 of the capacitor 24 is composed of a plurality of independent electrodes b1, b2... Therefore, when the second deposition electrode 37 is destroyed, for example, each electrode b1, b2... Is destroyed one by one. For this reason, compared with the case where the said 2nd deposition electrode 37 is destroyed once, destruction energy can be made small and it can be set as excellent security.

Moreover, the element type 40 of the said capacitor | condenser 24 was impregnated with the wax type impregnating agent whose softening temperature is about 100-125 degreeC. For this reason, the impregnating agent does not easily flow out of the element 40 even at a high temperature, so that the insulating performance between the first and second deposition electrodes 35 and 37 can be maintained. In addition, breakdown of the electrode due to corona discharge or the like generated at high voltage can be prevented.

In the present embodiment, the condenser 24 is disposed at a position corresponding to the winding 6 inside the motor frame 2. For this reason, the positional relationship of the capacitor | condenser 24 and the winding 6 can be made constant, and the temperature conditions of the capacitor | condenser 24 can be made constant. In addition, the condenser 24 is separated from the winding 6 so that the condenser 24 is hardly affected by the heat generated in the winding 6. Therefore, also in this respect, the motor 1 can cope with class B insulation with high insulation class.

The capacitor 24 was integrally attached to the terminal block 12 so as to be covered with the potting material 26. For this reason, even if the said capacitor | condenser 24 is attached to the said terminal block 12 as it is, the element 40 can ensure the quality equivalent to the normal capacitor comprised by accommodating an element in a case. That is, since the capacitor | condenser 24 can make a case unnecessary, the cost can be reduced by that much.

The terminals 25a and 25b and the condenser connecting portion 18 of the condenser 24 were also covered with the potting material 26. For this reason, invasion of moisture to the condenser 24 can be reliably prevented, and the reliability of the condenser 24 is further improved.

In addition, the condenser 24 is installed in the half-load side of the motor frame 2, and the connector 22 of the terminal block 12 is connected to the power supply line through the opening 11 of the motor frame 2. I made it. For this reason, the said power supply line does not interfere with rotation of the fan attached to the rotating shaft 8 as a load.

Moreover, since the connector part 22 which faces the opening part 11 of the motor frame 2 was provided in the terminal block 12, the said capacitor | condenser 24 is fitted by fitting the connector part connected with the power supply line to the said connector part 22. ) And power line can be connected easily.

9 and 10 show a second embodiment of the present invention and explain the differences from the first embodiment. In addition, the same code | symbol is attached | subjected to the same part as 1st Example.

That is, as shown in FIG. 9, the terminal block 48 is provided in place of the terminal block 12 in the half load side part inside the motor frame 2. The capacitor 45 is fixed to the lower surface of the terminal block 48. In this case, the condenser 45 is separated from the winding 6 and is provided at a portion located in the radially inner side of the winding 6.

As shown in FIG. 10, the condenser 45 is filled with a potting material 47 made of, for example, an epoxy resin covering the device 40 and the device 40 in a case 46. have.

In this second embodiment, since the condenser 45 is disposed in an open portion in the radially inner side of the winding 6 inside the motor frame 2, the condenser 45 is accommodated in the motor frame 2. As a result, the motor frame 2 can be suppressed from becoming larger in the axial direction.

Fig. 11 shows a third embodiment of the present invention, which is different from the second embodiment. In addition, the same code | symbol is attached | subjected to the same part as 2nd Example.

This third embodiment is applied to a motor corresponding to class A insulation (the maximum allowable temperature of the winding 6 is 100 ° C). That is, in this embodiment, the condenser 45 is fixed to the upper part of the winding 6 via the fixed yarn 50, without providing the terminal block 48 in the motor frame 2.

Therefore, in this embodiment, the condenser 45 is in contact with the winding 6. However, since the motor 1 of this embodiment corresponds to class A insulation, there is no problem.

In this case, one end of the main winding 6a and the lead wire 51 are connected to one terminal 25a of the condenser 45, and one end of the auxiliary winding 6b is connected to the other terminal 25b. It is. Although not shown in detail, a lead wire 52 is connected to the other end of the main winding 6a and the other end of the auxiliary winding 6b. These lead wires 51 and 52 are led to the outside of the motor frame 2 from the opening 11 of the motor frame 2 and are connected to a power line not shown.

12 shows a fourth embodiment of the present invention, which differs from the third embodiment in the following points.

That is, the condenser 45 is disposed above the stator 4 via the condenser mounting member 53. In this case, the space of distance D is formed between the condenser 45 and the winding 6. According to such a structure, since the condenser 45 becomes less susceptible to the heat generated from the windings 6, the motor 1 can be applied to an insulation class having a high maximum allowable temperature.

In addition, this invention is not limited only to each above-mentioned embodiment, For example, the following deformation | transformation or expansion is possible.

The 1st and 2nd films 36 and 38 are not limited to a heat resistant PP film, You may comprise with a polyphenylene sulfide (PPS) film or a polyethylene naphthalate (PEN) film. In addition, the PP film, the PPS film, or the PEN film may be appropriately combined in consideration of dielectric constant, heat shrinkage rate, or self-heating. In summary, the film may be distinguished and used according to the use of the motor.

The capacitor may be provided on the wiring board in place of the terminal block.

Instead of providing the connector portion in the terminal block, a member (SL terminal) for holding a power supply wire (for example, a VVF cable) may be provided. In this case, the SL terminal may be integrally formed with the terminal block or may be a different part from the terminal block.

According to such a structure, a power supply wire can be directly connected to a terminal block, and motor installation work can be performed easily.

Claims (34)

In a motor provided with a driving condenser and provided with a stator and a rotor in a motor frame, The dielectric of the said capacitor is comprised by the heat resistant film whose sum of the thermal contraction rate of a longitudinal direction and the thermal contraction rate of a width direction is 4% or less at 120 degreeC, and the said capacitor | condenser was installed in the said motor frame. The method of claim 1, And wherein the heat resistant film comprises at least one of polypropylene film, polyphenylene sulfide film and polyethylene naphthalate film. The method according to claim 1 or 2, The condenser includes a cylindrical element constituted by wrapping a set of heat resistant films provided with a deposition electrode, Terminals are provided at both ends of the device for connecting terminals, The deposition electrode provided on one of the heat-resistant film is characterized in that the motor is composed of a plurality of independent electrode. The method according to claim 1 or 2, And a wax-type impregnating agent having a softening temperature of 100 to 125 캜 is impregnated in the element of the capacitor. The method of claim 3, wherein And a wax-type impregnating agent having a softening temperature of 100 to 125 ° C. The method according to claim 1 or 2, And the condenser is provided away from a winding of the stator so as to correspond to an insulation class of class A insulation or higher. The method of claim 3, wherein And the condenser is provided away from a winding of the stator so as to correspond to an insulation class of class A insulation or higher. The method of claim 4, wherein And the condenser is provided away from a winding of the stator so as to correspond to an insulation class of class A insulation or higher. The method of claim 5, And the condenser is provided away from a winding of the stator so as to correspond to an insulation class of class A insulation or higher. The method according to claim 1 or 2, A motor configured to correspond to class A insulation, wherein the capacitor is provided in contact with a winding of the stator. The method of claim 3, wherein A motor configured to correspond to class A insulation, wherein the capacitor is provided in contact with a winding of the stator. The method of claim 4, wherein A motor configured to correspond to class A insulation, wherein the capacitor is provided in contact with a winding of the stator. The method of claim 5, A motor configured to correspond to class A insulation, wherein the capacitor is provided in contact with a winding of the stator. The method according to claim 1 or 2, And the condenser is connected to a winding of the stator in the motor frame. The method of claim 6, And the condenser is connected to a winding of the stator in the motor frame. The method of claim 10, And the condenser is connected to a winding of the stator in the motor frame. The method of claim 14, A terminal block or a wiring board is installed in the motor frame. And the capacitor is mounted on the terminal block or the wiring board. The method of claim 15, A terminal block or a wiring board is installed in the motor frame. And the capacitor is mounted on the terminal block or the wiring board. The method of claim 16, A terminal block or a wiring board is installed in the motor frame. And the capacitor is mounted on the terminal block or the wiring board. The method of claim 17, And the capacitor is covered by the potting material and integrally attached to the terminal block or the wiring board. The method of claim 18, And the capacitor is covered by the potting material and integrally attached to the terminal block or the wiring board. The method of claim 19, And the capacitor is covered by the potting material and integrally attached to the terminal block or the wiring board. The method of claim 20, A connecting portion of the windings of the condenser and the stator is covered with the potting material. The method of claim 21, And the connecting portion of the winding of the condenser and the stator is covered by the potting material. The method of claim 22, And the connecting portion of the winding of the condenser and the stator is covered by the potting material. The method of claim 14, And the condenser is provided at a portion facing in the axial direction with the winding of the stator. The method of claim 15, And the condenser is provided at a portion facing in the axial direction with the winding of the stator. The method of claim 16, And the condenser is provided at a portion of the stator opposite the winding of the stator. The method of claim 14, The condenser is provided in the radially inner side than the winding of the stator. The method of claim 15, The condenser is provided in the radially inner side than the winding of the stator. The method of claim 16, The condenser is provided in the radially inner side than the winding of the stator. The method of claim 14, And the condenser is provided at a half load side portion inside the motor frame. The method of claim 15, And the condenser is provided at a half load side portion inside the motor frame. The method of claim 16, And the condenser is provided at a half load side portion inside the motor frame.