JP6936664B2 - Motor and pump equipment - Google Patents

Description

The present invention relates to a motor and a pump device.

In recent years, there has been an increasing momentum for the use of renewable energy as an alternative to fossil fuels and nuclear power. In Japan, which reserves a large amount of geothermal energy, technological development of geothermal energy utilization is very important. Regarding the use of geothermal heat, specifically the use of high-temperature underground water, there are many restrictions associated with the use because many large-scale heat sources exist deep underground in national parks. In addition, it is not often used because the impact on the surrounding hot spring facilities is immeasurable when it is used.

Therefore, in recent years, the development of low temperature difference power generation using existing hot spring water has become active. Except when hot spring water is self-spraying, a submersible motor pump that can withstand high temperatures is required to pump high-temperature well water. As a motor used for a pump that pumps high-temperature well water at 70 ° C. to 80 ° C., for example, a submerged canned motor disclosed in Patent Document 1 and Patent Document 2 is known.

Jikkai Sho 59-122752 Jikkai Sho 59-122753

However, in order to increase the amount of power generation, it is preferable to use a higher temperature, for example, high temperature well water of about 80 ° C. to 100 ° C. This is because if the water temperature is lower than this, the amount of power generation is small, and if it exceeds 100 ° C., scale easily adheres to the well or equipment, and maintenance is troublesome. In addition, until now, relatively small-scale pumps have been used only for the purpose of pumping hot springs, but when the main purpose is power generation, the power generation equipment is not profitable unless there is a predetermined amount of pumped water. Therefore, a large-sized (about 30 to 300 kW) submersible motor having a larger output than the conventional one (22 kW or less) is required.

Conventionally, a motor with a canned structure that cannot be rewound and repaired has been used for a relatively low output high temperature submersible motor, and the filling liquid sealed inside this motor is oil that does not boil even when the liquid temperature rises above 100 ° C. Has been used. However, when using a large motor (in this specification, 30 kW or more and 300 kW or less is referred to as a large motor), a water resistant electric wire type submersible motor that can be rewound and repaired is desirable so that it can be used for a long period of time. .. Further, as the size of the motor increases, the amount of heat generated by the motor also increases, so that the heat resistance of the motor becomes a problem when pumping high-temperature well water near 100 ° C. Therefore, there is a demand for a large-sized submersible motor that can withstand the pumping of high-temperature well water of about 100 ° C.

Further, in such a large motor, since the amount of the filling liquid is relatively large, it is necessary to pay more attention to the influence on the environment if the filling liquid leaks to the outside of the motor.

The present invention has been made in view of at least one of the above problems. One of the purposes is to provide a motor suitable for a pump that pumps hot water of about 80 ° C. to 100 ° C.

According to the first aspect, a motor in which the filling liquid is sealed is provided. This motor encloses the encapsulating liquid, and has a casing configured to block external fluid from entering the inside, a rotor that rotates in the casing, and an outer peripheral side of the rotor in the casing. Has a stator, which is arranged in. The stator is mainly composed of a conductor, an amidimide resin enamel that covers the outer peripheral surface of the conductor, and a perfluoroalkoxy alkane resin or a tetrafluorinated ethylene hexafluoride propylene copolymer that covers the outer peripheral surface of the amidimide resin enamel. It has an insulator and a winding having.

According to the second form, in the motor of the first form, the encapsulating liquid is propylene glycol having a concentration of 97% by mass or more.

According to the third aspect, in the motor of the first or second form, a storage chamber that communicates with the internal space of the casing and is configured to accept the filling liquid, the storage chamber, and the outside of the motor. , A first urging member that urges the diaphragm in a direction that reduces the space of the storage chamber, and a diaphragm that urges the diaphragm in a direction that increases the space of the storage chamber. It has a second urging member. The first urging member and the second urging member are configured to balance each other at room temperature to maintain the volume of the storage chamber at a predetermined volume.

According to the fourth aspect, in the motor of the third form, the storage chamber wall portion that defines the storage chamber is provided together with the diaphragm, and the second urging member is between the storage chamber wall portion and the diaphragm. A gap is formed between the storage chamber wall portion and the diaphragm.

According to the fifth aspect, in any of the first to fourth forms of the motor, the winding is configured to be rewound with respect to the stator.

According to the sixth embodiment, a pump device is provided. This pump device includes any of the motors of the first to fifth forms and a pump connected to the output shaft of the motor.

It is a figure which shows the appearance of the pump device of this embodiment. It is a figure which shows the cross section of the motor of this embodiment. The cross-sectional view of one winding of a stator coil wound around a stator core is shown. It is a graph which shows the boiling point with respect to the concentration of propylene glycol. It is a graph which shows the viscosity with respect to the concentration of propylene glycol. It is an enlarged cross-sectional view of the antiload side of a motor. It is sectional drawing which shows an example of the behavior of a diaphragm when a motor does not have a 2nd urging member.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings described below, the same or corresponding components are designated by the same reference numerals and duplicate description will be omitted. FIG. 1 is a diagram showing the appearance of the pump device of the present embodiment. The pump device according to the present embodiment is configured to be able to pump hot water at 100 ° C. As shown in FIG. 1, the pump device 500 includes a motor 100 in which a filling liquid is sealed and a submersible pump 200 connected to the motor 100.

The submersible pump 200 has a drive shaft 202 connected to the output shaft 110 of the motor 100, and a plurality of blades 204 attached to the drive shaft 202. The submersible pump 200
The drive shaft 202 and the blades 204 rotate with the rotational drive of the output shaft 110 of the motor 100, thereby pumping water.

Next, the details of the motor 100 of this embodiment will be described. FIG. 2 is a diagram showing a cross section of the motor 100 of the present embodiment. The motor 100 is installed in a high temperature liquid to pump a high temperature liquid such as hot spring water. As shown in FIG. 2, the motor 100 includes a casing 101. The casing 101 has a cylindrical frame 102, a first frame side plate 120, and a second frame side plate 130. Further, the motor 100 includes a stator (stator) 104 fixed in the frame 102, a rotor (rotor) 107 provided inside the stator 104, and an output shaft 110 attached to the rotor 107.

The stator 104 includes a stator core 105 formed by laminating electromagnetic steel plates, and a stator coil 106 (corresponding to an example of winding) wound around the stator core 105. The stator coil 106, cable 1 12 for energizing the stator coil 106 is connected. The rotor 107 has a rotor core 108 formed by laminating electromagnetic steel sheets, and a secondary conductor 109 arranged on the rotor core 108. In the present embodiment, rotor core 108 has a slot (not shown) extending in the axial direction of the output shaft 110, a conductive material such as aluminum alloy or copper alloy is inserted into the slot, the secondary conductors 109 It is formed. In the motor 100, the rotor 107 rotates in the frame 102 due to electromagnetic induction generated by a rotating magnetic field generated by energization of the stator coil 106, and the output shaft 110 also rotates as the rotor 107 rotates.

The first frame side plate 120 is provided so as to cover the end portion (the end portion on the counterload side) of the frame 102 on the side to which the submersible pump 200 is not connected. Specifically, the first frame side plate 120 is fixed to the end of the frame 102 by welding or the like, and the counterload side bracket 122 is fixed to the first frame side plate 120 by bolts 184. On the other hand, the second frame side plate 130 is provided so as to cover the end portion (load side end portion) of the frame 102 on the side to which the submersible pump 200 is connected. Specifically, the second frame side plate 130 is fixed to the end of the frame 102 by welding or the like , and the load side bracket 131 is fixed to the second frame side plate 130 by bolts 194.

A filling liquid 114 is sealed inside the casing 101 in order to cool the heat generated from the stator 104, the rotor 107, and the like, and to improve the slidability of the output shaft 110. The casing 101 is configured to prevent the filling liquid 114 from being discharged to the outside of the motor 100 and to block external fluid from entering the casing 101.

In the case of a general canned motor, since the can is welded to the casing, the stator coil cannot be replaced (rewound). On the other hand, as shown in FIG. 2, the motor 100 according to the present embodiment does not have a canned structure, and the space in which the rotor 107 is arranged and the space in which the stator 104 is arranged are integrated. Therefore, when the stator coil 106 deteriorates over time due to the use of the motor 100 for a long period of time, the stator coil 106 can be removed from the stator core 105 and rewound with a new stator coil 106.

A diaphragm (pressure fluctuation absorbing mechanism) 182 that absorbs pressure fluctuations in the casing 101 is provided on the counterload side of the motor 100. The diaphragm 182 absorbs the pressure fluctuation between the inside of the casing 101 and the outside of the motor 100 by displacing the film according to the pressure fluctuation in the casing 101. The diaphragm 182 has a predetermined volume (pressure difference) in consideration of the rating of the motor 100, the depth and temperature of the underground water in which the motor 100 is installed (for example, 80 ° C. to 100 ° C., etc.), a margin, and the like. Anything that can absorb the above can be used.

A radial bearing 188 and a thrust bearing 190 for axially supporting the output shaft 110 are provided on the counterload side of the motor 100. On the other hand, the load side of the motor 100, the radial bearing 198 for rotatably supporting the output shaft 110 is provided.

A through hole 132 through which the output shaft 110 can penetrate is formed in the central portion of the second frame side plate 130 in order to project the tip of the output shaft 110 to the outside of the motor 100. The output shaft 110 projects to the outside of the motor 100 through the through hole 132 and is connected to the drive shaft 202 (see FIG. 1) of the submersible pump 200.

The through hole 132 is provided with a shaft sealing mechanism 150 that prevents the filling liquid 114 from leaking to the outside and water or the like outside the motor 100 from entering the inside of the motor 100. In the present embodiment, the shaft sealing mechanism 150 includes, for example, a mechanical seal , an oil seal, a sand slinger, and the like.

FIG. 3 shows a cross-sectional view of one winding of the stator coil 106 wound around the stator core 105. As described above, the pump device 500 according to the present embodiment is configured to be able to pump hot water at 100 ° C. Here, when the hot water is pumped up, the temperature rises due to the heat generated by the stator coil 106 itself, and as a result, the temperature of the filling liquid 114 in contact with the stator coil 106 also rises. The filling liquid 114 and the stator coil 106 are cooled by the pumped liquid. However, when hot water of about 100 ° C. is pumped up, the encapsulating liquid 114 and the stator coil 106 are cooled by the relatively high temperature hot water. Therefore, for example, the encapsulating liquid 114 is set to about 140 ° C. to 150 ° C. The coil 106 can be heated to about 180 ° C. It is generally known that cross-linked polyethylene is used as the insulating coating material for the stator coil, and the heat resistant temperature is about 90 ° C. Since the stator coil 106 is in contact with the filling liquid 114 (propylene glycol), its outer surface needs to be reliably insulated. However, when the insulating coating material is cross-linked polyethylene, the heat resistance is insufficient and the insulating property is poor. It may be hindered.

Therefore, in the stator coil 106 of the present embodiment, as shown in FIG. 3, the conductor 106a such as a copper wire, the enamel layer 106b covering the outer peripheral surface of the conductor 106a, and the insulation covering the outer peripheral surface of the enamel layer 106b. It has a body layer 106c. As described above, when the pump device 500 of the present embodiment pumps hot water at about 100 ° C., the stator coil 106 can be heated to about 180 ° C. Therefore, in the present embodiment, as the enamel layer 106b, an amideimide (AI) resin enamel having a heat resistant temperature of 180 ° C. or higher is used.

Further, it is conceivable to use a fluororesin as the insulator layer 106c. Examples of the fluororesin include ETFE (ethylene / fluorinated ethylene copolymer), PTFE (polytetrafluoroethylene), PFA (perfluoroalkoxy alkane resin), and FEP (fluorinated ethylene / propylene hexafluorinated copolymer). ) Etc. are known. However, since ETFE has a heat resistant temperature of about 150 ° C., it is not suitable for the stator coil 106 which can be heated up to about 180 ° C. Further, since PTFE has a porous shape, the thickness of the insulator layer 106c needs to be about 4 mm in order to have sufficient water resistance, and the volume thereof becomes too large, which is not suitable. Therefore, in the present embodiment, as the insulator layer 106c, an insulator containing PFA having a heat resistant temperature of about 200 ° C. or FEP having a heat resistant temperature of about 250 ° C. as a main component is used. FEP and PFA are water resistant materials. Since FEP is generally cheaper than PFA, it is desirable to use FEP.

The adhesion between the copper conductor 106a and the fluororesin insulator layer 106c is generally not good. In particular, when the stator coil 106 is wound around the stator core 105, minute gaps (voids) are likely to occur in the curved portion of the stator coil 106. When the temperature of the stator coil 106 becomes high, the conductor 106a may corrode (copper damage) in this gap. In the present embodiment, by providing the enamel layer 106b made of amidimide resin enamel between the conductor 106a and the insulator layer 106c, the adhesion of the insulator layer 106c can be improved and copper damage can be prevented. can. Since FEP and PFA have very good slipperiness, it is not necessary to have a further outer layer on the outer periphery of the insulator layer 106c.

Next, the filling liquid 114 to be sealed in the casing 101 will be described. In this embodiment, propylene glycol, which is an antifreeze liquid, is used as the encapsulating liquid 114. Propylene glycol is water soluble. Therefore, even if the motor 100 is damaged and the encapsulating liquid 114 leaks to the outside of the motor 100, it dissolves in warm water and does not float on the liquid surface like oil. Moreover, since propylene glycol is harmless to humans and animals, even if it is mixed with hot water, it does not adversely affect the human body using hot water.

Further, it is preferable to use propylene glycol containing almost no impurities as the encapsulating liquid 114, and specifically, it is preferable to enclose propylene glycol in an amount of 97% by mass or more. FIG. 4 is a graph showing the boiling point with respect to the concentration of propylene glycol. As described above, when the pump device 500 of the present embodiment pumps up hot water at about 100 ° C., the filling liquid 114 can be heated to about 140 ° C. to 150 ° C. Therefore, in the present embodiment, the concentration of propylene glycol is set to 97% by mass or more so as to have a boiling point of, for example, 160 ° C. or higher. As a result, even if the pump device 500 pumps hot water at about 100 ° C., it is possible to prevent the filling liquid 114 from boiling.

FIG. 5 is a graph showing the viscosity with respect to the concentration of propylene glycol. As shown in FIG. 5, it is known that the viscosity of propylene glycol increases as the concentration increases. When propylene glycol having a high viscosity is used as the filling liquid 114, a large stirring loss generally occurs. However, when pumping hot water having a relatively high temperature (80 ° C. to 100 ° C.) like the pump device 500 of the present embodiment, the temperature of propylene glycol becomes 100 ° C. or higher. Therefore, as shown in FIG. 5, for example, even if the propylene glycol has a concentration of 97% by mass, the propylene glycol having a concentration of about 25% by mass is 20 ° C. at 100 ° C. It will have almost the same viscosity. That is, when pumping hot water having a relatively high temperature as in the pump device 500 of the present embodiment, the stirring loss due to the high concentration of propylene glycol does not matter.

Further, the motor 100 of the present embodiment does not have a can-can structure because it is configured so that the stator coil 106 can be replaced (rewound) as described above. Generally, the can is made of non-magnetic stainless steel material. When the motor is driven, an eddy current is generated in the can due to the rotating magnetic field of the stator coil, and the can itself generates heat. This heat generation causes loss of the motor, and the heat generation due to this eddy current increases as the motor becomes larger. Therefore, since the motor 100 of the present embodiment does not have a can structure, the loss is smaller than that of the motor having the can structure, and the temperature of the encapsulant 114 can be suppressed. As shown in FIG. 5, the boiling point of propylene glycol is about 188 ° C. even when the concentration is 100% by mass. If the motor 100 has a can-type structure, the temperature of the encapsulating liquid 114 may exceed 188 ° C. when hot water of about 100 ° C. is pumped up. Therefore, in other words, since the motor 100 of the present embodiment does not have a canned structure, propylene glycol can be used as the encapsulating liquid 114 even when hot water of about 100 ° C. is pumped up.

Next, the details of the end portion on the opposite load side of the motor 100 will be described. FIG. 6 is an enlarged cross-sectional view of the motor 100 on the opposite load side. As shown in FIG. 6, the motor 100 has a thrust receiving case 161 connected to the reverse load side bracket 122 shown in FIG. 2 and an end cover 163 connected to the thrust receiving case 161. The thrust receiving case 161 is fixed to the counterload side bracket 122 by bolts 162. Further, the end cover 163 is fixed to the thrust receiving case 161 by bolts 164. The diaphragm 182 is arranged in the space formed by the thrust receiving case 161 and the end cover 163. The diaphragm 182 is provided so as to partition this space between the diaphragm storage chamber 165 and the external communication chamber 166 (that is, the outside of the motor 100). That is, the diaphragm storage chamber 165 is defined by the diaphragm 182 and the thrust receiving case 161. The diaphragm storage chamber 165 communicates fluidly with the internal space of the casing 101 shown in FIG. 2 through the communication hole 167 provided in the thrust receiving case 161. Therefore, the diaphragm storage chamber 165 is configured to contain the filling liquid 114.

The motor 100 further includes a first urging member 168 arranged in the external communication chamber 166 and a second urging member 169 arranged in the diaphragm storage chamber 165. In the present embodiment, coil springs are shown as the first urging member 168 and the second urging member 169, but the present invention is not limited to this, and any urging member such as a leaf spring or a countersunk spring can be used. .. The first urging member 168 and the second urging member 169 are provided so that their respective urging forces face each other and are substantially parallel to each other. Specifically, the first urging member 168 urges the diaphragm 182 in a direction in which the space of the diaphragm storage chamber 165 becomes smaller. The second urging member 169 is arranged between the end surface 171 of the thrust receiving case 161 and the diaphragm protective plate 170 arranged in the diaphragm storage chamber 165, and the diaphragm 182 is attached in a direction in which the space of the diaphragm storage chamber 165 increases. Momentum.

A plate-shaped diaphragm protective plate 170 is provided on the diaphragm storage chamber 165 side of the diaphragm 182. The diaphragm protective plate 170 is arranged so as to face the end surface 171 (corresponding to an example of the storage chamber wall portion) of the thrust receiving case 161. The first urging member 168 urges the diaphragm 182 in the direction of the diaphragm storage chamber 165. As a result, the diaphragm protective plate 170 is urged in the direction of the end surface 171 of the thrust receiving case 161 via the diaphragm 182. The second urging member 169 urges the diaphragm protective plate 170 in the direction opposite to that of the first urging member 168 . The first urging member 168 and the second urging member 169 are configured to balance each other via the diaphragm protective plate 170 at room temperature to maintain the volume of the diaphragm storage chamber 165 at a predetermined volume. Specifically, the first urging member 168 and the second urging member 169 are balanced via the diaphragm protective plate 170, so that the diaphragm protective plate 170 is held at a predetermined distance from the end surface 171. The normal temperature in the present specification means the atmospheric temperature when the pump device 500 is not immersed in hot water such as a well and is placed on land, for example, about 15 ° C. to 25 ° C.

As described above, in the present embodiment, propylene glycol having a concentration of 97% by mass or more is used as the encapsulating liquid 114. Since such high-concentration propylene glycol has a high viscosity at room temperature, air is likely to be mixed when the filling liquid 114 is sealed in the casing 101. When the motor 100 containing the filling liquid 114 mixed with air is submerged in the well in this way, the diaphragm 182 stores the diaphragm so as to reduce the volume in the casing 101 while the air portion is compressed by the pressure of the pumping water. The chamber 165 moves in a direction in which the volume becomes smaller.

Consider the case where the motor 100 does not have the second urging member 169. FIG. 7 is a cross-sectional view showing an example of the behavior of the diaphragm 182 when the motor 100 does not have the second urging member 169. In this case, the diaphragm 182 and the diaphragm protective plate 170 are urged by the first urging member 168 so as to come into contact with the end face 171. Therefore, when the motor 100 is submerged in the well and receives the pressure of pumping water as described above, the diaphragm protective plate 170 cannot move any more, and the folded portion of the diaphragm 182 faces the diaphragm storage chamber 165 as shown in FIG. And move. As a result, the folded portion of the diaphragm 182 moves so as to bite into the diaphragm 182, and the normal function of the diaphragm may be impaired.

As described above, the motor 100 of the present embodiment has a second urging member 169, and the first urging member 168 and the second urging member 169 are balanced with each other at room temperature to determine the volume of the diaphragm storage chamber 165. It is configured to maintain the volume of. As a result, when the motor 100 is submerged in the well and the pressure of pumping water is applied, the space where the diaphragm 182 can move is secured by the amount that the diaphragm protective plate 170 is urged by the second urging member 169. Therefore, the diaphragm 182 can be moved in a direction in which the volume of the diaphragm storage chamber 165 becomes smaller, and the diaphragm 182 can be prevented from being bitten as shown in FIG.

As described above, in the motor 100 according to the present embodiment, the conductor 106a constituting the stator coil 106 is covered with the insulator layer 106c containing FEP or PFA as a main component. As a result, the insulating property of the stator coil 106 can be maintained even when high-temperature well water of about 80 ° C. to 100 ° C. is pumped up. Further, since the stator coil 106 has an enamel layer 106b made of amidimide resin enamel between the conductor 106a and the insulator layer 106c, the conductor 106a and the insulator layer 106c can be brought into good contact with each other.

Further, the motor 100 according to the present embodiment uses propylene glycol as the encapsulating liquid 114. As a result, even if the motor 100 is damaged and the encapsulating liquid 114 leaks to the outside of the motor 100, it dissolves in warm water and does not float on the liquid surface like oil. Moreover, since propylene glycol is harmless to humans and animals, even if it is mixed with hot water, it does not adversely affect the human body using hot water. Further, since the concentration of propylene glycol is 97% by mass or more, it is possible to prevent the filling liquid 114 from boiling even if the pump device 500 pumps hot water at about 100 ° C.

The motor 100 according to the present embodiment has a second urging member 169, and the volume of the diaphragm storage chamber 165 is maintained at a predetermined volume. As a result, a space in which the diaphragm 182 can move is secured by the amount that the diaphragm protective plate 170 is urged by the second urging member 169. Therefore, even if high-concentration (high-viscosity) propylene glycol is used as the filling liquid 114, when the motor 100 is submerged in a well and subjected to the pressure of pumping water, the diaphragm 182 tends to reduce the volume of the diaphragm storage chamber 165. It is possible to prevent the diaphragm 182 from being bitten as shown in FIG.

Although the embodiments of the present invention have been described above, the above-described embodiments of the invention are for facilitating the understanding of the present invention and do not limit the present invention. The present invention can be modified and improved without departing from the spirit thereof, and it goes without saying that the present invention includes an equivalent thereof. In addition, any combination or omission of the claims and the components described in the specification is possible within the range in which at least a part of the above-mentioned problems can be solved or in the range in which at least a part of the effect is exhibited. be.

100 ... Motor 101 ... Casing 104 ... Stator 106 ... Stator coil 106a ... Conductor 106b ... Enamel layer 106c ... Insulator layer 107 ... Rotor 110 ... Output shaft 114 ... Filling liquid 165 ... Diaphragm storage chamber 166 ... External communication chamber 167 ... Communication hole 168 ... 1st urging member 169 ... 2nd urging member 171 ... End face 182 ... Diaphragm

Claims (6)

A motor in which the filling liquid is filled.
A casing configured to enclose the encapsulant and block external fluids from entering the interior.
A rotor that rotates in the casing and
It has a stator arranged on the outer peripheral side of the rotor in the casing, and has.
The stator is mainly composed of a conductor, an amidimide resin enamel that covers the outer peripheral surface of the conductor, and a perfluoroalkoxy alkane resin or a tetrafluorinated ethylene hexafluoride propylene copolymer that covers the outer peripheral surface of the amidimide resin enamel. , an insulator to have a winding having,
The motor further
A storage chamber that communicates with the internal space of the casing and is configured to accept the encapsulant.
A diaphragm, which is an elastic film, is provided so as to partition the storage chamber and the outside of the motor.
A first urging member that urges the diaphragm in a direction in which the space of the storage chamber becomes smaller,
It has a second urging member that urges the diaphragm in a direction in which the space of the storage chamber becomes larger.
A motor in which the first urging member and the second urging member are configured to balance each other at room temperature to maintain the volume of the storage chamber at a predetermined volume. In the motor according to claim 1,
The encapsulant is a propylene glycol having a concentration of 97% by mass or more, that is, a motor. In the motor according to claim 1 or 2.
A diaphragm protective plate is provided on the storage chamber side of the diaphragm.
The first urging member is a motor that urges the diaphragm via the diaphragm protective plate. In the motor according to any one of claims 1 to 3.
It has a storage chamber wall portion that defines the storage chamber together with the diaphragm.
The second urging member is a motor that is arranged between the storage chamber wall portion and the diaphragm and forms a gap between the storage chamber wall portion and the diaphragm. In the motor according to any one of claims 1 to 4.
The winding is a motor configured to be rewound with respect to the stator. The motor according to any one of claims 1 to 5, and the motor.
A pump device comprising a pump connected to the output shaft of the motor.

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