JP2010110025A - Cooling device for rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling device for a rotating machine, capable of highly efficiently discharging heat generated in a stator coil. <P>SOLUTION: The rotating electric machine includes: a stator core 800 fitted to the inside of a frame 200 and having a plurality of slots for housing a stator coil 900 in its inner circumferential portion; rotors 500 disposed so as to oppose to each other via a gap on the internal circumferential surface of the stator core 800; the frame 200 provided outside the stator core 800; brackets 80a, 80b for supporting the load side and an anti-load side of the stator 500; and a cooling jacket 300 for circulating a coolant between the stator core 800 and the frame 200. In the rotating electric machine, the cooling jacket 300 configures cooling jackets 300b, 300c and 300d having a plurality of microchannels formed concentrically with the frame so as to highly efficiently transmit loss heat generated in the stator coil and the stator core to the frame. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cooling device for a rotating electrical machine composed of a motor and a generator.

In a conventional rotary motor cooling device, a cooling jacket composed of a spiral hollow copper tube is provided between the stator core and the frame, and the coolant is passed through the coolant passage of the cooling jacket, so that the slots of the stator core are provided. There is a motor that cools a motor by removing heat generated from a wound stator coil (see, for example, Patent Document 1).
In addition, conventionally, there is a type in which a jet-like refrigerant is constantly ejected to the coil end of the motor and the heat generated in the coil is removed to cool the motor (for example, see Patent Document 2).

FIG. 4 is a side sectional view of the motor cooling device showing the first prior art.
In FIG. 4, 100 is a motor, 200 is a frame, 300 is a cooling jacket, 40 is a refrigerant supply port, 50 is a refrigerant discharge port, 60a and 60b are thermally conductive resins, 70a and 70b are coil ends, and 80a and 80b are brackets. , 350 is a refrigerant passage formed of a spiral hollow copper tube, 500 is a rotor, 700 is a stator, 800 is a stator core, and 900 is a stator coil.
The motor 100 includes a cylindrical frame 200, a stator core 800 that is fitted inside the frame 200 and has a plurality of slots that accommodate the stator coil 900 and that is provided on the inner periphery thereof. 700, a rotor 500 disposed opposite to the inner peripheral surface of the stator core 800 via a magnetic gap, a frame 200 provided outside the stator core 800, and both ends of the frame 200 and bearings. And a cooling jacket 300 having a spiral refrigerant passage 350 for passing a refrigerant between the stator core 800 and the frame 200. The brackets 80a and 80b support the load side and the anti-load side of the rotor 500 via Has been. The cooling jacket 300 is provided with a refrigerant supply port 40 that receives refrigerant from an external refrigerant supply device (not shown), and a refrigerant discharge port 50 that discharges the refrigerant to the external refrigerant supply device at the other end. Further, in order to efficiently transfer heat loss generated in the stator coil 900 and the stator core 800 to the frame 200, the heat conductive resins 60a and 60b are filled between the coil ends 70a and 70b and the cooling jacket 300. ing.
First, a refrigerant is supplied to the cooling jacket 300 via the refrigerant supply port 40 by an external refrigerant supply device (not shown), and the refrigerant supplied to the cooling jacket 300 spirally passes through the refrigerant passage 350 of the cooling jacket 300. While flowing toward the refrigerant discharge port 50, the heat loss generated in the stator coil 900 and the stator core 800 in this process is removed to cool the motor 100.

FIG. 5 is a side sectional view of the motor cooling device showing the second prior art, and FIG. 6 shows the relationship between the time and flow rate of the refrigerant flowing through the device of FIG.
In addition, description is abbreviate | omitted about the component with the 2nd prior art same as the 1st prior art.
In FIG. 5, 45 is a refrigerant | coolant jet nozzle. In the vicinity of the load side bracket 80a and the anti-load side bracket 80b in the frame 200, a refrigerant jet nozzle 45 is provided inside the stator so as to penetrate the frame 200. The refrigerant jet nozzle 45 is not shown in the figure. Refrigerant is supplied from a refrigerant pipe connected to an external cooling supply source, and the jet refrigerant is steadily ejected toward the coil ends 70a and 70b, thereby removing heat generated in the stator coil 900. The motor 100 is cooled.
JP-A-8-251872 Utility model No. 2602410

However, in the case of the cooling jacket of the motor cooling device according to the first prior art, when the output per motor volume increases, the heat transferred from the stator core to the cooling jacket is exchanged by the refrigerant flowing through the refrigerant passage. In order to obtain the necessary heat transfer area, there is a limit to the heat transfer rate from the stator core to the cooling jacket, so that there has been a problem that motor heat cannot be efficiently removed.
In addition, since the heat conductivity in the axial direction of the motor coil is several tens of times higher than the heat conductivity in the radial direction, the heat generated in the coil tends to flow in the axial direction. In order to efficiently remove heat from the coil end, cooling was performed by constantly flowing a jet refrigerant through the coil end as shown in FIG. 6, but the output per unit volume of the motor increased. In addition, there is a limit to the cooling method in which heat is extracted from the coil end using a jet refrigerant.
The present invention has been made in view of such problems, and an object of the present invention is to provide a cooling device for a rotating electrical machine that can efficiently remove heat generated in a stator coil.

In order to solve the above-mentioned problem, the invention according to claim 1 of the present invention is provided with a cylindrical frame and a plurality of slots which are fitted inside the frame and which accommodate a stator coil. A stator composed of a stator core, a rotor disposed opposite to the inner peripheral surface of the stator core via a magnetic gap, and the rotor disposed at both ends of the frame and via bearings A rotating electrical machine comprising: a bracket that supports a load side and an anti-load side of the motor; and a cooling jacket that passes a refrigerant between the stator core and the frame. The cooling jacket includes the stator coil and the stator. A cooling jacket having a plurality of micro flow channels formed concentrically with the frame so as to efficiently transfer heat loss generated in the iron core to the frame. It is a symptom.
According to a second aspect of the present invention, in the rotating electric machine according to the first aspect, the cooling jacket is provided at a position facing the stator iron core and the frame so as to be in contact with an outer periphery of the stator iron core. A first cooling jacket having a micro-channel channel, a second cooling jacket having a micro-channel channel disposed between the stator core end and the load-side bracket, A third cooling jacket having a micro-channel channel disposed so as to be positioned between the stator core end and the anti-load side bracket, and the second cooling jacket and the third cooling jacket. A refrigerant jet that intermittently jets a jet of refrigerant toward the coil end by an external device on the coil end side of the stator coil in the jacket. It is characterized in that a nozzle.
The invention according to claim 3 is the rotating electrical machine according to claim 2, wherein the coolant is recovered after intermittently ejecting the coolant toward the coil end at the bottom of the rotating electrical machine. It features a collection channel.

According to the first aspect of the present invention, by providing the cooling jacket having the micro flow channel between the stator core and the frame, the heat generated in the stator coil can be efficiently removed, and the motor cooling Efficiency can be improved.
According to the second aspect of the present invention, in addition to the cooling jacket provided on the frame facing side of the stator core according to the first aspect, the cooling jacket having the micro flow channel is added to the stator core end and the load side. By providing a total of three locations between the brackets and between the stator core end and the anti-load side bracket, and by providing a refrigerant supply port for each, the flow control of each cooling jacket can be performed independently. In addition, since the heat transfer amount is increased as compared with the first aspect of the invention, a further heat removal effect can be obtained.
Furthermore, jet cooling refrigerant is intermittently applied to the coil ends of the motor coils from the refrigerant jet nozzles provided in the second cooling jacket and the third cooling jacket, so that they are generated at the coil ends with a high heat transfer coefficient. The heat to be discharged can be efficiently removed, and the motor cooling efficiency can be further improved as compared with the invention according to claim 1.
According to the invention described in claim 3, in order to remove the heat generated in the coil, the refrigerant jetted to the coil end is received by the refrigerant recovery channel provided at the bottom of the motor, and provided in the refrigerant recovery channel. The refrigerant released from the refrigerant outlet is returned to the cooling supply device for cooling, and again, the refrigerant supplied from the cooling supply device is circulated through the cooling jacket, so that the coil heat can be efficiently removed. The motor cooling efficiency can be further improved as compared with the second aspect of the invention.

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

FIG. 1 is a sectional side view of a motor cooling apparatus according to a first embodiment of the present invention. It should be noted that the description of the same constituent elements as those of the prior art is omitted, and only different points will be described.
In FIG. 1, 40a is a refrigerant supply port, 50a is a refrigerant discharge port, and 300a is a cooling jacket.
The present invention is different from the prior art in that a cooling jacket 300a provided between the stator core 800 and the frame 200 is replaced with a conventional spiral hollow copper tube, and a stator coil and a stator core are used. The structure is provided with a plurality of micro-channel channels formed concentrically with the frame so that the generated heat loss is efficiently transferred to the frame.
The plurality of micro flow channels provided inside the cooling jacket 300a are provided concentrically inside the frame 200 provided between the end of the load side bracket 80a and the end of the anti-load side bracket 80b. A refrigerant supply port 40a for receiving refrigerant from an external refrigerant supply device (not shown) is provided at one end of the cooling jacket 300a, and a refrigerant discharge port 50a for discharging the refrigerant is provided at the other end.

Next, effects obtained by providing the cooling jacket 300a having the micro flow channel between the stator core and the frame described above will be described below.
Since many micro flow channels are formed as fluid flow channels between the cylindrical frame 200 and the motor stator 700 by fine processing in a concentric manner, the flow of the refrigerant flow channel is larger than that in the conventional technique. Since the heat area increases, the heat transfer amount (heat transfer capacity) per unit area is considered to be very large. For example, when the output per volume of the motor increases, The flowing refrigerant is characterized in that the amount of heat transfer per unit volume from the stator core to the frame side becomes very large.
Therefore, in the first embodiment of the present invention, since the cooling jacket having the micro flow channel is provided on the frame facing side of the stator core, the transmission is compared with the cooling jacket configured by the conventional spiral hollow copper tube. Since the heat area is increased and the amount of heat transfer is increased, the heat exchange performance can be further improved, and the heat generated in the stator coil can be extracted with higher cooling efficiency than the prior art.

FIG. 2 is a sectional side view of a motor cooling apparatus according to a second embodiment of the present invention, and FIG. 3 is a sectional view taken along line AA in FIG.
In FIG. 2, 40b is a refrigerant supply port, 40c and 40d are refrigerant jet nozzles that also serve as the refrigerant supply port, and 50b and 50c are refrigerant discharge ports. Reference numeral 300b denotes a first cooling jacket, 300c denotes a second cooling jacket, and 300d denotes a third cooling jacket, both of which have microchannel channels. Reference numeral 170 denotes a refrigerant recovery channel.
The second embodiment is different from the first embodiment in that the cooling jacket has a micro-channel channel provided at a position facing the stator core 800 and the frame 200 so as to contact the outer periphery of the stator core 800. One cooling jacket 300b, a second cooling jacket 300c having a microchannel channel disposed so as to be positioned between the end of the stator core 800 and the load-side bracket 80a, and the end of the stator core 800 And a third cooling jacket 300d having a micro flow channel disposed so as to be positioned between the bracket and the anti-load side bracket 80b, and are fixed to the second cooling jacket 300c and the third cooling jacket 300d. The coil ends 70a and 70b of the child coil 900 are supplied with a jet-like refrigerant on the side by an external device. Headed refrigerant jet nozzle 40c for intermittently ejected, a point having a 40d.
Further, a refrigerant recovery channel 170 for recovering the refrigerant after intermittently ejecting the refrigerant toward the coil end is provided at the bottom of the motor.

Therefore, in the second embodiment of the present invention, the stator core has a total of three locations on the frame facing side, between the stator core end and the load side bracket, and between the stator core end and the anti-load side bracket. Since the heat transfer area is increased and the heat transfer amount is higher than in the first embodiment, the heat exchange performance can be further improved, and the stator coil is generated with high cooling efficiency. Heat can be extracted.
Further, when the refrigerant is unsteadily flowed to the second cooling jacket and the third cooling jacket by an external device and is intermittently jetted from the refrigerant jet nozzle toward the coil end, Heat generated in the stator coil with a high heat transfer rate due to intense turbulence in the temperature boundary layer generated in the refrigerant flowing on the coil end heat transfer surface, compared to the case where heat is extracted by flowing a jet-like refrigerant constantly. The heat can be removed.
Further, in the prior art, when a refrigerant jet nozzle is provided at a predetermined interval in the refrigerant pipe and the refrigerant flows, it is difficult to uniformly cool the coil end due to flow rate variation for each refrigerant jet nozzle. By using the channel, it is possible to design a flow path for each refrigerant jet nozzle and solve the problem of flow rate variation, so that the coil end can be cooled uniformly.
In addition, the flow rate of each part can be optimally controlled by allowing the refrigerant to flow into the cooling jacket independently from the external cooling supply device into the micro flow channel, and each cooling jacket can be transferred to the stator coil with maximum heat transfer efficiency. The generated heat can be removed.
Still further, the refrigerant extracted from the coil end is collected in the refrigerant recovery channel 170 provided at the bottom of the motor and flows into the motor cooling jacket as a cooling supply device provided outside from the refrigerant discharge port 50c. With the configuration of the present embodiment, the heat generated from the coil end can be extracted with a higher heat transfer rate than the prior art, and the motor can be efficiently cooled.
In addition, you may provide the cooling jacket provided with the microchannel channel in the inner peripheral surface of a load side bracket and an anti-load side bracket as needed.

  The present invention provides a cooling jacket having a micro flow channel between a stator core of a motor and a frame, and intermittently jets refrigerant from a plurality of refrigerant jet nozzles provided in the cooling jacket near the coil end by an external device. The heat generated in the coil can be removed from the stator core and the coil end with a high heat transfer rate, and the motor can be cooled efficiently. It can also be applied to.

1 is a side sectional view of a motor cooling device showing a first embodiment of the present invention. Side sectional view of a motor cooling device showing a second embodiment of the present invention. Sectional drawing which follows the A-A 'line in FIG. Side sectional view of motor cooling device showing conventional technology Side sectional view of motor cooling device showing conventional technology Fig. 5 shows the relationship between the time and flow rate of refrigerant flowing through the device of Fig. 5.

Explanation of symbols

100 Motors 40, 40a, 40b Refrigerant supply ports 40c, 40d Refrigerant jet nozzles 50, 50a, 50b, 50c Refrigerant discharge ports 60a, 60b Thermally conductive resins 70a, 70b Coil ends 80a, 80b Bracket 160 Jet refrigerant 170 Refrigerant recovery channel 200 Frame 300 Cooling jacket 300a, 300b, 300c, 300d Cooling jacket (micro flow channel)
350 Refrigerant passage 500 Rotor 700 Stator 800 Stator core 900 Stator coil

Claims (3)

A stator composed of a cylindrical frame, a stator core that is fitted inside the frame and that has a plurality of slots in the inner peripheral portion for accommodating a stator coil, and
A rotor disposed opposite to the inner peripheral surface of the stator core via a magnetic gap;
A bracket that is disposed at both ends of the frame and supports the load side and the anti-load side of the rotor via bearings;
A cooling jacket for passing a refrigerant between the stator core and the frame;
In the rotating electrical machine provided with
The cooling jacket includes a plurality of micro flow channel channels concentrically formed with the frame so as to efficiently transfer heat loss generated in the stator coil and the stator core to the frame. A cooling device for a rotating electric machine, characterized by being a jacket. The cooling jacket includes a first cooling jacket having a micro-channel channel provided at a position facing the stator core and the frame so as to be in contact with the outer periphery of the stator core, and an end of the stator core And a second cooling jacket having a microchannel channel disposed so as to be positioned between the load side bracket and the load side bracket, and disposed so as to be positioned between the stator core end and the counter load side bracket. A third cooling jacket having a microchannel channel formed,
A refrigerant jet nozzle for intermittently jetting a jet-like refrigerant toward the coil end by an external device is provided on the coil end side of the stator coil in the second cooling jacket and the third cooling jacket. The cooling device for a rotating electrical machine according to claim 1.   The cooling device for a rotating electric machine according to claim 2, wherein a refrigerant recovery channel for recovering the refrigerant after intermittently ejecting the refrigerant toward the coil end is provided at the bottom of the rotating electric machine. .

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