KR20060008868A - Travelling-wave machine - Google Patents

Abstract

The invention relates to a travelling- wave machine comprising a stator (10) and a rotor, each having at least one stator winding (14) or rotor winding. According to the invention, the stator (10) and the rotor have a soft magnetic iron body with a stator back (10a) or rotor back, equipped with interspaced grooves (16) that form teeth (18). The stator winding (14) and rotor winding comprise conductive bars (20) that are arranged in the grooves (16) of the stator (10) or rotor in addition to front connectors (22) that connect the conductive bars (20) and are arranged on the end faces of the stator (10) or rotor. Said front connectors are connected conductively to the conductive bars (20) in order to electrically connect conductive bars in grooves (16) lying at a distance from one another. The front connectors (22) form a multi-layer stack (25) and comprise at least one thermally conductive projecting element (28), which leads to a heat sink (30).

Description

Traveling wave device {TRAVELLING-WAVE MACHINE}

The present invention relates to a traveling field machine. More particularly, the present invention provides a soft magnetic iron having a stator and a rotor each including at least one stator coil or a rotor coil, the stator or rotor having a stator back or a rotor back. A moving magnetic field device including a main body. The magnetic soft iron body is provided with spaced grooves forming teeth, which are directed toward the air gap formed by the stator and the rotor.

The term " mobile magnetic field device ", i.e., asynchronous device, synchronous device, magnetoresistive device, etc. encompasses not only a motor, but also a generator, and it is not important in the present invention whether the mobile magnetic field device is a rotating device or a linear motor, for example. . Further, the present invention can be applied to both the internal rotor device and the external rotor device.

In order to reduce the volume of high efficiency electrical devices, the configuration form and arrangement of the conductors play a very important role. Providing a conductor with the smallest projecting length of the winding while utilizing the space efficiently reduces resistive losses and increases the power density of the electrical device.

Since the resistive losses of the control and windings are proportional to the current to be connected, a conductor of a certain length must be provided in the magnetic field in order to generate as low an induced reverse voltage as possible corresponding to the desired high regulating voltage of the resistor device conductor.

Most of the conventional electrical devices have been wound with a continuous wire (mostly round cross section). Although thin flexible wires can easily be located in the grooves, this has the disadvantage of not using the groove space of the grooves and the windings efficiently. Round cross sections do not fully utilize the cross section of the groove. In order to increase the filling rate of the grooves (total wire cross-sectional area / groove cross-sectional area), so-called preformed coils are used, in which rectangular conductor bars are fitted into the grooves, which are fitted to the geometric cross-sectional shape of the grooves and whose ends are connected to form coils. do. Various problem solving methods are known which focus on the geometry of the projections of the windings in order to reduce the resistance losses of the projections of the windings, ie the coil conductor portions projecting from the grooves.

German Patent Publication No. 39 03 752 A1 discloses a stator for a three-phase generator, the stator core assembly of the stator comprising a groove in which the stator windings are arranged. The stator windings in the grooves have a rectangular cross section, and the stator windings forming the coil end outside the grooves have a circular cross section. The stator winding having a circular cross section is formed by a hollow cylindrical conductor. A stator winding having a rectangular cross section is formed by compressing a hollow cylindrical conductor.

British Patent Publication No. 3 329 205 discloses a method for producing a winding as a casting body, the end (protruding from the groove) having a larger cross section compared to the conductor portion in the groove.

EP 1 039 616 A2 discloses a moving magnetic field device in which the stator has a stator coil. The stator has a magnetic wrought iron body with a stator back, and spaced grooves are formed on the back of the stator to form teeth. The stator coil has a conductor bar disposed in the groove and an end winding portion connected to the conductor bar and disposed on the end face of the stator. The end windings of the stator coils are intersected with the groove bottom and protrude toward the back of the stator above the groove bottom. The stator portion of the stator end surface region projects radially inward beyond its end surface region. The end winding and the conductor bar are riveted together by a pin.

German Patent Publication No. 1 123 038 and German Patent Publication No. 101 56 268 disclose a stator for an electrical device, which includes at least one tubing extending circumferentially around the periphery of the protrusion of the winding. The coolant flows through each pipe, dissipating the heat dissipated from the protrusions of the windings. The tubing of the stator disclosed in German Patent Publication No. 1 123 038 must be attached and fixed to the protrusion of the winding by means of copper strips and bolts in a complex arrangement. The tubing of the stator disclosed in German Patent Publication No. 101 56 268 is fixed locally only at a very limited part of the periphery of the protrusion of the winding. Thus, in both of these cases, thermal contact between the protrusions of the windings and the coolant is not optimal.

German Patent Publication No. 101 43 217 discloses a technically advanced moving magnetic field device, in which each stator or rotor has an end winding having a certain thickness in a direction intersecting an air gap located between the stator and the rotor. And the thickness is related to the thickness and number of conductor bars and the thickness of the back of the stator or of the rotor.

According to the known devices described above, these devices have the disadvantage of only partially meeting the power density and reliability requirements defined in various applications. In particular, in applications where the ambient temperature of the electrical device is high (approximately 100 ° C. or more), the resistance of the coil material becomes high, which leads to a significant increase in the resistance loss of the coil, which in turn increases the overall loss significantly. The device should also be efficient in terms of heat and the assembly should not be complicated.

In order to solve this problem, according to the present invention, there is provided a moving magnetic field device of the type mentioned above having a stator and a rotor, each of which comprises at least one stator coil or a rotor coil, each of which has a stator rear face. Or a magnetic wrought iron body each having a rotor back and having spaced grooves forming teeth, each of the stator coils or rotor coils being connected to a conductor bar, the conductor bar being disposed in a groove of the stator or rotor, respectively. At least one end winding portion connected in an electrically conductive manner so as to electrically connect the conductor bars of the spaced grooves and disposed respectively on the end face of the stator or the rotor, the end winding portions extending to a heat sink. Provided is a moving magnetic field device for forming a laminated packet from which a thermally conductive member of the projection protrudes. The. Each of the end windings is formed of a thin planar sheet extending approximately into the heat sink or into the heat sink in a radial extension about the longitudinal central axis of the stator or rotor.

This configuration allows for maximum utilization of the available space (axially and radially or laterally), and at the same time reliable, even in applications where the ambient temperature of the electrical device is high (approximately 100 ° C. or more). In addition to very high operation, output optimization of the electrical device is achieved.

According to one preferred embodiment of the invention, the thermally conductive member is located in a thermal region (surface region) in contact with the at least one end winding portion to form a thermal conductive portion of the heat sink. Optionally, the thermally conductive member is formed as an extension of one end winding portion to protrude from the end winding portion to form a heat conduction portion of the heat sink.

Thus, each of the thermally conductive members protrudes into the heat sink or is connected to the outer wall of the heat sink in a manner that conducts heat, depending on the configuration.

Preferably, the heat sink is a fluid cooling means arranged concentrically with the conductor bar.

Each of the end windings may be formed of a thin planar sheet extending approximately into the heat sink or into the heat sink in a radial extension about the longitudinal central axis of the stator or rotor.

Each of the end windings, which may be formed of a thin planar sheet, may be directed in a direction intersecting with the longitudinal center axis of the stator or rotor or in a direction in contact with the longitudinal center axis. That is, the end windings are directed flat or upright. The thermally conductive member has the same direction as the end winding portion.

Each end of the conductor bar has a pin that engages a correspondingly shaped groove at one end of the end winding to form an electrically conductive connection.

An electrically conductive connection between the end of the end winding and the end of the conductor bar may be formed by electrical instantaneous welding. Optionally, the ends of the end windings may be coupled to the ends of the conductor bars in an electrically conductive manner by laser welding.

According to the insulation requirements to be met by the coils of the moving magnetic field device according to the invention, the conductor bars and / or the end windings are equipped with a synthetic material, ceramic or enamel coating. However, it is also possible to form the conductors from aluminum so that the conductor bars or end windings are mutually insulated by the aluminum layer.

In a similar manner, the thermally conductive member can be formed of copper, aluminum or an alloy comprising them. Optionally, the thermally conductive member may be formed of aluminum nitride.

Preferably, the heat sink is formed by the wall region which together with the thermally conductive member forms a channel for the heat dissipating fluid, in particular water or oil.

According to one preferred embodiment of the moving magnetic field device of the present invention, the wall region of the heat sink is formed by an annular member concentric to the longitudinal center axis of the stator or rotor, with adjacent annular members being thermoelectric between the annular members. Each of the conductive members is accommodated.

In order to form a cooling channel through which the heat dissipation fluid flows, the wall region of the heat sink is joined to the thermally conductive member by brazing, welding, adhesive bonding or other ways such that the fluid is sealed and size stabilized.

Preferably, the wall region and the thermally conductive member of the heat sink are made of copper, aluminum or other thermally conductive material. However, other materials having excellent thermal conductivity may be used depending on the characteristics of the field in which the moving magnetic field device is applied.

Cooling channels connecting the heat sinks for the end windings with the heat sinks of the stator or rotor in fluid communication may constitute an electrical device provided in the stator or rotor. This reduces the cost for the fluid line. The heat sink for the end winding may also be mechanically connected to the fluid channel.

Preferably, this fluid channel is arranged on the back of the stator or rotor as a heat sink.

Those skilled in the art will clearly appreciate other features, features, advantages and possible variations of the present invention from the following description with reference to the accompanying drawings.

1 is a schematic cross-sectional view of a stator of an electrical device according to the invention.

FIG. 2 is a schematic cross-sectional view of the stator of the electrical device according to FIG. 1, taken along line II-II.

In the figures there is shown a stator 10 for an electric device according to the invention of an external rotor device (not shown in detail), which can also be applied to the internal rotor device. According to the present embodiment, the stator 10 is made of the laminated sheet 11, but may be composed of iron particles that are pressed and sintered in an appropriate shape.

The stator 10 is a soft magnetic iron body having a stator back surface 10a, which has grooves 12 disposed adjacent to each other, by which the windings of each of the stator coil windings 14 are wound. The sub chamber is formed. According to the illustrated embodiment, the windings chamber 12 has a rectangular cross section and has a slot 16 on the side facing the stator (not shown). Thus, teeth 18 are formed respectively between the two slots 16 (see FIG. 1). The end winding 22 is directed parallel to the end face or seat 11 of the stator or rotor.

Each stator coil 14 is formed by a conductor bar 20 having a rectangular cross section, which is inserted into the winding chamber 12 and coupled with the end winding 22. The end windings 22 of all windings together form the protrusion 24 of the winding. Only one end of the conductor bar or one end of the stator is shown in the sectional view shown in FIG. 2, respectively. The other end, not shown, is mirror symmetrical with it.

As shown in FIG. 2, the electrically conductive connecting end winding 22 forms a stacked packet 26, in which a fluid channel flows coolant between the two end windings 22 of the stacked packet. Each of the thermally conductive members 28 extending toward the heat sink 30 protrudes.

The thermally conductive member 28 is located in a thermal region (surface region) in contact with the end winding portion 22 to form a thermal conductive portion of the heat sink. To this end, the thermally conductive member 28 extends into the heat sink 30. As shown in FIG. 2, the end winding 22 extends from each conductor bar 20 into the heat sink 30 in a radial extension about the longitudinal central axis M of the stator 10. Is formed into a thin flat sheet.

The conductor bar 20 and the end winding portion 22 of the present embodiment are made of copper, and a pin 20a is provided at the end of the conductor bar and the end winding portion. Each pin 20a is engaged with a corresponding groove 22a at the end of the corresponding end winding 22 to form an electrically conductive connection with the groove. For this purpose, the pin 22a is coupled with the groove 22a at the end of the end winding portion 22 by electric instant welding or laser welding to become electrically conductive. However, butt welding may be performed by omitting the pins 20a and the grooves 22a. Each conductor bar and end winding is provided with a ceramic or enamel coating for electrical insulation.

The fluid channel 30 through which the coolant flows and forms the heat sink is formed by the wall regions 30a and 30b which together with the thermally conductive member 28 form a hollow annular cylindrical channel for the heat dissipation fluid. To this end, the wall regions of the heat sink 30 are formed by annular members 30a, 30b concentric with the longitudinal central axis M of the stator 10, with adjacent annular members 30a, 30a and 30b. , 30b) each receive a thermally conductive member 28 therebetween and are welded or brazed with the thermally conductive member.

As shown in FIG. 1, the thermally conductive member 28 has an arc shape, wherein the radial extension 28a extends from the pin 20a to the conductor bar 20 which is welded with the radial extension. . The radially interior of the thermally conductive member 28 extending into the heat sink 30 has a groove 28b along the annular channel shape of the heat sink 30 so as not to disturb the flow of the cooling fluid.

As shown in FIG. 2, the rear surface 10a of the stator 10 is provided with a fluid cooling unit in the form of a coolant channel 40. The coolant channel 40 is arranged concentrically with the fluid channel 30 through which the coolant flows for cooling the end winding 22. In addition, two cooling means are connected by the passage 42 in a manner that communicates the fluid.

The ratio and size and material thickness between the individual members and parts thereof shown in the figures are not limiting. Each size may be different than shown.

Claims (15)

A stator 10 and a rotor each including at least one stator coil 14 or a rotor coil, Each of the stator 10 or the rotor includes a magnetic wrought iron body having spaced grooves 16 each having a stator back 10a or a rotor back and forming teeth 18, Each of the stator coils 14 or the rotor coils includes a plurality of conductor bars 20 disposed in the stator 10 or the groove 16 of the rotor, respectively, and the grooves connected to and spaced apart from the conductor bars 20. A plurality of end windings 22 connected in an electrically conductive manner so as to electrically connect the conductor bars of 16 and disposed respectively on the end face of the stator 10 or the rotor, In the moving magnetic field device, the end winding part 22 forms a laminated packet 25 from which at least one thermally conductive member 28 extending from the heat sink 30 protrudes. Each of the end windings 22 is approximately from the conductor bar 20 to the heat sink 30 or into the heat sink 30 in the radial extension of the stator 10 or the longitudinal center axis of the rotor. A moving magnetic field device, characterized in that it is formed of an elongated thin flat sheet. The method of claim 1, The thermally conductive member 28 is located in a thermal region (surface region) in contact with the at least one end winding portion 22 to form a thermal conductive portion with the heat sink, or as an extension of the thermal conductive member 28. And a moving magnetic field device protruding from the end winding portion. The method of claim 1, Each of the thermally conductive members (28) extends into the heat sink (30) or is connected to the outer walls (30a, 30b) of the heat sink in a manner that conducts heat. The method according to any of the preceding claims, Heat sink (30) is a moving magnetic field device, characterized in that the fluid cooling means arranged concentrically with the conductor bar (20). The method according to any of the preceding claims, Each of the end winding portions 22 formed of a thin flat sheet is oriented in a direction intersecting with the longitudinal center axis of the stator 10 or the rotor or in a direction in contact with the longitudinal center axis. . The method according to any of the preceding claims, Each end of the conductor bar 20 has a pin 20a, which is engaged with the groove 22b at the end of the end winding to form an electrically conductive connection with the end winding 22. Moving magnetic field device. The method according to any of the preceding claims, And the electrically conductive connection is formed by electrical instantaneous welding. The method according to any of the preceding claims, A moving magnetic field device, characterized in that the end of the end winding part (22) is coupled to the end of the conductor bar (20) in an electrically conductive manner by laser welding. The method according to any of the preceding claims, A moving magnetic field device, characterized in that the conductor bar (20) and / or the end windings (22) comprise a ceramic or enamel coating. The method according to any of the preceding claims, The heat sink is formed by a wall region (30a, 30b) which together with the thermally conductive member (28) forms a channel for the heat dissipation fluid. The method according to any of the preceding claims, The wall region of the heat sink 30 is formed by annular members 30a, 30b concentric to the longitudinal central axis of the stator 10 or the rotor, and adjacent annular members 30a, 30a; 30b, 30b A moving magnetic field device, each receiving a thermally conductive member (28) between annular members. The method according to any of the preceding claims, The wall regions 30a, 30b of the heat sink 30 are coupled to the thermally conductive member 28 by brazing, welding, adhesive bonding or otherwise in such a way that the fluid is sealed and stable in size. Device. The method according to any of the preceding claims, A moving magnetic field device, characterized in that the wall regions (30a, 30b) and the thermally conductive member (28) of the heat sink (30) are made of copper, aluminum or other thermally conductive material. The method according to any of the preceding claims, The moving magnetic field device, characterized in that the heat sink 30 of the end winding 22 is connected to the heat sink 40 for the stator 10 or the rotor in fluid communication via at least one passage 42. . The method according to any of the preceding claims, Moving magnetic field device, characterized in that the heat sink for the stator (10) or the rotor is disposed on the back (10a).

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