electric machine

Abstract

The present invention relates to an electric motor having a stator, a rotor (5), at least one motor winding (6), and at least one magnetohydrodynamic (MHD) temperature control assembly (10) integrated in the stator and / or rotor (5), and including a closed channel system and at least one MHD pump module (12). The channel system has at least one channel (14A) for guiding a conductive and thermally conductive medium (16) and is thermally coupled to the stator and / or rotor (5). The MHD pump module includes electrode devices (18) and is configured to conduct current (IP) through the medium at at least one channel segment (14.1) via the electrode devices (18). (16) and a Lorentz force (FL) is generated using the magnetic field (B) generated in the motor, which specifically accelerates the medium (16) in at least one channel segment (14.1), and the resulting pressure increase achieves the desired volumetric flow rate of the medium (16) through at least one channel (14A), wherein at least one magnetohydrodynamic pump module (12) is implemented and positioned such that the electrode device (18) conducts the current (IP) through the medium (16) perpendicular to the direction of the field lines of the magnetic field (B) and perpendicular to the channel segment (14.1), and the channel segment (14.1) is oriented perpendicular to the direction of the magnetic field (B).

Description

Technical Field

[0001] The present invention relates to an electric motor having a stator, a rotor, at least one motor winding and at least one temperature regulating component. Background Technology

[0002] Magnetohydrodynamics (MHD) is a subfield of physics. It describes the behavior of conductive fluids when passed through magnetic and electric fields. In a narrower sense, MHD deals with liquids, especially plasmas, which are described as fluids within the scope of MHD. Typical applications of MHD include flow effects and flow measurement in metallurgy and semiconductor single crystal growth. Thus, in metallurgy, magnetic fields can be used, for example, to influence the flow of liquid metals such as steel or aluminum. In applications, it is essential to distinguish between static magnetic fields and time-dependent magnetic fields. Static magnetic fields, i.e., time-independent magnetic fields, lead to a reduction in turbulence and are therefore used, for example, in the continuous casting of steel as magnetic brakes. Time-dependent magnetic fields are used, for example, for electromagnetic support in the casting of aluminum. Summary of the Invention

[0003] The motor having the features of independent claim 1 has the advantage that the stator and / or rotor components of the motor can be scalably temperature-controlled (cooled or heated) by at least one magnetohydrodynamic temperature control component. For example, heat generated in the stator and / or rotor of the motor can be absorbed, discharged, and distributed directly at the point of generation. This prevents hot spots. Alternatively, specific areas of the motor can be heated when needed.

[0004] Embodiments of the present invention provide an electric motor having a stator, a rotor, at least one motor winding, and at least one magnetohydrodynamic (MHD) temperature control assembly integrated in the stator and / or rotor. The at least one MHD temperature control assembly includes at least one enclosed channel system and at least one MHD pump module. The channel system has at least one channel for guiding a conductive and thermally conductive medium and is thermally coupled to the stator and / or rotor. The MHD pump module includes electrode devices and is configured to conduct current through the conductive and thermally conductive medium at least in at least one channel segment via the electrode devices and generate a Lorentz force using a magnetic field generated in the stator and / or rotor. This Lorentz force specifically accelerates the conductive and thermally conductive medium in the at least one channel segment, and the resulting pressure increase achieves a desired volumetric flow rate of the conductive and thermally conductive medium through at least one channel of the enclosed channel system. Here, the at least one MHD pump module is implemented and positioned such that the electrode devices conduct current through the conductive and thermally conductive medium perpendicular to the direction of the magnetic field lines and perpendicular to the at least one channel segment, and the at least one channel segment is oriented perpendicular to the direction of the magnetic field lines.

[0005] Depending on the structural conditions, at least one channel in a closed channel system can have a diameter of 1 mm. 2 Up to 100mm 2 The cross-sectional area is within a certain range. Of course, larger or smaller cross-sectional areas are also possible. Through this variable design possibility, at least one channel can be guided as close as possible to a temperature-sensitive component at a small distance. To achieve a planar effect, at least one channel can be shaped, for example, in a herringbone pattern and / or have a parallel channel structure. As long as the conditions regarding the direction of current flow or electric field, the direction of the field lines of the magnetic field, and the orientation of at least one channel segment can be met, at least one magnetohydrodynamic pump module can be positioned at any part of the motor.

[0006] In an embodiment with at least one magnetohydrodynamic (MHD) temperature control component, heat transfer can occur through a conductive and thermally conductive medium in a closed channel system within the motor, for example, not only in the stator and / or rotor, but also through thermal coupling with at least one cooling channel and through a coolant guided within at least one cooling channel. Therefore, unwanted heat can be easily removed from the motor. Furthermore, the MHD temperature control component embodiment can achieve significantly higher performance and efficiency motors compared to existing technologies, for example, through individual and / or dynamic and / or stepless and / or targeted and / or uniform cooling of the individual components to be cooled. If necessary, individual and / or dynamic and / or stepless and / or targeted and / or uniform heating of the motor components can also be achieved. Moreover, the absence of mechanically moving parts results in low mechanical wear and good noise behavior for at least one MHD pump module.

[0007] The motor can be implemented as a generator or an electric motor, for example. Therefore, the motor can be implemented as a synchronous motor, an asynchronous motor, or a permanent magnet-excited synchronous motor, wherein permanent magnets are arranged on the rotor. Here, the internal magnetic field of the motor is used in at least one pump module to generate a Lorentz force in a conductive and thermally conductive medium. The current used to generate the Lorentz force in the conductive and thermally conductive medium can be obtained, for example, from the power branch of the motor, or guided to at least one pump module from an external current source or internal energy source (e.g., a battery in the rotor) via additional input (e.g., via induction or a mold).

[0008] The term "conductive and thermally conductive medium" is subsequently understood to refer to a medium with a conductivity greater than 1 S / m (Siemens per meter). Preferably, the conductive and thermally conductive medium has a significantly higher conductivity (100-1000 S / m). Examples of conductive and thermally conductive media include conductive and thermally conductive liquids, conductive and thermally conductive gases, ionic liquids, at least one electrolyte, at least one plasma, at least one liquid metal such as gallium, lithium, sodium, or mercury, and / or at least one liquid metal alloy such as a sodium-potassium alloy. Furthermore, the conductive and thermally conductive medium can also be a fluid containing conductive particles, such as graphite flakes, copper particles, etc. Preferably, a non-toxic liquid metal alloy composed of gallium, indium, and tin can be used as the conductive and thermally conductive medium. This liquid metal alloy is already liquid at atmospheric pressure from a temperature of -20°C and can be easily heated from lower temperatures to -20°C or higher. However, the examples described herein for conductive and thermally conductive media are not considered definitive.

[0009] Advantageous improvements can be made to the motor described in independent claim 1 by means of the measures and improvements listed in the dependent claims.

[0010] Particularly advantageously, the electrode device may include two electrodes. Here, the first electrode of the electrode device can introduce a current with a predetermined current density into a conductive and thermally conductive medium at at least one channel section, and the second electrode of the electrode device can extract the current from the conductive and thermally conductive medium at at least one channel section. The current for the magnetohydrodynamic pump module can be extracted from at least one power branch of at least one motor winding of the motor to the electrode device of at least one magnetohydrodynamic pump module, or conducted to the electrode device of at least one magnetohydrodynamic pump module via an additional inlet device.

[0011] In another advantageous design of the motor, at least one magnetohydrodynamic pump module can be electrically connected in parallel or in series with at least one motor winding. This allows for particularly simple conduction of current for the at least one magnetohydrodynamic pump module. Alternatively, at least one magnetohydrodynamic pump module can draw voltage from at least one motor winding. Current for the at least one magnetohydrodynamic pump module is then generated from the drawn voltage.

[0012] In another advantageous design of the motor, at least one channel of the enclosed channel system can be thermally coupled to at least one heat source in at least one section and to at least one heat sink in at least one other section. Here, the volumetric flow rate of the conductive and thermally conductive medium in the enclosed channel system can absorb heat generated on the at least one heat source through convective heat transfer and transfer it to the at least one heat sink, thereby cooling the heat source. Because at least one channel can be directed to any part of the motor, corresponding temperature regulation can be achieved at any part of the motor.

[0013] In another advantageous design of the motor, at least one section of at least one channel thermally coupled to the heat source can be magnetically shielded. This advantageously prevents the existing magnetic field from adversely affecting the volumetric flow rate of the conductive and thermally conductive medium.

[0014] In another advantageous design of the motor, at least one heat source can be, for example, the permanent magnets of the rotor, where high temperatures can be generated during operation at the corners where the permanent magnets face the stator. The rotor can be effectively cooled by at least one magnetohydrodynamic temperature control component integrated into it. Furthermore, hot spots at the corners of the permanent magnets of the rotor facing the stator in a permanent magnet-excited synchronous motor can be effectively avoided.

[0015] In another advantageous design of the motor, the heat sink can be a cooling channel through which coolant can be conducted. Here, the cooling channel can be integrated, for example, into the rotor shaft.

[0016] In another advantageous design of the motor, the closed channel system can have at least two channels fluidly connected in parallel and / or at least two channels fluidly connected in series. This means that the closed channel system can include multiple channels fluidly connected in parallel, multiple channels fluidly connected in series, or a combination of multiple channels fluidly connected in parallel and channels fluidly connected in series. Therefore, at least one magnetohydrodynamic pump module can be arranged, for example, on a channel section that is fluidly connected to multiple channels fluidly connected in parallel at both ends. Thus, the magnetohydrodynamic pump module can accelerate the flow of a conductive and thermally conductive medium through the multiple channels fluidly connected in parallel.

[0017] In another advantageous design of the motor, at least two magnetohydrodynamic (MHD) pump modules can be fluidly arranged in parallel on at least two fluidly connected parallel channels, and / or fluidly arranged in series on at least two fluidly connected series channels. This means that the MHD pump modules can be arranged on multiple fluidly connected parallel channels or fluidly connected series channels, respectively. Therefore, a first MHD pump module can be arranged, for example, on a first channel, and a second MHD pump module can be arranged on a second channel, which is fluidly connected in parallel with the first channel. Thus, the two MHD pump modules respectively accelerate the conductive and thermally conductive medium in their respective channels. Alternatively, the first MHD pump module can be arranged, for example, on a channel segment that is fluidly connected at one end to multiple fluidly connected parallel channels, and the second MHD pump module can be arranged on a channel segment that is fluidly connected at one end to multiple fluidly connected parallel channels. Thus, the two fluidly connected series MHD pump modules can jointly accelerate the conductive and thermally conductive medium in the multiple fluidly connected parallel channels. Furthermore, at least two magnetohydrodynamic (MHD) pump modules can be arranged in series in fluid configuration on a common channel of the channel system, and collectively accelerate the conductive and thermally conductive medium within the common channel. Moreover, using multiple MHD pump modules allows for a smaller structural design for each module. Due to the compact structure of each MHD pump module and the use of multiple modules, existing structural space can be variably utilized and better than when using a single large MHD pump module.

[0018] In another advantageous design of the motor, at least two magnetohydrodynamic pump modules can be electrically connected in parallel or in series. Compared to a single pump module, the required current can be significantly reduced at the same voltage by electrically connecting multiple pump modules in series. Compared to known systems with only a single pump module, the series connection of at least two pump modules also reduces electrical losses in the conductive and heat-conducting medium and in the power supply lines of the magnetohydrodynamic pump modules, thereby improving efficiency. Furthermore, depending on the structure of the associated closed channel system, the corresponding channels or areas of the motor can be individually temperature-controlled as needed, thereby achieving uniform cooling or heating and uniform temperature distribution on the stator and / or rotor of the motor. This results in less mechanical stress and heat flow. Because each pump module can be implemented very small, any channel structure can be individually temperature-controlled with respect to at least one channel by means of the associated pump module, so that the corresponding sections of the stator and / or rotor can be optimally temperature-controlled. This can significantly improve the service life of the motor. Attached Figure Description

[0019] Embodiments of the present invention are illustrated in the accompanying drawings and explained in detail in the following description. In the drawings, the same reference numerals denote parts or elements that perform the same or similar functions.

[0020] Figure 1 A schematic cross-sectional view of an embodiment of the motor according to the present invention is shown.

[0021] Figure 2 A diagram showing the method of use according to the invention Figure 1 A schematic equivalent circuit diagram of the rotor of the motor in the first embodiment.

[0022] Figure 3 A diagram showing the method of use according to the invention Figure 1 A schematic equivalent circuit diagram of the rotor of the motor in a second embodiment.

[0023] Figure 4 A diagram showing the method of use according to the invention Figure 1 A schematic equivalent circuit diagram of the rotor of the motor in the third embodiment.

[0024] Figure 5 A diagram showing the method of use according to the invention Figure 1 A schematic equivalent circuit diagram of the rotor of the motor in the fourth embodiment.

[0025] Figure 6 A schematic cross-sectional view of a segment of an embodiment of the rotor of a synchronous motor according to the present invention, used for implementation as a permanent magnet excited synchronous motor, is shown. Detailed Implementation

[0026] As from Figures 1 to 6As can be seen, the illustrated embodiment of the motor 1 according to the invention includes a stator 3, a rotor 5, at least one motor winding 6, and at least one magnetohydrodynamic (MHD) temperature control assembly 10 integrated in the stator 3 and / or rotor 5. The at least one MHD temperature control assembly 10 includes at least one enclosed channel system 14 and at least one MHD pump module 12. The channel system has at least one channel 14A for guiding a conductive and thermally conductive medium 16 and is thermally coupled to the stator 3 and / or rotor 5. The MHD pump module includes an electrode arrangement 18 and implements the conduction of a current IP through the electrode arrangement 18 through at least one channel segment 14.1 through the conductive and thermally conductive medium 16 and generates a Lorentz force FL using a magnetic field B generated in the stator 3 and / or rotor 5. This Lorentz force specifically accelerates the conductive and thermally conductive medium 16 in at least one channel segment 14.1, and the resulting pressure increase achieves a desired volumetric flow rate of the conductive and thermally conductive medium 16 through at least one channel 14A of the enclosed channel system 14. Here, at least one magnetohydrodynamic pump module 12 is implemented and positioned such that the electrode device 18 conducts the current IP perpendicular to the direction of the field lines of the magnetic field B and perpendicular to at least one channel segment 14.1 through the conductive and thermally conductive medium 16, and at least one channel segment 14.1 is oriented perpendicular to the direction of the field lines of the magnetic field B.

[0027] As from Figure 1 As can be seen further, in the illustrated embodiment of motor 1, a plurality of magnetohydrodynamic temperature control components 10 are integrated in the rotor 5 of motor 1, of which two temperature control components are visible.

[0028] Here, the enclosed channel system 14 of the temperature control assembly 10 may have at least two fluidly connected parallel channels 14A and / or at least two fluidly connected series channels 14A. Therefore, the enclosed channel system 14 may, for example, include only fluidly connected parallel channels 14A or only fluidly connected series channels 14A. Alternatively, the enclosed channel system may include a combination of fluidly connected parallel channels 14A and fluidly connected series channels 14A.

[0029] As from Figures 2 to 5 As can be seen further, the electrode device 18 of at least one magnetohydrodynamic pump module 12 includes two electrodes 18A and 18B. Here, the first electrode 18A of the electrode device 18 introduces a current IP with a preset current density into a conductive and thermally conductive medium 16 at at least one channel segment 14.1, and the second electrode 18B of the electrode device 18 extracts the current IP from the conductive and thermally conductive medium 16 at at least one channel segment 14.1.

[0030] As from Figures 2 to 5As can be seen further, in the illustrated embodiment of rotor 5, the current IP for at least one magnetohydrodynamic pump module 12 can be drawn from at least one power branch of at least one motor winding 6 of motor 1 (here rotor 5) to the electrode device 18 of at least one magnetohydrodynamic pump module 12.

[0031] In an alternative embodiment of motor 1 (not shown), the current IP for at least one magnetohydrodynamic pump module 12 can be conducted to the electrode device 18 of at least one magnetohydrodynamic pump module 12 via an additional inlet device.

[0032] As from Figure 2 As can be further seen, in the first embodiment of rotor 5A shown, the illustrated magnetohydrodynamic temperature control assembly 10A includes a magnetohydrodynamic pump module 12, which is electrically connected in parallel with at least one motor winding 6. This means that the current in the power branch is divided into a current IP for the magnetohydrodynamic pump module 12 and a current IM for the at least one motor winding 6.

[0033] As from Figure 3 As can be further seen, in the second embodiment of rotor 5B shown, the illustrated magnetohydrodynamic temperature control assembly 10B includes a magnetohydrodynamic pump module 12, which is electrically connected in series with at least one motor winding 6. This means that the current in the power branch is equal to the current IP for the magnetohydrodynamic pump module 12 and equal to the current IM for the at least one motor winding 6.

[0034] As from Figure 4 As can be further seen, in the third embodiment of rotor 5C, the illustrated magnetohydrodynamic temperature control assembly 10C includes a magnetohydrodynamic pump module 12 that draws voltage from at least one motor winding 6. Therefore, the magnetohydrodynamic pump module 12 is electrically connected in parallel with the upper winding section 6.1 of the at least one motor winding 6, and the parallel circuit consisting of the magnetohydrodynamic pump module 12 and the upper winding section 6.1 of the at least one motor winding 6 is electrically connected in series with the lower winding section 6.2 of the at least one motor winding 6. This means that the current in the power branch of the parallel circuit consisting of the magnetohydrodynamic pump module 12 and the upper winding section 6.1 of the at least one motor winding 6 is divided into a current IP for the magnetohydrodynamic pump module 12 and a current IM for the at least one motor winding 6. After the parallel circuit consisting of the magnetohydrodynamic pump module 12 and the winding section 6.1 above at least one motor winding 6, a total current consisting of the current IP for the magnetohydrodynamic pump module 12 and the current IM for at least one motor winding 6 flows through the winding section 6.2 below at least one motor winding 6.

[0035] As from Figure 5As can be further seen in the fourth embodiment of rotor 5D, the illustrated magnetohydrodynamic temperature control assembly 10D includes two magnetohydrodynamic pump modules 12A and 12B, which are arranged in series in fluid connection on a common channel 14A of the enclosed channel system 14, and jointly accelerate the conductive and thermally conductive medium 16 in the common channel 14A. Here, the two magnetohydrodynamic pump modules 12A and 12B are electrically connected in series with at least one motor winding 6. This means that the current in the power branch is equal to the current IP for the first magnetohydrodynamic pump module 12A, equal to the current IP for the second magnetohydrodynamic pump module 12B, and equal to the current IM for at least one motor winding 6.

[0036] In an alternative embodiment (not shown), two magnetohydrodynamic pump modules 12A and 12B are electrically connected in parallel. Alternatively, multiple magnetohydrodynamic pump modules 12A and 12B may be arranged sequentially in fluid series on multiple fluidly parallel channels 14A of the enclosed channel system 14, and collectively accelerate the conductive and thermally conductive medium 16 in the common channel 14A.

[0037] As from Figure 1 As can be further seen, at least one channel 14A of the enclosed channel system 14 of the two illustrated magnetohydrodynamic temperature control components 10 is thermally coupled to at least one heat source (not shown in detail) in at least one section. At least one channel 14A of the two illustrated magnetohydrodynamic temperature control components 10A is thermally coupled to a heat sink of a cooling channel 7 implemented axially in at least one other section through which coolant 9 can be conducted. The channel 14A of the upper illustrated magnetohydrodynamic temperature control component 10 in the lower illustrated section is thermally coupled to the cooling channel 7 along its entire illustrated length. Furthermore, the channel 14A of the lower illustrated magnetohydrodynamic temperature control component 10 in the upper illustrated section is thermally coupled to the cooling channel 7 along its entire illustrated length. Thus, the volumetric flow rate of the conductive and thermally conductive medium 16 in the enclosed channel system 14 of the two illustrated magnetohydrodynamic temperature control components 10 absorbs heat generated on at least one heat source (not shown in detail) from at least one heat source via convective heat transfer and transfers said heat to the coolant 9 guided in the cooling channel 7. Because at least one channel 14 can be directed to any location, temperature regulation can be achieved at any point on the motor 1. Preferably, at least one section of at least one channel 14 that is thermally coupled to the heat source is magnetically shielded.

[0038] As from Figure 6 As can be further seen, in the illustrated embodiment of the rotor 5E in the synchronous motor 1, which is implemented as a permanent magnet excitation synchronous motor, the heat source corresponds to the permanent magnet 5.1, at the corner of the permanent magnet facing the stator 3, where high temperatures can be generated during operation. (As from...) Figure 6As can be further seen, the channel 14A of at least one magnetohydrodynamic temperature control component integrated in the rotor 5E is arranged at the corner region of the permanent magnet 5.1, so that the high temperature generated during operation can be efficiently discharged. This effectively avoids hot spots at the corner of the permanent magnet 5.1 of the rotor 5E facing the stator 3.

Claims

1. An electric motor (1) having a stator (3), a rotor (5), at least one motor winding (6), and at least one magnetohydrodynamic temperature control assembly (10), the magnetohydrodynamic temperature control assembly being integrated in the stator (3) and / or the rotor (5), wherein, The at least one magnetohydrodynamic temperature control assembly (10) includes at least one enclosed channel system (14) and at least one magnetohydrodynamic pump module (12). The channel system has at least one channel (14A) for guiding a conductive and thermally conductive medium (16) and is thermally coupled to the stator (3) and / or the rotor (5). The magnetohydrodynamic pump module includes an electrode device (18) and is configured to conduct current (IP) through the conductive and thermally conductive medium (16) at at least one channel segment (14.1) via the electrode device (18) and generate a Lorentz force (FL) using a magnetic field (B) generated in the stator (3) and / or the rotor (5). The force is specifically accelerated in the at least one channel segment (14.1) of the conductive and thermally conductive medium (16), and the resulting pressure increase achieves the desired volumetric flow rate of the conductive and thermally conductive medium (16) through at least one channel (14A) of the closed channel system (14), wherein the at least one magnetohydrodynamic pump module (12) is implemented and positioned such that the electrode device (18) conducts the current (IP) perpendicular to the direction of the field lines of the magnetic field (B) and perpendicular to the at least one channel segment (14.1) through the conductive and thermally conductive medium (16), and the at least one channel segment (14.1) is oriented perpendicular to the direction of the field lines of the magnetic field (B).

2. The motor (1) according to claim 1, characterized in that, The electrode device (18) includes two electrodes (18A, 18B), wherein the first electrode (18A) of the electrode device (18) introduces a current (IP) with a preset current density into the conductive and thermally conductive medium (16) at at least one channel segment (14.1), and the second electrode (18B) of the electrode device (18) extracts the current (IP) from the conductive and thermally conductive medium (16) at at least one channel segment (14.1).

3. The motor (1) according to claim 1 or 2, characterized in that, The current (IP) for the magnetohydrodynamic pump module (12) can be drawn from at least one power branch of at least one motor winding (6) of the motor (1) to the electrode device (18) of the at least one magnetohydrodynamic pump module (12), or guided to the electrode device (18) of the at least one magnetohydrodynamic pump module (12) by an additional inlet device.

4. The motor (1) according to claim 3, characterized in that, The at least one magnetohydrodynamic pump module (12) is electrically connected in parallel or in series with the at least one motor winding (6).

5. The motor (1) according to claim 3 or 4, characterized in that, The at least one magnetohydrodynamic pump module (12) draws voltage from the at least one motor winding (6).

6. The motor (1) according to any one of claims 1 to 5, characterized in that, The at least one channel (14A) of the closed channel system (14) is thermally coupled to at least one heat source in at least one section and to at least one heat sink in at least one other section.

7. The motor (1) according to claim 6, characterized in that, The volumetric flow rate of the conductive and thermally conductive medium (16) in the closed channel system (14) absorbs heat generated on the at least one heat source through convective heat transfer, and transfers the heat to the at least one heat sink, thereby cooling the heat source.

8. The motor (1) according to claim 6 or 7, characterized in that, The at least one section of the at least one channel (14A) that is thermally coupled to the heat source is magnetically shielded.

9. The motor (1) according to any one of claims 6 to 8, characterized in that, The at least one heat source is the permanent magnet (5.1) of the rotor (5), which generates high temperature at the corner of the permanent magnet facing the stator (3).

10. The motor (1) according to any one of claims 6 to 9, characterized in that, The heat sink is a cooling channel (7), through which coolant (9) can be conducted.

11. The motor (1) according to any one of claims 1 to 10, characterized in that, The closed channel system (14) has at least two fluid parallel channels (14A) and / or at least two fluid series channels (14A).

12. The motor (1) according to claim 11, characterized in that, At least two magnetohydrodynamic pump modules (12) are arranged in parallel fluid configuration at at least two fluid parallel-connected channels (14A), and / or in series fluid configuration at at least two fluid series-connected channels (14A).

13. The motor (1) according to any one of claims 1 to 12, characterized in that, At least two magnetohydrodynamic pump modules (12) are arranged in series in fluid mode at a common channel (14A) of the channel system (14) and together accelerate the conductive and thermally conductive medium (16) in the common channel (14A).

14. The motor (1) according to claim 12 or 13, characterized in that, The at least two magnetohydrodynamic pump modules (12) are connected in parallel or in series.

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