CN211579851U - Inner rotor for cylinder type permanent magnet speed regulator and cylinder type permanent magnet speed regulator - Google Patents

Abstract

The utility model relates to an inner rotor for a barrel-type permanent magnet governor and a barrel-type permanent magnet governor. The inner rotor for a barrel-type permanent magnet governor comprises an inner rotor body, and a centrifugal flow channel is arranged in the inner rotor body. , the outlet of the centrifugal flow channel is located on the radial outer peripheral surface of the inner rotor body; when in use, the outer rotor is used in conjunction with the inner rotor for the cylindrical permanent magnet governor. The outer rotor is provided with an accommodating cavity, the inner rotor is installed in the accommodating cavity, and the radial outer peripheral surface of the inner rotor body and the inner wall of the accommodating cavity are spaced to form an air gap. Since the outlet of the centrifugal flow channel is located on the radial outer peripheral surface of the inner rotor body, the outlet of the centrifugal flow channel is opposite to the inner wall of the accommodating cavity, that is, the centrifugal flow channel can directly communicate with the air gap through its outlet. Since the outlet of the centrifugal flow channel is located on the radial outer peripheral surface of the inner rotor body, the cooling liquid in the centrifugal flow channel can flow into the air gap by using the centrifugal force it receives, and the cooling liquid entering the air gap will exchange heat with the inner rotor and outer rotor before out of the air gap.

Description

Inner rotor for barrel permanent magnet governor and barrel permanent magnet governor

technical field

The utility model relates to the technical field of permanent magnet speed regulation, in particular to an inner rotor for a cylindrical permanent magnet speed governor and a cylindrical permanent magnetic speed governor.

Background technique

The barrel-type permanent magnet governor is a transmission device that transmits torque through an air gap. The existing barrel-type permanent magnet governor is mainly composed of an induction rotor and a permanent magnet rotor. The induction rotor is fixed on the driving shaft and connected with the motor end; the permanent magnet rotor is fixed on the load shaft and connected with the load. There is a gap between the induction rotor and the permanent magnet rotor. In this way, the connection between the motor and the load will change from the original mechanical connection to a magnetic connection. By adjusting the air gap distance or area between the permanent magnet rotor and the induction rotor, the output torque on the load shaft can be changed, thereby adjusting the load speed.

However, as the model of the barrel-type permanent magnet governor becomes larger and larger, the heat generated by the barrel-type permanent magnet governor during operation becomes more and more, and the heat dissipation efficiency of the general barrel-type permanent magnet governor can no longer meet the actual requirements. The heat generated is dissipated.

Utility model content

Based on this, the present invention overcomes the defects of the prior art, and provides an inner rotor for a barrel-type permanent magnet governor and a barrel-type permanent magnet governor to solve the problem of insufficient heat dissipation efficiency.

An inner rotor for a barrel-type permanent magnet governor comprises an inner rotor body, wherein a centrifugal flow channel is arranged in the inner rotor body, and the outlet of the centrifugal flow channel is located on the radial outer peripheral surface of the inner rotor body.

When using the inner rotor for the above-mentioned cylindrical permanent magnet governor, the outer rotor is used together with the inner rotor for the cylindrical permanent magnet governor. The outer rotor is provided with an accommodating cavity, the inner rotor is installed in the accommodating cavity, and the radial outer peripheral surface of the inner rotor body and the inner wall of the accommodating cavity are spaced to form an air gap. Since the outlet of the centrifugal flow channel is located on the radial outer peripheral surface of the inner rotor body, the outlet of the centrifugal flow channel is opposite to the inner wall of the accommodating cavity, that is, the centrifugal flow channel can directly communicate with the air gap through its outlet. Since the outlet of the centrifugal flow channel is located on the radial outer peripheral surface of the inner rotor body, the cooling liquid in the centrifugal flow channel can flow into the air gap by using the centrifugal force it receives, and the cooling liquid entering the air gap will exchange heat with the inner rotor and outer rotor before out of the air gap. By changing the way in which the coolant enters the air gap, the problem of insufficient heat dissipation efficiency of the cartridge-type permanent magnet governor caused by the small size of the air gap in the radial direction of the inner rotor and the limited flow of the coolant entering the air gap is solved.

In one of the embodiments, there are at least two centrifugal flow channels, and the outlets of the at least two centrifugal flow channels are distributed at intervals around the circumference of the axis of the inner rotor body. Through the outlets of the centrifugal flow channels distributed circumferentially around the axis of the inner rotor body, the cooling liquid can enter the air gap from multiple positions on the radial outer peripheral surface of the inner rotor body, so that the uniform distribution of the cooling liquid in the circumferential direction of the inner rotor body can be improved. Therefore, the uniformity of the cooling liquid to the cylindrical permanent magnet governor can be improved in the circumferential direction of the axis of the inner rotor body.

In one embodiment, the centrifugal flow channel includes at least two holes, the at least two holes are opened on the radial outer peripheral surface of the inner rotor body, and the at least two holes are distributed along the axis of the inner rotor body at intervals. Through at least two holes distributed at intervals along the axis of the inner rotor body, the cooling liquid can enter the air gap from multiple positions in the axis direction of the inner rotor body, which is beneficial to improve the cooling liquid in the axis direction of the inner rotor body. Magnetic governor cooling uniformity.

In one embodiment, the inner rotor body is provided with a centrifugal liquid accumulation chamber; the centrifugal liquid accumulation chamber is communicated with the inlet of the centrifugal flow channel to supply cooling liquid to the centrifugal flow channel. Under the action of centrifugation, the cooling liquid accumulated in the centrifugal liquid accumulation chamber flows into the centrifugal flow channel from the inlet of the centrifugal flow channel. The cooling liquid is collected in the centrifugal liquid accumulation chamber, and the centrifugal liquid accumulation chamber can continuously supply the cooling liquid to the centrifugal flow channel.

In one of the embodiments, there are at least two centrifugal flow channels, and the outlets of the at least two centrifugal flow channels are distributed at intervals around the circumference of the axis of the inner rotor body; there are at least two centrifugal fluid accumulation chambers, so The at least two centrifugal liquid accumulation chambers are distributed at intervals around the circumference of the axis of the inner rotor body; any one of the centrifugal liquid accumulation chambers is communicated with the inlet of at least one centrifugal flow channel. This is beneficial to shorten the path of the centrifugal flow channel and reduce the flow resistance of the coolant.

In one of the embodiments, along the direction of the axis of the inner rotor body, the inner rotor body has a first end portion and a second end portion opposite to each other; the first end portion is provided with an outer circumference around the axis of the inner rotor body. The diversion perimeter, the inner diameter of the diversion perimeter near the first end is larger than the inner diameter of the diversion perimeter away from the first end; the inner peripheral surface of the diversion perimeter and the outer surface of the first end form a centrifugal A diversion cavity, the inner wall of the centrifugal diversion cavity is provided with a liquid supply port that communicates with the centrifugal diversion cavity and the centrifugal liquid accumulation cavity. The cooling liquid affected by the first end will perform centrifugal motion relative to the axis of the inner rotor body. After the cooling liquid in centrifugal motion enters the centrifugal diversion cavity, the cooling liquid will follow the inner wall of the centrifugal diversion cavity from the liquid supply under the action of centrifugal force. into the centrifugal effusion chamber. The use of the guide edge can reduce the proportion of the cooling liquid flowing in the direction away from the liquid supply port, thereby increasing the proportion of the cooling liquid flowing into the centrifugal liquid accumulation chamber.

In one of the embodiments, along the direction of the axis of the inner rotor body, the projection of the surrounding edge of the flow guide shields the liquid supply port. This is beneficial for the cooling liquid in the centrifugal guide cavity to flow into the liquid supply port.

In one of the embodiments, the flow guide perimeter includes a radial flow guide rim and an axial flow guide rim. The radial guide surrounding edge surrounds the outer circumference of the axis of the inner rotor body, one end of the radial guide surrounding edge is arranged on the first end, and the other end of the radial guide surrounding edge is directed away from the first end. extend. The axial flow-guiding edge surrounds the outer circumference of the axis of the inner rotor body, one side of the axial flow-guiding edge is connected to the end of the radial flow-guiding edge that is far away from the first end, and the axial flow-guiding edge is The other side extends close to the axis of the inner rotor body.

In one of the embodiments, the radial flow guide surrounding edge is provided with a connection table, and the connection table is provided with a first connection hole; the axial flow guide surrounding edge is provided with a connection table corresponding to the first connection hole The second connecting hole, the first connecting hole and the second connecting hole are provided with fasteners. Simple structure, easy to process and install.

A barrel-type permanent magnet governor, comprising an outer rotor and an inner rotor for a barrel-type permanent magnet governor in any of the above embodiments; the outer rotor is provided with a accommodating cavity; the inner rotor is installed in the accommodating cavity Inside, the radial outer peripheral surface of the inner rotor body is spaced and matched with the inner wall of the accommodating cavity to form an air gap.

In the above-mentioned cylindrical permanent magnet governor, when the cylindrical permanent magnet governor is cooled, the cooling liquid fed into the centrifugal flow channel will flow along the centrifugal flow channel and directly enter the air gap from the outlet of the centrifugal flow channel. Since the outlet of the centrifugal flow channel is located on the radial outer peripheral surface of the inner rotor body, the cooling liquid in the centrifugal flow channel can flow into the air gap by using the centrifugal force it receives, and the cooling liquid entering the air gap will exchange heat with the inner rotor and outer rotor before out of the air gap. This changes the way the coolant enters the air gap, and solves the problem of insufficient heat dissipation efficiency of the cylindrical permanent magnet governor due to the small size of the air gap in the radial direction of the inner rotor, which causes the limited flow of the coolant entering the air gap. .

Description of drawings

1 is an exploded view of an inner rotor and an outer rotor according to an embodiment;

FIG. 2 is an assembly diagram of an inner rotor and an outer rotor according to an embodiment;

Fig. 3 is the partial enlarged view of A place in Fig. 2;

4 is a partial cross-sectional view of the inner rotor according to an embodiment;

5 is an exploded view of the inner rotor according to an embodiment;

Fig. 6 is a partial enlarged view at B in Fig. 5;

7 is a cross-sectional view of an inner rotor according to an embodiment.

Description of reference numerals: 10, inner rotor, 100, inner rotor body, 101, inner rotor body axis, 102, first end, 103, second end, 110, centrifugal flow channel, 111, orifice, 120, centrifugal Fluid accumulation chamber, 130, guide edge, 131, radial guide edge, 131a, connection table, 131b, first connection hole, 132, axial flow guide edge, 132a, second connection hole, 133, tight Firmware, 140, centrifugal guide cavity, 141, liquid supply port, 20, outer rotor, 210, accommodating cavity, 30, air gap.

Detailed ways

In order to facilitate the understanding of the present utility model, the present utility model will be more fully described below with reference to the related drawings. The preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure is provided.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to FIGS. 1 , 2 and 3 , the barrel-type permanent magnet governor includes an outer rotor 20 and an inner rotor 10 that are matched by magnetic induction. The outer rotor 20 is provided with a accommodating cavity 210 , and the inner rotor 10 is installed in the accommodating cavity 210 Inside; the inner wall of the accommodating cavity 210 cooperates with the radial outer peripheral surface of the inner rotor 10 to form an air gap 30 .

Generally, the cooling method of the barrel type permanent magnet governor is: along the axis 101 of the inner rotor body, the cooling liquid is transported from one side of the air gap 30 to the other side of the air gap 30 (not shown in the figure). However, since the size of the air gap 30 in the radial direction of the inner rotor 10 is about 4 mm to 12 mm, and there is a speed difference between the inner rotor 10 and the outer rotor 20, it is difficult for the cooling liquid to enter the air gap 30, so that the cylindrical permanent magnet governor The heat dissipation efficiency of the barrel type permanent magnet governor is limited, so the problem of insufficient heat dissipation efficiency of the barrel type permanent magnet governor occurs.

Embodiment 1:

3 and 4, in one embodiment, an inner rotor 10 for a cylindrical permanent magnet governor includes an inner rotor body 100, and a centrifugal flow channel 110 is provided in the inner rotor body 100. The outlet of the flow channel 110 is located on the radially outer peripheral surface of the inner rotor body 100 .

The above-mentioned inner rotor 10 for a barrel-type permanent magnet governor is shown in conjunction with FIG. 1 , FIG. 2 and FIG. 3 , when in use, the outer rotor 20 is used in conjunction with the inner rotor 10 for a barrel-type permanent magnet governor. The outer rotor 20 is provided with an accommodating cavity 210 , and the inner rotor 10 is installed in the accommodating cavity 210 . Since the outlet of the centrifugal flow channel 110 is located on the radial outer peripheral surface of the inner rotor body 100 , the outlet of the centrifugal flow channel 110 is opposite to the inner wall of the accommodating cavity 210 , that is, the centrifugal flow channel 110 can directly communicate with the air gap 30 through its outlet.

When cooling the cylindrical permanent magnet governor, the cooling liquid sent into the centrifugal flow channel 110 will flow along the centrifugal flow channel 110 and directly enter the air gap 30 from the outlet of the centrifugal flow channel 110 . Since the outlet of the centrifugal flow channel 110 is located on the radial outer peripheral surface of the inner rotor body 100 , the cooling liquid in the centrifugal flow channel 110 can flow into the air gap 30 by the centrifugal force it receives, and the cooling liquid entering the air gap 30 is in contact with the inner rotor 10 . After heat exchange with the outer rotor 20, it flows out of the air gap 30. By changing the way in which the cooling liquid enters the air gap 30 , the cooling efficiency of the cartridge-type permanent magnet governor is solved due to the small size of the air gap 30 in the radial direction of the inner rotor 10 , which causes the limited flow of the cooling liquid entering the air gap 30 . insufficient problem.

5 and 6 , in one embodiment, there are at least two centrifugal flow channels 110 , and the outlets of the at least two centrifugal flow channels 110 are distributed at intervals around the circumference of the axis 101 of the inner rotor body.

Through the outlets of the centrifugal flow channels 110 circumferentially distributed around the axis 101 of the inner rotor body, the cooling liquid can enter the air gap 30 from multiple positions on the radial outer peripheral surface of the inner rotor body 100 , so that the cooling liquid can be raised in the inner rotor body 100 The uniformity of the circumferential distribution can further improve the uniformity of the cooling liquid to the cylindrical permanent magnet governor in the circumferential direction of the axis 101 of the inner rotor body.

Specifically, the number of the centrifugal flow channels 110 is multiple, and the outlets of the centrifugal flow channels 110 are evenly distributed in the circumferential direction of the axis 101 of the inner rotor body.

5 and 6, in one embodiment, the centrifugal flow channel 110 includes at least two holes 111, the at least two holes 111 are opened on the radial outer peripheral surface of the inner rotor body 100, the at least two holes 111 The two holes 111 are spaced apart along the axis 101 of the inner rotor body.

Through the at least two orifices 111 distributed at intervals along the axis 101 of the inner rotor body, the cooling liquid can enter the air gap 30 from multiple positions in the direction of the axis 101 of the inner rotor body, thereby facilitating cooling in the direction of the axis 101 of the inner rotor body. Uniformity of liquid to barrel permanent magnet governor cooling.

It should be noted that, in the previous embodiment, the centrifugal flow channel 110 includes at least two holes 111 distributed at intervals along the axis 101 of the inner rotor body. Of course, in other embodiments, the opening of the centrifugal flow channel 110 is in the shape of a flat slot, and the length direction of the opening is arranged along the direction of the axis 101 of the inner rotor body.

3 and 4 , in one embodiment, the inner rotor body 100 is provided with a centrifugal fluid accumulation chamber 120 ; the centrifugal fluid accumulation chamber 120 communicates with the inlet of the centrifugal flow channel 110 to supply the centrifugal flow channel 110 Coolant.

The cooling liquid accumulated in the centrifugal liquid accumulation chamber 120 flows into the centrifugal flow channel 110 from the inlet of the centrifugal flow channel 110 under the action of centrifugation. The centrifugal liquid accumulation chamber 120 collects the cooling liquid, and the centrifugal liquid accumulation chamber 120 can continuously supply the cooling liquid to the centrifugal flow channel 110 .

Of course, in other embodiments, the inlet of the centrifugal flow channel 110 may also be communicated with the cooling liquid storage tank, and the cold zone liquid in the cooling liquid storage tank flows into the centrifugal flow channel 110 by utilizing gravitational potential energy. Alternatively, the inlet of the centrifugal flow channel 110 is communicated with the supercharger, and the cooling liquid in the supercharger flows into the centrifugal flow channel 110 by virtue of the pressure exerted on it by the supercharger.

5 and 6, in one embodiment, there are at least two centrifugal flow channels 110, and the outlets of the at least two centrifugal flow channels 110 are distributed at intervals around the circumference of the axis 101 of the inner rotor body; the There are at least two centrifugal fluid accumulation chambers 120, and the at least two centrifugal fluid accumulation chambers 120 are distributed at intervals around the inner rotor body axis 101; any one of the centrifugal fluid accumulation chambers 120 and the inlet of at least one centrifugal flow channel 110 Connected. This is beneficial to shorten the path of the centrifugal flow channel 110 and reduce the flow resistance of the cooling liquid.

2 and 5 , specifically, there are multiple centrifugal fluid accumulation chambers 120 , and the multiple centrifugal fluid accumulation chambers 120 are distributed at intervals around the circumference of the axis 101 of the inner rotor body; there are multiple centrifugal fluid passages 110 . The centrifugal flow channel 110 is spaced to one side of the centrifugal fluid collection chamber 120 away from the axial direction of the inner rotor 10 . And the inlet of the centrifugal flow channel 110 is located on the side of the inner wall of the centrifugal liquid accumulation chamber 120 away from the axis 101 of the inner rotor body.

1 , 2 , 5 , 6 and 7 , in one embodiment, along the direction of the inner rotor body axis 101 , the inner rotor body 100 has a first end 102 and a second end opposite to each other part 103; the first end 102 is provided with a guide edge 130 surrounding the outer circumference of the axis 101 of the inner rotor body, and the inner diameter D2 of the guide edge 130 close to the first end 102 is larger _than the guide edge 130 is away from the inner diameter D ₁ of the first end portion 102 ; the inner peripheral surface of the guide edge 130 and the outer surface of the first end portion 102 form a centrifugal guide cavity 140 , and the inner wall of the centrifugal guide cavity 140 is provided with a centrifugal guide cavity 140 . The liquid supply port 141 of the centrifugal diversion chamber 140 and the centrifugal liquid accumulation chamber 120 is communicated.

The cooling liquid affected by the first end 102 will perform centrifugal motion relative to the axis 101 of the inner rotor body. After the cooling liquid entering the centrifugal guiding chamber 140 as a centrifugal motion, the cooling liquid will follow the centrifugal force of the centrifugal guiding chamber 140 under the action of centrifugal force. The inner wall flows into the centrifugal liquid accumulation chamber 120 from the liquid supply port 141 . Using the guide edge 130 can reduce the proportion of the cooling liquid flowing in the direction away from the liquid supply port 141 , thereby increasing the proportion of the cooling liquid flowing into the centrifugal liquid accumulation chamber 120 .

In one embodiment, along the direction of the axis 101 of the inner rotor body, the projection of the guide edge 130 blocks the liquid supply port 141 . This facilitates the cooling liquid in the centrifugal guide cavity 140 to flow into the liquid supply port 141 .

Referring to FIG. 4 and FIG. 6 , in one embodiment, the flow guide surrounding edge 130 includes a radial flow guide surrounding edge 131 and an axial flow guide surrounding edge 132 . The radial guide edge 131 surrounds the outer circumference of the axis 101 of the inner rotor body, one end of the radial guide edge 131 is disposed on the first end portion 102, and the other end of the radial guide edge 131 faces away from the first end portion 102. The direction of one end portion 102 extends. The axial guide edge 132 surrounds the outer circumference of the axis 101 of the inner rotor body, and one side of the axial guide edge 132 is connected to the end of the radial guide edge 131 away from the first end 102. The other side of the guide surrounding edge 132 extends in a direction close to the axis 101 of the inner rotor body.

Referring to FIG. 6 , in one embodiment, the radial flow guide surrounding edge 131 is provided with a connection table 131 a , and the connection table 131 a is provided with a first connection hole 131 b ; A second connection hole 132a corresponding to the first connection hole 131b is provided, and a fastener 133 is passed through the first connection hole 131b and the second connection hole 132a. Simple structure, easy to process and install.

Specifically, the connecting platform 131a is disposed on the side of the radial flow guiding peripheral edge 131 close to the axis 101 of the inner rotor body. Of course, in other embodiments, the connecting platform 131a may also be disposed on the side away from the axis of the inner rotor 10 from the radial flow guiding peripheral edge 131 .

Embodiment 2:

1 , 2 and 3 , a cylindrical permanent magnet governor includes an outer rotor 20 and the inner rotor 10 for a cylindrical permanent magnet governor in any of the above embodiments; the outer rotor 20 An accommodating cavity 210 is provided; the inner rotor 10 is installed in the accommodating cavity 210 , and the radial outer peripheral surface of the inner rotor body 100 cooperates with the inner wall of the accommodating cavity 210 to form an air gap 30 .

The barrel-type permanent magnet governor includes an inner rotor 10 and an outer rotor 20 . The outer rotor 20 is provided with an accommodating cavity 210 , and the inner rotor 10 is installed in the accommodating cavity 210 . Since the outlet of the centrifugal flow channel 110 is located on the radial outer peripheral surface of the inner rotor body 100 , the outlet of the centrifugal flow channel 110 is opposite to the inner wall of the accommodating cavity 210 , that is, the centrifugal flow channel 110 can directly communicate with the air gap 30 through its outlet.

When cooling the cylindrical permanent magnet governor, the cooling liquid sent into the centrifugal flow channel 110 will flow along the centrifugal flow channel 110 and directly enter the air gap 30 from the outlet of the centrifugal flow channel 110 . Since the outlet of the centrifugal flow channel 110 is located on the radial outer peripheral surface of the inner rotor body 10 , the cooling liquid in the centrifugal flow channel 110 can flow into the air gap 30 by the centrifugal force it receives, and the cooling liquid entering the air gap 30 is in contact with the inner rotor 10 . After heat exchange with the outer rotor 20, it flows out of the air gap 30. In this way, the way in which the cooling liquid enters the air gap 30 is changed, and the heat dissipation of the cylindrical permanent magnet governor is solved due to the small size of the air gap 30 in the radial direction of the inner rotor 10, which causes the limited flow of the cooling liquid entering the air gap 30. The problem of inefficiency.

It should be noted that one of the inner rotor 10 and the outer rotor 20 is a permanent magnet rotor, and the other of the inner rotor 10 and the outer rotor 20 is an induction rotor.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present utility model, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the utility model patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for this utility model shall be subject to the appended claims.

Claims (10)

1. an inner rotor for a cylindrical permanent magnet governor, characterized in that it comprises an inner rotor body, and the inner rotor body is provided with a centrifugal flow channel, and the outlet of the centrifugal flow channel is located at the radial outer circumference of the inner rotor body face. 2 . The inner rotor for a cylindrical permanent magnet governor according to claim 1 , wherein there are at least two centrifugal flow channels, and the outlets of the at least two centrifugal flow channels surround the circumference of the axis of the inner rotor body. 3 . distributed to the interval. 3 . The inner rotor for a cylindrical permanent magnet governor according to claim 1 , wherein the centrifugal flow channel comprises at least two holes, and the at least two holes are opened on the radial outer peripheral surface of the inner rotor body. 4 . Above, the at least two holes are distributed at intervals along the axis of the inner rotor body. 4. The inner rotor for a cylindrical permanent magnet governor according to claim 1, wherein the inner rotor body is provided with a centrifugal effusion chamber; the centrifugal effusion chamber is communicated with the inlet of the centrifugal flow channel, so as to The centrifugal flow channel supplies coolant. 5. The inner rotor for a barrel-type permanent magnet governor according to claim 4, characterized in that, There are at least two centrifugal flow channels, and the outlets of the at least two centrifugal flow channels are distributed at intervals around the circumference of the axis of the inner rotor body; There are at least two centrifugal liquid accumulation chambers, and the at least two centrifugal liquid accumulation chambers are distributed at intervals around the circumference of the axis of the inner rotor body; Any one of the centrifugal fluid accumulation chambers is communicated with the inlet of at least one centrifugal flow channel. 6. The inner rotor for a cylindrical permanent magnet governor according to claim 4 or 5, characterized in that, along the axial direction of the inner rotor body, the inner rotor body has opposite first and second ends; The first end is provided with a diversion edge surrounding the outer circumference of the axis of the inner rotor body, and the inner diameter of the diversion edge close to the first end is larger than the inner diameter of the diversion edge away from the first end; The inner peripheral surface of the surrounding edge and the outer surface of the first end portion form a centrifugal diversion cavity, and the inner wall of the centrifugal diversion cavity is provided with a liquid supply port that communicates with the centrifugal diversion cavity and the centrifugal liquid accumulation cavity. 7 . The inner rotor for a cylindrical permanent magnet speed governor according to claim 6 , wherein, along the direction of the axis of the inner rotor body, the projection of the guide surrounding edge shields the liquid supply port. 8 . 8 . The inner rotor for a cylindrical permanent magnet speed governor according to claim 6 , wherein the flow-guiding surrounding edge comprises: 9 . The radial guide surrounding edge, the radial guide surrounding edge surrounds the outer circumference of the axis of the inner rotor body, one end of the radial guide surrounding edge is arranged on the first end, and the other end of the radial guide surrounding edge is away from extending in the direction of the first end; and an axial flow-guiding edge, the axial flow-guiding edge surrounds the outer circumference of the axis of the inner rotor body, and one side of the axial flow-guiding edge is connected to the end of the radial flow-guiding edge that is far from the first end, The other side of the axial flow shroud extends in a direction close to the axis of the inner rotor body. 9 . The inner rotor for a cylindrical permanent magnet speed governor according to claim 8 , wherein a connecting platform is provided on the radial flow guiding peripheral edge, and a first connecting hole is provided on the connecting platform; 10 . A second connection hole corresponding to the first connection hole is arranged on the axial flow guide peripheral edge, and fasteners are pierced in the first connection hole and the second connection hole. 10. A barrel-type permanent magnet governor, characterized in that it comprises an outer rotor and the inner rotor for the barrel-type permanent magnet governor according to any one of claims 1-9; the outer rotor is provided with a accommodating cavity; The inner rotor is installed in the accommodating cavity, and the radial outer peripheral surface of the inner rotor body and the inner wall of the accommodating cavity are spaced and matched to form an air gap.

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