Circulating pump motor with variable starting torque

Abstract

The invention belongs to the field of circulating pump motors, and discloses a circulating pump motor with variable starting torque, which consists of a variable-torque double-side induction rotor and a full-closed type starting iron core, and is characterized in that the variable-torque double-side induction rotor consists of an inclined T-shaped starting copper rod, an inclined T-shaped auxiliary starting copper rod and a variable-torque double-side induction rotor iron core; the device is small in size, high in power factor, easy to assemble, convenient to maintain in the later period, capable of effectively shortening the starting time, capable of monitoring the running state of the variable-torque double-side induction rotor in real time, capable of dynamically adjusting the torque and large in power safety margin.

Description

Technical Field

[0001] The invention relates to the field of circulating pump motors, and in particular to a circulating pump motor with variable starting torque. Background Art

[0002] As an important power part of the complex nuclear reactor water supply system, the circulating pump motor not only has very important operating performance, but also has strict restrictions on its starting time due to the influence of the overall system. For large-capacity circulating pump motors, the starting current when starting at full pressure is too large, which can easily cause the motor to overheat. Therefore, it is advisable to adopt a reduced-voltage starting method, but it often means that the starting time will exceed the response time required by the system, and the circulating pump motor may be overloaded for a short time during operation. Therefore, it is necessary to increase the power safety margin to ensure the reliability of the circulating pump motor. When running at high speed, the rotor of the circulating pump motor is prone to breakage. Once a problem occurs, it needs to be replaced as a whole, which takes a long time to repair, and the fault monitoring of the circulating pump motor rotor is not perfect. Therefore, in order to address the above shortcomings, it is urgent to develop a circulating pump motor with variable starting torque. Summary of the invention

[0003] In view of this, the present invention provides a circulating pump motor with variable starting torque which has the characteristics of simple assembly, convenient installation, convenient maintenance, short starting time, etc.

[0004] The technical solution of the present invention is: a circulating pump motor with variable starting torque, which is composed of a variable torque double-sided induction rotor and a fully closed starting iron core;

[0005] The variable torque double-sided induction rotor is composed of an oblique T-shaped starting copper rod, an oblique T-shaped auxiliary starting copper rod, and a variable torque double-sided induction rotor iron core;

[0006] The fully closed starting iron core is arranged inside the variable torque double-sided induction rotor iron core;

[0007] There is air between the fully closed starting iron core and the variable torque double-sided induction rotor iron core;

[0008] The outer surface of the variable torque double-sided induction rotor core in the radial direction is provided with a plurality of first oblique T-shaped slots at equal intervals along the circumferential direction;

[0009] The inner surface of the variable torque double-sided induction rotor core in the radial direction is provided with second oblique T-shaped slots having the same number as the first oblique T-shaped slots 14 at equal intervals along the circumferential direction;

[0010] The oblique T-shaped starting copper rod is arranged in the first oblique T-shaped groove;

[0011] The oblique T-shaped auxiliary starting copper rod is arranged in the second oblique T-shaped groove.

[0012] In the above-mentioned circulating pump motor with variable starting torque, the fully closed starting iron core has a first rectangular through hole and a second rectangular through hole, and the auxiliary starting windings are evenly distributed in eight groups along the circumferential direction. One end of each group of auxiliary starting windings is placed in the first rectangular through hole, and the other end is placed in the second rectangular through hole.

[0013] In the above-mentioned circulating pump motor with variable starting torque, the variable torque double-sided induction rotor core is arranged inside the outer stator core; there is air between the variable torque double-sided induction rotor core and the outer stator core, and a plurality of outer stator rectangular slots are provided at equal intervals along the circumferential direction on the air gap side surface of the outer stator core; and the outer stator winding is placed in the outer stator rectangular slots of the outer stator core.

[0014] In the above-mentioned circulating pump motor with variable starting torque, the fully closed starting iron core has eight groups of first fan-shaped through holes and second fan-shaped through holes evenly distributed along the circumferential direction, each group of first fan-shaped through holes and second fan-shaped through holes is located between each group of first rectangular through holes and second rectangular through holes, the first fan-shaped through holes are located outside the second fan-shaped through holes in the radial direction, the fan angle of the first fan-shaped through holes is greater than the fan angle of the second fan-shaped through holes, and the first fan-shaped through holes are connected to the second fan-shaped through holes.

[0015] In the above-mentioned circulating pump motor with variable starting torque, the outer fan-shaped fixed stopper is welded on both sides of the axial direction of the inclined T-type starting copper rod, and the bottom of the outer fan-shaped fixed stopper is located in the same plane as the bottom of the inclined T-type starting copper rod, and the inner fan-shaped fixed stopper is welded on both sides of the axial direction of the inclined T-type auxiliary starting copper rod, and the bottom of the inner fan-shaped fixed stopper is located in the same plane as the bottom of the inclined T-type auxiliary starting copper rod.

[0016] In the above-mentioned circulating pump motor with variable starting torque, a centripetal elastic insulating pad is arranged between the outer fan-shaped fixed block and the inner fan-shaped fixed block in the radial direction, the outer fan-shaped fixed block, the inner fan-shaped fixed block and the centripetal elastic insulating pad are fixed by bolt connection, an outer brake pad is arranged between the nut and the outer fan-shaped fixed block, and an inner brake pad is arranged between the nut and the inner fan-shaped fixed block.

[0017] In the above-mentioned variable starting torque circulating pump motor, the axial lengths of the oblique T-type starting copper rod, the variable torque double-sided induction rotor core, and the oblique T-type auxiliary starting copper rod are consistent, the axial lengths of the centripetal elastic insulating pad, the outer fan-shaped fixed block, and the inner fan-shaped fixed block are consistent, and the outer fan-shaped fixed block and the inner fan-shaped fixed block are copper.

[0018] In the above-mentioned circulating pump motor with variable starting torque, the radial height of the outer brake pad after folding is 1 / 2 of the radial height of the inclined T-type starting copper rod, and the radial height of the inner brake pad after folding is 1 / 2 of the radial height of the inclined T-type auxiliary starting copper rod.

[0019] In the above-mentioned circulating pump motor with variable starting torque, the inclined T-type starting copper rod and the inclined T-type auxiliary starting copper rod are inclined by 1 / 4 tooth pitch, and the top width of the inclined T-type auxiliary starting copper rod is smaller than the top width of the inclined T-type starting copper rod.

[0020] In the above-mentioned circulating pump motor with variable starting torque, the current flow direction of the auxiliary starting winding in the second rectangular through hole adjacent to the right side of the first rectangular through hole in the circumferential direction remains opposite, and the current flow direction of the auxiliary starting winding in the second rectangular through hole adjacent to the left side of the first rectangular through hole in the circumferential direction remains the same.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention has small size, high power factor, simple assembly and convenient later maintenance.

[0023] 2. The present invention effectively shortens the starting time.

[0024] 3. The present invention monitors the operating status of the variable torque double-sided induction rotor in real time.

[0025] 4. The present invention can dynamically adjust the torque and has a large power safety margin. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following is a brief introduction to the drawings required for use in the embodiments of the present invention.

[0027] Figure 1 This is a front view of a circulating pump motor with variable starting torque.

[0028] Figure 2 This is a local enlarged view of point I.

[0029] Figure 3 It is the side view of the variable torque double-sided induction rotor.

[0030] Figure 4 It is a two-dimensional cross-sectional view of the circulating pump motor AA with variable starting torque.

[0031] Figure 5 This is the front view of the variable torque double-sided induction rotor.

[0032] Figure 6 It is a two-dimensional cross-sectional view of the variable torque double-sided induction rotor BB.

[0033] Figure 7 This is the starting rotor core parts diagram.

[0034] Figure 8 This is the parts diagram of the fully closed starting core.

[0035] Fig. 9 This is the parts drawing of the inclined T-type starting copper rod.

[0036] Fig.10 This is the parts drawing of the inclined T-type auxiliary starting copper rod.

[0037] Explanation of the reference parts in the figure: 1-external stator core; 2-external stator winding; 3-oblique T-type starting copper rod; 4-oblique T-type auxiliary starting copper rod; 5-fully closed starting core; 6-variable torque double-sided induction rotor; 7-external brake pad; 8-external fan-shaped fixed block; 9-centripetal elastic insulating pad; 10-inner fan-shaped fixed block; 11-inner brake pad; 12-variable torque double-sided induction rotor core; 13-auxiliary starting winding; 14-first oblique T-slot; 15-second oblique T-slot; 16-first fan-shaped through hole; 17-second fan-shaped through hole; 18-first rectangular through hole; 19-second rectangular through hole. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and beneficial effects of the present invention clearer, further explanation will be given below in conjunction with the accompanying drawings and specific embodiments, but each embodiment does not constitute a limitation of the present invention. The specific embodiments described in the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] like Figures 1 to 10 As shown, a circulating pump motor with variable starting torque is composed of a variable torque double-sided induction rotor 6 and a fully closed starting core 5; the variable torque double-sided induction rotor 6 is composed of an oblique T-type starting copper rod 3, an oblique T-type auxiliary starting copper rod 4, and a variable torque double-sided induction rotor core 12; the fully closed starting core 5 is arranged inside the variable torque double-sided induction rotor core 12; there is air between the fully closed starting core 5 and the variable torque double-sided induction rotor core 12; the outer side surface of the variable torque double-sided induction rotor core 12 in the radial direction is provided with a plurality of first oblique T-shaped slots 14 at equal intervals along the circumferential direction; the inner side surface of the variable torque double-sided induction rotor core 12 in the radial direction is provided with the same number of second oblique T-shaped slots 15 as the first oblique T-shaped slots 14 at equal intervals along the circumferential direction; the oblique T-shaped starting copper rod 3 is arranged in the first oblique T-shaped slot 14; the oblique T-shaped auxiliary starting copper rod 4 is arranged in the second oblique T-shaped slot 15. The motor has a small overall size, high power factor, simple assembly and convenient later maintenance.

[0040] like Figure 1 , 4 As shown in , 8, the fully closed starter core 5 is evenly distributed with eight groups of first rectangular through holes 18 and second rectangular through holes 19 along the circumferential direction. The first rectangular through holes 18 and the second rectangular through holes 19 are not placed on the outer surface of the fully closed starter core 5, so as to reduce the tooth harmonics caused by the slots and reduce the noise during the operation of the circulating pump motor. The auxiliary starter windings 13 are evenly distributed with eight groups along the circumferential direction. One end of each group of auxiliary starter windings 13 is placed in the first rectangular through hole 18, and the other end is placed in the second rectangular through hole 19.

[0041] like Figure 1 , 4 As shown, the variable torque double-sided induction rotor core 12 is arranged inside the outer stator core 1; there is air between the variable torque double-sided induction rotor core 12 and the outer stator core 1, and a plurality of outer stator rectangular slots are provided at equal intervals along the circumferential direction on the air gap side surface of the outer stator core 1; the outer stator winding 2 is placed in the outer stator rectangular slots of the outer stator core 1.

[0042] like Figure 8 As shown, the fully closed starter core 5 is evenly distributed with eight groups of first fan-shaped through holes 16 and second fan-shaped through holes 17 along the circumferential direction, each group of first fan-shaped through holes 16 and second fan-shaped through holes 17 is located between each group of first rectangular through holes 18 and second rectangular through holes 19, the first fan-shaped through holes 16 are located outside the second fan-shaped through holes 17 in the radial direction, the fan-shaped angle of the first fan-shaped through holes 16 is greater than the fan-shaped angle of the second fan-shaped through holes 17, which is conducive to reducing the temperature of the magnetic pole core close to the air gap side of the variable torque double-sided induction rotor core 12, and the first fan-shaped through holes 16 are connected to the second fan-shaped through holes 17. The weight of the overall fully closed starter core 5 is effectively reduced, saving costs.

[0043] like Figure 3 , 6 As shown in Figures 9 and 10, the outer sector-shaped fixed block 8 is welded to the axial sides of the oblique T-type starting copper rod 3, effectively preventing the oblique T-type starting copper rod 3 from moving in the axial position. In addition, the mass of the rotating parts is increased, and the stability of the motor at high-speed rotation is improved. The bottom of the outer sector-shaped fixed block 8 and the bottom of the oblique T-type starting copper rod 3 are located in the same plane, which is convenient for determining the welding position. The inner sector-shaped fixed block 10 is welded to the axial sides of the oblique T-type auxiliary starting copper rod 4, effectively preventing the oblique T-type auxiliary starting copper rod 4 from moving in the axial position. At the same time, the mass of the rotating parts is increased, and the stability of the motor at high-speed rotation is improved. The bottom of the inner sector-shaped fixed block 10 and the bottom of the oblique T-type auxiliary starting copper rod 4 are located in the same plane. It is convenient for determining the welding position.

[0044] like Figure 2 , 3As shown in Figures 5 and 6, a centripetal elastic insulating pad 9 is arranged between the outer sector-shaped fixed block 8 and the inner sector-shaped fixed block 10 in the radial direction to prevent the direct contact between the oblique T-type starting copper rod 3 and the oblique T-type auxiliary starting copper rod 4, which causes a short circuit, and effectively reduces the vibration of the variable torque double-sided induction rotor 6, reduces noise, and prolongs the service life of the variable torque double-sided induction rotor 6. The outer sector-shaped fixed block 8, the inner sector-shaped fixed block 10 and the centripetal elastic insulating pad 9 are fixed by bolt connection. When the oblique T-type starting copper rod 3 and the oblique T-type auxiliary starting copper rod 4 are mechanically damaged and need to be replaced, the relevant connection parts can be directly disassembled and replaced independently, and the maintenance time is short. An outer brake pad 7 is arranged between the nut and the outer sector-shaped fixed block 8 to effectively limit the displacement of the outer sector-shaped fixed block 8 in the radial direction and avoid the loosening of the nut connection during the operation of the motor. An inner brake pad 11 is arranged between the nut and the inner sector-shaped fixed block 10. The radial displacement of the inner sector-shaped fixed stopper 10 is effectively limited to avoid loosening of the connection during the operation of the motor.

[0045] like Figure 2 , 3 As shown in , 5, and 6, the axial lengths of the oblique T-type starting copper rod 3, the variable torque double-sided induction rotor core 12, and the oblique T-type auxiliary starting copper rod 4 are consistent, which is convenient for fixing the positions of the oblique T-type starting copper rod 3 and the oblique T-type auxiliary starting copper rod 4. The axial lengths of the centripetal elastic insulating pad 9, the outer fan-shaped fixed block 8, and the inner fan-shaped fixed block 10 are consistent, and the outer fan-shaped fixed block 8 and the inner fan-shaped fixed block 10 are copper. This is conducive to the heat conduction of the oblique T-type starting copper rod 3 and the oblique T-type auxiliary starting copper rod 4, and improves the heat dissipation effect.

[0046] like Figure 1 , 2 As shown, the radial height of the outer brake pad 7 after folding is 1 / 2 of the radial height of the oblique T-type starting copper rod 3, and the radial height of the inner brake pad 11 after folding is 1 / 2 of the radial height of the oblique T-type auxiliary starting copper rod 4. This is beneficial to heat dissipation of the outer sector-shaped fixed block 8 and the inner sector-shaped fixed block 10.

[0047] Figure 1 , 2As shown in Figures 4, 5, 7, 9 and 10, the inclined T-type starting copper rod 3 and the inclined T-type auxiliary starting copper rod 4 are inclined by 1 / 4 tooth pitch, which can effectively increase the heat dissipation area of ​​the inclined T-type starting copper rod 3 and the inclined T-type auxiliary starting copper rod 4 and reduce the temperature of the inclined T-type starting copper rod 3 and the inclined T-type auxiliary starting copper rod 4. The top width of the inclined T-type auxiliary starting copper rod 4 is smaller than the top width of the inclined T-type starting copper rod 3, so as to avoid the local excessive magnetic flux density on the inner side of the variable torque double-sided induction rotor core 12, which causes excessive temperature. When the motor starts, affected by the skin effect, the current is mainly distributed on the top of the inclined T-type auxiliary starting copper rod 4, and the resistance cross-sectional area of ​​the top of the inclined T-type auxiliary starting copper rod 4 is small, which can effectively improve a part of the starting torque.

[0048] like Figure 1 , 4 As shown, the current flow directions of the auxiliary starting winding 13 in the first rectangular through hole 18 and the second rectangular through hole 19 adjacent to the right side in the circumferential direction are opposite, and the current flow directions of the auxiliary starting winding 13 in the first rectangular through hole 18 and the second rectangular through hole 19 adjacent to the left side in the circumferential direction are the same. When the motor starts, by applying a current of a certain amplitude to the auxiliary starting winding 13, and the current flow direction is opposite and alternately changed, and the frequency of the alternating change is the industrial frequency, the inclined T-shaped auxiliary starting copper bar 4 generates an induced current, and then generates an electromagnetic torque, which is superimposed with the electromagnetic torque generated by the stator current in the inclined T-shaped starting copper bar 3 to form a starting torque, effectively shortening the starting time.

[0049] When the motor is running, the auxiliary starting winding 13 is opened and the open circuit voltage harmonic component signal is observed. Once the inclined T-type starting copper rod 3 and the inclined T-type auxiliary starting copper rod 4 are broken, it will cause magnetic field distortion and change the voltage harmonic component signal, which can effectively monitor the safe operation of the motor.

[0050] When the motor is overloaded for a short time during operation and the output torque needs to be increased for a short time, current can be applied to the auxiliary starting winding 13 again. By adjusting the applied current, the motor can meet the requirements and have a large power safety margin.

[0051] Finally, the protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope and spirit of the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these changes and modifications.

Claims

1. A circulating pump motor with variable starting torque, characterized in that: The invention relates to a variable torque double-sided induction rotor (6) and a fully closed starting iron core (5), wherein the variable torque double-sided induction rotor (6) is composed of an inclined T-shaped starting copper rod (3), an inclined T-shaped auxiliary starting copper rod (4), and a variable torque double-sided induction rotor iron core (12); the fully closed starting iron core (5) is arranged inside the variable torque double-sided induction rotor iron core (12); air is provided between the fully closed starting iron core (5) and the variable torque double-sided induction rotor iron core (12); the variable torque The outer surface of the double-sided induction rotor core (12) in the radial direction is provided with a plurality of first oblique T-shaped slots (14) at equal intervals along the circumferential direction; the inner surface of the variable torque double-sided induction rotor core (12) in the radial direction is provided with the same number of second oblique T-shaped slots (15) as the first oblique T-shaped slots (14) at equal intervals along the circumferential direction; the oblique T-shaped starting copper rod (3) is arranged in the first oblique T-shaped slot (14); and the oblique T-shaped auxiliary starting copper rod (4) is arranged in the second oblique T-shaped slot (15).

2. The variable starting torque circulating pump motor according to claim 1 is characterized in that: The fully closed starting iron core (5) has eight groups of first rectangular through holes (18) and second rectangular through holes (19) evenly distributed along the circumferential direction, and the auxiliary starting windings (13) have eight groups evenly distributed along the circumferential direction, one end of each group of auxiliary starting windings (13) is placed in the first rectangular through hole (18), and the other end is placed in the second rectangular through hole (19).

3. A circulating pump motor with variable starting torque according to claim 1, characterized in that: The variable torque double-sided induction rotor core (12) is arranged inside the outer stator core (1); air is provided between the variable torque double-sided induction rotor core (12) and the outer stator core (1); a plurality of outer stator rectangular slots are provided at equal intervals along the circumferential direction on the air gap side surface of the outer stator core (1); and an outer stator winding (2) is placed in the outer stator rectangular slots of the outer stator core (1).

4. The variable starting torque circulating pump motor according to claim 2 is characterized in that: The fully closed starting core (5) has eight groups of first fan-shaped through holes (16) and second fan-shaped through holes (17) uniformly distributed along the circumferential direction, each group of first fan-shaped through holes (16) and second fan-shaped through holes (17) is located between each group of first rectangular through holes (18) and second rectangular through holes (19), the first fan-shaped through holes (16) are located radially outside the second fan-shaped through holes (17), the fan-shaped angle of the first fan-shaped through holes (16) is greater than the fan-shaped angle of the second fan-shaped through holes (17), and the first fan-shaped through holes (16) are communicated with the second fan-shaped through holes (17).

5. The variable starting torque circulating pump motor according to claim 1 is characterized in that: The outer fan-shaped fixed stopper (8) is welded to the axial sides of the inclined T-shaped starting copper rod (3), and the bottom of the outer fan-shaped fixed stopper (8) and the bottom of the inclined T-shaped starting copper rod (3) are located in the same plane. The inner fan-shaped fixed stopper (10) is welded to the axial sides of the inclined T-shaped auxiliary starting copper rod (4), and the bottom of the inner fan-shaped fixed stopper (10) and the bottom of the inclined T-shaped auxiliary starting copper rod (4) are located in the same plane.

6. The variable starting torque circulating pump motor according to claim 5 is characterized in that: A centripetal elastic insulating pad (9) is arranged between the outer fan-shaped fixed block (8) and the inner fan-shaped fixed block (10) in the radial direction, and the outer fan-shaped fixed block (8), the inner fan-shaped fixed block (10) and the centripetal elastic insulating pad (9) are fixed by bolt connection, an outer brake pad (7) is arranged between the nut and the outer fan-shaped fixed block (8), and an inner brake pad (11) is arranged between the nut and the inner fan-shaped fixed block (10).

7. The variable starting torque circulating pump motor according to claim 1 is characterized in that: The axial lengths of the oblique T-shaped starting copper rod (3), the variable torque double-sided induction rotor core (12), and the oblique T-shaped auxiliary starting copper rod (4) are consistent, and the axial lengths of the centripetal elastic insulating pad (9), the outer fan-shaped fixed block (8), and the inner fan-shaped fixed block (10) are consistent, and the outer fan-shaped fixed block (8) and the inner fan-shaped fixed block (10) are made of copper.

8. The variable starting torque circulating pump motor according to claim 6 is characterized in that: The radial height of the outer brake pad (7) after folding is 1 / 2 of the radial height of the inclined T-shaped starting copper rod 3, and the radial height of the inner brake pad (11) after folding is 1 / 2 of the radial height of the inclined T-shaped auxiliary starting copper rod 4.

9. The variable starting torque circulating pump motor according to claim 1 is characterized in that: The inclined T-shaped starting copper rod (3) and the inclined T-shaped auxiliary starting copper rod (4) are inclined by 1 / 4 of the tooth pitch, and the top width of the inclined T-shaped auxiliary starting copper rod (4) is smaller than the top width of the inclined T-shaped starting copper rod (3).

10. The variable starting torque circulating pump motor according to claim 2, characterized in that: The current flow directions of the auxiliary starting winding (13) in the first rectangular through hole (18) and the second rectangular through hole (19) adjacent to the right side in the circumferential direction are opposite, and the current flow directions of the auxiliary starting winding (13) in the first rectangular through hole (18) and the second rectangular through hole (19) adjacent to the left side in the circumferential direction are the same.

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