Switched reluctance electric roller

Abstract

A switched reluctance electric roller is composed of a roller body 10, a magnetic isolation sleeve 9, a rotor iron core 5, a stator iron core 4, a fixed shaft 21, a pole winding 7 and a driving unit 2, the rotating speed and the torque can be independently adjusted and controlled according to the running load condition, and when the load is high, the torque can be enhanced by increasing the current of a phase winding; when the load is low, the torque output is reduced by reducing the current of the phase winding, and the rotating speed of the electric roller is controlled by controlling the switching period of the insulated gate bipolar transistor, so that the optimal energy-saving effect is achieved, and the motor is widely applied to the departments such as mines, metallurgy, chemical engineering, coal, building materials, electric power, grain and transportation.

Description

Technical Field

[0001] The present invention belongs to the field of electromechanical transmission and relates to the technical field of electric rollers, and in particular to a switched reluctance electric roller. Background Art

[0002] Fixed and mobile belt conveyors, separate drive devices that replace the traditional motor + reducer outside the drive roller. The electric roller has many advantages such as compact structure, high transmission efficiency, low noise, good sealing, small space, easy installation, etc., and is suitable for working in various harsh environmental conditions. It generally adopts a power mechanism composed of an electric motor and a reducer. The motor is used as the original power, and the roller body is driven to rotate after being reduced by the reducer. Under this type of reduction transmission structure, the reducer needs lubricating oil to operate, but the lubricating oil is a test for the insulation performance of the motor, which increases the requirements for the safety protection level of the motor. In practical applications, it will also increase safety hazards and the problem of too low energy conversion efficiency; secondly, when the electric roller is actually running, the lubricating oil is on the inner wall of the roller under the action of centrifugal force, which makes it difficult to lubricate the reducer, and the oil leakage problem is also unavoidable, thus affecting the performance of the whole machine. In addition, due to different material transportation volumes, the output torque required by the electric roller is also different, but the required transmission speed will not decrease accordingly. The torque output of the traditional electric roller at the same speed is the same, resulting in power loss under low load.

[0003] The overall efficiency of the switched reluctance motor is higher than that of the asynchronous motor variable frequency speed regulation system in a wide range of speed regulation and power. It absorbs less current from the power supply side and can obtain a larger starting torque on the motor side. The starting torque can reach 250% of the rated torque, while the starting current is only 30% of the rated current. It can run for a long time at low speed, solving the problem of motor heating when the variable frequency speed regulation motor runs at low speed. The purpose of the present invention application is to develop an electric roller with excellent performance by using the principle of the switched reluctance motor and combining it with the actual situation of the electric roller. Summary of the invention

[0004] The present invention provides a switched reluctance electric drum capable of adjusting torque output under different load conditions, which is composed of a drum body, a magnetic isolation sleeve, a rotor core, a stator core, a fixed shaft, a phase winding and a drive unit, and is characterized in that: the drum body is a cylindrical structure, the inside of the drum body is connected to the rotor core through the magnetic isolation sleeve, the inside of the rotor core is the stator core, the stator core is fixed on the fixed shaft, a magnetic pole winding is also wound on the stator core, a uniform air gap is provided between the outer surface of the stator core and the inner surface of the rotor core, the magnetic pole winding is connected to form a phase winding, and the phase winding is electrically connected to the drive unit; The stator core includes a stator yoke and stator poles arranged on the outer ring of the stator yoke, and pole windings are wound on each stator pole, and the pole windings are connected to form a phase winding; the rotor core includes a rotor yoke, rotor poles, and permanent magnets, and rotor poles are arranged on the inner ring of the rotor yoke. Rotor slots are formed between two adjacent rotor poles, and permanent magnets are embedded in the rotor slots in a method that adjacent permanent magnets have the same polarity. The magnetized rotor poles are distributed in NSNS... magnetic polarity; The rotor magnetic poles are composed of rotor pole bosses and rotor pole oblique arcs on both sides; the number of stator magnetic poles is a multiple of 3, and the number of rotor magnetic poles is an even number; The speed control of the drive unit adopts square wave excitation control of a three-phase full-bridge circuit structure, and the torque control adopts thyristor chopper voltage stabilization control; The fixed shaft is made of thick-walled seamless steel pipe, a stator core heat exchange tube is installed in the bottom of the stator magnetic pole, a cooling medium inlet ring pipe is connected to the left end of all the stator core heat exchange tubes, and a cooling medium outlet ring pipe is connected to the right end of all the stator core heat exchange tubes, the cooling medium inlet ring pipe is connected to the cooling medium inlet mother pipe, the cooling medium outlet ring pipe is connected to the cooling medium outlet mother pipe, the cooling medium inlet mother pipe and the cooling medium outlet mother pipe are installed in the inner cavity of the fixed shaft, and are respectively extended through both ends to connect to the cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 It is a transverse cross-sectional view of a 9 / 12-pole switched reluctance electric drum in an embodiment of the present invention; Figure 2 A longitudinal cross-sectional view of a switched reluctance electric drum according to an embodiment of the present invention; Figure 3 This is a circuit connection block diagram of a switched reluctance electric drum according to an embodiment of the present invention; Figure 4 This is a stator winding connection diagram in an embodiment of the present invention; Figure 5 The stator and rotor states when the insulated gate bipolar transistors T4 and T5 are turned on in the embodiment of the present invention; Figure 6 The stator and rotor states of the insulated gate bipolar transistors T4 and T5 after they are turned on in the embodiment of the present invention; Figure 7 The stator and rotor states of the insulated gate bipolar transistors T1 and T4 when they are turned on in the embodiment of the present invention; Figure 8 The stator and rotor states of the insulated gate bipolar transistors T1 and T4 after they are turned on in the embodiment of the present invention; Fig. 9 The stator and rotor states when the insulated gate bipolar transistors T4 and T6 are turned on in the embodiment of the present invention; Fig.10The stator and rotor states after the insulated gate bipolar transistors T4 and T6 are turned on in the embodiment of the present invention; Fig.11 The stator and rotor states when the insulated gate bipolar transistors T3 and T6 are turned on in the embodiment of the present invention; Fig.12 The stator and rotor states of the insulated gate bipolar transistors T3 and T6 after they are turned on in the embodiment of the present invention. Fig.13 The stator and rotor states when the insulated gate bipolar transistors T2 and T3 are turned on in the embodiment of the present invention; Fig.14 The stator and rotor states of the insulated gate bipolar transistors T2 and T3 after they are turned on in the embodiment of the present invention; Fig.15 The stator and rotor states when the insulated gate bipolar transistors T2 and T5 are turned on in the embodiment of the present invention; Fig.16 This is the state of the stator and rotor after the insulated gate bipolar transistors T2 and T5 are turned on in the embodiment of the present invention.

[0006] In the figure: 1. DC power supply, 2 drive unit, 3. phase winding, 4. stator core, 5. rotor core, 6. stator pole, 7. pole winding, 8. rotor pole, 9. magnetic shield, 10. drum body, 11. permanent magnet, 12. rotor pole boss, 13. rotor pole skew arc, 14. magnetic detector, 15. air gap, 16. rotor pin, 17. roller pin, 18. stator core heat exchange tube, 19. cooling medium inlet main pipe, 2 0. Cooling medium outlet main pipe, 21. Fixed shaft, 22. End cover, 23. Bearing, 24. Protective cover, 25. Cooling medium inlet ring pipe, 26. Cooling medium outlet ring pipe, C. Voltage stabilizing capacitor, D. Freewheeling diode, D1~D6. Fast recovery diode, T. Thyristor, T1~T6 Insulated gate bipolar transistor, k. Star point electronic switch, k1. A phase electronic switch, k2. B phase electronic switch, k3. C phase electronic switch. DETAILED DESCRIPTION

[0007] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0008] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "one side", "one end", "one side" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0009] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0010] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0011] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0012] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0013] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0014] The present invention discloses a switched reluctance electric drum, which is composed of a drum body 10, a magnetic isolation sleeve 9, a rotor core 5, a stator core 4, a fixed shaft 21, a phase winding 3 and a drive unit 2, and is characterized in that: the drum body 10 is a cylindrical structure, the inside of the drum body 10 is connected to the rotor core 5 through the magnetic isolation sleeve 9, the stator core 4 is installed inside the rotor core 5, the stator core 4 is fixed on the fixed shaft 21, a magnetic pole winding 7 is also wound on the stator core 4, a uniform air gap 15 is provided between the outer surface of the stator core 4 and the inner surface of the rotor core 5, the magnetic pole winding 7 is connected to form a phase winding 3, and the phase winding 3 is electrically connected to the drive unit 2; The stator core 4 includes a stator yoke and stator poles 6 arranged on the outer ring of the stator yoke, and each stator pole 6 is wound with a pole winding 7, and the pole windings 7 are connected to form a phase winding 3; the rotor core 5 includes a rotor yoke, a rotor pole 8, and a permanent magnet 11. The rotor pole 8 is arranged on the inner ring of the rotor yoke, and a rotor slot is formed between two adjacent rotor poles. The permanent magnets 11 are embedded in the rotor slots in a method that the polarities of adjacent permanent magnets 11 are the same, and the magnetized rotor poles are distributed in NSNS... magnetic polarity; The rotor pole 8 is composed of a rotor pole boss 12 and rotor pole oblique arcs 13 on both sides; the number of stator poles is a multiple of 3, and the number of rotor poles is an even number; The speed control of the drive unit 2 adopts square wave excitation control of a three-phase full-bridge circuit structure, and the torque control adopts thyristor chopper voltage stabilization control; The fixed shaft 21 is made of thick-walled seamless steel pipe, a stator core heat exchange tube 18 is installed in the bottom of the stator magnetic pole 6, a cooling medium inlet ring tube 25 is connected to the left end of all the stator core heat exchange tubes 18, and a cooling medium outlet ring tube 26 is connected to the right end of all the stator core heat exchange tubes 18, the cooling medium inlet ring tube 25 is connected to the cooling medium inlet mother pipe 19, the cooling medium outlet ring pipe 26 is connected to the cooling medium outlet mother pipe 20, the cooling medium inlet mother pipe 19 and the cooling medium outlet mother pipe 20 are installed in the cavity of the fixed shaft 21, and are respectively connected to the cooling system through the two ends extending out; The cavity of the fixed shaft 21 also passes through the power line and signal line of the phase winding 3; The stator core heat exchange tube 18, the cooling medium inlet ring tube 25 and the cooling medium outlet ring tube 26 are made of non-magnetic materials.

[0015] The torque control of the drive unit 2 is controlled by a torque control system, which controls the on and off time of the thyristor T and the freewheeling of the freewheeling diode D by adjusting the duty cycle of the input pulse to the base of the thyristor T, thereby providing the system with a continuously adjustable DC current; The rotation speed control system obtains a continuously adjustable rotation speed by controlling the switching cycle time of the insulated gate bipolar transistor of the drive unit 2 .

[0016] The speed control of the drive unit 2 adopts square wave excitation control with a three-phase full-bridge as the main circuit structure, and the torque control adopts thyristor T chopper voltage stabilization control.

[0017] The insulated gate bipolar transistor T1 is connected in parallel with the reverse fast recovery diode D1, and is connected in series with the insulated gate bipolar transistor T2, and is connected to the A phase winding of the phase winding 3, and is connected to the A phase terminal of the magnetic force detector 14 through the A phase electronic switch k1. The insulated gate bipolar transistor T2 is connected in parallel with the reverse fast recovery diode D2; the insulated gate bipolar transistor T3 is connected in parallel with the reverse fast recovery diode D3, and is connected in series with the insulated gate bipolar transistor T4, and is connected to the B phase winding of the phase winding 3. The insulated gate bipolar transistor T4 is connected in parallel with the reverse-connected fast recovery diode D4; the insulated gate bipolar transistor T5 is connected in parallel with the reverse-connected fast recovery diode D5 and in series with the insulated gate bipolar transistor T6, as well as the C-phase winding of the phase winding 3, and is connected to the C-phase terminal of the magnetic detector 14 through the C-phase electronic switch k3, and the insulated gate bipolar transistor T6 is connected in parallel with the reverse-connected fast recovery diode D6.

[0018] The pole windings 7 are arranged in the order of A, B, C, A, B, C..., and each three A, B, C are connected at the tail ends to form a short-circuited pole winding, and the short-circuited tap of any group of pole windings is led to the star point terminal of the magnetic detector 14 through the star point electronic switch k.

[0019] Each pole winding has the same number of turns, wire diameter, and winding direction. Figure 4 As shown, the pole windings 7 are connected to form phase windings.

[0020] Before the electric drum starts running, the magnetic detector 14 sends pulse signals to the A, B, and C pole windings 7 through the star point electronic switch k, the A phase electronic switch k1, the B phase electronic switch k2, and the C phase electronic switch k3 respectively, and compares and detects the magnetic force and polarity of the three-phase windings. The stator pole 6 of this phase is determined to correspond to the N pole rotor pole when the N pole magnetic force detected is the strongest, and the stator pole 6 of this phase is determined to correspond to the S pole rotor pole when the S pole magnetic force detected is the strongest. Then, the strengths of the two are compared, and the position with the larger strength is set as the initial position.

[0021] When the electric drum is running, the phase winding 3 corresponding to the initial position is not energized and no magnetic field is established. If the N pole is in the initial position, the adjacent pole winding 7 in the rotation direction conducts a positive current to establish a magnetic field opposite to the S pole rotor pole 8, generating an attractive electromagnetic force. At the same time, the positive current is passed through the pole winding 7, and the adjacent pole winding 7 in the rotation direction conducts a reverse current to establish the same magnetic field as the S pole rotor pole 8, generating a repulsive electromagnetic force. The rotor deflects under the action of the magnetic field and enters the S pole rotor pole 8 to align with the next stator pole 6 in the rotation direction. After entering this position, the stator pole 6 is opposite to the S pole rotor pole 8. The corresponding pole winding 7 is not energized and does not establish a magnetic field. The adjacent pole winding 7 in the rotation direction conducts a reverse current to establish a magnetic field opposite to the N-pole rotor pole 8, generating an attractive electromagnetic force. At the same time, the pole winding 7 with a reverse current conducts a positive current to establish a magnetic field identical to the N-pole rotor pole 8, generating a repulsive electromagnetic force. The rotor deflects under the action of the magnetic field and enters the N-pole rotor pole 8 to align with the next stator pole 6 in the rotation direction. This cycle forms an electromagnetic torque, converting electrical energy into mechanical energy. If the S pole is in the initial position, the current direction of the pole winding 7 is opposite. Combined with the attached drawings, take the 9 / 12-pole switched reluctance electric drum as an example: the phase winding 3 is star-connected, combined with square wave control, to generate continuous positive torque to ensure the normal operation of the switched reluctance electric drum, every 60° is a power-on cycle of the phase winding 3, every 10° phase change, three-phase square wave control: such a cycle, each cycle conducts 60° mechanical angle; Among them, the initial position 0° of the switched reluctance electric roller is set as the position where the A-phase stator pole 6 is aligned with the N-pole rotor pole 8. When the insulated gate bipolar transistors T4 and T5 are turned on, the rotor position is 0°→10°, and the direction of the motor winding current is C→B; when the insulated gate bipolar transistors T1 and T4 are turned on, the rotor position is 10°→20°, and the direction of the motor winding current is A→B; when the insulated gate bipolar transistors T1 and T6 are turned on, the rotor position is 20°→30°, and the direction of the motor winding current is A→C; when the insulated gate bipolar transistors T3 and T6 are turned on, the rotor position is 30°→40°, and the direction of the motor winding current is B→C; when the insulated gate bipolar transistors T2 and T3 are turned on, the rotor position is 40°→50°, and the direction of the motor winding current is B→A; when the insulated gate bipolar transistors T2 and T5 are turned on, the rotor position is 50°→60°, the direction of the motor winding current is C→A, and the roller rotates forward; The initial position 0° of the switched reluctance electric drum is set to the position where the A-phase stator pole 6 is aligned with the N-pole rotor pole 8. When the insulated gate bipolar transistors T3 and T6 are turned on, the rotor position is 0°→-10°, and the motor winding current direction is B→C; when the insulated gate bipolar transistors T2 and T3 are turned on, the rotor position is -10°→-20°, and the motor winding current direction is B→A; when the insulated gate bipolar transistors T2 and T5 are turned on, the rotor position is -20°→-3 0°, the direction of the motor winding current is C→A; when the insulated gate bipolar transistors T4 and T5 are turned on, the rotor position is -30°→-40°, and the direction of the motor winding current is C→B; when the insulated gate bipolar transistors T1 and T4 are turned on, the rotor position is -40°→-50°, and the direction of the motor winding current is A→B; when the insulated gate bipolar transistors T1 and T6 are turned on, the rotor position is -50°→-60°, and the direction of the motor winding current is A→C, and the roller reverses.

[0022] Since the rotor position is not consistent before the roller starts, there are several situations: In the first case, the N pole of the rotor pole 8 is aligned with the C pole of the stator pole 6, and the magnetic detector 14 outputs a pulse test voltage to the pole winding 7, measures the degree of obstruction of the current passing through the pole winding 7, and determines the corresponding position of the aligned rotor pole 8 and the stator pole, as well as the corresponding polarity. After the determination is completed, the star point electronic switch k, the A phase electronic switch k1, the B phase electronic switch k2, and the C phase electronic switch k3 are disconnected, and the pole winding 7 is turned on in turn according to the steering requirements with the set insulated gate bipolar transistor switching sequence.The direction of the current in each pole winding can be known according to the right-hand screw rule and the law of electromagnetic force: the stator pole A is all S polarity, the stator pole B is all N polarity, the stator pole C is not energized and has no polarity, each stator pole A is the same polarity as each rotor pole S, and all generate repulsive electromagnetic force. At the same time, the stator pole B with N polarity generates an attractive electromagnetic force on the rotor pole S. Due to the unbalanced structure of the stator and rotor poles, the rotor rotating body rotates in the predetermined direction of the stator pole current, so that the S pole of the rotor pole 8 is aligned with the B pole of the stator pole 6; then proceed to the next step, change the conduction strategy of the insulated gate bipolar transistor so that the stator pole A is all S polarity, the stator pole C is all N polarity, the stator pole B is not energized and has no polarity, and each stator pole C is respectively aligned with each rotor pole N The same polarity generates repulsive electromagnetic force. At the same time, the stator pole A with N polarity generates attractive electromagnetic force on the rotor pole S. The rotor rotating body rotates in the predetermined direction of the stator pole current, so that the N pole of the rotor pole 8 is aligned with the A pole of the stator pole 6. Then, the next step is to change the conduction strategy of the insulated gate bipolar transistor so that the stator poles B are all S polarity, the stator poles C are all N polarity, the stator pole A is not energized and has no polarity, and each stator pole B is respectively aligned with each rotor pole S have the same polarity, and both produce repulsive electromagnetic force. At the same time, the stator pole C with N polarity produces attractive electromagnetic force on the rotor pole S. The rotor rotating body rotates in the predetermined direction of the stator pole current, so that the S pole of the rotor pole 8 is aligned with the C pole of the stator pole 6; then the next step is carried out to change the conduction strategy of the insulated gate bipolar transistor, the stator pole A is all N polarity, the stator pole B is all S polarity, the stator pole C is not energized and has no polarity, and each stator pole A is respectively aligned with each rotor pole N The same polarity generates repulsive electromagnetic force. At the same time, the stator pole B with S polarity generates attractive electromagnetic force on the rotor pole S. The rotor rotating body rotates in the predetermined direction of the stator pole current, so that the N pole of the rotor pole 8 is aligned with the B pole of the stator pole 6. Then, the next step is to change the conduction strategy of the insulated gate bipolar transistor, so that the stator poles C are all S polarity, the stator poles A are all N polarity, the stator poles B are not energized and have no polarity, and the stator poles C are respectively the same polarity as the rotor poles S, and all generate repulsive electromagnetic force. At the same time, the stator pole A with N polarity generates attractive electromagnetic force on the rotor pole S. The rotor rotating body rotates in the predetermined direction of the stator pole current, so that the N pole of the rotor pole 8 is aligned with the C pole of the stator pole 6. The above process is repeated, and the motor continuously converts electrical energy into mechanical energy, driving the load to do work.

[0023] In the second case, the S pole of the rotor pole 8 is aligned with the C pole of the stator pole 6, and the magnetic detector 14 outputs a pulse test voltage to the pole winding 7, measures the degree of obstruction of the current passing through the pole winding 7, and determines the corresponding position of the aligned rotor pole 8 and the stator pole, as well as the corresponding polarity. After the determination is completed, the star point electronic switch k, the A phase electronic switch k1, the B phase electronic switch k2, and the C phase electronic switch k3 are disconnected, and the pole winding 7 is turned on in turn according to the steering requirements with the set insulated gate bipolar transistor switching sequence; the current direction in each pole winding is that the stator pole A is N polarity, the stator pole B is S polarity, the stator pole C is not energized and has no polarity, and each stator pole A is respectively connected to each rotor pole N The same polarity generates repulsive electromagnetic force. At the same time, the stator pole B with S polarity generates attractive electromagnetic force on the rotor pole S. The rotor rotating body rotates in the predetermined direction of the stator pole current, so that the N pole of the rotor pole 8 is aligned with the B pole of the stator pole 6; then proceed to the next step, change the conduction strategy of the insulated gate bipolar transistor, so that the stator poles C are all S polarity, the stator poles A are all N polarity, the stator poles B are not powered and have no polarity, and each stator pole C is respectively the same polarity as each rotor pole S, and all generate repulsive electromagnetic force. At the same time, the stator pole A with N polarity generates attractive electromagnetic force on the rotor pole S, and the rotor rotating body rotates in the predetermined direction of the stator pole current, so that the N pole of the rotor pole 8 is aligned with the C pole of the stator pole 6; then proceed to the next step, the stator poles A are all S polarity, the stator poles B are all N polarity, the stator poles C are not powered and have no polarity, and each stator pole A is respectively aligned with each rotor pole S The same polarity generates repulsive electromagnetic force. At the same time, the stator pole B with N polarity generates attractive electromagnetic force on the rotor pole S. Due to the unbalanced structure of the stator and rotor poles, the rotor rotating body rotates in the predetermined direction of the stator pole current, so that the S pole of the rotor pole 8 is aligned with the B pole of the stator pole 6; then the next step is to change the conduction strategy of the insulated gate bipolar transistor so that the stator pole A is all S polarity, the stator pole C is all N polarity, the stator pole B is not energized and has no polarity, and each stator pole C is respectively aligned with each rotor pole N The same polarity generates repulsive electromagnetic force. At the same time, the stator pole A with N polarity generates attractive electromagnetic force on the rotor pole S. The rotor rotating body rotates in the predetermined direction of the stator pole current, so that the N pole of the rotor pole 8 is aligned with the A pole of the stator pole 6. Then, the next step is to change the conduction strategy of the insulated gate bipolar transistor, so that the stator poles B are all S polarity, the stator poles C are all N polarity, the stator pole A is not energized and has no polarity, and each stator pole B has the same polarity as each rotor pole S, and generates repulsive electromagnetic force. At the same time, the stator pole C with N polarity generates attractive electromagnetic force on the rotor pole S. The rotor rotating body rotates in the predetermined direction of the stator pole current, so that the S pole of the rotor pole 8 is aligned with the C pole of the stator pole 6. The above process is repeated, and the motor continuously converts electrical energy into mechanical energy, driving the load to do work.

[0024] In the third case, the N pole of the rotor pole 8 is aligned with the A pole of the stator pole 6. In the fourth case, the S pole of the rotor pole 8 is aligned with the A pole of the stator pole 6. In the fifth case, the N pole of the rotor pole 8 is aligned with the B pole of the stator pole 6. In the sixth case, the S pole of the rotor pole 8 is aligned with the B pole of the stator pole 6. The working strategy refers to the first and second cases and will not be repeated.

[0025] In the seventh case, when the N pole of the rotor pole 8 is aligned with the C pole of the stator pole 6 by not less than 50% and is offset in the opposite direction, the C phase pole winding and the A phase pole winding are passed through a positive current, and the B phase pole winding is passed through a reverse current, that is, the insulated gate bipolar transistors T1, T4, and T5 are turned on, so that the electromagnetic polarities of the stator pole A and the stator pole B are both S poles, and the C pole of the stator pole 6 and the rotor pole N generate an attractive electromagnetic force, while the A pole of the stator pole 6 and the rotor pole S generate a repulsive electromagnetic force, and the N pole of the rotor pole 8 is completely aligned with the C pole of the stator pole 6, and thereafter the magnetization sequence of the stator poles is cycled according to the above steps.

[0026] In the eighth case, when the N pole of the rotor pole 8 is aligned with the C pole of the stator pole 6 by not less than 50% and is offset in the positive direction, the C phase pole winding and the B phase pole winding are passed through the reverse current, and the A phase pole winding is passed through the forward current, that is, the insulated gate bipolar transistors T1, T4, and T6 are turned on, so that the electromagnetic polarities of the stator pole C and the stator pole B are both N poles, and the C pole of the stator pole 6 and the rotor pole N generate a repulsive electromagnetic force. At the same time, the B pole of the stator pole 6 and the rotor pole S generate an attractive electromagnetic force, and the S pole of the rotor pole 8 is completely aligned with the B pole of the stator pole 6. Thereafter, the magnetization sequence of the stator poles is cycled according to the above steps.

[0027] In the ninth case, when the alignment of the N pole of the rotor magnetic pole 8 with the stator magnetic pole 6 is less than 50%, due to the asymmetry of the number of stator and rotor poles, the alignment of the S pole of the rotor magnetic pole 8 with the stator magnetic pole 6 will exceed 50%. The conduction sequence of the insulated gate bipolar transistors is adjusted according to the S pole alignment method according to the above method. When the roller needs to be reversed, the current flowing through the pole winding 7 is opposite to the above situation.

[0028] The speed control of the electric drum is achieved by controlling the switching cycle of the insulated gate bipolar transistor; the torque output of the electric drum is controlled by the thyristor T and has nothing to do with the speed of the electric drum. When the load torque fed back by the torque sensor increases, the thyristor T increases the system voltage, thereby increasing the current of the phase winding 3. Conversely, the system voltage is reduced to reduce the current of the phase winding 3. The current signal and voltage signal collected from the drive unit 2 are used to ensure that the voltage and current of the system are within a safe range.

[0029] The invention application can adjust the speed and torque separately according to the operating load conditions. When the load is high, the torque can be enhanced by increasing the phase winding current. When the load is low, the torque output can be reduced by reducing the phase winding current. The speed of the electric drum can be controlled by controlling the switching cycle of the insulated gate bipolar transistor, thereby achieving the best energy-saving effect. The invention is widely used in mining, metallurgy, chemical industry, coal, building materials, electricity, food, transportation and other departments.

Claims

1. A switched reluctance electric drum, comprising a drum body (10), a magnetic isolation sleeve (9), a rotor core (5), a stator core (4), a fixed shaft (21), a magnetic pole winding (3) and a drive unit (2), characterized in that: The drum body (10) is a cylindrical structure. The inside of the drum body (10) is connected to the rotor core (5) via a magnetic isolation sleeve (9). The inside of the rotor core (5) is installed with a stator core (4). The stator core (4) is fixed on a fixed shaft (21). A magnetic pole winding (7) is also wound on the stator core (4). A uniform air gap (15) is provided between the outer surface of the stator core (4) and the inner surface of the rotor core (5). The magnetic pole winding (7) is connected to form a phase winding (3). The phase winding (3) is electrically connected to a drive unit (2). The stator core (4) comprises a stator yoke and stator magnetic poles (6) arranged on the outer ring of the stator yoke, each stator magnetic pole (6) is wound with a magnetic pole winding (7), and the magnetic pole windings (7) are connected to form a phase winding (3); the rotor core (5) comprises a rotor yoke, a rotor magnetic pole (8), and a permanent magnet (11), the rotor yoke inner ring is provided with a rotor magnetic pole (8), a rotor slot is formed between two adjacent rotor magnetic poles, the permanent magnets (11) are embedded in the rotor slot in a manner that the polarities of adjacent permanent magnets (11) are the same, and the magnetized rotor magnetic poles are distributed in an NSNS... magnetic polarity pattern; The rotor magnetic pole (8) is composed of a rotor pole boss (12) and rotor pole oblique arcs (13) on two sides; the number of stator magnetic poles is a multiple of 3, and the number of rotor magnetic poles is an even number.

2. A switched reluctance electric drum according to claim 1, characterized in that: The speed control of the drive unit (2) adopts square wave excitation control of a three-phase full-bridge circuit structure, and the torque control adopts thyristor chopper voltage stabilization control.

3. The switched reluctance electric drum according to claim 1, characterized in that: The fixed shaft (21) is made of a thick-walled seamless steel pipe. A stator core heat exchange tube (18) is installed in the bottom of the stator magnetic pole (6). A cooling medium inlet ring tube (25) is connected to the left end of all the stator core heat exchange tubes (18). A cooling medium outlet ring tube (26) is connected to the right end of all the stator core heat exchange tubes (18). The cooling medium inlet ring tube (25) is connected to a cooling medium inlet mother tube (19). The cooling medium outlet ring tube (26) is connected to a cooling medium outlet mother tube (20). The cooling medium inlet mother tube (19) and the cooling medium outlet mother tube (20) are installed in the cavity of the fixed shaft (21) and are connected to a cooling system through two ends thereof. A power line and a signal line of the phase winding (3) are also passed through the cavity of the fixed shaft (21); The stator core heat exchange tube (18), the cooling medium inlet ring tube (25) and the cooling medium outlet ring tube (26) are made of non-magnetic materials.

4. The switched reluctance electric drum according to claim 1, characterized in that: The torque control of the drive unit (2) is controlled by a torque control system, which controls the on and off time of the thyristor T and the freewheeling of the freewheeling diode D by adjusting the duty cycle of the input pulse to the base of the thyristor T, thereby providing a continuously adjustable direct current for the system; The rotation speed control system obtains a continuously adjustable rotation speed by controlling the switching cycle time of the insulated gate bipolar transistor of the drive unit (2); The speed control of the drive unit (2) adopts square wave excitation control with a three-phase full-bridge as the main circuit structure, and the torque control adopts thyristor T chopper voltage stabilization control.

5. The switched reluctance electric drum according to claim 1, characterized in that: The magnetic pole windings (7) are arranged in the order of A, B, C, A, B, C..., and each group of three A, B, C are connected at their tail ends to form a short-circuited magnetic pole winding, and the short-circuited tap of any group of magnetic pole windings is led to the star point terminal of the magnetic detector (14) via a star point electronic switch k.

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