Double-stator permanent magnet servo variable pitch motor and assembly tool

Abstract

The utility model discloses a double-stator permanent magnet servo variable-pitch motor and an assembly tool, and the double-stator permanent magnet servo variable-pitch motor comprises a rotor and a housing assembly, and also comprises a first stator, a second stator, a first rotary transformer, a second rotary transformer, a first electric connector and a second electric connector which are disposed in the housing assembly. The first stator and the second stator are both used for driving the rotor, the first rotary transformer and the second rotary transformer are arranged on the rotor and are respectively controlled by two sets of independent control units, and the first rotary transformer and the first stator are connected with one of the control units through a first electric connector. And the second rotary transformer and the second stator are connected with the other control unit through a second electric connector. The method has the advantages that the optimal output torque is obtained, and the power density is improved; and the fault tolerance of the product is improved.

Description

Technical Field

[0001] The utility model relates to the field of wind power generation, in particular to a double-stator permanent magnet servo variable pitch motor and an assembly tool. Background Art

[0002] With the continuous development of modern industry, the megawatt rating of wind turbines in the wind power industry has continued to climb, from 1.5MW to 10MW and beyond. This places even higher demands on the motors used in variable pitch systems. Traditional permanent magnet servo motors struggle to meet increasingly stringent operating requirements under certain environmental conditions, facing numerous challenges. First, variable pitch motors require greater torque output while also limiting current, a requirement that existing motors struggle to meet. Second, the initial phase mismatch between the two stators in a dual-stator motor results in a lack of interchangeability between the two resolvers. Misplacing the stators and resolvers can lead to incorrect initial resolver electrical angles, resulting in degraded motor performance and even safety failures such as motor runaway and tower collapse.

[0003] In view of this, it is necessary to provide a dual-stator permanent magnet servo pitch motor and an assembly tool. Summary of the Invention

[0004] The utility model provides a dual-stator permanent magnet servo variable pitch motor and an assembly tool, which effectively solve the problems of low safety and low torque-to-current ratio faced by existing dual-stator motors.

[0005] The technical solution adopted in this utility model is:

[0006] A dual-stator permanent magnet servo pitch motor includes a rotor, a housing assembly, and also includes a first stator, a second stator, a first rotary transformer, a second rotary transformer, a first electrical connector, and a second electrical connector arranged in the housing assembly. The first stator and the second stator are both used to drive the rotor. The first rotary transformer and the second rotary transformer are arranged on the rotor and are respectively controlled by two independent control units. The first rotary transformer and the first stator are connected to one of the control units through a first electrical connector, and the second rotary transformer and the second stator are connected to the other control unit through a second electrical connector.

[0007] Furthermore, the housing assembly includes a housing, a rear end cover respectively arranged at one end of the housing, and a front end cover respectively arranged at the other end of the housing; the inner wall of the housing is provided with a first annular step for positioning the first stator and a second annular step for positioning the housing assembly; the outer wall of the first stator is provided with a first keyway along the axial circumference, and the outer wall of the second stator is provided with a second keyway along the axial circumference.

[0008] Furthermore, a through hole is provided on one side of the shell, and the first key slot and the second key slot are both connected to the through hole and have the same direction.

[0009] The motor assembly tooling, applied to a dual-stator permanent magnet servo pitch motor, comprises a housing positioning base and a positioning key. The housing positioning base comprises a chassis and a cylinder mounted on the chassis. The inner wall of the cylinder is provided with a first annular step for positioning the first stator, the outer wall of the cylinder is provided with a second annular step for positioning the housing assembly, and the upper end of the cylinder is provided with a convex key for positioning the first keyway. Several first positioning assemblies are circumferentially disposed on the chassis, and second positioning assemblies corresponding to the first positioning assemblies are circumferentially disposed on the housing. The first positioning assembly is a first vertical through hole, a first screw hole, or a first boss, and the second positioning assembly is a second vertical through hole, a second screw hole, or a second boss.

[0010] Furthermore, the positioning key includes a vertical rod and a horizontal rod fixedly connected to one end of the vertical rod, the vertical rod passes through the second key groove and extends into the first key groove to abut against the convex key, and the horizontal rod is located outside the end of the shell.

[0011] The beneficial effects of the utility model are as follows: the rotor can be driven simultaneously by the first stator and the second stator to realize dual drive, so that the rotor obtains the best output torque and the power density is improved; the dual drive can reduce the maximum output current requirement of the external driver, and the selection of a conventional driver can improve the standardization of the product; the first stator and the first rotating transformer are connected to a set of external control units, and the second stator and the second rotating transformer are connected to another set of control units. The two sets of electrically connected control units are decoupled from each other and operate independently; when a set of winding stators fails, the other set of winding stators can continue to work, so that the motor works to the feathering state and is shut down for inspection; the fault tolerance of the product is increased, and after the connection plugs of the two sets of control units are plugged in incorrectly, that is, the first stator and the second rotating transformer are connected to the same control unit, and the second stator and the first rotating transformer are connected to the same control unit, the motor can still operate normally and stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a cross-sectional view of a dual-stator permanent magnet servo pitch motor provided in an embodiment of the present application.

[0013] Figure 2 This is a schematic diagram of the first stator and casing positioning base of the dual-stator permanent magnet servo pitch motor provided in an embodiment of the present application.

[0014] Figure 3 This is a top view of the first stator of the dual-stator permanent magnet servo pitch motor provided in an embodiment of the present application.

[0015] Figure 4 This is a schematic diagram of the second stator of the dual-stator permanent magnet servo pitch motor provided in an embodiment of the present application.

[0016] Figure 5 This is a schematic diagram of the housing of the dual-stator permanent magnet servo pitch motor provided in an embodiment of the present application.

[0017] Figure 6 This is a schematic diagram of the assembly of the first stator of the dual-stator permanent magnet servo pitch motor and the housing positioning base of the motor assembly tooling provided in an embodiment of the present application.

[0018] Figure 7 This is a schematic assembly diagram of the first stator, housing, and housing positioning base of the motor assembly tooling of the dual-stator permanent magnet servo pitch motor provided in an embodiment of the present application.

[0019] Figure 8 This is a schematic assembly diagram of the first stator, second stator, housing and motor assembly tooling of the dual-stator permanent magnet servo pitch motor provided in an embodiment of the present application.

[0020] Figure 9 A schematic diagram of a housing positioning base of a motor assembly tool provided in an embodiment of the present application.

[0021] The following are marked in the figure: 1. rotor; 2. first stator; 3. second stator; 4. first rotary transformer; 5. second rotary transformer; 6. housing assembly; 61. housing; 62. rear end cover; 611. first annular step; 612. second annular step; 201. first keyway; 301. second keyway; 613. through hole; 8. housing positioning base; 9. positioning key; 81. chassis; 82. cylinder; 802. second annular step; 83. convex key; 91. crossbar; 92. vertical bar; 810. first positioning assembly; 601. second positioning assembly; DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0023] like Figure 1 、 Figure 2 and Figure 4As shown, the first embodiment provided by the present application is a dual-stator permanent magnet servo pitch motor, comprising a rotor 1, a housing assembly 6, and also comprising a first stator 2, a second stator 3, a first rotary transformer 4, a second rotary transformer 5, a first electrical connector, and a second electrical connector arranged in the housing assembly 6. The first stator 2 and the second stator 3 are both used to drive the rotor 1. The first rotary transformer 4 and the second rotary transformer 5 are arranged on the rotor 1 and are respectively controlled by two independent control units. The first rotary transformer 4 and the first stator 2 are connected to one of the control units through a first electrical connector, and the second rotary transformer 5 and the second stator 3 are connected to the other control unit through a second electrical connector.

[0024] In actual use, the rotor 1 is driven by the first stator 2 and the second stator 3 at the same time or by one of them, the first stator 2 is controlled by the first rotary transformer 4 to realize output control of the rotor 1, and the second stator 3 is controlled by the second rotary transformer 5 to realize output control of the rotor 1, the position and speed of the rotor 1 when driven by the first stator 2 are detected and the excitation signal is transmitted through the first electrical connector, and the position and speed of the rotor 1 when driven by the second stator 3 are detected and the excitation signal is transmitted through the second electrical connector.

[0025] In the above design, the rotor 1 can be driven simultaneously by the first stator 2 and the second stator 3 to realize dual drive, so that the rotor 1 obtains the best output torque and the power density is improved; the dual drive can reduce the maximum output current requirement of the external driver, and the selection of a conventional driver can improve the standardization of the product; the first stator 2 and the first rotary transformer 4 are connected to a set of external control units, and the second stator 3 and the second rotary transformer 5 are connected to another set of control units. The two sets of electrically connected control units are decoupled from each other and operate independently; when one set of winding stators fails, the other set of winding stators can continue to work, so that the motor can be shut down for inspection after it works to the feathering state; the fault tolerance of the product is increased, and after the connection plugs of the two sets of control units are plugged in incorrectly, that is, the first stator 2 and the second rotary transformer 5 are connected to the same control unit, and the second stator 3 and the first rotary transformer 4 are connected to the same control unit, the motor can still operate normally and stably.

[0026] Specifically: Figure 1 、 Figure 5 、 Figure 7 and Figure 3As shown, the housing assembly 6 includes a housing 61, a rear end cover 62 respectively arranged at one end of the housing 61, and a front end cover arranged at the other end of the housing 61. The inner wall of the housing 61 is provided with a first annular step 611 for positioning the first stator 2 and a second annular step 612 for positioning the second stator 3. The outer wall of the first stator 2 is provided with a first keyway 201 along the axial circumference, and the outer wall of the second stator 3 is provided with a second keyway 301 along the axial circumference.

[0027] In actual use, the first stator 2 is fixed to the housing 61 by interference fit, and the second stator 3 is positioned by the second annular step 612 and then interference fits with the housing 61. The front and rear covers 62 are assembled with the housing 61 to form a protective cavity for the first stator 2 and the second stator 3.

[0028] In the above design, the structural design of the housing assembly 6 and the specific implementation of the housing assembly 6 and the first stator 2 and the second stator 3 can effectively fix and protect the first stator 2 and the second stator 3.

[0029] Specifically: Figure 5 As shown, a through hole 613 is provided on one side of the housing 61 , and the first key groove 201 and the second key groove 301 are both connected to the through hole 613 and have the same direction.

[0030] In actual use, when the first stator 2 and the second stator 3 are assembled to the housing 61 using a tool, the first keyway 201 and the second keyway 301 are positioned by the tool, so that the first keyway 201 and the second keyway 301 are aligned, thereby achieving phase consistency between the first stator 2 and the second stator 3.

[0031] In the above design, the provision of the through hole 613 can facilitate the tooling to simultaneously position the first keyway 201 and the second keyway 301 .

[0032] like Figure 9 、 Figure 6 、 Figure 7 and Figure 8As shown, the present application provides a second embodiment, which is a motor assembly tool used for a dual-stator permanent magnet servo pitch motor, including a casing positioning base 8 and a positioning key 9. The casing positioning base 8 includes a chassis 81 and a cylinder 82 arranged on the chassis 81. The outer wall of the cylinder 82 is provided with a second annular step 802 for axially positioning the shell assembly 6. The upper end of the cylinder 82 is provided with a convex key 83 for positioning the first keyway 201. Several first positioning assemblies 810 are circumferentially provided on the chassis 81, and second positioning assemblies 601 corresponding to the first positioning assemblies 810 are circumferentially provided on the shell 62. The first positioning assembly 810 is a first vertical through hole, a first screw hole, or a first boss. The second positioning assembly 601 is a second vertical through hole, a second screw hole, or a second boss.

[0033] In actual use, the housing is positioned on the base 8 so that the chassis 81 supports the cylinder 82. The first keyway 201 is then positioned using the first annular step cam 83. The housing 61 is then placed on the first stator 2, so that the first annular step 611 axially positions the upper end of the first stator 2. Circumferential positioning is achieved using the positioning assembly 810 on the chassis 81 and the second positioning assembly 601 of the housing 61. The positioning key 9 is then inserted into the first keyway 201. Using the positioning key 9 as a guide, the second stator 3 is placed into the housing 61, so that the second annular step 612 axially positions the lower end of the second stator 3. The positioning key 9 circumferentially positions the second stator 3 via the second keyway 301.

[0034] In the above design, the use of motor assembly tooling to assemble the dual-stator permanent magnet servo pitch motor prevents the rotor 1 from spinning out of control during startup due to excessive initial angle deviation when the first stator 2 is incorrectly plugged into the second resolver 5, or when the second stator 3 is incorrectly plugged into the first resolver 4, effectively preventing safety accidents. It also ensures that the motor can operate normally and stably after incorrect plugging.

[0035] Specifically: Figure 8 As shown, the positioning key 9 includes a vertical rod 92 and a horizontal rod 91 fixedly connected to one end of the vertical rod 92. The vertical rod 92 passes through the second key groove 301 and extends into the first key groove 201, and then abuts against the convex key 83. The horizontal rod 91 is located outside the end of the shell 61.

[0036] In actual use, by holding the horizontal rod 91, the vertical rod 92 is inserted from the top of the housing 61, so that the vertical rod 92 passes through the second keyway 301 and then extends into the first keyway 201, where it abuts against the upper end of the protruding key 83. Then, aligning the positioning key 9, the second stator 3 is placed into the housing 61, so that the second annular step 612 axially positions the lower end of the second stator 3, and the positioning key 9 circumferentially positions the second stator 3.

[0037] In the above design, the structural design and specific implementation of the positioning key 9 can effectively realize the positioning of the first stator 2 and the second stator 3, so that the motor can still operate normally after being wrongly plugged in.

[0038] To further explain in detail, it should be understood that the above is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dual-stator permanent magnet servo variable pitch motor, comprising a rotor (1) and a housing assembly (6), characterized in that: The invention also includes a first stator (2), a second stator (3), a first rotary transformer (4), a second rotary transformer (5), a first electrical connector, and a second electrical connector, which are arranged in a housing assembly (6); the first stator (2) and the second stator (3) are both used to drive the rotor (1); the first rotary transformer (4) and the second rotary transformer (5) are arranged on the rotor (1) and are respectively controlled by two independent control units; the first rotary transformer (4) and the first stator (2) are connected to one of the control units via the first electrical connector; the second rotary transformer (5) and the second stator (3) are connected to the other control unit via the second electrical connector.

2. The dual-stator permanent magnet servo pitch motor according to claim 1, characterized in that: The housing assembly (6) comprises a housing (61), a rear end cover (62) respectively arranged at one end of the housing (61), and a front end cover arranged at the other end of the housing (61); the inner wall of the housing (61) is provided with a first annular step (611) for positioning the first stator (2) and a second annular step (612) for positioning the second stator (3); the outer wall of the first stator (2) is provided with a first keyway (201) along the axial circumferential direction, and the outer wall of the second stator (3) is provided with a second keyway (301) along the axial circumferential direction.

3. The dual-stator permanent magnet servo pitch motor according to claim 2, characterized in that: A through hole (613) is provided on one side of the housing (61), and the first key groove (201) and the second key groove (301) are both connected to the through hole (613) and have the same direction.

4. A motor assembly tool, applied to the dual-stator permanent magnet servo pitch motor according to claim 3, characterized in that: The invention comprises a casing positioning base (8) and a positioning key (9), wherein the casing positioning base (8) comprises a chassis (81) and a cylinder (82) arranged on the chassis (81), wherein the inner wall of the cylinder (82) is provided with a No. 1 annular step for positioning the first stator (2), and the outer wall of the cylinder (82) is provided with a No. 2 annular step (802) for positioning the housing assembly (6), and the upper end of the cylinder (82) is provided with a convex key (83) for positioning the first keyway (201), and a plurality of first positioning assemblies (810) are circumferentially arranged on the chassis (81), and a second positioning assembly (601) corresponding to the first positioning assembly (810) is circumferentially arranged on the housing (61), wherein the first positioning assembly (810) is a No. 1 vertical through hole, a No. 1 screw hole, or a No. 1 boss, and the second positioning assembly (601) is a No. 2 vertical through hole, a No. 2 screw hole, or a No. 2 boss.

5. The motor assembly tool according to claim 4, characterized in that: The positioning key (9) comprises a vertical rod (92) and a horizontal rod (91) fixedly connected to one end of the vertical rod (92); the vertical rod (92) passes through the second key groove (301) and extends into the first key groove (201) to abut against the convex key (83); the horizontal rod (91) is located outside the end of the shell (61).

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