High-precision III-type sine winding common magnetic circuit coarse-fine coupling winding type rotary transformer

Abstract

The utility model relates to a high-precision III-type sine winding common magnetic circuit coarse-fine coupling winding type rotary transformer, belongs to the field of precision micromotors-rotary transformers, and solves the technical problems of low material and space utilization rate, large output potential THD, insufficient positioning precision and the like of a traditional rotary transformer. According to the technical scheme, the method is characterized in that the machining technology, application size limitation and precision indexes are comprehensively considered, optimization is carried out by adopting a non-fixed tooth position turn number rounding and magnetic circuit segmentation compensation concept, and a high-precision design strategy of the common-magnetic-circuit rotary transformer of the III-type sine winding improved by adopting optimal pole groove matching and matching is provided. The design core and difficulty are that the number of turns of the 16X-fine machine excitation winding adopting the double-layer short-pitch winding is matched with the number of turns of the 16X-fine machine signal winding adopting the improved III-type sine winding. The rotary transformer is used for motor speed and position signal detection in an extremely severe environment, the output potential THD of the signal winding can be greatly reduced, the precision performance of the rotary transformer is improved, and the error is as low as 5 ''.

Description

Technical Field

[0001] The utility model belongs to the field of precision micro-motor-rotating transformer, and specifically relates to a high-precision III type sinusoidal winding common magnetic circuit coarse-fine coupling winding type rotating transformer. Background Art

[0002] The rotary transformer has a reliable structure, sensitive action, high precision, and a mechanical structure similar to that of an asynchronous motor, so it has the function of electrical isolation and can be used in overload and heavy load conditions. Since the rotary transformer does not have optical components and circuit hardware, it is suitable for high-intensity radiation and extreme temperature conditions, especially places with harsh environments such as severe cold, high temperature, humidity, high speed, and high vibration. Therefore, the rotary transformer is widely used in aerospace, servo control systems, robotic systems, electric vehicles, national defense and military fields.

[0003] A resolver is a precision micromotor that rotates with the motor being measured and converts the rotor angle into an electrical signal that is a function of the motor. It is mainly used as a position and speed sensor. The structure of a resolver is mainly composed of a rotor, a stator, an excitation winding, and a sine and cosine signal winding. The coarse-fine coupling resolver has two sets of excitation windings and signal windings. Since the resolver is a signal motor, the main technical indicators for measuring its performance are also different from those of other types of motors. The main parameters of the resolver are the rated excitation voltage, excitation frequency, transformation ratio, open-circuit input impedance, and zero-position voltage. The main technical indicators are the function error and the zero-position error (such as Figure 1 ), that is, accuracy.

[0004] In the prior art, rotary transformers are mostly wound with double-layer short-pitch windings and equal-turn concentrated windings. The above structure has poor ability to weaken the high-order harmonics of the signal, which is not conducive to further reducing the THD (total harmonic distortion) of the rotary transformer output signal and improving the accuracy performance. Utility Model Content

[0005] The utility model aims to solve the above problems existing in the background technology and provide a high-precision III-type sinusoidal winding common magnetic circuit coarse-fine coupling winding type rotary transformer.

[0006] The utility model adopts a novel type III sinusoidal winding structure, which can effectively reduce the THD of the signal winding output potential and greatly improve the accuracy of various types of rotary transformers compared with the traditional double-layer short-distance winding and equal-turn concentrated winding.

[0007] The utility model achieves the above purpose, and the technical scheme adopted is as follows:

[0008] A high-precision III type sinusoidal winding common magnetic circuit coarse-fine coupling winding type rotary transformer comprises an inner rotor and an outer stator, the inner rotor and the outer stator are coaxial, and an air gap is provided between the two, and teeth and slots are provided at intervals on the outer cylindrical surface of the inner rotor and the inner cylindrical surface of the outer stator;

[0009] The teeth of the inner rotor are respectively wound with 1X-rough machine excitation winding and 16X-fine machine excitation winding. The 1X-rough machine excitation winding is firstly embedded, and after winding at the bottom of the inner rotor slot, the 16X-fine machine excitation winding is embedded again. The 1X-rough machine excitation winding adopts type II sinusoidal winding, and the 16X-fine machine excitation winding adopts double-layer short-distance winding.

[0010] The teeth of the outer stator are respectively wound with 1X-coarse machine signal winding and 16X-fine machine signal winding. The 1X-coarse machine signal winding is composed of 1X-coarse machine sine signal winding and 1X-coarse machine cosine signal winding, and the 16X-fine machine signal winding is composed of 16X-fine machine sine signal winding and 16X-fine machine cosine signal winding. The 1X-coarse machine sine signal winding and 1X-coarse machine cosine signal winding are firstly embedded, and after being wound at the bottom of the slot of the outer stator, the 16X-fine machine sine signal winding is then embedded, and after being wound in the middle of the slot of the outer stator, the 16X-fine machine cosine signal winding is finally embedded and wound near the slot of the outer stator. Both the 1X-coarse machine signal winding and the 16X-fine machine signal winding adopt Type III sine winding.

[0011] When the number of pole pairs is 16, the number of slots of the inner rotor is 32, and the number of slots of the outer stator is 44, the number of turns of each winding in the unit motor of the common magnetic circuit coarse-fine coupled winding rotary transformer is as follows:

[0012] The number of winding turns corresponding to the 8 slots of the 1X-rough machine excitation winding is: 21-20-18-16-13-10-6-2;

[0013] The number of winding turns corresponding to the 11 slots of the 1X-coarse machine signal winding is:

[0014] Sine phase: 11-11-10-10-9-8-7-5-4-2-1;

[0015] Cosine phase: 11-1-2-4-5-7-8-9-10-10-11;

[0016] The number of turns of the 16X-precision machine excitation winding is: 26;

[0017] The number of winding turns corresponding to the 11 slots of the 16X-precision signal winding is:

[0018] Sine phase: 32-3-37-45-22-16-43-40-10-28-46;

[0019] Cosine phase: 32-46-28-10-40-43-16-22-45-37-3.

[0020] The calculation formula for the number of coil turns in each slot of a type III sinusoidal winding is:

[0021]

[0022] Among them, N si 、N ci ——Number of turns of the winding corresponding to the i-th slot of the sine and cosine. The starting position of the slot is arbitrarily selected and is arranged in sequence in a clockwise direction;

[0023] N——maximum number of winding turns;

[0024] Z s ——Number of stator slots of resolver;

[0025] P——number of pole pairs of resolver;

[0026] Since the number of turns of the type III sinusoidal winding needs to be rounded, orthogonal error will inevitably occur. Therefore, the difference angle Δθ between the sine phase and the cosine phase needs to be reduced. The total non-orthogonal angle between the sine phase and the cosine phase is 2Δθ, requiring:

[0027] 2ΔθP∈(0.1~0.2)·Accuracy index

[0028]

[0029] Among them, W Axef , W Ayef ——The component of the A-phase winding on the x-axis and y-axis, where A-phase represents the sine phase or cosine phase;

[0030] When W Ayef =0 means orthogonal; Solution: Increase or decrease one turn of the coil in slots 2 or 4, so that:

[0031]

[0032] Wherein, n = 1 or 2;

[0033] k i ——The coil number in the slot being adjusted;

[0034] Z0——Number of slots in the outer stator of the unit motor;

[0035] W A ' yef ——The component of phase A winding on the y-axis after adjustment.

[0036] Compared with the prior art, the beneficial effects of the utility model are:

[0037] 1. Compared with the traditional double-layer short-distance winding and equal-turn concentrated winding structure, the type III sinusoidal winding structure proposed by the utility model can effectively reduce the THD of the output potential of the signal winding and greatly improve the accuracy of this type of rotary transformer. After experimental testing, the zero position error is only 5";

[0038] 2. Compared with other types of dual-channel coarse-fine coupling rotary transformers (coarse-fine machine parallel structure, vertical structure, etc.), the common magnetic circuit coarse-fine coupling structure proposed in the utility model greatly reduces the structural complexity and improves the material utilization rate, space utilization rate and operation reliability;

[0039] 3. Taking into account multiple objectives such as processing technology, application size restrictions and accuracy indicators, the 32-pole 44-slot matching ratio adopted by the high-precision type III sinusoidal winding common magnetic circuit coarse-fine coupled winding rotary transformer proposed in the utility model is the optimal pole-slot matching relationship under these multiple objectives.

[0040] In summary, the III-type sinusoidal winding structure of the utility model can be directly applied to the winding structures of various types of rotary transformers such as reluctance rotary transformers and wound-wire rotary transformers. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 Schematic diagram of zero position error of the resolver;

[0042] Figure 2 It is a schematic diagram of a high-precision type III sinusoidal winding common magnetic circuit coarse-fine coupled winding rotary transformer of the utility model;

[0043] Figure 3 It is a schematic diagram of the winding method; among which: Figure 3 (a) is a schematic diagram of the winding method of the 1X-rough machine excitation winding; Figure 3 (b) is a schematic diagram of the winding method of the 1X-rough machine signal winding; Figure 3 (c) is a schematic diagram of the winding method of the 16X-precision machine excitation winding; Figure 3 (d) is a schematic diagram of the winding method of the 16X-precision machine signal winding;

[0044] The names and reference numerals of the components involved in the above drawings are as follows:

[0045] 16X-precision machine cosine signal winding 101, 16X-precision machine sine signal winding 102, 1X-rough machine sine signal winding 103, 1X-rough machine cosine signal winding 104, outer stator 105, inner rotor 106, 16X-precision machine excitation winding 107, 1X-rough machine excitation winding 108. DETAILED DESCRIPTION

[0046] The technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0047] Specific implementation method 1: Figure 2 As shown, this embodiment describes a high-precision III-type sinusoidal winding common magnetic circuit coarse-fine coupling winding type rotary transformer, including an inner rotor 106 and an outer stator 105, the inner rotor 106 and the outer stator 105 are coaxial, and an air gap is provided between the two, and teeth and slots are provided at intervals on the outer circular surface of the inner rotor 106 and the inner circular surface of the outer stator 105;

[0048] The teeth of the inner rotor 106 are respectively wound with a 1X-rough machine excitation winding 108 (1X-: represents 1 pair of poles) and a 16X-fine machine excitation winding 107 (16X- represents 16 pairs of poles). The 1X-rough machine excitation winding 108 is firstly embedded, and after the winding is completed at the bottom of the slot of the inner rotor 106, the 16X-fine machine excitation winding 107 is then embedded. The 1X-rough machine excitation winding 108 adopts a type II sinusoidal winding, and the 16X-fine machine excitation winding 107 adopts a double-layer short-distance winding.

[0049] The teeth of the outer stator 105 are respectively wound with a 1X-coarse machine signal winding and a 16X-fine machine signal winding. The 1X-coarse machine signal winding is composed of a 1X-coarse machine sine signal winding 103 and a 1X-coarse machine cosine signal winding 104, and the 16X-fine machine signal winding is composed of a 16X-fine machine sine signal winding 102 and a 16X-fine machine cosine signal winding 101. The 1X-coarse machine sine signal winding 103 is composed of a 1X-coarse machine sine signal winding 104 and a 16X-fine machine cosine signal winding 101. 03 and 1X-rough machine cosine signal winding 104 are embedded first, and after winding at the bottom of the slot of the outer stator 105, the 16X-fine machine sine signal winding 102 is embedded again, and after winding in the middle of the slot of the outer stator 105, the 16X-fine machine cosine signal winding 101 is embedded last and wound near the slot of the outer stator 105; both 1X-rough machine signal winding and 16X-fine machine signal winding adopt Type III sine winding.

[0050] The sinusoidal winding is a winding in which the turns of the coil in the slot are distributed according to the sinusoidal regularity of the spatial angle of each slot. The purpose is to make the distribution of the air gap magnetic potential close to the sine and eliminate the higher harmonics in the magnetic potential and electric potential. The type III sinusoidal winding is a sinusoidal concentrated winding. In order to further weaken the higher harmonics of the output signal and improve the accuracy of the rotary transformer, the utility model adopts an improved type III sinusoidal winding.

[0051] The utility model has tried to produce a prototype of a 32-pole 44-slot common magnetic circuit coarse-fine coupled winding rotary transformer. Figure 2As shown, the outer diameter of the outer stator 105 is 54 mm, the inner diameter of the outer stator 105 is 37.6 mm, the outer diameter of the inner rotor 106 is 36.4 mm, the inner diameter of the inner rotor 106 is 20 mm, the number of unit motors t=4, the input impedance is not less than 200Ω, and the excitation frequency is 10 kHz. The outer diameter and the inner diameter both represent diameters.

[0052] After analytical calculation and FEM simulation analysis, the number of turns of each winding in the unit motor of the common magnetic circuit coarse-fine coupled winding rotary transformer of the utility model is obtained as follows:

[0053] The number of winding turns corresponding to the 8 slots of the 1X-rough machine excitation winding 108 (using type II sinusoidal winding) is: 21-20-18-16-13-10-6-2;

[0054] The number of winding turns corresponding to the 11 slots of the 1X-rough machine signal winding (using type III sinusoidal winding) is:

[0055] Sine phase: 11-11-10-10-9-8-7-5-4-2-1;

[0056] Cosine phase: 11-1-2-4-5-7-8-9-10-10-11;

[0057] The number of turns of the 16X-precision machine excitation winding 107 (using double-layer short-distance winding) is: 26;

[0058] The number of winding turns corresponding to the 11 slots of the 16X-precision machine signal winding (using type III sinusoidal winding) is:

[0059] Sine phase: 32-3-37-45-22-16-43-40-10-28-46;

[0060] Cosine phase: 32-46-28-10-40-43-16-22-45-37-3.

[0061] The arrangement position relationship of each winding of the unit motor is as follows:

[0062] The 1X-coarse machine excitation winding 108 is first embedded in the slot of the inner rotor 106 and wound into a single-layer II type sinusoidal winding (corresponding to Figure 2 The innermost layer of the inner rotor 106, i.e., the first layer from the center point outward. The minus sign in the circle represents that the 1X-coarse machine excitation winding coil passes through the inner rotor, and the plus sign in the circle represents that the 1X-coarse machine excitation winding coil passes through the inner rotor 106);

[0063] The 16X-precision machine excitation winding 107 is embedded in the slot of the inner rotor 106 and wound into a double-layer short-distance winding (corresponding to Figure 2 The outermost layer of the inner rotor 106, i.e., the second layer from the center point outward. The hollow circle represents that the 16X-precision machine excitation winding coil passes through the inner rotor, and the + sign in the circle represents that the 16X-precision machine excitation winding coil passes through the inner rotor 106);

[0064] The 1X-coarse machine signal winding is first embedded in the slot of the outer stator 105 and wound into a type III sinusoidal winding. The 1X-coarse machine sinusoidal signal winding 103 and the 1X-coarse machine cosine signal winding 104 form a double-layer winding (located at Figure 2 The innermost layer of the outer stator 105, i.e., the fifth layer from the center point outward), viewed in the counterclockwise direction, the winding on the left side of each slot of the double-layer winding embedded in the outer stator 105 is the 1X-coarse machine sine signal winding 103, and the winding on the right side of each slot of the double-layer winding embedded in the outer stator 105 is the 1X-coarse machine cosine signal winding 104 (wherein, the innermost hollow circle of the outer stator 105 represents that the 1X-coarse machine signal winding coil passes out of the outer stator, and the + sign in the innermost circle of the outer stator 105 represents that the 1X-coarse machine signal winding coil passes into the outer stator 105);

[0065] The 16X-precision machine signal winding is embedded in the slot of the outer stator 105. The 16X-precision machine sine signal winding 102 and the 16X-precision machine cosine signal winding 101 of the 16X-precision machine signal winding are both wound as double-layer III type sine windings. During winding, the 16X-precision machine sine signal winding 102 is located in the second layer of the outer stator 105, that is, adjacent to the 1X-rough machine signal winding (such as Figure 2 16X-precision cosine signal winding 101 is located at the outermost layer of the outer stator 105, that is, adjacent to the 16X-precision sine signal winding 102 (as shown in FIG. Figure 2 As shown, that is, the third layer from the center point outward. Among them, the hollow circles on the second layer and the outermost layer of the outer stator 105 represent that the 16X-precision machine signal winding coil passes out of the outer stator 105, and the + sign in the circles on the second layer and the outermost layer of the outer stator 105 represents that the 16X-precision machine signal winding coil passes into the outer stator 105).

[0066] For the high-precision III-type sinusoidal winding common magnetic circuit coarse-fine coupled winding rotary transformer of the utility model, the calculation formula for the number of coil turns in each slot in the III-type sinusoidal winding is:

[0067]

[0068] Among them, N si 、Nci ——Number of turns of the winding corresponding to the i-th slot of the sine and cosine. The starting position of the slot is arbitrarily selected and is arranged in sequence in a clockwise direction;

[0069] N——maximum number of winding turns;

[0070] Z s ——Number of stator slots of resolver;

[0071] P——The number of pole pairs of the resolver.

[0072] The utility model simultaneously considers various factors that cause the error of the resolver (this design considers the influence of these factors on the accuracy, and after continuous iterative optimization, the current solution is the best solution obtained), which are:

[0073] 1. The problem of rounding the number of turns of type III sinusoidal winding;

[0074] 2. Problems with the matching of stator and rotor teeth;

[0075] 3. The problem of orthogonality between the axis of the harmonic winding and the axis of the fundamental winding of the 2Z0±1th (21st and 23rd in this utility model) tooth of the III-type sinusoidal winding fractional slot;

[0076] 4. The relationship between the number of unit motors t and the number of stator slots Z0 in the unit motor, that is, the relationship between magnetic circuit division and motor compensation.

[0077] The winding vector of the sine phase and the winding vector of the cosine phase are plotted on the xy coordinate axis. When the two-phase windings are strictly orthogonal, the vectors coincide with the x-axis and the y-axis respectively. Otherwise, there is a difference angle Δθ in the opposite direction between the x-axis and the y-axis. Since the number of turns of the type III sinusoidal winding needs to be rounded, orthogonal error will inevitably occur. Therefore, it is necessary to reduce the difference angle Δθ between the sine phase and the cosine phase. The total non-orthogonal angle between the sine phase and the cosine phase is 2Δθ, requiring:

[0078] 2ΔθP∈(0.1~0.2)·Accuracy index

[0079]

[0080] Among them, W Axef , W Ayef ——Components of the A-phase winding on the x-axis and y-axis; A-phase represents the sine phase or cosine term;

[0081] When W Ayef =0, it is orthogonal; Solution: Increase or decrease one turn of the coil in 2 or 4 slots (the number of slots must be a multiple of 2), so that:

[0082]

[0083] Wherein, n = 1 or 2;

[0084] k i ——The coil number in the slot being adjusted;

[0085] Z0——Number of slots in the outer stator of the unit motor;

[0086] W A ' yef ——The component of phase A winding on the y-axis after adjustment.

[0087] Note that the number of turns of the positive and negative windings of the sine and cosine two-phase windings must be equal.

[0088] like Figure 3 (a)- Figure 3 (d) are schematic diagrams of 1X-excitation winding (a), 1X-signal winding (b), 16X-excitation winding (c) and 16X-signal winding (d). A and X are two lead terminals of a phase winding.

[0089] The winding method of the 1X-rough machine excitation winding is: the winding is wound in from the slot between teeth No. 1 and No. 2, with tooth No. 9 as the center, and a large circle is wound out from the slot between teeth No. 16 and No. 17. At this point, the coil is the outermost circle of the winding wound clockwise, and the corresponding number of turns needs to be wound; then it is wound in from the slot between teeth No. 2 and No. 3, still with tooth No. 9 as the center, and it is wound out from the slot between teeth No. 15 and No. 16. At this point, the coil is the secondary outer circle of the winding wound clockwise, and the corresponding number of turns needs to be wound, and the rule is the same, and so on, until the corresponding number of turns are wound around tooth No. 9, and the clockwise winding is completed. Next, start to wind the remaining coils counterclockwise. The winding is wound into the slot between teeth No. 25 and No. 26, and with tooth No. 25 as the center, a small circle is wound out from the slot between teeth No. 24 and No. 25. At this point, the coil is the innermost circle of the winding wound counterclockwise, and the corresponding number of turns needs to be wound; then it is wound into the slot between teeth No. 26 and No. 27, and still with tooth No. 25 as the center, it is wound out from the slot between teeth No. 23 and No. 24. At this point, the coil is the sub-inner circle of the winding wound clockwise, and the corresponding number of turns needs to be wound. The rule is the same, and so on, until the counterclockwise winding is centered on tooth No. 25, wound into the slot between teeth No. 32 and No. 1, and then wound out from the slot between teeth No. 17 and No. 18, and the counterclockwise winding is completed (there are only coil edges represented by solid lines in the slot, which is a single-layer winding).

[0090] The winding method of the 1X-coarse machine signal winding is: the winding is wound in from the slot between teeth No. 1 and No. 2, with tooth No. 12 as the center, and a large circle is wound out from the slot between teeth No. 22 and No. 23. At this point, the coil is the outermost circle of the winding wound clockwise, and the corresponding number of turns needs to be wound; then it is wound in from the slot between teeth No. 2 and No. 3, still with tooth No. 12 as the center, and it is wound out from the slot between teeth No. 21 and No. 22. At this point, the coil is the secondary outer circle of the winding wound clockwise, and the corresponding number of turns needs to be wound, and the rule is the same, and so on, until the corresponding number of turns are wound around tooth No. 12, and the clockwise winding is completed. Next, start to wind the remaining coils counterclockwise. The winding is wound into the slot between teeth No. 34 and No. 35, and with tooth No. 34 as the center, a small circle is wound out from the slot between teeth No. 33 and No. 34. At this point, the coil is the innermost circle of the winding wound counterclockwise, and the corresponding number of turns needs to be wound; then it is wound into the slot between teeth No. 35 and No. 36, and still with tooth No. 34 as the center, it is wound out from the slot between teeth No. 32 and No. 33. At this point, the coil is the sub-inner circle of the winding wound clockwise, and the corresponding number of turns needs to be wound, and the rule is the same, and so on, until the counterclockwise winding is centered on tooth No. 34, wound into the slot between teeth No. 44 and No. 1, and then wound out from the slot between teeth No. 23 and No. 24, and the counterclockwise winding is completed (there are only coil edges represented by solid lines in the slot, which is a single-layer winding).

[0091] The winding method of the 16X-Precision Machinery excitation winding is: the winding is wound in from the slot between teeth No. 44 and No. 1, corresponding to the coil edge represented by the solid line in the figure, and a fixed number of turns are wound around tooth No. 1, and it is wound out from the slot between teeth No. 1 and No. 2, and the first coil in the winding is wound; then it is wound in from the slot between teeth No. 2 and No. 3, and a fixed number of turns are wound around tooth No. 2, and it is wound out from the slot between teeth No. 1 and No. 2, and the second coil in the winding is wound. The same rule is followed, and so on. The number of turns of each coil in the winding is equal.

[0092] The winding method of the 16X-Precision Machine signal winding is: the winding is wound in from the slot between teeth No. 44 and No. 1, corresponding to the coil side indicated by the solid line in the figure, and the corresponding number of turns are wound around tooth No. 1, and then wound out from the slot between teeth No. 1 and No. 2, corresponding to the coil side indicated by the dotted line in the figure, and the first coil in the winding is wound; then the winding is wound in from the slot between teeth No. 2 and No. 3, corresponding to the coil side indicated by the dotted line in the figure, and the corresponding number of turns are wound around tooth No. 2, and then wound out from the slot between teeth No. 1 and No. 2, corresponding to the coil side indicated by the solid line in the figure, the rules are the same, and so on (the solid line side in the slot is the upper side, and the dotted line side is the lower side).

[0093] In the utility model, the winding structure and number of turns of the coarse-fine coupling are the optimal solutions of multiple objectives which comprehensively consider the slot filling rate, the minimum tolerance of the copper wire radius, the zero position accuracy and the similarity of the end resistances of the two-phase output windings.

[0094] The output potential of the signal winding is subjected to FFT analysis, and the sine phase output potential THD=0.02%. The main harmonic components are 7, 11, and 13 harmonics, but the proportion is very small. The cosine phase result is similar. After experimental testing, the zero position error is only 5". The utility model is used for motor speed and position signal detection in extremely harsh environments, which can greatly reduce the signal winding output potential THD and improve the accuracy performance of the rotary transformer.

[0095] The working principle of the common magnetic circuit coarse-fine coupling winding type rotary transformer of the utility model is: injecting high-frequency excitation current into the excitation winding to generate an induced potential E f Due to the mutual inductance between the excitation winding and the signal winding, when the rotary transformer rotates, the relative positions of the inner rotor 106 and the outer stator 105 are angularly offset, and the coupling factor of the mutual inductance also changes accordingly. Therefore, output potentials having a sine and cosine relationship with the rotor angle are induced in the two-phase signal windings (i.e., the sine signal winding and the cosine signal winding).

[0096] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other forms of assembly without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes within the meaning and scope of the equivalents of the claims be included in the present invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0097] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high-precision III-type sinusoidal winding common magnetic circuit coarse-fine coupling winding type rotary transformer, comprising an inner rotor (106) and an outer stator (105), wherein the inner rotor (106) and the outer stator (105) are coaxial and an air gap is provided between the inner rotor (106) and the outer stator (105), and teeth and slots are provided at intervals on the outer circumferential surface of the inner rotor (106) and the inner circumferential surface of the outer stator (105); characterized in that: The teeth of the inner rotor (106) are respectively wound with a 1X-rough machine excitation winding (108) and a 16X-fine machine excitation winding (107); the 1X-rough machine excitation winding (108) is firstly embedded with wire, and after the winding is completed at the bottom of the slot of the inner rotor (106), the 16X-fine machine excitation winding (107) is then embedded with wire; the 1X-rough machine excitation winding (108) adopts a type II sinusoidal winding, and the 16X-fine machine excitation winding (107) adopts a double-layer short-distance winding; The teeth of the outer stator (105) are respectively wound with a 1X-rough machine signal winding and a 16X-fine machine signal winding, wherein the 1X-rough machine signal winding is composed of a 1X-rough machine sine signal winding (103) and a 1X-rough machine cosine signal winding (104), and the 16X-fine machine signal winding is composed of a 16X-fine machine sine signal winding (102) and a 16X-fine machine cosine signal winding (101); the 1X-rough machine sine signal winding (10 3) and the 1X-rough machine cosine signal winding (104) are firstly embedded, and after winding at the bottom of the slot of the outer stator (105), the 16X-fine machine sine signal winding (102) is then embedded, and after winding at the middle of the slot of the outer stator (105), the 16X-fine machine cosine signal winding (101) is finally embedded and wound near the slot of the outer stator (105); the 1X-rough machine signal winding and the 16X-fine machine signal winding both use type III sine windings.

2. The high-precision type III sinusoidal winding common magnetic circuit coarse-fine coupled winding rotary transformer according to claim 1 is characterized in that: When the number of pole pairs is 16, the number of slots of the inner rotor (106) is 32, and the number of slots of the outer stator (105) is 44, the number of turns of each winding in the unit motor of the common magnetic circuit coarse-fine coupled winding type rotary transformer is as follows: The number of winding turns corresponding to the 8 slots of the 1X-rough machine excitation winding (108) is: 21-20-18-16-13-10-6-2; The number of winding turns corresponding to the 11 slots of the 1X-coarse machine signal winding is: Sine phase: 11-11-10-10-9-8-7-5-4-2-1; Cosine phase: 11-1-2-4-5-7-8-9-10-10-11; The number of turns of the 16X-precision machine excitation winding (107) is: 26; The number of winding turns corresponding to the 11 slots of the 16X-precision signal winding is: Sine phase: 32-3-37-45-22-16-43-40-10-28-46; Cosine phase: 32-46-28-10-40-43-16-22-45-37-3.

3. The high-precision type III sinusoidal winding common magnetic circuit coarse-fine coupled winding rotary transformer according to claim 2 is characterized in that: The calculation formula for the number of coil turns in each slot of a type III sinusoidal winding is: Among them, N si 、N ci ——Number of turns of the winding corresponding to the i-th slot of the sine and cosine. The starting position of the slot is arbitrarily selected and is arranged in sequence in a clockwise direction; N——maximum number of winding turns; Z s ——Number of stator slots of resolver; P——number of pole pairs of resolver; Since the number of turns of the type III sinusoidal winding needs to be rounded, orthogonal error will inevitably occur. Therefore, the difference angle Δθ between the sine phase and the cosine phase needs to be reduced. The total non-orthogonal angle between the sine phase and the cosine phase is 2Δθ, requiring: 2ΔθP∈(0.1~0.2)·Accuracy index Among them, W Axef , W Ayef ——The component of the A-phase winding on the x-axis and y-axis, where A-phase represents the sine phase or cosine phase; When W Ayef =0 means orthogonal; Solution: Increase or decrease one turn of the coil in slots 2 or 4, so that: Wherein, n = 1 or 2; k i ——The coil number in the slot being adjusted; Z0——Number of slots in the outer stator of the unit motor; W A ' yef ——The component of phase A winding on the y-axis after adjustment.

Images