Motor rotor measuring device and elevator car driving device

Abstract

The invention discloses a motor rotor measuring device, wherein the magnetic permeability of the measuring ring varies at intervals along the circumferential direction; the measuring body comprises a winding and an iron core; the iron core yoke is a circular ring with a notch; a plurality of iron core teeth are sequentially fixedly connected to the same arc surface of the iron core yoke; the angle between the center lines of any two iron core teeth is less than 180 O ; The winding is wound on the core teeth or arranged in the core slots; the measuring ring is used to be fixedly installed on the rotating part of the motor; the measuring body is used to be installed and fixed on the main body of the motor; the measuring ring is located on the side of the measuring body with the core teeth, and the tooth tops of the multiple core teeth have a radial gap with the measuring ring; the measuring body is used to sense the rotation angle signal of the measuring ring. The present invention also discloses an elevator car drive device. The present invention can obtain information on the movement and / or position of the motor rotor, and it is convenient to remove or install the measuring body separately from the motor, which is convenient for on-site maintenance of the motor, has low production cost, excellent economy, and high reliability in environmental tolerance.

Description

Technical Field

[0001] The invention relates to elevator technology, and in particular to a motor rotor measuring device and an elevator car driving device. Background Art

[0002] The operation of an elevator traction motor usually depends on the information of the movement and / or position of the rotor in the motor. Therefore, it is generally necessary to set a measuring device on the elevator traction motor to obtain the information of the movement and / or position of the rotor.

[0003] Chinese invention patent publication CN102648142B discloses an elevator, which is provided with a measuring device for measuring the position and / or movement of a rotor of a motor, the measuring device comprising a magnetic induction belt and a reader; the magnetic induction belt is attached to the rotating part of the motor and is assembled to rotate around the rotating shaft of the rotor, the intensity of the magnetic field generated by the magnetic induction belt varies approximately sinusoidally along the longitudinal direction of the magnetic induction belt; the reader senses the magnetism varying along the longitudinal direction of the magnetic induction belt, and is installed on the driving pulley guard plate close to the magnetic induction belt, which is conducive to flexibly arranging the measuring device on the elevator, but the measuring device and the elevator have the following problems:

[0004] First, a special magnetic induction belt is needed. The conditions that the magnetic induction belt must meet include that the intensity of the magnetic field generated by the magnetic induction belt varies sinusoidally along the longitudinal direction of the magnetic induction belt and the N and S magnetic fields of the magnetic induction belt must have high consistency. The magnetic induction belt that meets such requirements is difficult to produce and has high production costs during processing and magnetization. Currently, only a few foreign manufacturers are capable of producing it, and the price is expensive.

[0005] Second, the magnetic induction belt is magnetic and easily absorbs impurities such as iron filings. If it absorbs impurities, it will have a great impact on the performance. Therefore, there are high requirements for the assembly of the magnetic induction belt and its protection during on-site use, which complicates the actual assembly and use.

[0006] Third, elevator traction motors usually need to have a long service life, generally more than 20 years. During this service life, the magnetic induction belt may lose magnetism or partially lose magnetism, causing performance degradation. If the magnetic induction belt needs to be replaced at the site of use, it will consume a lot of manpower and material resources.

[0007] Fourth, the magnetic induction belt reader needs to be equipped with highly sensitive magnetic induction elements and chips and other devices. Currently, only a few foreign manufacturers are capable of producing such highly sensitive elements and chips and other devices, and they are expensive. Summary of the invention

[0008] The technical problem to be solved by the present invention is to be able to obtain information on the movement and / or position of the motor rotor, to facilitate the removal or installation of the measuring body from the motor separately, to facilitate on-site maintenance of the motor, to have low manufacturing cost, excellent economy, and high reliability in environmental tolerance.

[0009] In order to solve the above technical problems, the present invention provides a motor rotor measuring device, which includes a measuring ring 2 and a measuring body 10;

[0010] The magnetic permeability of the measuring ring 2 varies at intervals along the circumferential direction;

[0011] The measuring body 10 includes a winding 11 and an iron core 16;

[0012] The winding 11 includes an input winding 12 and an output winding;

[0013] The iron core 16 includes a plurality of iron core teeth 17 and an iron core yoke 19;

[0014] The core yoke 19 is a circular ring with a notch;

[0015] The plurality of core teeth 17 are sequentially fixedly connected to the same arc surface of the core yoke 19;

[0016] The space enclosed by the arc surface of two adjacent core teeth 17 and the core yoke 19 forms a core slot 18;

[0017] The angle between the center lines of any two core teeth 17 is less than 180 O ;

[0018] The input winding 12 and the output winding are wound on at least one core tooth 17 or arranged in at least one core slot 18;

[0019] The measuring ring 2 is used to be fixedly mounted on the rotating part of the motor 21 and rotates around the rotation axis 25 together with the rotor 22 of the motor 21;

[0020] The measuring body 10 is used to be mounted and fixed on the main body of the motor 21, and the rotating part rotates relative to the main body around the rotation axis 25;

[0021] The measuring ring 2 is located on the side of the measuring body 10 having the core teeth 17, and the tooth tops 17a of the plurality of core teeth 17 have a radial gap with the measuring ring 2;

[0022] The measuring body 10 is used to sense the rotation angle signal of the measuring ring 2 .

[0023] Preferably, the magnetic permeability of the measuring ring 2 varies at uniform intervals along the circumferential direction.

[0024] Preferably, the magnetic permeability of the outer peripheral surface of the measuring ring 2 varies at intervals along the circumferential direction;

[0025] The plurality of core teeth 17 are sequentially fixedly connected to the inner arc surface of the core yoke 19;

[0026] The space enclosed by two adjacent core teeth 17 and the inner arc surface of the core yoke 19 forms a core slot 18;

[0027] The tooth tops 17a of the plurality of core teeth 17 are opposite to the outer peripheral surface of the measuring ring 2 and have a radial gap.

[0028] Preferably, the magnetic permeability of the inner circumferential surface of the measuring ring 2 varies at intervals along the circumferential direction;

[0029] The plurality of core teeth 17 are sequentially fixedly connected to the outer arc surface of the core yoke 19;

[0030] The space enclosed by two adjacent core teeth 17 and the outer arc surface of the core yoke 19 forms a core slot 18;

[0031] The tooth tops 17a of the plurality of core teeth 17 are opposite to the inner circumference of the measuring ring 2 and have a radial gap therebetween.

[0032] Preferably, an AC excitation voltage is applied to the input winding 12, and an AC induced voltage is generated in the output winding;

[0033] When the measuring ring 2 rotates around the rotation axis 25, the amplitude of the AC induced voltage generated by the output winding changes accordingly due to the interval change of the circumferential magnetic permeability of the measuring ring 2.

[0034] Preferably, when the measuring ring 2 rotates around the rotation axis 25, the amplitude envelope of the AC induced voltage generated by the output winding is a periodically changing waveform due to the interval change in the circumferential magnetic permeability of the measuring ring 2.

[0035] Preferably, when the measuring ring 2 rotates around the rotation axis 25, the amplitude envelope of the AC induced voltage generated by the output winding is a sine function waveform, a cosine function waveform or a triangular waveform due to the interval change in the circumferential magnetic permeability of the measuring ring 2.

[0036] Preferably, the output winding has two windings, namely a first output winding 13 and a second output winding 14;

[0037] The input winding 12 is wound on at least two core teeth 17 or arranged in at least two core slots 18;

[0038] The inner circumference or outer circumference of the measuring ring 2 is uniformly formed with a plurality of protrusions 3 along the circumferential direction;

[0039] The measuring ring 2 rotates around the rotation axis 25, and the multiple protrusions 3 of the measuring ring 2 successively pass through the tooth tops 17a of the multiple core teeth 17 of the core 16 of the measuring body 10, and the amplitude of the AC induced voltage generated by the first output winding 13 and the second output winding 14 changes accordingly;

[0040] When the AC excitation voltage is applied to the input winding 12, it is: E_12(t)=E*sin(2*π*f*t);

[0041] The AC induced voltage generated by the first output winding 13 is: E_13(t)=K*E*sin(Z*θ)*sin(2*π*f*t);

[0042] The AC induced voltage generated by the second output winding 14 is: E_14(t)=K*E*cos(Z*θ)*sin(2*π*f*t);

[0043] Wherein, θ is the angle of rotation of the measuring ring 2 around the rotation axis 25, E is a constant, f is the frequency of the AC excitation voltage changing with time t, K is a constant, Z is the number of protrusions of the measuring ring, Z*α=360o, and α is the angle between adjacent protrusions 3.

[0044] Preferably, an AC excitation voltage is applied to the input winding 12, and an AC induced voltage is generated in the output winding;

[0045] When the measuring ring 2 rotates around the rotation axis 25, the phase angle of the AC induced voltage generated by the output winding changes accordingly due to the interval change in the circumferential magnetic permeability of the measuring ring 2.

[0046] Preferably, the input winding 12 has two windings, a first input winding 32 and a second input winding 33;

[0047] The output winding has two windings, a first output winding 13 and a second output winding 14;

[0048] The measuring ring 2 rotates around the rotation axis 25, and the multiple protrusions 3 of the measuring ring 2 successively pass through the tooth tops 17a of the multiple core teeth 17 of the core 16 of the measuring body 10, and the phase angle of the AC induced voltage generated by the first output winding 13 and the second output winding 14 changes accordingly.

[0049] Preferably, the inner circumference or outer circumference of the measuring ring 2 is uniformly formed with a plurality of protrusions 3 along the circumferential direction;

[0050] The input winding 12 is wound on at least two core teeth 17 or arranged in at least two core slots 18;

[0051] When the AC excitation voltage applied to the first input winding 32 is: E_32(t)=E*sin(2*π*f*t); and the AC excitation voltage applied to the second input winding 33 is: E_33(t)=E*cos(2*π*f*t);

[0052] Then the AC induced voltage generated by the first output winding 13 is: E_13(t)=K*E*sin(2*π*f*t-β);

[0053] The AC induced voltage generated by the second output winding 14 is: E_14(t)=K*E*cos(2*π*f*t-β);

[0054] β=Z*θ;

[0055] Among them, β is the phase angle of the AC induced voltage generated by the output winding, Z is the number of protrusions of the measuring ring, θ is the angle of rotation around the rotation axis, f is the frequency of the AC excitation voltage changing with time t, E is a constant, and K is a constant.

[0056] Preferably, the raised portion 3 of the measuring ring 2 is made of a material with a relative magnetic permeability greater than 10.

[0057] Preferably, the surface shape of the protrusion 3 is arched.

[0058] Preferably, the minimum value of the radial clearance between the tooth top 17a of the core tooth 17 of the measuring body 10 and the measuring ring 2 is 0.1 mm to 5 mm.

[0059] Preferably, the minimum radial clearance between the tooth top 17a of the core tooth 17 of the measuring body 10 and the measuring ring 2 is 0.4 mm to 1.5 mm.

[0060] Preferably, a plurality of core teeth 17 are uniformly fixedly connected to the same arc surface of the core yoke 19 in sequence.

[0061] Preferably, the entire measuring ring 2 is made of a material with a relative magnetic permeability greater than 10.

[0062] Preferably, the measuring ring 2 is entirely formed by stacking silicon steel sheets.

[0063] Preferably, the winding 11 is made of enameled wire.

[0064] Preferably, the core 16 of the measuring body 10 is made of a material with a relative magnetic permeability greater than 10.

[0065] Preferably, the core 16 of the measuring body 10 is formed by stacking silicon steel sheets.

[0066] Preferably, each winding is wound on the core teeth 17 in a concentrated winding form, or arranged in the core slots 18 in a distributed embedded form;

[0067] In order to solve the above technical problems, the present invention provides an elevator car driving device including the above motor rotor measuring device, which also includes an elevator traction motor;

[0068] The rotating part of the elevator traction motor 21 includes a sheave 26;

[0069] The rope wheel 26 is rotatably mounted on the main body 30 of the elevator traction motor via a bearing 29, and is used to drive the elevator rope;

[0070] The measuring body 10 is fixedly assembled with the main body 30 of the elevator traction motor 21;

[0071] The measuring ring 2 is assembled with the rotating part of the elevator traction motor 21 .

[0072] Preferably, the rotor 22 of the elevator traction motor is provided with a mounting surface 24;

[0073] The measuring ring 2 is assembled on the mounting surface 24 of the rotor by its inner peripheral surface 4, and is thus assembled together with the rotating part of the elevator traction motor.

[0074] Preferably, the elevator traction motor 21 is a permanent magnet synchronous motor with permanent magnets mounted on a rotor 22 .

[0075] Preferably, the stator 27 and the rotor 22 of the elevator traction motor 21 are arranged opposite to each other, and a disc-shaped air gap surface perpendicular to the rotation axis 25 is formed between the rotor 22 and the stator 27, or a cylindrical air gap surface with the rotation axis 25 as the axis is formed between the rotor 22 and the stator 27 of the elevator traction motor 21.

[0076] Preferably, the elevator traction motor is equipped with a sheave guard plate 23;

[0077] The sheave guard plate 23 is fixed to the main body 30 of the elevator traction motor 21 and extends to the front side of the sheave 26; the sheave 26 is accommodated between the main body 30 and the sheave guard plate 23;

[0078] The measuring body 10 is assembled and fixed on the rope wheel guard plate 23 .

[0079] Preferably, the measuring body 10 and the rope wheel guard plate 23 are assembled together through a connecting piece 9.

[0080] Preferably, the core yoke 19 and the sheave guard plate 23 of the measuring body 10 are connected by the connecting piece 9, and the measuring body 10 is assembled on the main body 30 of the elevator traction motor 21.

[0081] Preferably, the rope pulley guard plate 23 corresponds to the opening at the measuring body 10 .

[0082] Preferably, there is at least one fixed connection point between the sheave guard 23 and the main body 30.

[0083] Preferably, the connection point between the sheave guard 23 and the main body portion 30 is arranged at a lower position and / or a middle position of the main body portion 30 .

[0084] Preferably, the rope pulley guard plate 23 is a structure formed by bending a sheet metal part.

[0085] Preferably, the core yoke 19 of the measuring body 10 and the main body 30 of the elevator traction motor are assembled together through the connecting piece 9, and the measuring body 10 is assembled on the main body 30 of the elevator traction motor.

[0086] Preferably, the main body portion 30 has an opening corresponding to the measuring body 10 .

[0087] The motor rotor measuring device of the present invention is used to be assembled on the motor to obtain the information of the movement and / or position of the rotor 22. The measuring ring 2 and the measuring body 10 are separate components. The measuring ring 2 can be flexibly assembled at the most advantageous place for space saving or structural layout of the rotating part of the motor 21, and the installation point of the measuring body 10 relative to the measuring ring 2 can be flexibly selected at the most advantageous place for assembly and maintenance. If it is necessary to inspect, maintain or replace the measuring body 10 at the site of use, since the core yoke 19 is a circular ring with a notch, the measuring body 10 can be easily removed or installed separately from the motor without disassembling other parts of the motor 21, which brings more convenience to on-site maintenance work, especially in occasions where the on-site working space is relatively small. Moreover, the motor rotor measuring device uses a measuring body 10 having an iron core 16, an input winding 12, and an output winding. The movement and / or position information of the rotor 22 is obtained by sensing the movement of the measuring ring 2 relative to the measuring body 10 in the circumferential direction. It does not require expensive devices such as magnetic induction belts and chips, which have high requirements on the environment such as temperature, humidity, and oil pollution. It reduces the production cost and has better economy. It eliminates the risk caused by the decrease of the magnetism of the magnetic induction belt, has higher reliability in endurance of the environment, and further simplifies the assembly and use of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0089] Figure 1 is a three-dimensional schematic diagram of an embodiment of an elevator car driving device of the present invention;

[0090] Figure 2 yes Figure 1 Front view of

[0091] Figure 3 yes Figure 2 AA section view;

[0092] Figure 4 yes Figure 2 The schematic diagram after the sheave guard is omitted;

[0093] Figure 5 yes Figure 4 A three-dimensional schematic diagram of

[0094] Figure 6 is a front view of an embodiment of a motor rotor measuring device of the present invention;

[0095] Figure 7 It is a voltage waveform diagram of the input winding and the output winding of an embodiment of the motor rotor measuring device of the present invention;

[0096] Figure 8 is a front view of another embodiment of the elevator car driving device of the present invention;

[0097] Fig. 9 yes Figure 8 AA section view;

[0098] Fig.10 is a front view of another embodiment of the motor rotor measuring device of the present invention;

[0099] Fig.11 It is a voltage waveform diagram of the input winding and the output winding of a measuring device of another embodiment of the motor rotor measuring device of the present invention;

[0100] Fig.12 yes Fig.11 An enlarged view of the voltage waveform at a certain phase angle.

[0101] The accompanying drawings are described as follows:

[0102] 1 measuring device; 2 measuring ring; 3 raised part; 4 inner circumference; 9 connecting piece; 10 measuring body; 11 winding; 12 input winding; 32 first input winding; 33 second input winding; 13 first output winding; 14 second output winding; 16 iron core; 17 iron core teeth; 17a tooth top; 18 iron core slot; 19 iron core yoke; 21 motor; 22 rotor; 23 sheave guard plate; 24 mounting surface; 25 rotation axis; 26 sheave; 27 stator; 28 air gap surface; 29 bearing; 30 main body. DETAILED DESCRIPTION

[0103] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0104] Embodiment 1

[0105] like Figures 1 to 6 and Figures 8 to 10 As shown, it includes a measuring ring 2 and a measuring body 10;

[0106] The magnetic permeability of the measuring ring 2 varies at intervals along the circumferential direction;

[0107] The measuring body 10 includes a winding 11 and an iron core 16;

[0108] The winding 11 includes an input winding 12 and an output winding;

[0109] The iron core 16 includes a plurality of iron core teeth 17 and an iron core yoke 19;

[0110] The core yoke 19 is a circular ring with a notch;

[0111] The plurality of core teeth 17 are sequentially fixedly connected to the same arc surface of the core yoke 19;

[0112] The space enclosed by the arc surface of two adjacent core teeth 17 and the core yoke 19 forms a core slot 18;

[0113] The angle between the center lines of any two core teeth 17 is less than 180 O ;

[0114] The input winding 12 and the output winding are wound on at least one core tooth 17 or arranged in at least one core slot 18;

[0115] The measuring ring 2 is used to be fixedly mounted on the rotating part of the motor 21 and rotates around the rotation axis 25 together with the rotor 22 of the motor 21;

[0116] The measuring body 10 is used to be mounted and fixed on the main body of the motor 21, and the rotating part rotates relative to the main body around the rotation axis 25;

[0117] The measuring ring 2 is located on the side of the measuring body 10 having the core teeth 17, and the tooth tops 17a of the plurality of core teeth 17 have a radial gap with the measuring ring 2;

[0118] The measuring body 10 is used to sense the rotation angle signal of the measuring ring 2 .

[0119] Preferably, the magnetic permeability of the measuring ring 2 varies at uniform intervals along the circumferential direction.

[0120] The motor rotor measuring device of the first embodiment is used to be assembled on the motor to obtain the information of the movement and / or position of the rotor 22. The measuring ring 2 and the measuring body 10 are separate components. The measuring ring 2 can be flexibly assembled at the most advantageous place for space saving or structural layout of the rotating part of the motor 21, and the installation point of the measuring body 10 relative to the measuring ring 2 can be flexibly selected at the most advantageous place for assembly and maintenance. If the measuring body 10 needs to be inspected, maintained or replaced at the site of use, since the core yoke 19 is a circular ring with a notch, the measuring body 10 can be easily removed or installed from the motor alone without disassembling other parts of the motor 21, which brings more convenience to on-site maintenance work, especially in occasions where the on-site working space is relatively small. Moreover, the motor rotor measuring device uses a measuring body 10 having an iron core 16, an input winding 12, and an output winding. The movement and / or position information of the rotor 22 is obtained by sensing the movement of the measuring ring 2 relative to the measuring body 10 in the circumferential direction. It does not require expensive devices such as magnetic induction belts and chips, which have high requirements on the environment such as temperature, humidity, and oil pollution. It reduces the production cost and has better economy. It eliminates the risk caused by the decrease of the magnetism of the magnetic induction belt, has higher reliability in endurance of the environment, and further simplifies the assembly and use of the product.

[0121] Embodiment 2

[0122] Based on the motor rotor measuring device of the first embodiment, Figure 4 , Figure 6 As shown, the magnetic permeability of the outer peripheral surface of the measuring ring 2 varies at intervals along the circumferential direction;

[0123] The plurality of core teeth 17 are sequentially fixedly connected to the inner arc surface of the core yoke 19;

[0124] The space enclosed by two adjacent core teeth 17 and the inner arc surface of the core yoke 19 forms a core slot 18;

[0125] The tooth tops 17a of the plurality of core teeth 17 are opposite to the outer peripheral surface of the measuring ring 2 and have a radial gap.

[0126] Embodiment 3

[0127] Based on the motor rotor measuring device of the first embodiment, the magnetic permeability of the inner circumferential surface of the measuring ring 2 varies at intervals along the circumferential direction;

[0128] The plurality of core teeth 17 are sequentially fixedly connected to the outer arc surface of the core yoke 19;

[0129] The space enclosed by two adjacent core teeth 17 and the outer arc surface of the core yoke 19 forms a core slot 18;

[0130] The tooth tops 17a of the plurality of core teeth 17 are opposite to the inner circumference of the measuring ring 2 and have a radial gap therebetween.

[0131] Embodiment 4

[0132] Based on the motor rotor measuring device of the first embodiment, an AC excitation voltage is applied to the input winding 12, and an AC induced voltage is generated by the output winding;

[0133] The input winding 12 is wound on at least two core teeth 17 or arranged in at least two core slots 18;

[0134] When the measuring ring 2 rotates around the rotation axis 25, the amplitude of the AC induced voltage generated by the output winding changes accordingly due to the interval change of the circumferential magnetic permeability of the measuring ring 2.

[0135] Preferably, when the measuring ring 2 rotates around the rotation axis 25, the amplitude envelope of the AC induced voltage generated by the output winding is a periodically changing waveform due to the interval change in the circumferential magnetic permeability of the measuring ring 2.

[0136] Preferably, when the measuring ring 2 rotates around the rotation axis 25, the amplitude envelope of the AC induced voltage generated by the output winding is approximately a sine function waveform, a cosine function waveform, a triangular wave waveform, etc. due to the interval change in the circumferential magnetic permeability of the measuring ring 2.

[0137] Preferably, the output winding has two windings, namely, a first output winding 13 and a second output winding 14. The first output winding 13 and the second output winding 14 are both wound on at least one core tooth 17 or arranged in at least one core slot 18.

[0138] Preferably, the inner circumference or outer circumference of the measuring ring 2 is uniformly formed with a plurality of protrusions 3 along the circumferential direction;

[0139] The measuring ring 2 rotates around the rotation axis 25, and the multiple protrusions 3 of the measuring ring 2 successively pass through the tooth tops 17a of the multiple core teeth 17 of the core 16 of the measuring body 10, and the amplitude of the AC induced voltage generated by the first output winding 13 and the second output winding 14 changes accordingly.

[0140] When the AC excitation voltage is applied to the input winding 12, it is: E_12(t)=E*sin(2*π*f*t);

[0141] The AC induced voltage generated by the first output winding 13 is: E_13(t)=K*E*sin(Z*θ)*sin(2*π*f*t);

[0142] The AC induced voltage generated by the second output winding 14 is: E_14(t)=K*E*cos(Z*θ)*sin(2*π*f*t);

[0143] In the formula, θ is the angle of rotation of the measuring ring 2 around the rotation axis 25, E is a constant (the amplitude of the AC excitation voltage), f is the frequency of the AC excitation voltage changing with time t, K is a constant related to the setting of the number of turns of the input winding and the number of turns of the output winding, Z is the number of protrusions of the measuring ring, Z*α=360o, and α is the angle between adjacent protrusions 3.

[0144] Preferably, the raised portion 3 of the measuring ring 2 is made of a material with a relative magnetic permeability greater than 10.

[0145] Preferably, the surface shape of the protrusion 3 is arched.

[0146] like Figure 4 , Figure 6 As shown, when the input winding 12 is supplied with an AC excitation voltage, the amplitude envelope of the AC induced voltage generated by the first output winding 13 and the second output winding 14 changes by one cycle each time the measuring ring 2 rotates through an angle α corresponding to the distance D between adjacent protrusions 3, that is, the amplitude envelope of the AC induced voltage generated by the first output winding 13 and the second output winding 14 is a waveform that changes periodically, and N=Z, where Z is the number of protrusions 3 of the measuring ring 2, and N is the number of cycles T of the amplitude envelope change of the AC induced voltage during the process of the measuring ring 2 rotating 360o around the rotation axis. The amplitude K*E*sin(Z*θ) of the AC induced voltage E_13(t) generated by the first output winding 13 changes periodically according to a sine function waveform as the angle θ increases; the amplitude K*E*cos(Z*θ) of the AC induced voltage E_14(t) generated by the second output winding 14 changes periodically according to a cosine function waveform as the angle θ increases, as shown in FIG. Figure 7 For the convenience of illustration, Figure 7 The amplitudes of E_13(t) and E_14(t) are selected as constant K=1.

[0147] In the motor rotor measuring device of the fourth embodiment, an AC excitation voltage is passed through the input winding 12 to generate an excitation current and a magnetic flux. The magnetic flux passes through a closed magnetic circuit formed by at least two core teeth 17, a core yoke 19, a protrusion 3, a measuring ring 2, and a gap between the protrusion 3 and the tooth top 17a, and an AC induced voltage is generated on the first output winding 13 and the second output winding 14. The measuring ring 2 rotates around the rotation axis 25 together with the motor rotor, and several protrusions 3 of the measuring ring 2 successively pass through several tooth tops 17a of the measuring body 10, and the magnetic resistance of the closed magnetic circuit through which the magnetic flux passes changes, and the amplitude envelope of the AC induced voltage generated by the first output winding 13 and the second output winding 14 changes, thereby obtaining the motion and / or position information of the rotor. By using a mathematical processing method to process the amplitude envelope waveform signal, a higher measurement accuracy can be obtained.

[0148] Embodiment 5

[0149] Based on the motor rotor measuring device of the first embodiment, an AC excitation voltage is applied to the input winding 12, and an AC induced voltage is generated by the output winding;

[0150] The input winding 12 is wound on at least two core teeth 17 or arranged in at least two core slots 18;

[0151] When the measuring ring 2 rotates around the rotation axis 25, the phase angle of the AC induced voltage generated by the output winding changes accordingly due to the interval change in the circumferential magnetic permeability of the measuring ring 2.

[0152] Better, such as Fig. 9 , Fig.10 As shown, the input winding 12 has two windings, a first input winding 32 and a second input winding 33;

[0153] The output winding has two windings, a first output winding 13 and a second output winding 14;

[0154] The measuring ring 2 rotates around the rotation axis 25, and the multiple protrusions 3 of the measuring ring 2 successively pass through the tooth tops 17a of the multiple core teeth 17 of the core 16 of the measuring body 10, and the phase angle of the AC induced voltage generated by the first output winding 13 and the second output winding 14 changes accordingly.

[0155] Preferably, the inner circumference or outer circumference of the measuring ring 2 is uniformly formed with a plurality of protrusions 3 along the circumferential direction;

[0156] like Fig.11 , Fig.12 As shown, when the AC excitation voltage applied to the first input winding 32 is: E_32(t)=E*sin(2*π*f*t); and the AC excitation voltage applied to the second input winding 33 is: E_33(t)=E*cos(2*π*f*t);

[0157] Then the AC induced voltage generated by the first output winding 13 is: E_13(t)=K*E*sin(2*π*f*t-β);

[0158] The AC induced voltage generated by the second output winding 14 is: E_14(t)=K*E*cos(2*π*f*t-β);

[0159] β=Z*θ;

[0160] Among them, β is the phase angle of the AC induced voltage generated by the output winding, Z is the number of protrusions of the measuring ring, θ is the angle of rotation around the measuring axis, f is the frequency of the AC excitation voltage changing with time t, and E is a constant.

[0161] Preferably, the raised portion 3 of the measuring ring 2 is made of a material with a relative magnetic permeability greater than 10.

[0162] Preferably, the surface shape of the protrusion 3 is arched.

[0163] In the motor rotor measuring device of the fifth embodiment, an AC excitation voltage is applied to the first input winding 32 and the second input winding 33 to generate an excitation current and a magnetic flux. The magnetic flux passes through a closed magnetic circuit formed by at least two core teeth 17, a core yoke 19, a protrusion 3, a measuring ring 2, and a gap between the protrusion 3 and the tooth top 17a, and an AC induced voltage is generated on the first output winding 13 and the second output winding 14. The measuring ring 2 rotates around the rotation axis 25 together with the rotor 22, and the multiple protrusions 3 of the measuring ring 2 successively pass through the multiple tooth tops 17a of the measuring body 10. The magnetic resistance of the closed magnetic circuit through which the magnetic flux passes changes, and the phase angle of the AC induced voltage generated by the first output winding 13 and the second output winding 14 changes. The voltage waveform of each winding is shown in FIG. Fig.11 , Fig.12 , for the convenience of illustration, Fig.11 , Fig.12 The amplitude of E_13(t) and the amplitude of E_14(t) are constants K=1. The measuring body 10 can output a sine function waveform and a cosine function waveform with a phase angle β changing with the change of the rotation angle θ, thereby obtaining the motion and / or position information of the rotor. This method of using two sets of input windings and two sets of output windings to measure the rotation angle by using phase angle changes can obtain higher measurement accuracy, and the windings have the characteristics of redundancy, etc.

[0164] Embodiment 6

[0165] Based on the motor rotor measuring device of the first embodiment, the radial minimum value between the tooth top 17a of the core tooth 17 of the measuring body 10 and the measuring ring 2 is 0.1 mm to 5 mm.

[0166] Preferably, the minimum radial clearance between the tooth top 17a of the core tooth 17 of the measuring body 10 and the measuring ring 2 is 0.4 mm to 1.5 mm.

[0167] The radial gap between the tooth top 17a of the core tooth 17 of the measuring body 10 and the measuring ring 2 is equal and the minimum value is within the selected range, which can make the phase angle change or amplitude envelope change of the AC induced voltage generated by the output winding more regular.

[0168] Embodiment 7

[0169] Based on the motor rotor measuring device of the first embodiment, a plurality of core teeth 17 are uniformly fixedly connected to the same arc surface of the core yoke 19 in sequence.

[0170] Preferably, the entire measuring ring 2 is made of a material with a relative magnetic permeability greater than 10.

[0171] Preferably, the measuring ring 2 is entirely made of stacked silicon steel sheets. The measuring ring 2 made of stacked silicon steel sheets is strong and sturdy, has no magnetism, does not absorb iron filings and impurities, and can bring more convenience to assembly and use.

[0172] Preferably, the winding 11 is made of copper wire (such as enameled wire).

[0173] Preferably, the core 16 of the measuring body 10 is made of a material with a relative magnetic permeability greater than 10.

[0174] Preferably, the core 16 of the measuring body 10 is formed by stacking silicon steel sheets.

[0175] Preferably, each winding is wound on the core teeth 17 in a concentrated winding form, or is arranged in the core slots 18 in a distributed embedded form.

[0176] Embodiment 8

[0177] An elevator car driving device comprising the above motor rotor measuring device; Figures 1 to 5 and Figure 8 , Fig. 9 As shown, the elevator car driving device also includes an elevator traction motor 21;

[0178] The rotating part of the elevator traction motor 21 includes a sheave 26;

[0179] The rope wheel 26 is rotatably mounted on the main body 30 of the elevator traction motor 21 via a bearing 29, and is used to drive the elevator rope;

[0180] The measuring body 10 is fixedly assembled with the main body 30 of the elevator traction motor 21;

[0181] The measuring ring 2 is assembled with the rotating part of the elevator traction motor 21 , and the measuring ring 2 is adjacent to the measuring body 10 .

[0182] Preferably, the rotor 22 of the elevator traction motor is provided with a mounting surface 24;

[0183] The measuring ring 2 is assembled on the mounting surface 24 of the rotor 22 by its inner circumferential surface 4, and is thus assembled together with the rotating part of the elevator traction motor 21.

[0184] Preferably, the elevator traction motor 21 is a permanent magnet synchronous motor with permanent magnets mounted on a rotor 22, and the sheave 26 driving the elevator rope is integrated with the rotor 22;

[0185] The stator 27 and the rotor 22 of the elevator traction motor 21 are arranged opposite to each other, and a disc-shaped air gap surface 28 perpendicular to the rotation axis 25 is formed between the rotor 22 and the stator 27, or a cylindrical air gap surface with the rotation axis 25 as the axis is formed between the rotor 22 and the stator 27 of the elevator traction motor 21.

[0186] In the elevator car driving device of the eighth embodiment, the measuring ring 2 can be flexibly mounted at the most advantageous place for space saving or structural arrangement of the rotating part of the elevator traction motor 21, and the attachment point of the measuring body 10 relative to the measuring ring 2 can be flexibly selected at the most advantageous place for assembly and maintenance. If the measuring body 10 needs to be inspected, maintained or replaced at the elevator use site, the measuring body 10 can be conveniently removed from the radial direction alone without disassembling other parts of the elevator traction motor 21, which brings more convenience to the on-site inspection and maintenance work, especially in the occasions where the on-site working space is relatively small, such as the machine roomless elevator.

[0187] Embodiment 9

[0188] Based on the elevator car driving device of the eighth embodiment, Figures 1 to 5 As shown, the elevator traction motor 21 is equipped with a sheave guard plate 23;

[0189] The sheave guard plate 23 is fixed to the main body 30 of the elevator traction motor 21 and extends to the front side of the sheave 26; the sheave 26 is accommodated between the main body 30 and the sheave guard plate 23;

[0190] The measuring body 10 is assembled and fixed on the rope wheel guard plate 23 .

[0191] Preferably, the measuring body 10 and the rope wheel guard plate 23 are assembled together through a connecting piece 9 to facilitate assembly.

[0192] Preferably, the core yoke 19 and the sheave guard plate 23 of the measuring body 10 are connected by the connecting piece 9, and the measuring body 10 is assembled on the main part 30 (stationary part) of the elevator traction motor 21.

[0193] Preferably, the rope pulley guard 23 has a hole corresponding to the measuring body 10, so as to facilitate the separate removal of the measuring body 10 from the axial direction.

[0194] Preferably, there is at least one fixed connection point between the sheave guard 23 and the main body 30.

[0195] Preferably, the connection point between the rope sheave guard 23 and the main body 30 is arranged at the lower position and / or the middle position of the main body 30, etc., and the position of the connection point with the rope sheave guard 23 can be adjusted according to the structure of the main body 30 of the elevator traction motor 21.

[0196] Preferably, the sheave guard plate 23 is a structure formed by bending a sheet metal part, fixed to the main body 30 through a connection point, and extends to the side of the sheave 26, and the measuring body 10 is arranged on the side.

[0197] Embodiment 10

[0198] Based on the elevator car driving device of the eighth embodiment, Figure 8 , Fig. 9 As shown, the core yoke 19 of the measuring body 10 and the main body 30 of the elevator traction motor are assembled together through the connecting piece 9, and the measuring body 10 is assembled on the main body 30 of the elevator traction motor.

[0199] Preferably, the main body 30 has a hole corresponding to the measuring body 10, so that the measuring body 10 can be easily removed from the axial direction without disassembling other parts of the elevator traction motor 21, which can bring more convenience to on-site maintenance work.

[0200] The above description is only a preferred 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 motor rotor measuring device, characterized in that: It comprises a measuring ring (2) and a measuring body (10); The magnetic permeability of the measuring ring (2) varies at intervals along the circumferential direction; The measuring body (10) comprises a winding (11) and an iron core (16); The winding (11) comprises an input winding (12) and an output winding; The iron core (16) comprises a plurality of iron core teeth (17) and an iron core yoke (19); The core yoke (19) is in the shape of a ring with a notch; The plurality of core teeth (17) are sequentially fixedly connected to the same arc surface of the core yoke (19); A space enclosed by two adjacent core teeth (17) and the arc surface of the core yoke (19) forms a core slot (18); The angle between the center lines of any two core teeth (17) is less than 180°; An input winding (12) and an output winding are wound on at least one iron core tooth (17) or arranged in at least one iron core slot (18); The measuring ring (2) is used to be fixedly mounted on the rotating part of the motor (21) and rotates around the rotation axis (25) together with the rotor (22) of the motor (21); The measuring body (10) is used to be mounted and fixed on the main body of the motor (21), and the rotating part rotates relative to the main body around the rotation axis (25); The measuring ring (2) is located on a side of the measuring body (10) having the core teeth (17), and a radial gap exists between the tooth tops (17a) of the plurality of core teeth (17) and the measuring ring (2); The measuring body (10) is used to sense the rotation angle signal of the measuring ring (2).

2. The motor rotor measuring device according to claim 1, characterized in that: The magnetic permeability of the measuring ring (2) varies at uniform intervals along the circumferential direction.

3. The motor rotor measuring device according to claim 1, characterized in that: The magnetic permeability of the outer peripheral surface of the measuring ring (2) varies at intervals along the circumferential direction; The plurality of core teeth (17) are sequentially fixedly connected to the inner arc surface of the core yoke (19); The space enclosed by two adjacent core teeth (17) and the inner arc surface of the core yoke (19) forms a core slot (18); The tooth tops (17a) of the plurality of core teeth (17) are opposite to the outer peripheral surface of the measuring ring (2) and have a radial gap.

4. The motor rotor measuring device according to claim 1, characterized in that: The magnetic permeability of the inner circumferential surface of the measuring ring (2) varies at intervals along the circumferential direction; The plurality of core teeth (17) are sequentially fixedly connected to the outer arc surface of the core yoke (19); The space enclosed by two adjacent core teeth (17) and the outer arc surface of the core yoke (19) forms a core slot (18); The tooth tops (17a) of the plurality of core teeth (17) are opposite to the inner circumference of the measuring ring (2) and have a radial gap.

5. The motor rotor measuring device according to claim 1, characterized in that: An AC excitation voltage is applied to the input winding (12), and an AC induced voltage is generated in the output winding; The input winding (12) is wound on at least two core teeth (17) or arranged in at least two core slots (18); When the measuring ring (2) rotates around the rotation axis (25), the amplitude of the AC induced voltage generated by the output winding changes accordingly due to the interval change in the circumferential magnetic permeability of the measuring ring (2).

6. The motor rotor measuring device according to claim 5, characterized in that: When the measuring ring (2) rotates around the rotation axis (25), the amplitude envelope of the AC induced voltage generated by the output winding becomes a periodically changing waveform due to the interval variation of the circumferential magnetic permeability of the measuring ring (2).

7. The motor rotor measuring device according to claim 5, characterized in that: When the measuring ring (2) rotates around the rotation axis (25), the amplitude envelope of the AC induced voltage generated by the output winding is a sine function waveform, a cosine function waveform or a triangular waveform due to the interval change in the circumferential magnetic permeability of the measuring ring (2).

8. The motor rotor measuring device according to claim 5, characterized in that: The output winding comprises two windings, a first output winding (13) and a second output winding (14); The inner circumferential surface or the outer circumferential surface of the measuring ring (2) is evenly formed with a plurality of protrusions (3) along the circumferential direction; The measuring ring (2) rotates around the rotation axis (25), and the plurality of protrusions (3) of the measuring ring (2) successively pass through the tooth tops (17a) of the plurality of iron core teeth (17) of the iron core (16) of the measuring body (10), and the amplitude of the AC induced voltage generated by the first output winding (13) and the second output winding (14) changes accordingly; When the AC excitation voltage is applied to the input winding (12), E_12(t)=E*sin(2*π*f*t); The AC induced voltage generated by the first output winding (13) is: E_13(t)=K*E*sin(Z*θ)*sin(2*π*f*t); The AC induced voltage generated by the second output winding (14) is: E_14(t)=K*E*cos(Z*θ)*sin(2*π*f*t); Wherein, θ is the angle of rotation of the measuring ring (2) around the rotation axis (25), E is a constant, f is the frequency of the AC excitation voltage changing with time t, K is a constant, Z is the number of protrusions of the measuring ring, Z*α=360°, and α is the angle between adjacent protrusions (3).

9. The motor rotor measuring device according to claim 1, characterized in that: An AC excitation voltage is applied to the input winding (12), and an AC induced voltage is generated in the output winding; The input winding (12) is wound on at least two core teeth (17) or arranged in at least two core slots (18); When the measuring ring (2) rotates around the rotation axis (25), the phase angle of the AC induced voltage generated by the output winding changes accordingly due to the interval change in the circumferential magnetic permeability of the measuring ring (2).

10. The motor rotor measuring device according to claim 9, characterized in that: The input winding (12) comprises two windings: a first input winding (32) and a second input winding (33); The output winding comprises two windings, a first output winding (13) and a second output winding (14); The measuring ring (2) rotates around the rotation axis (25), and the multiple protrusions (3) of the measuring ring (2) successively pass through the tooth tops (17a) of the multiple iron core teeth (17) of the iron core (16) of the measuring body (10), and the phase angles of the AC induced voltages generated by the first output winding (13) and the second output winding (14) change accordingly.

11. The motor rotor measuring device according to claim 10, characterized in that: The inner circumferential surface or the outer circumferential surface of the measuring ring (2) is evenly formed with a plurality of protrusions (3) along the circumferential direction; When the AC excitation voltage applied to the first input winding (32) is: E_32(t)=E*sin(2*π*f*t); and the AC excitation voltage applied to the second input winding (33) is: E_33(t)=E*cos(2*π*f*t); Then the AC induced voltage generated by the first output winding (13) is: E_13(t)=K*E*sin(2*π*f*t-β); The AC induced voltage generated by the second output winding (14) is: E_14(t)=K*E*cos(2*π*f*t-β); β=Z*θ; Among them, β is the phase angle of the AC induced voltage generated by the output winding, Z is the number of protrusions of the measuring ring, θ is the angle of rotation around the rotation axis, f is the frequency of the AC excitation voltage changing with time t, E is a constant, and K is a constant.

12. The motor rotor measuring device according to claim 8 or 11, characterized in that: The raised portion (3) of the measuring ring (2) is made of a material with a relative magnetic permeability greater than 10.

13. The motor rotor measuring device according to claim 8 or 11, characterized in that: The surface shape of the raised portion (3) is arched.

14. The motor rotor measuring device according to claim 1, characterized in that: The minimum value of the radial clearance between the tooth top (17a) of the core tooth (17) of the measuring body (10) and the measuring ring (2) is 0.1 mm to 5 mm.

15. The motor rotor measuring device according to claim 1, characterized in that: The minimum radial clearance between the tooth top (17a) of the core tooth (17) of the measuring body (10) and the measuring ring (2) is 0.4 mm to 1.5 mm.

16. The motor rotor measuring device according to claim 1, characterized in that: A plurality of core teeth (17) are sequentially and evenly fixedly connected to the same arc surface of the core yoke (19).

17. The motor rotor measuring device according to claim 1, characterized in that: The measuring ring (2) is entirely made of a material with a relative magnetic permeability greater than 10.

18. The motor rotor measuring device according to claim 1, characterized in that: The measuring ring (2) is entirely formed by stacking silicon steel sheets.

19. The motor rotor measuring device according to claim 1, characterized in that: The winding (11) is made of enameled wire.

20. The motor rotor measuring device according to claim 1, characterized in that: The iron core (16) of the measuring body (10) is made of a material with a relative magnetic permeability greater than 10.

21. The motor rotor measuring device according to claim 1, characterized in that: The iron core (16) of the measuring body (10) is formed by stacking silicon steel sheets.

22. The motor rotor measuring device according to claim 1, characterized in that: Each winding is wound on the core teeth (17) in a concentrated winding form, or is arranged in the core slots (18) in a distributed embedded form.

23. An elevator car driving device comprising the motor rotor measuring device according to any one of claims 1 to 22, characterized in that: The elevator car drive device also includes an elevator traction motor; The rotating part of the elevator traction motor (21) includes a rope pulley (26); The rope wheel (26) is rotatably mounted on the main body (30) of the elevator traction motor via a bearing (29) and is used to drive the elevator rope; The measuring body (10) is fixedly assembled with the main body (30) of the elevator traction motor (21); The measuring ring (2) is assembled with the rotating part of the elevator traction motor (21).

24. The elevator car driving device according to claim 23, characterized in that: The rotor (22) of the elevator traction motor is provided with a mounting surface (24); The measuring ring (2) is assembled on the mounting surface (24) of the rotor through its inner peripheral surface (4), thereby being assembled together with the rotating part of the elevator traction motor.

25. The elevator car driving device according to claim 23, characterized in that: The elevator traction motor (21) is a permanent magnet synchronous motor in which a permanent magnet is mounted on a rotor (22).

26. The elevator car driving device according to claim 23, characterized in that: The stator (27) and the rotor (22) of the elevator traction motor (21) are arranged opposite to each other, and a disc-shaped air gap surface perpendicular to the rotation axis (25) is formed between the rotor (22) and the stator (27), or a cylindrical air gap surface with the rotation axis (25) as the axis is formed between the rotor (22) and the stator (27) of the elevator traction motor (21).

27. The elevator car driving device according to claim 23, characterized in that: The elevator traction motor is equipped with a sheave guard plate (23); The sheave guard plate (23) is fixed to a main body (30) of an elevator traction motor (21) and extends to the front side of the sheave (26); the sheave (26) is accommodated between the main body (30) and the sheave guard plate (23); The measuring body (10) is assembled and fixed on the rope wheel guard plate (23).

28. The elevator car driving device according to claim 27, characterized in that: The measuring body (10) and the rope wheel guard plate (23) are assembled together via a connecting piece (9).

29. The elevator car driving device according to claim 27, characterized in that: The core yoke (19) and the sheave guard plate (23) of the measuring body (10) are connected via a connecting piece (9), and the measuring body (10) is assembled on the main body (30) of the elevator traction motor (21).

30. The elevator car driving device according to claim 27, characterized in that: The rope wheel guard plate (23) has an opening corresponding to the measuring body (10).

31. The elevator car driving device according to claim 27, characterized in that: There is at least one fixed connection point between the sheave guard (23) and the main body (30).

32. The elevator car driving device according to claim 31, characterized in that: The connection point between the sheave guard plate (23) and the main body (30) is arranged at a lower position and / or a middle position of the main body (30).

33. The elevator car driving device according to claim 27, characterized in that: The rope wheel guard plate (23) is a structure formed by bending a sheet metal part.

34. The elevator car driving device according to claim 23, characterized in that: The iron core yoke (19) of the measuring body (10) and the main body (30) of the elevator traction motor are assembled together through a connecting piece (9), and the measuring body (10) is assembled on the main body (30) of the elevator traction motor.

35. The elevator car driving device according to claim 34, characterized in that: The main body part (30) has an opening corresponding to the measuring body (10).

Images