Motor stator knot coil structure

Abstract

The utility model discloses a motor stator knot wire coil structure, which is installed on a plurality of motor stators, coils are wound on the plurality of motor stators, each coil is provided with a driving end and a neutral end, the motor stator knot wire coil structure comprises a terminal seat which is provided with a plurality of fixed convex parts, a plurality of wire separating grooves and a plurality of locking parts; the at least one neutral terminal sheet is arranged on the terminal seat and is provided with a plurality of positioning holes, a plurality of neutral line connecting parts and at least one neutral line terminal, the plurality of positioning holes are correspondingly combined with the plurality of fixed convex parts, the plurality of neutral line connecting parts correspond to part of the plurality of line separating grooves and are electrically connected with the neutral end, and the neutral line terminal is the neutral end; and the three-phase terminal sheet is stacked above the neutral terminal sheet and is provided with a plurality of first locking holes and a plurality of driving wire connecting parts, the plurality of first locking holes are correspondingly combined with the locking parts, and the plurality of driving wire connecting parts correspond to part of the plurality of wire separating grooves and are electrically connected with any driving end.

Description

Technical Field

[0001] The utility model relates to a motor stator wiring disc structure, in particular to a structure which utilizes the motor stator wiring disc to lead out three-phase coil terminals to estimate the magnet temperature of a permanent magnet motor in operation. Background Art

[0002] When the permanent magnet motor is running, the coil will heat up due to copper loss, the stator silicon steel sheet will heat up due to iron loss, the rotor silicon steel sheet will heat up due to iron loss, and the magnet itself will heat up due to surface eddy current loss. As the temperature rises, the performance of the motor will decline, and even the high-temperature magnet will be permanently demagnetized, causing irreversible performance degradation of the motor. Therefore, monitoring the magnet temperature is an urgent problem that motor designers need to solve.

[0003] Temperature acquisition can be divided into direct measurement or indirect measurement. However, because the magnet in the brushless permanent magnet motor is a rotating part, the direct measurement method can be divided into contact and non-contact. The contact method can directly attach the thermocouple to the magnet, and then transmit the data numerically through wireless transmission. The disadvantages are that it requires a complex wireless transmission mechanism, including circuit boards, transmission ICs, etc., magnetic circuit losses caused by additional thickness, and the cost may increase sharply due to the large number of monitored magnets.

[0004] Non-contact methods such as using infrared instruments to detect radiation for measurement can use infrared instruments to sense the surface temperature of the magnetic steel and convert the temperature into a signal output; the disadvantages are large temperature errors, difficulty in monitoring each pole of the magnet, and easy obstruction of the measurement position by mechanical components.

[0005] Indirect measurement methods, such as measuring the change in the voltage of the stator coil, can estimate the temperature of the magnet through an algorithm. However, this method requires measuring the phase voltage at the neutral point of the motor and then converting the signal into an instant temperature value through an algorithm. Currently, the neutral point of all motors is not brought out as a contact point, so it is impossible to measure the phase voltage. Utility Model Content

[0006] In order to solve the above shortcomings, the purpose of the utility model is to provide a motor stator wiring disk structure, which leads the neutral point on the motor to measure the phase voltage of the motor neutral point. The instantaneous temperature value of the motor magnet can be obtained through algorithm conversion, and necessary treatment can be performed before the magnet enters high-temperature demagnetization, such as reducing the output power or stopping, so as to avoid demagnetization of the magnet and cause permanent degradation of motor performance.

[0007] The utility model provides a motor stator wiring tray structure, which is installed on a plurality of motor stators and is used to lead out the neutral point of the motor coil. A coil is wound on the plurality of motor stators, and each of the plurality of sets of the coils has a driving end and a neutral end. The structure includes a terminal seat, a neutral terminal piece, a three-phase terminal piece and an insulating piece; the terminal seat is provided with a plurality of fixing protrusions, a plurality of wire spacing grooves and a plurality of locking parts; the neutral terminal piece is installed on the terminal seat, and the neutral terminal piece is provided with a plurality of positioning holes, a plurality of A neutral line connection part and at least one neutral line terminal, a plurality of positioning holes correspondingly combined with a plurality of fixing protrusions, a plurality of neutral line connection parts corresponding to part of the wire partition groove, electrically connected to the neutral end of the motor coil, and the neutral line terminal is the neutral end; a three-phase terminal piece is stacked above the neutral terminal, and is provided with a plurality of first locking holes and a plurality of drive line connection parts, a plurality of first locking holes correspondingly combined with the locking part, a plurality of drive line connection parts corresponding to part of the wire partition groove, electrically connected to any one of the drive ends.

[0008] The utility model provides the above-mentioned motor stator wiring disk structure, further comprising a plurality of insulating sheets, which are provided with a plurality of second locking holes corresponding to a plurality of first locking holes, and are stacked under each three-phase terminal sheet to insulate the neutral terminal sheet and the three-phase terminal sheet from each other.

[0009] The terminal seat, the three-phase terminal piece and the plurality of insulating pieces are all in a closed ring shape.

[0010] The terminal seat is made of an insulator material in one piece.

[0011] The neutral end and the plurality of driving ends respectively pass through any one of the wire separation grooves and are connected to the neutral terminal piece or the three-phase terminal piece.

[0012] The neutral terminal piece is in a closed ring shape, and a neutral line terminal is arranged thereon, which is electrically connected to the plurality of neutral line connecting parts and extends upward from the inner side of the ring to form a neutral end.

[0013] There are a plurality of neutral terminal pieces, which are distributed in a ring shape. One of the neutral terminal pieces is provided with a neutral line terminal, which is electrically connected to the plurality of neutral line connecting parts and extends upward from the inner side of the ring to form the neutral end.

[0014] The plurality of neutral line connection parts are bent upward and extended from the outer side of the ring, and the ends thereof are also bent horizontally outward to form an inverted L shape.

[0015] The uppermost driving line connection portion is formed by horizontally extending outward from the outer side of the ring.

[0016] The three-phase terminal piece is also provided with a phase terminal connection portion, which is bent upward and extended from the inner side of the ring, and the end portion is bent into a U-shape opening inward. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the circuit structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the motor stator and the wiring reel structure after being combined;

[0019] Figure 3 It is a schematic diagram of the wiring reel structure;

[0020] Figure 4 This is a schematic diagram of the motor appearance after the combined wiring reel;

[0021] Figure 5-1 This is a schematic diagram of the exploded structure of the cable tie tray according to the first embodiment of the present utility model;

[0022] Figure 5-2 is a schematic diagram of an equivalent circuit of the first embodiment;

[0023] Figure 5-3 A schematic diagram of the wiring tray structure assembly of the first embodiment;

[0024] Figure 5-4 It is a schematic diagram of the neutral terminal piece of the first embodiment;

[0025] Figure 6-1 This is a schematic diagram of the exploded structure of the cable tie tray according to the second embodiment of the present utility model;

[0026] Figure 6-2 is a schematic diagram of an equivalent circuit of the second embodiment;

[0027] Figure 6-3 A schematic diagram of the wiring tray structure assembly of the second embodiment;

[0028] Figure 6-4 Schematic diagram of the neutral terminal piece of the second embodiment.

[0029] Explanation of the reference numerals: 100 - measuring device; Va, Vb, Vc - three-phase driving end; n - measuring end; n' - neutral end; 10 - junction tray; 11 - terminal seat; 111 - fixing protrusion; 112 - wire spacing groove; 113 - locking part; 12 - neutral terminal piece; 121 - positioning hole; 122 - neutral line connection part; 123 - neutral line terminal; 13 - three-phase terminal; 13a, 13b, 13c - three-phase terminal piece; 131 - first locking hole; 132 - driving line connection part; 133 - phase terminal connection part; 14 - insulating sheet; 141 - second locking hole; 20 - motor stator. DETAILED DESCRIPTION

[0030] The utility model mainly utilizes a wire coil structure to lead out the neutral end of the three-phase coil. By measuring the phase voltage at the neutral end of the motor, the instantaneous temperature value can be calculated by an algorithm to achieve the purpose of estimating the motor magnet temperature. Therefore, please refer to Figures 1 to 4 As shown, Figure 1 It is a schematic diagram of the circuit structure of the utility model.

[0031] First, the principle of the present invention is explained. In the present invention, the three-phase driving ends Va, Vb, and Vc of the three-phase coils La, Lb, and Lc of the motor are electrically connected to the three-phase resistor Rn respectively. Each phase coil La, Lb, and Lc is composed of a plurality of coil groups, and one end of the plurality of coil groups is electrically connected to form the driving end Va, Vb, and Vc, and the other end of the three-phase resistor Rn is electrically connected to form a measuring point n.

[0032] The other end of the three-phase coils La, Lb, and Lc is a neutral end. The multiple neutral ends are led out through a wiring tray structure (as described later) and then electrically connected to form a neutral point n', or any group of the neutral ends or part of the neutral ends of the first, second, and third phase coils are electrically connected in parallel to form multiple neutral points n'1, n'2... (as described later). At this time, a phase voltage measuring device 100 can be used to measure the phase voltage Vnp between the measuring point n and the neutral point n', that is, the voltage difference between n and n'.

[0033] Since the temperature of the motor magnet will change continuously during operation, and the measured phase voltage Vnp will be different at different temperatures, the utility model first calibrates the relationship between the motor magnet temperature and the phase voltage, and then estimates the magnet temperature. The calibration method is to first control the magnet at a certain temperature T1, drive the motor at a certain speed S1, and perform a short-term Fourier Transform (STFT) on the measured Vnp voltage waveform to obtain the harmonic parameter K T value, because the harmonic parameter K T The value is linearly related to the speed, so it is only necessary to test any speed.

[0034] Assume that the first temperature T1 corresponds to the first harmonic parameter K T1 The second temperature T2 corresponds to the second harmonic parameter K T2 By analogy, any temperature Tn to be estimated will also correspond to a third harmonic number K Tn Therefore, the utility model only needs to first measure the harmonic parameter K corresponding to the two different temperatures T1 and T2 of the motor magnet. T1 Value and K T2 When the current magnet temperature Tn needs to be estimated, the magnet temperature Tn can be estimated by the following calculation formula:

[0035] The estimated temperature Tn is equal to the first temperature T1 plus the temperature change ΔT, and the formula is Tn=T1+ΔT;

[0036] Calculate the temperature change ΔT = (T2-T1)*(K Tn -K T1 ) / (K T2 –K T1 );

[0037] Combine the above formulas to estimate the temperature Tn = T1 + ((T2-T1)*(K Tn -K T1 ) / (K T2 -K T1 )).

[0038] Of course, the utility model can also build a table of phase voltages of all magnet temperatures in advance, and use the table lookup method to obtain the estimated temperature. For example, drive the motor to run at temperature T1, and measure the V between the measurement point and the neutral point. NP1 Voltage waveform, then V NP1 The voltage waveform is subjected to short-term Fourier transform (STFT) to obtain K T1 Harmonic parameters; then drive the motor to run at temperature T2 and measure V NP2 Voltage waveform, after short-term Fourier transform (STFT) to get K T2 Harmonic parameters; therefore, the T1 temperature corresponds to K T1 Harmonic parameters, T2 temperature corresponds to K T2 Harmonic parameters, and so on, Tn temperature corresponds to K Tn The harmonic parameters can be found by looking up the table.

[0039] Please also refer to Figures 1 to 4 As shown, Figure 2 It is a schematic diagram of the motor stator and the wiring reel structure after being combined; Figure 3 It is a schematic diagram of the wiring reel structure; Figure 4 Schematic diagram of the motor appearance after the assembly of the wiring tray; The wiring tray 10 structure of the utility model is installed on a plurality of motor stators 20, and the plurality of motor stators 20 are all wound with coils (not shown in the figure), and the plurality of coils each have three-phase driving terminals Va, Vb, Vc and a neutral terminal n'. The wiring tray 10 structure includes a terminal seat 11, at least one neutral terminal piece 12 and three-phase terminals 13 (Va, Vb, Vc).

[0040] Please also read Figure 5-1 to Figure 5-4 The first embodiment of the present utility model is shown in which Figure 5-1 It is a schematic diagram of the exploded structure of the cable tray of the first embodiment; Figure 5-2 is a schematic diagram of an equivalent circuit of the first embodiment; Figure 5-3A schematic diagram of the wiring tray structure assembly of the first embodiment; and Figure 5-4 Schematic diagram of the neutral terminal piece of the first embodiment. In the first embodiment of the utility model, the terminal seat 11 is provided with a plurality of fixing protrusions 111, a plurality of wire separation grooves 112 and a plurality of locking portions 113, wherein the fixing protrusions 111 are used to position the neutral terminal piece 12, and the wire separation grooves 112 are used to guide the coil on the motor stator 20 into the wire separation grooves 112, and extend upward to connect with the phase terminal piece (not shown in the figure). Preferably, the terminal seat 11 is made of an insulator material in one piece.

[0041] The neutral terminal piece 12 is mounted on the terminal seat 11, and is provided with a plurality of positioning holes 121, a plurality of neutral line connecting parts 122 and a neutral line terminal 123, wherein the plurality of positioning holes 121 correspond to the plurality of fixed protrusions 111 combined on the terminal seat 11, and the plurality of neutral line connecting parts 122 correspond to a portion of the plurality of wire separation grooves 112, and are electrically connected to the neutral end of the coil. The center line terminal 123 is the neutral end n'. Preferably, the neutral end n' of the coil and the plurality of driving ends Va, Vb, Vc respectively pass through any of the wire separation grooves 112, and are connected to the neutral terminal piece 12 or the three-phase terminal piece.

[0042] The three-phase terminal piece is stacked on the neutral terminal piece 12. As shown in the figure, the three-phase terminal piece is divided into an A-phase terminal piece 13a, a B-phase terminal piece 13b and a C-phase terminal piece 13c. An insulating piece 14 is stacked under each three-phase terminal piece to insulate the neutral terminal piece and the plurality of three-phase terminal pieces from each other. Preferably, the terminal seat 11, the neutral terminal piece 12, the three-phase terminal piece and the insulating piece 14 are all in a closed ring shape.

[0043] The three-phase terminal pieces 13a, 13b, 13c are provided with a plurality of first locking holes 131 and a plurality of driving line connecting parts 132. The plurality of insulating pieces 14 are provided with a plurality of second locking holes 141. The plurality of first locking holes 131 correspond to each other. The plurality of second locking holes 141 are combined with the locking part 113 on the terminal seat 11. The plurality of driving line connecting parts 132 correspond to a portion of the plurality of wire separation grooves 112 and are electrically connected to the driving end Va, Vb, Vc of any coil. Figure 5-2 As shown in the equivalent circuit of this embodiment, the neutral ends n′ of all coils are electrically connected together through a neutral terminal piece 12 , and then extend out of the motor through a neutral line terminal 123 to connect to the measuring device 100 .

[0044] Please also read Figure 6-1 to Figure 6-4 As shown, it is the second embodiment of the utility model, wherein Figure 6-1 This is a schematic diagram of the exploded structure of the cable tie tray according to the second embodiment of the present utility model; Figure 6-2is a schematic diagram of an equivalent circuit of the second embodiment; Figure 6-3 A schematic diagram of the wiring tray structure assembly of the second embodiment; Figure 6-4 Schematic diagram of the neutral terminal piece of the second embodiment. The second embodiment of the utility model also has a terminal seat 11, a neutral terminal piece 12 and a three-phase terminal piece 13. The difference from the first embodiment is as follows: Figure 6-3 and Figure 6-4 As shown, the neutral terminal pieces 12 have a plurality of them, which are distributed in a ring shape, wherein one neutral terminal piece 12 is provided with a neutral line terminal 123, and the plurality of neutral terminal pieces 12 are respectively electrically connected to the neutral line connecting parts 122 of some coils to form n'1~n'4, and the neutral line terminal 123 extends upward from the inner side of the ring shape of the neutral terminal piece 12 to form the neutral end n'1.

[0045] Preferably, in the embodiment of the present utility model, as Figure 5-4 and Figure 6-4 As shown, the neutral line connecting portion 122 is bent upward from the outer side of the ring and extends, and its end is further bent horizontally outward to form an inverted L shape. Figure 5-1 and Figure 6-1 As shown, the driving line connection part 132 is also bent upward from the outer side of the ring, and its end is further bent outward horizontally to form an inverted L shape, and the driving line connection part 132 of the uppermost A-phase terminal piece 13a is formed by extending horizontally from the outer side of the ring. A phase terminal connection part 133 is further provided on the plurality of three-phase terminal pieces, which is bent upward from the inner side of the ring, and its end is further bent into a U-shape opening inward, forming three-phase driving terminals Va, Vb, and Vc.

[0046] In summary, the first embodiment and the second embodiment of the present invention can both utilize a junction plate structure to lead out the neutral end n' of the three-phase coil of the motor, and connect three driving ends in parallel with resistors to form a measuring point n. By using the phase voltage between the measuring point n and the neutral end n', an algorithm can be used to calculate the instantaneous temperature value, thereby achieving the purpose of estimating the motor magnet temperature.

Claims

1. A motor stator winding plate structure, installed on a plurality of motor stators, a coil is wound on the plurality of motor stators, and each of the plurality of sets of coils has a driving end and a neutral end, characterized in that: The structure includes: A terminal block having a plurality of fixing protrusions, a plurality of wire separation grooves and a plurality of locking portions; At least one neutral terminal piece is installed on the terminal seat, and is provided with a plurality of positioning holes, a plurality of neutral line connecting parts and at least one neutral line terminal. The plurality of positioning holes are correspondingly combined with the plurality of fixing protrusions, the plurality of neutral line connecting parts correspond to parts of the plurality of wire spacing grooves, and are electrically connected to the neutral end. The neutral line terminal is the neutral end; and The three-phase terminal piece is stacked on top of the neutral terminal piece and is provided with a plurality of first locking holes and a plurality of drive line connecting parts. The plurality of first locking holes are mutually correspondingly combined with the locking parts, and the plurality of drive line connecting parts correspond to parts of the plurality of wire spacing grooves and are electrically connected to any one of the drive ends.

2. The motor stator wiring tray structure according to claim 1, characterized in that: Also includes: A plurality of insulating sheets are provided with a plurality of second locking holes corresponding to the plurality of first locking holes and are stacked under each of the three-phase terminal sheets so that the neutral terminal sheet and the three-phase terminal sheets are insulated from each other.

3. The motor stator wiring tray structure according to claim 2, characterized in that: The terminal seat, the three-phase terminal piece and the plurality of insulating pieces are all in a closed ring shape.

4. The motor stator wiring tray structure according to claim 1, characterized in that: The terminal seat is made of an insulator material in one piece.

5. The motor stator wiring tray structure according to claim 1, characterized in that: The neutral end and the plurality of driving ends respectively pass through any one of the wire separation grooves and are connected to the neutral terminal piece or the three-phase terminal piece.

6. The motor stator wiring tray structure according to claim 3, characterized in that: The neutral terminal piece is in a closed ring shape, and a neutral line terminal is arranged thereon, which is electrically connected to the plurality of neutral line connecting parts and extends upward from the inner side of the ring shape to form a neutral end.

7. The motor stator wiring tray structure according to claim 3, characterized in that: The neutral terminal pieces are provided in plurality and distributed in a ring shape, wherein one of the neutral terminal pieces is provided with a neutral line terminal, which is electrically connected to the plurality of neutral line connecting parts and extends upward from the inner side of the ring shape to form the neutral end.

8. The motor stator wiring tray structure according to claim 6, characterized in that: The plurality of neutral line connecting parts are bent upward and extended from the outer side of the ring, and the ends thereof are also bent horizontally outward to form an inverted L shape.

9. The motor stator wiring tray structure according to claim 7, characterized in that: The plurality of neutral line connecting parts are bent upward and extended from the outer side of the ring, and the ends thereof are also bent horizontally outward to form an inverted L shape.

10. The motor stator wiring tray structure according to claim 3, characterized in that: The plurality of driving line connection parts are bent upward and extended from the outer side of the ring, and the ends thereof are also bent horizontally outward to form an inverted L shape.

11. The motor stator wiring tray structure according to claim 9, characterized in that: The uppermost driving line connection portion is formed by horizontally extending outward from the outer side of the ring.

12. The motor stator wiring tray structure according to claim 3, characterized in that: The three-phase terminal piece is also provided with a phase terminal connecting portion, which is bent upward and extended from the inner side of the ring, and the end portion of the phase terminal connecting portion is bent into a U-shape opening inward.

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