CN212781769U - Motor controller and sine and cosine fault diagnosis circuit of rotary transformer of motor controller - Google Patents
Motor controller and sine and cosine fault diagnosis circuit of rotary transformer of motor controller Download PDFInfo
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- CN212781769U CN212781769U CN202021854735.8U CN202021854735U CN212781769U CN 212781769 U CN212781769 U CN 212781769U CN 202021854735 U CN202021854735 U CN 202021854735U CN 212781769 U CN212781769 U CN 212781769U
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Abstract
The application discloses machine controller and resolver's sine and cosine fault diagnosis circuit thereof, the concrete circuit structure of this circuit includes: the seventh resistor, the fifth resistor and the fourth resistor are sequentially connected in series between the direct current power supply and the ground wire; one end of the third resistor is connected with the positive output end of the rotary transformer, and the other end of the third resistor is connected with the common end of the fourth resistor and the fifth resistor; one end of the sixth resistor is connected to the negative output end of the rotary transformer, and the other end of the sixth resistor is connected to the common end of the fifth resistor and the seventh resistor; the MCU is connected with the positive output end of the rotary transformer through the first resistor and connected with the negative output end of the rotary transformer through the second resistor, and is used for outputting a corresponding diagnosis result according to the sine and cosine positive diagnosis signal output by the first resistor and the sine and cosine negative diagnosis signal output by the second resistor. The method and the device can accurately and effectively realize sine and cosine fault diagnosis of the rotary transformer at low cost, and further effectively improve the economic benefit of products.
Description
Technical Field
The application relates to the technical field of motor control, in particular to a motor controller and a sine and cosine fault diagnosis circuit of a rotary transformer of the motor controller.
Background
The rotary transformer is mainly used in the field of motor control with high environmental condition requirements, is used for decoding the angular position and the angular speed of a motor rotor, is input by an excitation signal, and is decoded by a sine-cosine circuit. At present, a diagnosis circuit for decoding the rotary transformer is mainly processed by using a special decoding chip, sine and cosine fault diagnosis is directly processed by the decoding chip, but the decoding chip has higher cost. Some of the decoding methods use soft decoding technology, although the cost is low, the accuracy rate is low in the prior art, and effective diagnosis cannot be achieved. In view of the above, it is an important need for those skilled in the art to provide a solution to the above technical problems.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a motor controller and a sine and cosine fault diagnosis circuit of a rotary transformer thereof, so that sine and cosine fault diagnosis of the rotary transformer can be accurately and effectively realized at low cost.
In order to solve the technical problem, in a first aspect, the application discloses a sine and cosine fault diagnosis circuit of a rotary transformer, which comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an MCU;
the seventh resistor, the fifth resistor and the fourth resistor are sequentially connected in series and then connected between a direct current power supply and a ground wire, wherein the fourth resistor is grounded; one end of the third resistor is connected to the positive output end of the rotary transformer, and the other end of the third resistor is connected to the common end of the fourth resistor and the fifth resistor; one end of the sixth resistor is connected to the negative output end of the rotary transformer, and the other end of the sixth resistor is connected to the common end of the fifth resistor and the seventh resistor;
the MCU is connected with the positive output end of the rotary transformer through the first resistor and connected with the negative output end of the rotary transformer through the second resistor, and is used for outputting a corresponding diagnosis result according to the sine and cosine positive diagnosis signal output by the first resistor and the sine and cosine negative diagnosis signal output by the second resistor.
Optionally, the method further comprises:
the first blocking capacitor is connected with the positive output end of the rotary transformer and is used for outputting a sine and cosine positive decoding signal after blocking processing;
and the second blocking capacitor is connected with the negative output end of the rotary transformer and is used for outputting the positive cosine and negative decoding signals after blocking treatment.
Optionally, the first resistor and the second resistor have equal resistance values.
Optionally, the third resistor and the sixth resistor have the same resistance; the seventh resistor, the fifth resistor and the fourth resistor are equal in resistance value.
Optionally, the resistances of the third resistor and the sixth resistor are greater than the resistances of the seventh resistor, the fifth resistor and the fourth resistor by an order of magnitude.
Optionally, the resistance values of the third resistor and the sixth resistor are both 100k Ω; the seventh resistor, the fifth resistor and the fourth resistor are all 10k omega in resistance.
In a second aspect, the present application further discloses a motor controller including a resolver and any one of the sine and cosine fault diagnosis circuits described above.
The sine and cosine fault diagnosis circuit of the rotary transformer comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an MCU; the seventh resistor, the fifth resistor and the fourth resistor are sequentially connected in series and then connected between a direct current power supply and a ground wire, wherein the fourth resistor is grounded; one end of the third resistor is connected to the positive output end of the rotary transformer, and the other end of the third resistor is connected to the common end of the fourth resistor and the fifth resistor; one end of the sixth resistor is connected to the negative output end of the rotary transformer, and the other end of the sixth resistor is connected to the common end of the fifth resistor and the seventh resistor; the MCU is connected with the positive output end of the rotary transformer through the first resistor and connected with the negative output end of the rotary transformer through the second resistor, and is used for outputting a corresponding diagnosis result according to the sine and cosine positive diagnosis signal output by the first resistor and the sine and cosine negative diagnosis signal output by the second resistor.
The motor controller and the sine and cosine fault diagnosis circuit of the rotary transformer thereof have the advantages that: the sine and cosine fault diagnosis circuit for the rotary transformer is constructed by skillfully connecting the resistance voltage division network with the secondary output circuit of the rotary transformer, which has simple result and low cost, so that different sampling voltage conditions can be obtained when different fault problems occur to the rotary transformer, therefore, the sine and cosine fault diagnosis for the rotary transformer can be accurately and effectively realized at low cost, and the economic benefit of products is greatly improved.
Drawings
In order to more clearly illustrate the technical solutions in the prior art and the embodiments of the present application, the drawings that are needed to be used in the description of the prior art and the embodiments of the present application will be briefly described below. Of course, the following description of the drawings related to the embodiments of the present application is only a part of the embodiments of the present application, and it will be obvious to those skilled in the art that other drawings can be obtained from the provided drawings without any creative effort, and the obtained other drawings also belong to the protection scope of the present application.
Fig. 1 is a schematic circuit diagram of a sine and cosine fault diagnosis circuit of a resolver according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit diagram of a sine-cosine fault diagnosis circuit of another resolver disclosed in an embodiment of the present application.
Detailed Description
The core of the application lies in providing a motor controller and a sine and cosine fault diagnosis circuit of a rotary transformer thereof, so as to accurately and effectively realize sine and cosine fault diagnosis of the rotary transformer at low cost.
In order to more clearly and completely describe the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The rotary transformer is mainly used in the field of motor control with high environmental condition requirements, is used for decoding the angular position and the angular speed of a motor rotor, is input by an excitation signal, and is decoded by a sine-cosine circuit. At present, a diagnosis circuit for decoding the rotary transformer is mainly processed by using a special decoding chip, sine and cosine fault diagnosis is directly processed by the decoding chip, but the decoding chip has higher cost. Some of the decoding methods use soft decoding technology, although the cost is low, the accuracy rate is low in the prior art, and effective diagnosis cannot be achieved. In view of this, the present application provides a sine and cosine fault diagnosis scheme for a resolver, which can effectively solve the above problems.
Referring to fig. 1, the embodiment of the application discloses a sine and cosine fault diagnosis circuit of a rotary transformer TR, which mainly includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an MCU;
the seventh resistor R7, the fifth resistor R5 and the fourth resistor R4 are sequentially connected in series and then connected between the direct-current power supply and the ground wire, wherein the fourth resistor R4 is grounded; one end of the third resistor R3 is connected to the positive output end of the rotary transformer TR, and the other end is connected to the common end of the fourth resistor R4 and the fifth resistor R5; one end of the sixth resistor R6 is connected to the negative output end of the rotary transformer TR, and the other end is connected to the common end of the fifth resistor R5 and the seventh resistor R7;
the MCU is connected with the positive output end of the rotary transformer TR through the first resistor R1 and connected with the negative output end of the rotary transformer TR through the second resistor R2, and is used for outputting a corresponding diagnosis result according to a sine and cosine positive diagnosis signal MCU _ A + output by the first resistor R1 and a sine and cosine negative diagnosis signal MCU _ A-output by the second resistor R2.
Specifically, under the normal working condition of the rotary transformer TR, two output ends (a positive output end and a negative output end) of the secondary winding of the rotary transformer TR output a pair of differential signals (i.e. a sine and cosine positive signal a + and a sine and cosine negative signal a-); specifically, the differential signal may be a pair of sine differential signals (in this case, A + is an SIN + signal, and A-is an SIN-signal), or a pair of cosine differential signals (in this case, A + is a COS + signal, and A-is a COS-signal). The sine and cosine fault diagnosis circuit disclosed by the application is used for carrying out fault diagnosis on the pair of sine and cosine differential signals output by the rotary transformer TR.
The seventh resistor R7, the fifth resistor R5, and the fourth resistor R4 are voltage dividing resistors, and after the three resistors are connected in series, the voltage dividing resistors divide a power supply voltage VCC provided by a direct current power supply to form a resistor voltage dividing network. Generally, a power supply voltage VCC used in a circuit is 5V. The first resistor R1 and the second resistor R2 are sampling resistors, wherein the first resistor R1 is connected to the positive output terminal of the rotary transformer TR and may be referred to as a positive signal fault diagnosis sampling resistor, and the second resistor R2 is connected to the negative output terminal of the rotary transformer TR and may be referred to as a negative signal fault diagnosis sampling resistor.
The sampling point of the first resistor R1, i.e. the positive output terminal of the rotary transformer TR, is further connected to the resistor voltage dividing network through the third resistor R3, specifically connected between the fourth resistor R4 and the fifth resistor R5. A sampling point of the second resistor R2, namely, a negative output terminal of the rotary transformer TR, is further connected to the resistor voltage dividing network through the sixth resistor R6, specifically connected between the fifth resistor R5 and the seventh resistor R7.
Therefore, when the output path of the sine and cosine signal of the rotary transformer TR is failed, the sampling voltage at the sampling point is changed, and thus, the circuit structure of the diagnostic circuit disclosed by the application determines that the MCU can obtain a corresponding fault diagnosis result based on the signal condition output by the two sampling resistors, thereby implementing soft diagnosis of the sine and cosine fault of the rotary transformer TR.
By combining the circuit structure of the diagnostic circuit provided by the application, through analysis, when the circuit of the rotary transformer TR has no fault, a pair of sine and cosine differential signals are normally output. Because the sine and cosine differential signals are alternating current signals, the direct current impedance of a secondary side circuit of the rotary transformer TR is almost zero, and when direct current analysis is carried out, points connected with two output ends of the rotary transformer TR are equivalently short-circuited for a resistance voltage division network, namely, a first resistor R1 and a second resistor R2 are equivalently sampling the same point, and the obtained sampling voltages are the same in size. That is, when the line is normal and has no fault, the magnitude of the sine and cosine positive diagnostic signal MCU _ a + output by the first resistor R1 is equal to the magnitude of the sine and cosine negative diagnostic signal MCU _ a-output by the second resistor R2.
When the output line of the rotary transformer TR has an open circuit fault, specifically, the output line may be a sine and cosine positive signal a + open circuit or a sine and cosine negative signal a-open circuit or both open circuits, and at this time, the dc impedance of the secondary side circuit of the rotary transformer TR is infinite, which is equivalent to an open circuit, and does not have a voltage influence on the resistance voltage dividing network. At this time, the voltage value sampled by the first resistor R1 is the voltage across the fourth resistor R4, and the voltage value sampled by the second resistor R2 is the sum of the voltages across the fourth resistor R4 and the fifth resistor R5. Obviously, at this time, the sampled voltage of the first resistor R1 is less than the sampled voltage of the second resistor R2, i.e., MCU _ a + is less than MCU _ a-.
When the sine and cosine positive signal A + of the rotary transformer TR is short-circuited to a power supply, the sampling voltage of the first resistor R1, namely the sine and cosine positive diagnosis signal MCU _ A + is the power supply voltage VCC; similarly, when the sine-cosine negative signal A-of the rotary transformer TR is short-circuited to the power supply, the sampled voltage of the second resistor R2, i.e., the sine-cosine negative diagnostic signal MCU _ A-is the power supply voltage VCC at this time.
When the sine and cosine positive signal A + of the rotary transformer TR is short-circuited to the ground wire, the sampling voltage of the first resistor R1, namely the sine and cosine positive diagnosis signal MCU _ A + is 0V at the moment; similarly, when the sine-cosine negative signal A-of the rotary transformer TR is shorted to the ground, the sampled voltage of the second resistor R2, i.e., the sine-cosine negative diagnostic signal MCU _ A-is 0V at this time.
Therefore, based on the sine and cosine fault diagnosis circuit provided by the application, when different fault problems occur in the rotary transformer TR circuit, sine and cosine positive and negative diagnosis signals with different sizes are obtained, and therefore the fault problems can be identified and detected.
From the above, the sampling results for different failure cases are shown in table 1.
TABLE 1
The sine and cosine fault diagnosis circuit of the rotary transformer TR provided by the embodiment of the application comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and an MCU; the seventh resistor R7, the fifth resistor R5 and the fourth resistor R4 are sequentially connected in series and then connected between the direct-current power supply and the ground wire, wherein the fourth resistor R4 is grounded; one end of the third resistor R3 is connected to the positive output end of the rotary transformer TR, and the other end is connected to the common end of the fourth resistor R4 and the fifth resistor R5; one end of the sixth resistor R6 is connected to the negative output end of the rotary transformer TR, and the other end is connected to the common end of the fifth resistor R5 and the seventh resistor R7; the MCU is connected with the positive output end of the rotary transformer TR through the first resistor R1 and connected with the negative output end of the rotary transformer TR through the second resistor R2, and is used for outputting a corresponding diagnosis result according to a sine and cosine positive diagnosis signal MCU _ A + output by the first resistor R1 and a sine and cosine negative diagnosis signal MCU _ A-output by the second resistor R2.
Therefore, the sine and cosine fault diagnosis circuit for the rotary transformer TR is constructed by skillfully connecting the resistance voltage division network with the secondary output circuit of the rotary transformer TR, so that different sampling voltage conditions can be obtained when different faults of the rotary transformer TR occur, the sine and cosine fault diagnosis of the rotary transformer TR can be accurately and effectively realized at low cost, and the economic benefit of products is greatly improved.
Referring to fig. 2, fig. 2 is a schematic diagram of a sin-cos fault diagnosis circuit of a resolver TR according to another embodiment of the present disclosure.
As a specific embodiment, the sine and cosine fault diagnosis circuit of the resolver TR provided in the embodiment of the present application further includes, on the basis of the foregoing contents:
the first blocking capacitor C1 is connected with the positive output end of the rotary transformer TR and is used for outputting a sine and cosine positive decoding signal RES _ A + after blocking processing;
and the second blocking capacitor C2 connected with the negative output end of the rotary transformer TR is used for outputting a positive cosine negative decoding signal RES _ A-after blocking treatment.
Specifically, a pair of sine and cosine differential signals output by the rotary transformer TR needs to be subjected to subsequent decoding operation, and therefore, the dc blocking processing is performed by arranging the first dc blocking capacitor C1 and the second dc blocking capacitor C2, so that the sine and cosine positive decoding signal RES _ a + and the sine and cosine negative decoding signal RES _ a-obtained after the dc blocking processing are sent to a subsequent decoding circuit for decoding processing. It is easy to understand that the ac impedance of the sine and cosine differential signals is large, so that the normal operation of the decoding circuit is not affected after passing through the dc blocking capacitor.
As a specific embodiment, in the sine and cosine fault diagnosis circuit of the resolver TR provided in the embodiment of the present application, based on the above contents, the resistance values of the first resistor R1 and the second resistor R2 are equal.
Specifically, the first resistor R1 and the second resistor R2 are used for MCU sampling detection, and a larger resistance value, for example, 100k Ω, is empirically selected.
As a specific embodiment, in the sine and cosine fault diagnosis circuit of the resolver TR provided in the embodiment of the present application, based on the above contents, the resistances of the third resistor R3 and the sixth resistor R6 are equal; the seventh resistor R7, the fifth resistor R5 and the fourth resistor R4 are equal in resistance.
Specifically, in the present embodiment, the resistance values of the three voltage dividing resistors are equal. Therefore, the voltage across each voltage dividing resistor is equal, specifically VCC/3, without being connected to other circuits. Therefore, when the open circuit fault of the rotary transformer TR occurs, the magnitude of the sine and cosine positive diagnosis signal MCU _ A + sampled by the first sampling resistor is VCC/3, and the magnitude of the sine and cosine negative diagnosis signal MCU _ A-sampled by the second sampling resistor is 2 VCC/3.
Further, in the present embodiment, the resistances of the third resistor R3 and the sixth resistor R6 are equal. According to circuit symmetry, when the circuit of the rotary transformer TR is normal and has no fault, the voltage sampled by the first sampling resistor and the second sampling resistor at the same sampling point is VCC/2. The details of this case can be seen in table 2.
TABLE 2
| Fault condition of rotary transformer | MCU_A+ | MCU_A- |
| Without failure | VCC/2 | VCC/2 |
| Open circuit fault | VCC/3 | 2*VCC/3 |
| The positive output end is short-circuited to the power supply | VCC | - |
| Negative output terminal short-circuited to power supply | - | VCC |
| The positive output end is short-circuited to the ground wire | 0 | - |
| Negative output end short-circuited to ground | - | 0 |
As a specific embodiment, in the sin-cos fault diagnosis circuit of the resolver TR provided in the embodiment of the present application, based on the above contents, the resistances of the third resistor R3 and the sixth resistor R6 are greater than the resistances of the seventh resistor R7, the fifth resistor R5 and the fourth resistor R4 by one order of magnitude.
Specifically, in practical engineering applications, the resistance of the third resistor R3 (and the resistance of the sixth resistor R6) may be generally larger than the resistance of the seventh resistor R7 (and the resistance of the fifth resistor R5 and the resistance of the fourth resistor R4) by an order of magnitude in consideration of sampling error accuracy and low power consumption.
For example, as a specific embodiment, the resistance values of the third resistor R3 and the sixth resistor R6 may be both 100k Ω; the seventh resistor R7, the fifth resistor R5 and the fourth resistor R4 all have the resistance value of 10k omega.
Further, the embodiment of the application also discloses a motor controller, which comprises a rotary transformer and any one of the sine and cosine fault diagnosis circuits.
For the details of the motor controller, reference may be made to the detailed description of the sin-cos fault diagnosis circuit of the resolver, and the details will not be repeated here.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the equipment disclosed by the embodiment, the description is relatively simple because the equipment corresponds to the method disclosed by the embodiment, and the relevant parts can be referred to the method part for description.
It is further noted that, throughout this document, relational terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The technical solutions provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall into the protection scope of the present application.
Claims (7)
1. A sine and cosine fault diagnosis circuit of a rotary transformer is characterized by comprising a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an MCU (microprogrammed control Unit);
the seventh resistor, the fifth resistor and the fourth resistor are sequentially connected in series and then connected between a direct current power supply and a ground wire, wherein the fourth resistor is grounded; one end of the third resistor is connected to the positive output end of the rotary transformer, and the other end of the third resistor is connected to the common end of the fourth resistor and the fifth resistor; one end of the sixth resistor is connected to the negative output end of the rotary transformer, and the other end of the sixth resistor is connected to the common end of the fifth resistor and the seventh resistor;
the MCU is connected with the positive output end of the rotary transformer through the first resistor and connected with the negative output end of the rotary transformer through the second resistor, and is used for outputting a corresponding diagnosis result according to the sine and cosine positive diagnosis signal output by the first resistor and the sine and cosine negative diagnosis signal output by the second resistor.
2. The resolver sin-cos fault diagnosis circuit according to claim 1, further comprising:
the first blocking capacitor is connected with the positive output end of the rotary transformer and is used for outputting a sine and cosine positive decoding signal after blocking processing;
and the second blocking capacitor is connected with the negative output end of the rotary transformer and is used for outputting the positive cosine and negative decoding signals after blocking treatment.
3. The resolver sin-cos fault diagnosis circuit according to claim 1, wherein the first resistor and the second resistor have equal resistance values.
4. The resolver sin-cos fault diagnosis circuit according to any one of claims 1 to 3, wherein the third resistor and the sixth resistor have equal resistance values; the seventh resistor, the fifth resistor and the fourth resistor are equal in resistance value.
5. The resolver sin-cos fault diagnosis circuit according to claim 4, wherein the third resistor and the sixth resistor have a resistance value that is an order of magnitude larger than those of the seventh resistor, the fifth resistor and the fourth resistor.
6. The resolver sine and cosine fault diagnosis circuit according to claim 5, wherein the third resistor and the sixth resistor each have a resistance of 100k Ω; the seventh resistor, the fifth resistor and the fourth resistor are all 10k omega in resistance.
7. A motor controller comprising a resolver and the sine-cosine fault diagnosis circuit as claimed in any one of claims 1 to 6.
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