CN105897105B - Motor rotation becomes detection conditioning circuit and rotation becomes initial position self-test self refresh method - Google Patents
Motor rotation becomes detection conditioning circuit and rotation becomes initial position self-test self refresh method Download PDFInfo
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- CN105897105B CN105897105B CN201610269929.3A CN201610269929A CN105897105B CN 105897105 B CN105897105 B CN 105897105B CN 201610269929 A CN201610269929 A CN 201610269929A CN 105897105 B CN105897105 B CN 105897105B
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Abstract
It is revolved the invention discloses a kind of motor and becomes detection conditioning circuit and rotation becomes initial position self-test self refresh method, method, which includes: electric machine controller, to be entered rotation according to model selection switching signal and become position automatic detection self refresh mode；Electric machine controller control magnetic pole is carried out to just, the absolute angle of encoder at this time is then read by rotary transformer, decoding chip and peripheral circuit, and the absolute angle to read at this time becomes initial angle as the rotation of motor and is written in software version；Electric machine controller reads the absolute angle of encoder by rotary transformer, decoding chip and peripheral circuit in real time, and becomes the electrical angle and angular rate that initial angle calculates motor in real time according to the rotation of motor in software version.The present invention is additionally arranged rotation and becomes position automatic detection self refresh mode, and under the premise of same software version, adjustment link is set in the rotation displacement effectively reduced in Motor Production Test test, and can automatic and accurate detect and updates rotation change initial angle.It the composite can be widely applied to frequency control field.
Description
Technical field
The present invention relates to frequency control field, especially a kind of motor, which revolves, becomes detection conditioning circuit and rotation change initial position certainly
Detect self refresh method.
Background technique
The current location of motor operation is most important for the vector controlled of electric system.Currently existing scheme passes through motor position
The mode of sensor or estimation is set to obtain the current location of motor, and cooperates sampling (or estimation) period to calculate motor and turns
Speed.Firstly, the precision of existing evaluation method can not compare favourably with sensor computational accuracy.Secondly, existing motor position passes
The mode of sensor has demarcated the position that good rotation becomes initial angle, the subsequent location and installation that can only be set by revolving displacement in software
To guarantee precision.However actual rotation displacement sets that there are difference with the calibration angle of software, at this point, the prior art provides two kinds
Settling mode: the first is to become initial angle to the rotation of whole motors before Motor Production Test all once to be examined, and needs successively root
One-to-one amendment is carried out to software according to the corresponding rotation angle of motor, the software of each motor in this way is different, causes every
The identical software version of platform motor control is impossible, so client is not allow such case；Another way is pair
The supplement of the first guarantees that rotation becomes initial angular accuracy by improving the precision of installation, but controls in practice for the precision of motor
For system, there are inevitable deviations for this mode, it is difficult to ensure that accurately judging the position of motor, efficient output torque.
Therefore, universal motor manufacturer is conjugated using adjustment rotation in factory test and sets come by the way of meeting output-index now, this side
Formula had not only increased the factory testing time of motor, but also reduced control precision, system effectiveness and peak torque the output property of motor
Energy.
In addition, having also appeared a kind of matching by rotary transformer, rotary transformer decoding chip and main control chip in the industry
It closes to detect the rotation of motor displacement and set mode, rotary transformer decoding chip provides excitation letter for rotary transformer in this mode
Number, and the position signal that rotary transformer exports is converted into digital quantity and is sent to main control chip, be converted to digital position signal.So
And such mode defaults the voltage magnitude of rotary transformer and rotary transformer decoding chip and phase be it is identical, not
In view of causing the two voltage magnitude and phase inconsistent situation occur because of factors such as interference, noises, motor rotation is reduced
The precision for becoming position detection even can cause rotary transformer to decode core when serious because the voltage of rotary transformer output is excessive
Piece damage.
Summary of the invention
In order to solve the above technical problems, it is an object of the invention to: a kind of precision height and safety are provided, motor rotation becomes inspection
Survey conditioning circuit.
Another object of the present invention is to: one kind is provided under the premise of same software version, can be effectively reduced motor and be gone out
Rotation in factory's test, which conjugates, sets adjustment link, and can accurately judge that rotation becomes initial angle, and rotation becomes initial position self-test certainly
Update method.
The technical solution used in the present invention is:
Motor rotation becomes detection conditioning circuit, including decoding chip first input end, the second input terminal of decoding chip, rotation change
The first output end of depressor, rotary transformer second output terminal, voltage conditioning circuit, first phase conditioning circuit and second phase
Conditioning circuit and 15V external power supply, the 15V external power supply are connect digitally by voltage conditioning circuit, the voltage conditioning electricity
The input terminal on road is also connect with the first output end of rotary transformer and rotary transformer second output terminal respectively, the voltage conditioning
The output end of circuit is also connect with the input terminal of the input terminal of first phase conditioning circuit and second phase conditioning circuit respectively,
The output end of the first phase conditioning circuit is connect with decoding chip first input end and digitally respectively, second phase
The output end of position conditioning circuit is connect with the second input terminal of decoding chip and digitally respectively.
Further, the voltage conditioning circuit includes first resistor, second resistance, the second capacitor, the 5th resistance and the 6th
Resistance, the 15V external power supply pass sequentially through first resistor, second resistance, the second capacitor, the 5th resistance and the 6th resistance in turn
With digitally connect, one end of the second resistance connects first resistor, the other end and first phase tune of the second resistance
Circuit connection is managed, one end of the 5th resistance connects the 6th resistance, and the other end and second phase of the 5th resistance improve
Circuit connection.
Further, the first phase circuit includes 3rd resistor and first capacitor, and the second phase circuit includes the
Four resistance and third capacitor, one end of the 3rd resistor and one end of first capacitor are connect with second resistance, the third
The other end of resistance is connect with decoding chip first input end, and one end of one end of the 4th resistance and third capacitor is with
The connection of five resistance, the other end of the 4th resistance are connect with the second input terminal of decoding chip, the other end of the first capacitor
And the other end of third capacitor connects digitally.
Further, the decoding chip uses AU6802 decoding chip.
Further, the voltage between first output end of rotary transformer and rotary transformer second output terminal is 1-
7V, the voltage between the second input terminal of the decoding chip first input end and decoding chip are 0-5V.
Further, the resistance value of the first resistor is 51K Ω, and the resistance value of the second resistance is 68K Ω, the third electricity
The resistance value of resistance is 30K Ω, and the resistance value of the 4th resistance is 30K Ω, and the resistance value of the 5th resistance is 68K Ω, the described 6th
The resistance value of resistance is 20K Ω, and the capacitance of the first capacitor and third capacitor is 1nF, the capacitance of second capacitor
For 100nF.
It is adopted by the present invention another solution is that
Rotation becomes initial position self-test self refresh method, comprising the following steps:
S1, electric machine controller enter rotation according to model selection switching signal and become position automatic detection self refresh mode；
S2, electric machine controller control magnetic pole then read by rotary transformer, decoding chip and peripheral circuit just
The absolute angle of encoder at this time is taken, and the rotation of the absolute angle to read at this time as motor becomes initial angle and software version is written
In；
S3, electric machine controller read the absolute angle of encoder by rotary transformer, decoding chip and peripheral circuit in real time
Degree, and the electrical angle and angular rate that initial angle calculates motor in real time are become according to the rotation of motor in software version.
Further, the step S1 specifically:
The model selection switching signal that electric machine controller is sent according to CAN communication enters rotation and becomes position automatic detection self refresh mould
Formula, the model selection switching signal include but is not limited to that revolving speed mode select signal, torque mode selection signal and rotation become
Initial angle self-test self refresh mode selection signal.
Further, the step S2 includes:
S21, electric machine controller control motor pole carry out becoming 0 to the position angle for just, making rotor；
S22, electric machine controller read pole pair timing encoder by rotary transformer, decoding chip and peripheral circuit
Absolute angle, and the rotation of the absolute angle to read at this time as motor becomes initial angle；
S23, it the rotation of motor is become into initial angle is written in the ROM for be mounted with software version and solidify.
Further, the step S3 includes:
S31, electric machine controller read motor current location volume by rotary transformer, decoding chip and peripheral circuit in real time
The absolute angle of code device；
S32, according in the absolute angle and software version of motor current location encoder motor rotation become initial angle it is real-time
Calculate motor current electrical angle and current angular rate, the current electrical angle of the motor=(motor currently revolves the angle-of change
The rotation of motor becomes initial angle in software version) ÷ revolves pole-changing logarithm × motor number of pole-pairs, the current angular rate of the motor=
(electrical angle of a detection cycle on current electrical angle-motor of motor) ÷ detection cycle.
The beneficial effect of circuit of the invention is: including decoding chip first input end, the second input terminal of decoding chip, rotation
Change the first output end of depressor, rotary transformer second output terminal, voltage conditioning circuit, first phase conditioning circuit and second
Phase conditioning circuit and 15V external power supply are additionally arranged voltage conditioning circuit, first phase conditioning circuit and second phase conditioning
Circuit, can be by the voltage magnitude conditioning of voltage conditioning circuit and the voltage-phase conditioning of phase conditioning circuit, so that rotation
The signal of transformer output finally meets the amplitude and phase requirements of decoding chip, improves the essence that motor rotation becomes position detection
Degree, reduce because rotary transformer output voltage it is excessive due to cause rotary transformer decoding chip to damage the case where, more
Add safety.
The beneficial effects of the method for the present invention is: being additionally arranged rotation and becomes position automatic detection self refresh mode, by rotating transformation
Device, decoding chip and peripheral circuit read the absolute angle of encoder at this time, and the absolute angle to read at this time is as motor
Rotation become initial angle write-in software version in, change the prior art demarcated in software it is good rotation become initial angle position side
Formula so that rotation displacement set initial angle be it is variable, need to only pass through rotary transformer, decoding chip and outer in Motor Production Test test
Enclose circuit read in real time rotation displacement set initial angle and be written into software version can be obtained corresponding motor accurate rotation change initially
Position, so that adjustment link is set in the rotation displacement effectively reduced in Motor Production Test test under the premise of same software version, and
Rotation change position automatic detection self refresh mode, which can detect for different rotations change position deviation automatic and accurate and update rotation, becomes initial angle.
Detailed description of the invention
Fig. 1 is the circuit diagram that motor of the present invention rotation becomes detection conditioning circuit；
Fig. 2 is the overall flow figure that rotation becomes initial position self-test self refresh method；
Fig. 3 is the flow chart that the rotation of the embodiment of the present invention one becomes self-test self refresh mode.
Appended drawing reference: 1, voltage conditioning circuit；2, first phase conditioning circuit；3, second phase conditioning circuit；S1(S2),
Decoding chip first input end；S3 (S4), the second input terminal of decoding chip；S1 ' (S2 '), the first output end of rotary transformer；
S3 ' (S4 '), rotary transformer second output terminal；R1, first resistor；R2, second resistance；R3,3rd resistor；R4, the 4th electricity
Resistance；R5, the 5th resistance；R6, the 6th resistance；C1, first capacitor；C2, the second capacitor；C3, third capacitor；Outside+15V, 15V
Power supply；DGND, digitally.
Specific embodiment
Referring to Fig.1, motor rotation becomes detection conditioning circuit, including the input of decoding chip first input end, decoding chip second
End, the first output end of rotary transformer, rotary transformer second output terminal, voltage conditioning circuit, first phase conditioning circuit with
And second phase conditioning circuit and 15V external power supply, the 15V external power supply is connect digitally by voltage conditioning circuit, described
The input terminal of voltage conditioning circuit is also connect with the first output end of rotary transformer and rotary transformer second output terminal respectively, institute
State the output end of voltage conditioning circuit also respectively with the input terminal of first phase conditioning circuit and second phase conditioning circuit
Input terminal connection, the output end of the first phase conditioning circuit connect with decoding chip first input end and digitally respectively
It connects, the output end of the second phase conditioning circuit is connect with the second input terminal of decoding chip and digitally respectively.
Referring to Fig.1, it is further used as preferred embodiment, the voltage conditioning circuit includes first resistor, the second electricity
Resistance, the second capacitor, the 5th resistance and the 6th resistance, the 15V external power supply pass sequentially through first resistor, second resistance, second
Capacitor, the 5th resistance and the 6th resistance so with digitally connect, one end of the second resistance connects first resistor, described the
The other end of two resistance is connect with first phase conditioning circuit, the 6th resistance of one end connection of the 5th resistance, and the described 5th
The other end of resistance is connect with second phase conditioning circuit.
Referring to Fig.1, it is further used as preferred embodiment, the first phase circuit includes 3rd resistor and the first electricity
Hold, the second phase circuit includes the 4th resistance and third capacitor, one end of the 3rd resistor and one end of first capacitor
It is connect with second resistance, the other end of the 3rd resistor is connect with decoding chip first input end, the 4th resistance
One end and one end of third capacitor are connect with the 5th resistance, the other end and the second input terminal of decoding chip of the 4th resistance
Connection, the other end of the first capacitor and the other end of third capacitor connect digitally.
It is further used as preferred embodiment, the decoding chip uses AU6802 decoding chip.
It is further used as preferred embodiment, first output end of rotary transformer and rotary transformer second export
Voltage between end is 1-7V, and the voltage between the second input terminal of the decoding chip first input end and decoding chip is 0-
5V。
It is further used as preferred embodiment, the resistance value of the first resistor is 51K Ω, the resistance value of the second resistance
For 68K Ω, the resistance value of the 3rd resistor is 30K Ω, and the resistance value of the 4th resistance is 30K Ω, the resistance of the 5th resistance
Value is 68K Ω, and the resistance value of the 6th resistance is 20K Ω, and the capacitance of the first capacitor and third capacitor is 1nF, institute
The capacitance for stating the second capacitor is 100nF.
Referring to Fig. 2, rotation becomes initial position self-test self refresh method, comprising the following steps:
S1, electric machine controller enter rotation according to model selection switching signal and become position automatic detection self refresh mode；
S2, electric machine controller control magnetic pole then read by rotary transformer, decoding chip and peripheral circuit just
The absolute angle of encoder at this time is taken, and the rotation of the absolute angle to read at this time as motor becomes initial angle and software version is written
In；
S3, electric machine controller read the absolute angle of encoder by rotary transformer, decoding chip and peripheral circuit in real time
Degree, and the electrical angle and angular rate that initial angle calculates motor in real time are become according to the rotation of motor in software version.
It is further used as preferred embodiment, the step S1 specifically:
The model selection switching signal that electric machine controller is sent according to CAN communication enters rotation and becomes position automatic detection self refresh mould
Formula, the model selection switching signal include but is not limited to that revolving speed mode select signal, torque mode selection signal and rotation become
Initial angle self-test self refresh mode selection signal.
It is further used as preferred embodiment, the step S2 includes:
S21, electric machine controller control motor pole carry out becoming 0 to the position angle for just, making rotor；
S22, electric machine controller read pole pair timing encoder by rotary transformer, decoding chip and peripheral circuit
Absolute angle, and the rotation of the absolute angle to read at this time as motor becomes initial angle；
S23, it the rotation of motor is become into initial angle is written in the ROM for be mounted with software version and solidify.
It is further used as preferred embodiment, the step S3 includes:
S31, electric machine controller read motor current location volume by rotary transformer, decoding chip and peripheral circuit in real time
The absolute angle of code device；
S32, according in the absolute angle and software version of motor current location encoder motor rotation become initial angle it is real-time
Calculate motor current electrical angle and current angular rate, the current electrical angle of the motor=(motor currently revolves the angle-of change
The rotation of motor becomes initial angle in software version) ÷ revolves pole-changing logarithm × motor number of pole-pairs, the current angular rate of the motor=
(electrical angle of a detection cycle on current electrical angle-motor of motor) ÷ detection cycle.
The present invention is further explained and is illustrated with specific embodiment with reference to the accompanying drawings of the specification.
Embodiment one
Referring to Fig.1, the first embodiment of the present invention:
In the vector controlled of motor, rotor position angle is obtained by encoder.Rotation becomes since it starts convenient, material skin
Real feature, is widely used in electric car field.The main purpose that rotation becomes initial alignment is obtained at motor position angle as 0
Corresponding encoder absolute angle (i.e. initial angle) when spending can make the position angle and encoder of motor according to this information
Absolute angle corresponds.
Electric machine controller of the invention is reading the absolute of encoder by rotary transformer, decoding chip and peripheral circuit
Continued to use the principle of the prior art when angle: rotation become pumping signal that decoding chip generates through pumping signal conditioning circuit export to
Rotary transformer, then the rotation detected is become SIN signal by rotary transformer and rotation becomes COS signal and is re-fed into decoding chip work
Processing, last decoding chip pass through level shifting circuit in a parallel fashion and motor position signal are sent to DSP, passed through by DSP
The absolute angle of encoder is obtained after processing.Rotation of the invention becomes decoding chip and uses the river Duo Mo company decoding chip AU6802
(such as AU6802N1), it is specifically used to provide pumping signal for rotary transformer, and the position of rotary transformer output is believed
Number being converted to digital quantity is sent to DSP.The present invention, which is revolved, inputs conditioning circuit and pumping signal tune in the peripheral circuit for becoming decoding chip
Reason circuit has continued to use the included interface circuit of AU6802N1 decoding chip, is not described in detail herein.And in order to improve motor rotation
The voltage of the precision and reduction rotary transformer output that become position detection is excessive and rotary transformer decoding chip is caused to damage
The case where occur, the present invention also specially devise Fig. 1 motor rotation become detection conditioning circuit.
As shown in Figure 1, motor rotation of the invention become detection conditioning circuit include decoding chip first input end S1 (S2),
Decoding chip the second input terminal S3 (S4), rotary transformer the first output end S1 ' (S2 '), rotary transformer second output terminal S3 '
(S4 '), voltage conditioning circuit 1, first phase conditioning circuit 2 and second phase conditioning circuit 3 and 15V external power supply.
Wherein, voltage conditioning circuit 1 is improved for the voltage magnitude to output signal of rotary transformer, to meet
The input voltage requirement of AU6802N1 decoding chip.Voltage conditioning circuit is by first resistor, second resistance, the second capacitor, the 5th
Resistance and the 6th resistance composition.
First phase conditioning circuit 2 and second phase conditioning circuit 3, for the voltage to output signal of rotary transformer
Phase is improved, and the shadow caused by detection accuracy due to rotary transformer and AU6802N1 decoding chip phase are inconsistent is reduced
It rings.First phase circuit 2 is made of 3rd resistor and first capacitor, and second phase circuit 3 is by the 4th resistance and third capacitor
Composition.
If the voltage between rotary transformer second output terminal is 1-7V, motor rotation becomes input, and (i.e. 15V external power supply is defeated
Enter) electric current 10mA, when voltage 15V, then need series connection resistance value RAlways=15V ÷ 10mA=150k Ω.And it is decoded according to AU6802N1
The requirement of chip, the input voltage of AU6802N1 decoding chip is less than or equal to 5V, therefore the voltage that motor rotation becomes output also should be less than
Equal to 5V.Based on comprehensively considering for the above two o'clock, the parameter that motor rotation of the present invention becomes each device in detection conditioning circuit is respectively as follows:
The resistance value of first resistor is 51K Ω, and the resistance value of second resistance is 68K Ω, and the resistance value of 3rd resistor is 30K Ω, the 4th resistance
Resistance value is 30K Ω, and the resistance value of the 5th resistance is 68K Ω, and the resistance value of the 6th resistance is 20K Ω, first capacitor and third capacitor
Capacitance is 1nF, and the capacitance of the second capacitor is 100nF.
Embodiment two
Reference Fig. 2 and Fig. 3, the second embodiment of the present invention:
In order in the production of batch electric system, solve to require software version one under the premise of rotation change consistency is difficult to ensure
The rotation of motor brought by causing becomes initial position parameters offset issue, and the invention proposes a kind of rotations to become initial position self-test from more
New method.The realization principle of self-test self refresh method of the present invention is as follows:
The present invention is provided with motor rotation and becomes initial angle detection pattern, and in electric system exfactory inspection, electric machine controller can
To enter the mode by communication instruction (such as CAN communication instruction), automatic aligning motor-field direction records and stores and revolves at this time
Varied angle becomes initial angle as the changeless rotation of other subsequent control functions comprising:
A) motor rotation becomes initial angle detection and renewal model handoff functionality；
B) rotation becomes initial angle position detection function.
Electric machine controller can send (including the revolving speed model selection of corresponding model selection switching signal by CAN communication
Signal, torque mode selection signal and rotation become initial angle self-test self refresh mode selection signal) become initial into motor rotation
Angle detection and renewal model handoff functionality realize that motor-field becomes position detecting function to orthofunction, rotation, rotation becomes initial after
Angle variable calibrating function, as shown in Figure 3.
After electric machine controller enters rotation change initial position detection mode, motor pole is controlled to the q axis weight for just, making motor
It closes, the position angle of rotor is 0 at this time, records the absolute angle of encoder at this time, and the rotation as this motor becomes initial
Angle Sita0.In this mode, setting rotation becomes initial angle as changeable amount, and the rotation that real-time detection is arrived becomes initial angle write-in software
In version, become initial angular dimensions as the fixed rotation under the motor hereafter other control models (such as revolving speed mode, torque mode).
After fixed rotation becomes initial angular dimensions, electrical angle Deta=(SitaX-Sita0)/rotation pole-changing logarithm * motor of motor
Number of pole-pairs.The angular rate of motor=(the current upper detection cycle electrical angle Deta0 of electrical angle Deta1-)/detection cycle.
Present invention employs a kind of rotations to become initial position self-test self refresh technology, is guaranteeing batch electric system software one
Under the premise of cause, position deviation can be become for the rotation of different motors, automatic and accurate, which detects and updates rotation, becomes initial angle.The present invention can be with
It realizes:
A. it in batch off-line test, is adjusted without revolving change initial position to motor, can be obtained corresponding motor
Accurate rotation becomes initial position, reduces hardware adjustment workload and difficulty；
B. in such a way that software pattern switches, it is ensured that the software conformance of bulk article；
C. rotation become self-test self refresh technology can guarantee every motor rotation become initial angle all with match motor height one
It causes, improves the control accuracy of system.
It is to be illustrated to preferable implementation of the invention, but the invention is not limited to the implementation above
Example, those skilled in the art can also make various equivalent variations on the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.
Claims (4)
1. motor rotation becomes detection conditioning circuit, it is characterised in that: inputted including decoding chip first input end, decoding chip second
End, the first output end of rotary transformer, rotary transformer second output terminal, voltage conditioning circuit, first phase conditioning circuit with
And second phase conditioning circuit and 15V external power supply, the 15V external power supply is connect digitally by voltage conditioning circuit, described
The input terminal of voltage conditioning circuit is also connect with the first output end of rotary transformer and rotary transformer second output terminal respectively, institute
State the output end of voltage conditioning circuit also respectively with the input terminal of first phase conditioning circuit and second phase conditioning circuit
Input terminal connection, the output end of the first phase conditioning circuit connect with decoding chip first input end and digitally respectively
It connects, the output end of the second phase conditioning circuit is connect with the second input terminal of decoding chip and digitally respectively；
The voltage conditioning circuit includes first resistor, second resistance, the second capacitor, the 5th resistance and the 6th resistance, the 15V
External power supply pass sequentially through first resistor, second resistance, the second capacitor, the 5th resistance and the 6th resistance so that with digitally connect
It connecing, one end of the second resistance connects first resistor, and the other end of the second resistance is connect with first phase conditioning circuit,
One end of 5th resistance connects the 6th resistance, and the other end of the 5th resistance is connect with second phase conditioning circuit；
The first phase circuit includes 3rd resistor and first capacitor, and the second phase circuit includes the 4th resistance and third
Capacitor, one end of the 3rd resistor and one end of first capacitor are connect with second resistance, the other end of the 3rd resistor
It being connect with decoding chip first input end, one end of the 4th resistance and one end of third capacitor are connect with the 5th resistance,
The other end of 4th resistance is connect with the second input terminal of decoding chip, the other end and third capacitor of the first capacitor
The other end connect digitally.
2. motor rotation according to claim 1 becomes detection conditioning circuit, it is characterised in that: the decoding chip uses
AU6802 decoding chip.
3. motor rotation according to claim 1 becomes detection conditioning circuit, it is characterised in that: the rotary transformer first is defeated
Voltage between outlet and rotary transformer second output terminal is 1-7V, the decoding chip first input end and decoding chip the
Voltage between two input terminals is 0-5V.
4. motor according to claim 1 rotation becomes detection conditioning circuit, it is characterised in that: the resistance value of the first resistor is
51K Ω, the resistance value of the second resistance are 68K Ω, and the resistance value of the 3rd resistor is 30K Ω, the resistance value of the 4th resistance
For 30K Ω, the resistance value of the 5th resistance is 68K Ω, and the resistance value of the 6th resistance is 20K Ω, the first capacitor and the
The capacitance of three capacitors is 1nF, and the capacitance of second capacitor is 100nF.
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| CN109586250B (en) * | 2018-12-03 | 2020-05-08 | 中冶南方（武汉）自动化有限公司 | Detection and protection method for initial angle deviation of rotary transformer |
| CN110798111B (en) * | 2019-10-25 | 2021-09-03 | 南京越博动力系统股份有限公司 | Method and device for detecting zero position of rotary transformer of permanent magnet synchronous motor |
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| CN110879550A (en) * | 2019-11-29 | 2020-03-13 | 湖北汽车工业学院 | Motor control system and CAN communication method |
| CN113411015B (en) * | 2021-08-03 | 2023-10-31 | 广州小鹏汽车科技有限公司 | Motor rotation initial angle calibration method and system and electronic equipment |
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