CN114679114A - Real-time monitoring method for temperature of high-speed permanent magnet motor rotor - Google Patents

Real-time monitoring method for temperature of high-speed permanent magnet motor rotor Download PDF

Info

Publication number
CN114679114A
CN114679114A CN202210316914.3A CN202210316914A CN114679114A CN 114679114 A CN114679114 A CN 114679114A CN 202210316914 A CN202210316914 A CN 202210316914A CN 114679114 A CN114679114 A CN 114679114A
Authority
CN
China
Prior art keywords
permanent magnet
temperature
magnet motor
speed permanent
resistor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210316914.3A
Other languages
Chinese (zh)
Inventor
刘凯歌
邓智泉
许欣
庞古才
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing University of Aeronautics and Astronautics
Original Assignee
Nanjing University of Aeronautics and Astronautics
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanjing University of Aeronautics and Astronautics filed Critical Nanjing University of Aeronautics and Astronautics
Priority to CN202210316914.3A priority Critical patent/CN114679114A/en
Publication of CN114679114A publication Critical patent/CN114679114A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/60—Controlling or determining the temperature of the motor or of the drive
    • H02P29/66—Controlling or determining the temperature of the rotor
    • H02P29/662—Controlling or determining the temperature of the rotor the rotor having permanent magnets
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/36—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using magnetic elements, e.g. magnets, coils
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/022—Synchronous motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/60—Controlling or determining the temperature of the motor or of the drive
    • H02P29/67—Controlling or determining the motor temperature by back electromotive force [back-EMF] evaluation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
    • H02P2207/05—Synchronous machines, e.g. with permanent magnets or DC excitation

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

The invention discloses a real-time monitoring method for the temperature of a high-speed permanent magnet motor rotor, which comprises the following steps: (1) measuring and recording the ambient temperature at the moment when the high-speed permanent magnet motor is cooled to the room temperature, and recording as t1(ii) a Obtaining an ambient temperature of t1Residual magnetic flux density B of permanent magnetr(t1) (ii) a (2) The method comprises the steps of obtaining three-phase current values of a stator of the high-speed permanent magnet motor and converting the three-phase current values into direct-axis currents I under a two-phase coordinate systemdQuadrature axis current Iq(ii) a Obtaining load air gap potential E of high-speed permanent magnet motorδ(ii) a Calculating the no-load back electromotive force E of the high-speed permanent magnet motor0(ii) a (3) According to the no-load back electromotive force E of the high-speed permanent magnet motor0Obtaining main no-load flux phiδ0(ii) a (4) Using no-load main magnetic flux phiδ0Calculating the real-time temperature as t2Residual magnetic flux density B of permanent magnetr(t2) (ii) a (5) According to real-time temperature t2Residual magnetic flux density B of permanent magnetr(t2) Finally, the real-time temperature t of the rotor is obtained2. The invention can monitor the temperature of the rotor of the high-speed permanent magnet motor in real time in the running process.

Description

Real-time monitoring method for temperature of high-speed permanent magnet motor rotor
Technical Field
The invention relates to the technical field of high-speed motors, in particular to a real-time monitoring method for the temperature of a rotor of a high-speed permanent magnet motor.
Background
The temperature monitoring objects of the high-speed permanent magnet motor mainly comprise a stator winding and a rotor permanent magnet, and are also used for monitoring the temperature of core components of the motor. When the temperature of the high-speed permanent magnet motor is monitored, the temperature of a non-rotating part is easier to monitor, and the temperature monitoring of the rotor permanent magnet corresponding to the temperature monitoring is for the temperature monitoring of a rotating object, so that the technical challenge is greater. The heat dissipation condition of the high-speed permanent magnet motor rotor is poor, and the phenomenon that the permanent magnet is demagnetized and even irreversible demagnetization occurs due to overhigh temperature rise can be caused. Therefore, the real-time monitoring of the rotor temperature of the high-speed permanent magnet motor is very important for monitoring the safe operation of the motor. In addition, real-time monitoring data of the rotor temperature is essential basic data for motor design optimization.
In the prior art, a rotor permanent magnet temperature monitoring technology can monitor the temperature of a permanent magnet through an infrared thermal imager (only limited to a surface-mounted permanent magnet synchronous motor or an embedded permanent magnet synchronous motor), an infrared thermal sensor and slip ring signal transmission. The latter, though, greatly changes the mechanical structural characteristics of the motor and is expensive to monitor; the use of an infrared thermal imager to monitor the temperature of the permanent magnet imposes strict requirements on the type of permanent magnet synchronous motor and must be monitored under an offline condition. In the prior art, a parameter estimation method is adopted to measure the temperature of the rotor, parameters related to the temperature, such as the resistance of a stator winding of the permanent magnet synchronous motor, the flux linkage of a permanent magnet and the like, are estimated, and the purpose of online monitoring of the temperature of the permanent magnet synchronous motor is achieved by utilizing the approximate linear relation between the parameters and the temperature. The method is based on the assumption that the temperatures of the stator and the rotor are equal, is not consistent with the reality, can not accurately reflect the temperature of the rotor, has large delay in time, and can not meet the requirement of monitoring the temperature of the rotor.
The back electromotive force method is used for measuring the temperature of the rotor, and is based on the phenomenon that reversible demagnetization occurs in a certain temperature range along with the rise of working temperature of permanent magnets such as aluminum-nickel-cobalt, ferrite, neodymium-iron-boron and the like, and the temperature coefficient of the permanent magnets is a constant value in a certain range. The equivalent air gap of the high-speed permanent magnet motor is large, and in order to ensure that the high-speed permanent magnet motor can generate enough magnetic field intensity, the permanent magnet material usually adopts neodymium iron boron or samarium cobalt with high coercivity. The high-speed permanent magnet motor mainly utilizes two types of permanent magnet materials of neodymium iron boron and samarium cobalt alloy, the temperature coefficients of the neodymium iron boron and the samarium cobalt alloy are constant in the temperature range of normal operation of the motor and do not change along with the change of temperature, and the accuracy of the temperature of the rotor is ensured. The temperature coefficient of the neodymium iron boron is-0.13%/K to-0.09%/K, and the temperature coefficient of the samarium cobalt alloy is-0.01%/K to-0.03%/K. The temperature of the permanent magnet rises, the residual magnetic flux density of the permanent magnet is reduced, and the back electromotive force of the permanent magnet obtained by measurement is also reduced; the temperature coefficient of the residual magnetic flux density of the permanent magnet does not change along with the change of temperature in a certain range, and the relation between the residual magnetic flux density and the temperature can be obtained; considering that the back electromotive force is related to the rotating speed of the rotor, the method integrates the back electromotive force to obtain the magnetic flux of the coil, and the calculation formula of the coil magnetic flux and the temperature of the permanent magnet can be further deduced by deducing the expression of the residual magnetic flux density of the coil magnetic flux and the permanent magnet. However, in order to obtain the counter potential acted only by the permanent magnet during the experiment, the motor needs to be powered off, and the temperature of the rotor permanent magnet is difficult to monitor in real time during the operation process.
Disclosure of Invention
The invention aims to: aiming at the defects, the invention provides a real-time monitoring method for the rotor temperature of the high-speed permanent magnet motor, which can obtain the real-time temperature of the rotor of the high-speed permanent magnet motor in the running process, thereby avoiding the phenomena of demagnetization of a permanent magnet, even irreversible demagnetization and the like caused by overhigh temperature rise in the running process.
The technical scheme is as follows: in order to solve the problems, the invention provides a real-time monitoring method for the temperature of a high-speed permanent magnet motor rotor, which comprises the following steps:
(1) measuring and recording the environmental temperature at the moment when the high-speed permanent magnet motor is cooled to the room temperature, and recording the environmental temperature as t1(ii) a Obtaining an ambient temperature of t1Residual magnetic flux density B of permanent magnetr(t1) The formula is as follows:
Br(t1)＝[1+(t1-20)αBr]·Br20
in the formula, temperature coefficient αBrRepresents the percentage of decrease in residual flux density per 1K increase in temperature of the permanent magnet material; b isr20Represents the residual magnetic flux density of the permanent magnet at 20 ℃;
(2) obtaining three-phase current value of the stator of the high-speed permanent magnet motor and converting the three-phase current value into direct-axis current I under a two-phase coordinate systemdQuadrature axis current IqCounting; obtaining load air gap potential E of high-speed permanent magnet motorδ(ii) a Calculating the no-load back electromotive force E of the high-speed permanent magnet motor0The formula is as follows:
Figure BDA0003570078710000021
in the formula, XadFor direct-axis armature reaction reactance, XaqIs a quadrature axis armature reactive reactance; xad、XaqDesigning parameters for the motor, wherein the parameters are not changed in the operation process;
(3) according to the no-load back electromotive force E of the high-speed permanent magnet motor0Obtaining main no-load flux phiδ0The formula is as follows:
E0＝2.22fKdpKskKφNφφδ0
wherein f is the frequency of the electromagnetic field, KdpIs the winding coefficient, KskIs the winding distribution coefficient, KφIs the air gap flux form factor, NφThe number of the series conductors of each phase of winding;
(4) using no-load main magnetic flux phiδ0Calculating the real-time temperature as t2Residual magnetic flux density B of permanent magnetr(t2) The formula is as follows:
Figure BDA0003570078710000022
in the formula, bm0Is the coefficient of the no-load operating point of the permanent magnet, SmIs the area of the permanent magnet under each pole, σ0Is the no-load magnetic leakage coefficient;
(5) according to real-time temperature t2Residual magnetic flux density B of permanent magnetr(t2) Finally, the real-time temperature t of the rotor is obtained2The formula is as follows:
Br(t2)＝[1+(t2-t1)αBr]·Br(t1)。
further, acquiring load air gap potential E of the high-speed permanent magnet motor in the step (2)δThe method specifically comprises the following steps:
(2.1) respectively installing a measuring coil on two stator slots of the high-speed permanent magnet motor, connecting the two measuring coils to a voltage sensor, and measuring the voltage of the two measuring coils by using the voltage sensor; the included angle between two connecting lines formed by the two stator slots and the axis is a slot pitch angle alpha;
Figure BDA0003570078710000031
in the formula, p represents a polar pair number; z represents the number of slots of the motor stator;
(2.2) designing a conditioning circuit, wherein the conditioning circuit is used for displacing the voltage obtained by the voltage sensor to a range of 0-3.3V and converting the voltage into a digital signal through an ADC (analog to digital converter) for outputting;
(2.3) reading the voltage value output by the conditioning circuit by adopting DSP equipment, wherein the voltage is the load air gap potential E of the high-speed permanent magnet motorδ。
Furthermore, the number of turns of the measuring coil is 1.
Further, the conditioning circuit includes: the device comprises a first conditioning module, a second conditioning module and an AD conversion module;
the first conditioning module comprises a first resistor, a second resistor and a first amplifier; one end of the first resistor is connected with the output end of the voltage sensor, and the other end of the first resistor is connected with one end of the second resistor and the non-inverting input end of the first amplifier; the other end of the second resistor is grounded; the inverting input end of the first amplifier and the output end of the first amplifier are connected with the input end of the second conditioning module;
the second conditioning module comprises two third resistors, a second operational amplifier and two fourth resistors; one end of one third resistor is used as the input end of the second conditioning module, and the other end of the third resistor is connected with the non-inverting input end of the second operational amplifier; one end of the other third resistor is connected with a positive voltage, and the other end of the resistor is connected with the non-inverting input end of the second operational amplifier; the inverting input end of the second operational amplifier is connected with one end of each of the two fourth resistors, the other end of one of the fourth resistors is grounded, and the other end of the other fourth resistor and the output end of the second operational amplifier are connected to the AD conversion module.
Further, the three-phase current value of the stator of the high-speed permanent magnet motor obtained in the step (2) is directly obtained by adopting a high-speed motor controller.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: 1. the invention can obtain the real-time temperature of the rotor in the running process of the high-speed permanent magnet motor without stopping the machine to measure the temperature of the rotor; 2. the invention can realize accurate real-time monitoring of the rotor temperature of the high-speed permanent magnet motor, has no large delay in time, and can meet the requirement of monitoring the rotor temperature.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a schematic diagram of the present invention for obtaining the load air gap potential of a high speed permanent magnet machine;
fig. 3 is a schematic diagram of a conditioning circuit in the system of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 1, the present invention further provides a monitoring method of a real-time monitoring system for the rotor temperature of a high-speed permanent magnet motor, comprising the following steps:
the method comprises the following steps:
in a high-speed permanent magnet motorWhen the temperature is completely cooled to room temperature, the ambient temperature at that time is measured and recorded as t1(ii) a During the operation of the high-speed permanent magnet motor, the environment temperature t needs to be kept1And is not changed. According to the temperature coefficient alpha of the permanent magnet material fixed in a certain temperature rangeBrPermanent magnet residual magnetic flux density B at 20 DEG Cr20Obtaining an ambient temperature of t1Residual magnetic flux density B of permanent magnetr(t1) The formula is as follows:
Br(t1)＝[1+(t1-20)αBr]·Br20
in the formula, temperature coefficient αBrRepresents the percentage of decrease in residual flux density per 1K increase in temperature of the permanent magnet material; for example, the temperature coefficient of Nd-Fe-B is-0.13%/K to-0.09%/K, and the temperature coefficient of samarium-cobalt alloy is-0.01%/K to-0.03%/K. B isr20The residual magnetic flux density of the permanent magnet at 20 ℃ is shown.
Step two:
1. obtaining phase current values i of three phases of high-speed permanent magnet motor statora、ib、icAnd converting the current into a direct axis current I under a two-phase coordinate system by using three-phase/two-phase conversion (3/2 conversion)dQuadrature axis current Iq(ii) a As shown in fig. 2, in which phase current values of three phases of the stator of the high-speed permanent magnet motor are directly acquired by the high-speed motor controller 3;
2. obtaining load air gap potential E of high-speed permanent magnet motorδ(ii) a The method specifically comprises the following steps: as shown in figure 2 of the drawings, in which,
(1) the method comprises the following steps that a measuring coil 2 with the number of turns of 1 coil is respectively arranged on two stator slots of a high-speed permanent magnet motor 1, the two measuring coils 2 are connected with a voltage sensor 4, and the voltage of the two measuring coils 2 is measured by the voltage sensor 4; the included angle between two straight lines formed by the two stator slots and the axis is a slot pitch angle alpha;
Figure BDA0003570078710000041
wherein p represents the number of polar pairs; z represents the number of slots of the motor stator;
(2) designing a conditioning circuit 5, wherein the conditioning circuit 5 displaces the voltage obtained by the voltage sensor 4 to a range of 0-3.3V, and converts the voltage into a digital signal through an ADC (analog to digital converter) and outputs the digital signal; the conditioning circuit is shown in fig. 3, and specifically includes: a first conditioning module 7, a second conditioning module 8 and an AD conversion module 9.
Said first conditioning module 7 comprises a resistor R1A second resistor R2And a first amplifier U1(ii) a A first resistor R1Is connected with the output end of the voltage sensor 4, and the other end is connected with the second resistor R2And a first amplifier U1The non-inverting input terminal of (a); a second resistor R2The other end of the first and second electrodes is grounded; first amplifier U1Inverting input terminal of, first amplifier U1The output end of the first conditioning module is connected with the input end of the second conditioning module;
the second conditioning module 8 comprises two third resistors R3A second operational amplifier U2Two fourth resistors R4(ii) a One of the third resistors R3As an input of the second conditioning module, the third resistor R3The other end of the first operational amplifier U is connected with a second operational amplifier U2The non-inverting input terminal of (a); another third resistor R3One end of the resistor is connected with a positive voltage, and the other end of the resistor is connected with a second operational amplifier U2The non-inverting input terminal of (1); second operational amplifier U2And two fourth resistors R4Is connected to one end of a fourth resistor R4The other end of the first resistor is grounded, and the other end of the second resistor is connected with the ground4And the other end of the first operational amplifier U and a second operational amplifier U2The output end of the voltage converter is connected to the AD conversion module 9, and the voltage with the range of 0-3.3V is input into the AD conversion module 9, and the AD conversion module 9 performs AD conversion on the voltage signal into a digital signal and outputs the digital signal.
(3) The voltage value output by the conditioning circuit 5 is read in real time by adopting the DSP equipment 6, and the voltage is the load air gap potential E of the high-speed permanent magnet motorδ。
3. According to the obtained load air gap potential E of the high-speed permanent magnet motorδDirect axis current IdQuadrature axis current Iq(ii) a MeterCalculating the no-load back electromotive force E of the high-speed permanent magnet motor0The formula is as follows:
Figure BDA0003570078710000051
in the formula IdFor performing three-phase/two-phase conversion (3/2 conversion) on the straight shaft and IqTo perform three-phase/two-phase conversion (3/2 conversion) and then to obtain quadrature axis current; xadFor direct-axis armature reaction reactance, XaqIs a quadrature axis armature reactive reactance; xad、XaqThe design parameters for the motor are not changed during the operation process.
Step three:
the no-load counter electromotive force of the high-speed permanent magnet motor is generated in a high-speed permanent magnet motor winding by the air gap flux density, and the specific formula is as follows:
E0＝2.22fKdpKskKφNφφδ0
wherein f is the frequency of the electromagnetic field, KdpIs the winding factor, KskIs the winding distribution coefficient, KφIs the air gap flux form factor, NφThe number of the series conductors of each phase of winding; f is not changed when the rotating speed is fixed; kdp、Ksk、KφThe motor is determined by a magnetic circuit and a winding of the motor and does not change in the operation process; n is a radical ofφThe design parameters of the motor are not changed in the running process. According to the obtained no-load back electromotive force E of the high-speed permanent magnet motor0The main no-load flux phi is obtained by calculationδ0。
Step four:
using no-load main magnetic flux phiδ0Calculating the real-time temperature as t2Residual magnetic flux density B of permanent magnetr(t2) The calculation formula of the no-load main magnetic flux is as follows:
Figure BDA0003570078710000061
in the formula, bm0Is the coefficient of the no-load operating point of the permanent magnet, SmIs the area of the permanent magnet under each pole, σ0Is the no-load magnetic leakage coefficient; the three parameters are the design parameters of the high-speed permanent magnet motor, and cannot be changed in the running process of the motor. B isr(t2) For a real-time temperature of t2The value of the residual magnetic flux density of the permanent magnet at the time can be calculated by the above expression.
Step five:
according to the temperature coefficient alpha of the permanent magnet material fixed in a certain temperature rangeBr、t1Residual magnetic flux density B of permanent magnetr(t1) Real time temperature of t2Residual magnetic flux density B of permanent magnetr(t2) Finally, the real-time temperature t of the rotor is obtained2The formula is as follows:
Br(t2)＝[1+(t2-t1)αBr]·Br(t1)。

Claims (5)

1. a real-time monitoring method for the rotor temperature of a high-speed permanent magnet motor is characterized by comprising the following steps:
(1) measuring and recording the environmental temperature at the moment when the high-speed permanent magnet motor is cooled to the room temperature, and recording the environmental temperature as t1(ii) a Obtaining an ambient temperature of t1Residual magnetic flux density B of permanent magnetr(t1) The formula is as follows:
Br(t1)＝[1+(t1-20)αBr]·Br20
in the formula, temperature coefficient αBrRepresents the percentage of decrease in residual flux density per 1K increase in temperature of the permanent magnet material; b isr20Represents the residual magnetic flux density of the permanent magnet at 20 ℃;
(2) obtaining three-phase current value of the stator of the high-speed permanent magnet motor and converting the three-phase current value into direct-axis current I under a two-phase coordinate systemdQuadrature axis current Iq(ii) a Obtaining load air gap potential E of high-speed permanent magnet motorδ(ii) a Calculating the no-load back electromotive force E of the high-speed permanent magnet motor0The formula is as follows:
Figure FDA0003570078700000011
in the formula, XadFor direct-axis armature reaction reactance, XaqIs a quadrature axis armature reactive reactance; xad、XaqDesigning parameters for the motor, wherein the parameters are not changed in the operation process;
(3) according to the no-load back electromotive force E of the high-speed permanent magnet motor0Obtaining main no-load flux phiδ0The formula is as follows:
E0＝2.22fKdpKskKφNφφδ0
wherein f is the frequency of the electromagnetic field, KdpIs the winding factor, KskIs the winding distribution coefficient, KφIs the air gap flux form factor, NφThe number of the series conductors of each phase of winding;
(4) using no-load main magnetic flux phiδ0Calculating the real-time temperature as t2Residual magnetic flux density B of permanent magnetr(t2) The formula is as follows:
Figure FDA0003570078700000012
in the formula, bm0Is the coefficient of the no-load operating point of the permanent magnet, SmIs the area of the permanent magnet under each pole, σ0Is the no-load magnetic leakage coefficient;
(5) according to real-time temperature t2Residual magnetic flux density B of permanent magnetr(t2) Finally, the real-time temperature t of the rotor is obtained2The formula is as follows:
Br(t2)＝[1+(t2-t1)αBr]·Br(t1)。
2. the method for monitoring the rotor temperature of the high-speed permanent magnet motor in real time according to claim 1, wherein the load air gap potential E of the high-speed permanent magnet motor is obtained in the step (2)δThe method specifically comprises the following steps:
(2.1) respectively installing a measuring coil on two stator slots of the high-speed permanent magnet motor, connecting the two measuring coils to a voltage sensor, and measuring the voltage of the two measuring coils by using the voltage sensor; the included angle between two connecting lines formed by the two stator slots and the axis is a slot pitch angle alpha;
Figure FDA0003570078700000021
wherein p represents the number of polar pairs; z represents the number of slots of the motor stator;
(2.2) designing a conditioning circuit, wherein the conditioning circuit is used for displacing the voltage obtained by the voltage sensor to a range of 0-3.3V and converting the voltage into a digital signal through an ADC (analog to digital converter) for outputting;
(2.3) reading the voltage value output by the conditioning circuit by adopting DSP equipment, wherein the voltage is the load air gap potential E of the high-speed permanent magnet motorδ。
3. The method of claim 2, wherein the number of turns of the measuring coil is 1.
4. The method of claim 2, wherein the conditioning circuit comprises: the device comprises a first conditioning module, a second conditioning module and an AD conversion module;
the first conditioning module comprises a first resistor, a second resistor and a first amplifier; one end of the first resistor is connected with the output end of the voltage sensor, and the other end of the first resistor is connected with one end of the second resistor and the non-inverting input end of the first amplifier; the other end of the second resistor is grounded; the inverting input end of the first amplifier and the output end of the first amplifier are connected with the input end of the second conditioning module;
the second conditioning module comprises two third resistors, a second operational amplifier and two fourth resistors; one end of one third resistor is used as the input end of the second conditioning module, and the other end of the third resistor is connected with the non-inverting input end of the second operational amplifier; one end of the other third resistor is connected with a positive voltage, and the other end of the resistor is connected with the non-inverting input end of the second operational amplifier; the inverting input end of the second operational amplifier is connected with one end of each of the two fourth resistors, the other end of one of the fourth resistors is grounded, and the other end of the other fourth resistor and the output end of the second operational amplifier are connected to the AD conversion module.
5. The method for monitoring the rotor temperature of the high-speed permanent magnet motor according to claim 1, wherein the three-phase current values of the stator of the high-speed permanent magnet motor obtained in the step (2) are directly obtained by a high-speed motor controller.
CN202210316914.3A 2022-03-29 2022-03-29 Real-time monitoring method for temperature of high-speed permanent magnet motor rotor Pending CN114679114A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210316914.3A CN114679114A (en) 2022-03-29 2022-03-29 Real-time monitoring method for temperature of high-speed permanent magnet motor rotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210316914.3A CN114679114A (en) 2022-03-29 2022-03-29 Real-time monitoring method for temperature of high-speed permanent magnet motor rotor

Publications (1)

Publication Number Publication Date
CN114679114A true CN114679114A (en) 2022-06-28

Family

ID=82075843

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210316914.3A Pending CN114679114A (en) 2022-03-29 2022-03-29 Real-time monitoring method for temperature of high-speed permanent magnet motor rotor

Country Status (1)

Country Link
CN (1) CN114679114A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115425910A (en) * 2022-09-09 2022-12-02 磐吉奥科技股份有限公司 Temperature compensation method, device, motor controller and storage medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115425910A (en) * 2022-09-09 2022-12-02 磐吉奥科技股份有限公司 Temperature compensation method, device, motor controller and storage medium

Similar Documents

Publication Publication Date Title
Huang et al. Thermal analysis of high-speed SMC motor based on thermal network and 3-D FEA with rotational core loss included
CN104836506B (en) A kind of permanent-magnetic synchronous motor rotor zero correction system and method
CN103472312B (en) Testing method for iron core loss of alternating-current permanent magnet motors
CN114679114A (en) Real-time monitoring method for temperature of high-speed permanent magnet motor rotor
Hwang et al. Hysteresis torque estimation method based on iron-loss analysis for permanent magnet synchronous motor
CN109586651B (en) Online monitoring method for temperature of permanent magnet synchronous motor rotor
CN111721567A (en) Method and system for testing dynamic torque fluctuation of motor
Estima et al. Efficiency analysis of synchronous reluctance motors
CN110880838A (en) Device and method for detecting temperature of permanent magnet of rotor of permanent magnet synchronous motor
Mitterhofer et al. Analytical and experimental loss examination of a high speed bearingless drive
CN113533859A (en) Method for testing iron loss of permanent magnet synchronous reluctance motor
Virtic et al. Analysis of coreless stator axial flux permanent magnet synchronous generator characteristics by using equivalent circuit
Gao et al. A practical analytical expression and estimation for average torque of high saturation permanent magnet synchronous motor for special vehicles
CN101699300A (en) Method for testing direct axis reactance of built-in permanent magnet synchronous motor
Guodong et al. Analysis and experimental validation of dynamic performance for slotted limited-angle torque motor
Chu et al. Research and Analysis on Design Characteristics of High-Speed Permanent Magnet Claw Pole Motor With Soft Magnetic Composite Cores for Wide Temperature Range
Hu et al. Rotor Design and Optimization of High-speed Surface-mounted Permanent Magnet Motor Based on the Multi-physical Field Coupling Method (February 2022)
Jardan et al. Development of a dedicated laboratory system for measurement of iron losses in high speed PMSM
Chu et al. Research and analysis on design characteristics of high temperature and High-Speed Permanent magnet motor
CN115441605A (en) Six-phase switched reluctance motor and position estimation method and system for rotor without position sensor
CN110346721B (en) Method for testing loss of double-branch AC permanent magnet motor
Gao et al. Permanent magnet temperature estimation of high power density permanent magnet synchronous machines by considering magnetic saturation
CN111181452B (en) Compensation method for permanent magnet excitation performance difference in permanent magnet motor mass production
Du et al. Research on a novel combined permanent magnet electrical machine
CN110657843A (en) Magnetic drive generator performance test experiment table

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination