CN112067994A - Motor rotor loss testing device and testing method thereof - Google Patents

Motor rotor loss testing device and testing method thereof Download PDF

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CN112067994A
CN112067994A CN202010883558.4A CN202010883558A CN112067994A CN 112067994 A CN112067994 A CN 112067994A CN 202010883558 A CN202010883558 A CN 202010883558A CN 112067994 A CN112067994 A CN 112067994A
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chip
terminal
rotor
capacitor
loss
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陈秋
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/343—Testing dynamo-electric machines in operation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/346—Testing of armature or field windings

Abstract

The invention discloses a motor rotor loss testing device and a testing method thereof. A plurality of supersound temperature sensor (2) and a plurality of magnetic sensor (1) equipartition are on rotor winding (6) surface, rotor winding (6) twine on the rotor core, collector (3) are connected through wired mode in a plurality of magnetic sensor (1), collector (3) are connected through wireless receiver (5) in a plurality of supersound temperature sensor (2), collector (3) wired connection control mechanism (4), control mechanism (4) are wired or wireless connection memory or host computer (7). The invention adopts wired and wireless simultaneous acquisition, mutual verification and verification of the abrasion condition of the rotor core under different loads.

Description

Motor rotor loss testing device and testing method thereof
Technical Field
The invention relates to the field of motors, in particular to a motor rotor loss testing device and a testing method thereof.
Background
The motor uses the stator and the rotor to match and output power outwards, and the rotor is used as an armature core, so that the abrasion degree of the rotor can cause the phenomena of abnormal sound, increased vibration, overhigh exhaust temperature for a long time and current overload of the motor, thereby harming the normal use of the carried load.
Disclosure of Invention
The invention aims to provide a motor rotor loss testing device and a testing method thereof, which aim to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a motor rotor loss testing arrangement, shown testing arrangement includes a plurality of supersound temperature sensors 2, a plurality of magnetic force sensor 1, collector 3, control mechanism 4, wireless receiver 5 and memory or host computer 7, a plurality of supersound temperature sensors 2 and a plurality of magnetic force sensor 1 equipartition are on 6 surfaces of rotor winding, rotor winding 6 twines on the rotor core, collector 3 is connected through wired mode to a plurality of magnetic force sensor 1, a plurality of supersound temperature sensors 2 pass through wireless receiver 5 and connect collector 3, collector 3 wired connection control mechanism 4, control mechanism 4 is wired or wireless connection memory or host computer 7.
Further, the signal transmission that a plurality of supersound temperature sensors 2 will gather is to wireless receiver 5, wireless receiver 5 is with received signal transmission to collector 3, the signal transmission that a plurality of magnetic force sensor 1 will gather is to collector 3, collector 3 is signal conditioning and AD acquisition circuit, signal conditioning and AD acquisition circuit are with received signal transmission to control mechanism 4, control mechanism 4 is the singlechip, the singlechip passes through the serial ports exchange with data transmission to memory or host computer 7, signal conditioning and AD acquisition circuit, singlechip and serial ports exchange pass through the power distribution module power supply.
Furthermore, the signal conditioning and AD collecting circuit comprises a chip U5, a terminal 1 of the chip U5 is connected to a BZ terminal, a terminal 1 of the chip U5 is connected to a VREF terminal, a terminal 7 of the chip U5 is connected to one end of a capacitor C15, one end of a capacitor C16 and a terminal VOUT, the other end of the capacitor C15 is connected to the other end of a capacitor C16 and then grounded, a terminal 8 of the chip U5 is connected to one end of a resistor R5, the other end of the resistor R5 is connected to a terminal 3 of a crystal X1, a terminal 2 of the crystal X1 is grounded, a terminal 4 of the crystal X1 is connected to one end of a capacitor C24 and one end of an inductor L1, the other end of the inductor L1 is connected to one end of a capacitor C23 and a voltage V3.3, the other end of the capacitor C23 is grounded, the other end of the capacitor C24 is grounded, a terminal 9 of the chip U5 is connected to one end of the capacitor C17, one end of the capacitor C18 and the other end of the capacitor C18 are connected to the terminal VOUT 17 and then, the No. 12 end of the chip U5 is grounded, the No. 13 end of the chip U5 is connected with the BXOUT end, the No. 14 end of the chip U5 is connected with the ADS1254SCLK end, the No. 15 end of the chip U5 is connected with the CHSEL1 end, the No. 16 end of the chip U5 is connected with the CHSEL0 end, the No. 17 end of the chip U5 is grounded, and the No. 18 end of the chip U5 is connected with the VREF end.
Further, the power distribution module includes the 3.3V circuit, the 3.3V circuit includes chip U8, the one end and the VOUT end of electric capacity C21 are connected to chip U8's No. 3 end, electric capacity C21's the other end and earthing terminal are connected to chip U8's No. 1 end, electric capacity C22's one end and voltage VCC are connected to chip U8's No. 2 end, electric capacity C22's the other end ground connection.
Further, the power distribution module includes the 2.5V circuit, the 2.5V circuit includes chip U2, chip U2's No. 1 end is connected chip U2's No. 2 end, electric capacity C20's one end and VCC end, electric capacity C20's other end ground connection, chip U2's No. 5 termination ground, chip U2's No. 3 end is connected chip U2's No. 4 end, electric capacity C19's one end and VREF end, electric capacity C19's other end ground connection.
Further, power distribution module includes chip 74LV, VOUT end is connected to chip 74 LV's 1 number end, BZCTL1 end is connected to chip 74 LV's 5 number end, BZCTL1 end is connected to chip 74 LV's 7 number end, BXCTL1 end is connected to chip 74 LV's 9 number end, BXCTL end is connected to chip 74 LV's 15 number end, BXCCTL end is connected to chip 74 LV's 17 number end, BZCTL end is connected to chip 74 LV's 19 number end, chip 74 LV's 11 number end connection chip 74LV 12 number end back ground connection.
The mechanical loss of the motor is composed of bearing friction loss and rotor wind friction loss, and the rotor wind friction loss is simultaneously influenced by the roughness of the rotor surface, air density and motor rotating speed factors and is expressed by the following formula:
Figure BDA0002654891710000031
wherein a is the surface roughness of the rotor, CfIs the coefficient of friction, ρ0Is the density of the surrounding gas (kg/3m), ωmIs the angular velocity (rad/s) of rotation of the rotor, r is the radius (m) of the rotor, L is the axial length (m) of the rotor;
coefficient of friction CfThe calculation formula of (2) is as follows:
Figure BDA0002654891710000032
wherein the content of the first and second substances,
Figure BDA0002654891710000033
and
Figure BDA0002654891710000034
the radial Reynolds number and the tangential Reynolds number, the air gap length of the motor, the material property of the rotor, the rotating speed of the motor and other factors determine
Figure BDA0002654891710000035
The value of (c):
Figure BDA0002654891710000036
wherein, is the air gap length (m) of the motor, and mu is the relative magnetic permeability of the rotor material;
reynolds number in tangential direction
Figure BDA0002654891710000037
Then it is related to the nature of the air surrounding the motor:
Figure BDA0002654891710000041
wherein, vaIs the viscosity coefficient (P) of the surrounding gas.
Has the advantages that:
1. the invention adopts wired and wireless simultaneous acquisition, mutual verification and verification of the abrasion condition of the rotor core under different loads.
2. The invention carries out measurement in different areas and uses different sensors to carry out measurement, thereby comprehensively judging the loss of the rotor.
3. The acquisition system of the invention has high precision, resolution cavity, wide sampling range and high stability.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a signal acquisition flow chart of the present invention.
Fig. 3 is a circuit diagram of signal conditioning and AD acquisition according to the present invention.
FIG. 4 is a circuit diagram of a 3.3V voltage source according to the present invention.
FIG. 5 is a circuit diagram of a 2.5V voltage source according to the present invention.
Fig. 6 is a circuit diagram of a 74LV voltage source of the invention.
FIG. 7 is a distribution diagram of rotor loss density at different loads of the motor of the present invention
FIG. 8 is a graph of rotor loss density at rated load according to the present invention.
Fig. 9 is a rotor core loss density distribution diagram of the present invention, (a) an unloaded rotor core loss density distribution diagram, and (b) a loaded rotor core loss density distribution diagram.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.
As shown in fig. 1, a loss testing device for a motor rotor, the testing device includes a plurality of ultrasonic temperature sensors 2, a plurality of magnetic force sensors 1, a collector 3, a control mechanism 4, a wireless receiver 5 and a memory or an upper computer 7, a plurality of ultrasonic temperature sensors 2 and a plurality of magnetic force sensors 1 are uniformly distributed on the surface of a rotor winding 6, the rotor winding 6 is wound on a rotor core, the magnetic force sensors 1 are connected with the collector 3 in a wired manner, the ultrasonic temperature sensors 2 are connected with the collector 3 through the wireless receiver 5, the collector 3 is connected with the control mechanism 4 in a wired manner, and the control mechanism 4 is connected with the memory or the upper computer 7 in a wired or wireless manner.
As shown in fig. 2, further, the signals collected by the ultrasonic temperature sensors 2 are transmitted to the wireless receiver 5, the received signals are transmitted to the collector 3 by the wireless receiver 5, the collected signals are transmitted to the collector 3 by the magnetic force sensors 1, the collector 3 is a signal conditioning and AD collecting circuit, the received signals are transmitted to the control mechanism 4 by the signal conditioning and AD collecting circuit, the control mechanism 4 is a single chip microcomputer, the single chip microcomputer transmits data to the memory or the upper computer 7 through serial port exchange, and the signal conditioning and AD collecting circuit, the single chip microcomputer and the serial port exchange supply power through the power distribution module.
As shown in fig. 3, further, the signal conditioning and AD collecting circuit includes a chip U5, the terminal 1 of the chip U5 is connected to the BZ terminal, the terminal 1 of the chip U5 is connected to the VREF terminal, the terminal 7 of the chip U5 is connected to one terminal of a capacitor C15, one terminal of a capacitor C16 and the terminal VOUT, the other terminal of the capacitor C15 is connected to the other terminal of a capacitor C16 and then grounded, the terminal 8 of the chip U5 is connected to one terminal of a resistor R5, the other terminal of the resistor R5 is connected to the terminal 3 of a crystal oscillator X1, the terminal 2 of the crystal oscillator X1 is grounded, the terminal 4 of the crystal oscillator X1 is connected to one terminal of a capacitor C24 and one terminal of an inductor L1, the other terminal of the inductor L9 is connected to one terminal of a capacitor C23 and a voltage V3.3, the other terminal of the capacitor C23 is grounded, the other terminal of the capacitor C24 is grounded, the terminal 9 of the chip U5 is connected to one terminal of the capacitor C17, the terminal VOUT C867 and the terminal of the capacitor C18 and then grounded, the No. 12 end of the chip U5 is grounded, the No. 13 end of the chip U5 is connected with the BXOUT end, the No. 14 end of the chip U5 is connected with the ADS1254SCLK end, the No. 15 end of the chip U5 is connected with the CHSEL1 end, the No. 16 end of the chip U5 is connected with the CHSEL0 end, the No. 17 end of the chip U5 is grounded, and the No. 18 end of the chip U5 is connected with the VREF end.
In the AD acquisition circuit diagram, a network label BY is Y channel signal input passing through a signal conditioning circuit, and the channel is selected BY CHSEL0 and CHSEL1 signals sent BY a single chip microcomputer; +5V is a reference voltage provided by the chip ADR391 BUJZ-R2; SCLK, CHSEL0, CHSEL1, DOUT/DRDY, gather chip ADS1254 and singlechip interface for AD, wherein when DOUT/DRDY pin is in low level, indicate ADS1254 has already changed and is ready to be read by the singlechip, when this pin is in high level, correspond ADS1254 output, the singlechip can read data through this pin and select 8MHz crystal oscillator as the external clock source of ADS 1254.
As shown in fig. 4, further, the power distribution module includes a 3.3V circuit, the 3.3V circuit includes a chip U8, the terminal 3 of the chip U8 is connected to one end of a capacitor C21 and the terminal VOUT, the terminal 1 of the chip U8 is connected to the other end of a capacitor C21 and the ground terminal, the terminal 2 of the chip U8 is connected to one end of a capacitor C22 and the voltage VCC, and the other end of the capacitor C22 is grounded.
Further, the power distribution module includes the 2.5V circuit, the 2.5V circuit includes chip U2, chip U2's No. 1 end is connected chip U2's No. 2 end, electric capacity C20's one end and VCC end, electric capacity C20's other end ground connection, chip U2's No. 5 termination ground, chip U2's No. 3 end is connected chip U2's No. 4 end, electric capacity C19's one end and VREF end, electric capacity C19's other end ground connection.
As shown in fig. 5, the power distribution module includes a chip 74LV, a terminal 1 of the chip 74LV is connected to a terminal VOUT, a terminal 5 of the chip 74LV is connected to a terminal BZCTL1, a terminal 7 of the chip 74LV is connected to a terminal BYCTL1, a terminal 9 of the chip 74LV is connected to a terminal BXCTL1, a terminal 15 of the chip 74LV is connected to a terminal BXCTL, a terminal 17 of the chip 74LV is connected to a terminal BYCTL, a terminal 19 of the chip 74LV is connected to a terminal BZCTL, and a terminal 11 of the chip 74LV is connected to a terminal 12 of the chip 74LV and then grounded.
The single-chip microcomputer MSP430F5438 is a central control unit, and has the main function of controlling an AD acquisition chip to carry out AD acquisition and communicating with an upper computer through RS 485.
The singlechip controls the AD acquisition simulation SPI interface to communicate, the singlechip is a master, the ADS1254 is a slave, and the singlechip and the upper computer perform RS485 communication through a serial port module arranged in the singlechip and a chip SP 3481.
As shown in fig. 3-5, the power distribution of the signal acquisition system adopts a method of separately supplying power to the analog part and the digital part, so that the interference noise is reduced. The analog power supply +/-5V supplies power to the magnetic sensor and the ADS1254 analog part; +/-220V supplies power to the instrument amplifier; the +3.3V supplies power to the AD acquisition chip and the singlechip control module, which is provided by AMS 1117-3.3 and 74LV series chips of a common linear voltage stabilizer. The AMS1117 on-chip overheat shutdown circuit provides overload and overheat protection to prevent the ambient temperature from causing excessive junction temperature, damaging the chip. To ensure the stability of AMS1117, the output needs to be connected with a filter capacitor.
The loss of the motor rotor can not be neglected in the calculation under different working conditions when the loss and the characteristics of the motor rotor are calculated and analyzed, the rotor loss of the asynchronous starting permanent magnet synchronous motor model under the conditions of no load, 2.75kW (1/4 rated load) of load, 5.5kW (1/2 rated load) of load, 9kW (long-term load point) of load and 11kW (rated load condition point) of load is calculated respectively, and the eddy current loss of the permanent magnet under each load, the eddy current loss of the squirrel cage guide bars and the loss of the rotor core are obtained and shown in table 1.
TABLE 1 rotor losses at different output powers
Figure BDA0002654891710000081
Fig. 6 visually represents the loss and the contrast of each part of the rotor under different loads, and it can be seen that the loss of the squirrel cage conducting bars in the rotor is the largest, the eddy current loss of the rotor core is the larger, the eddy current loss of the permanent magnet is the smallest, and the loss of each part of the rotor is increased along with the increase of the load, the increase range of the eddy current loss of the permanent magnet and the eddy current loss of the squirrel cage conducting bars is very large, the eddy current loss of the permanent magnet under rated load is 11.2 times of the eddy current loss of the permanent magnet under no load, the eddy current loss of the squirrel cage conducting bars under rated load is 74.7 times of the eddy current loss of the squirrel cage conducting bars under no load, the increase range of the loss of the rotor core is not the former two, and the loss of the rotor core under rated load is 2.4 times. The magnitude of the load has a much greater effect on the permanent magnet eddy current losses and squirrel cage bar eddy current losses of the electric machine herein than on the rotor core losses.
The mechanical loss of the motor mainly comprises bearing friction loss and rotor wind friction loss, and the friction loss of the bearing is small and is ignored; the wind friction loss of the rotor is simultaneously influenced by the roughness of the rotor surface, the air density, the motor speed and other factors, and is expressed by the following formula:
Figure BDA0002654891710000082
wherein a is the surface roughness of the rotor, CfIs the coefficient of friction, ρ0Is the density of the surrounding gas (kg/3m), ωmIs the angular velocity (rad/s) of rotation of the rotor, r is the radius (m) of the rotor, L is the axial length (m) of the rotor;
coefficient of friction CfThe calculation formula of (2) is as follows:
Figure BDA0002654891710000091
wherein the content of the first and second substances,
Figure BDA0002654891710000092
and
Figure BDA0002654891710000093
the radial Reynolds number and the tangential Reynolds number, the air gap length of the motor, the material property of the rotor, the rotating speed of the motor and other factors determine
Figure BDA0002654891710000094
The value of (c):
Figure BDA0002654891710000095
wherein, is the air gap length (m) of the motor, and mu is the relative magnetic permeability of the rotor material;
reynolds number in tangential direction
Figure BDA0002654891710000096
Then it is related to the nature of the air surrounding the motor:
Figure BDA0002654891710000097
wherein, vaIs the viscosity coefficient (P) of the surrounding gas.
Referring to fig. 7-8, when the loss of the motor rotor is measured, the rotor core loss, the permanent magnet eddy current loss and the squirrel cage conducting bar eddy current loss under different loads are calculated and the results are analyzed, the eddy current loss of the squirrel cage conducting bar is the largest in the rotor loss proportion, the permanent magnet eddy current loss is the smallest in proportion, the loss of each part of the rotor is increased along with the increase of the load, but the loss change is affected by the change of the load to different degrees, the permanent magnet eddy current loss and the squirrel cage conducting bar eddy current loss are increased to a great extent, the permanent magnet eddy current loss under rated load is 11.2 times of the permanent magnet eddy current loss under no load, the squirrel cage conducting bar eddy current loss under rated load is 74.7 times of the squirrel cage conducting bar eddy current loss under no load, the loss increase range of the rotor core is not large, and the rotor core loss under rated load is 2.4 times of the rotor core loss under, namely, the influence of the motor load on the eddy current loss of the permanent magnet and the eddy current loss of the squirrel cage conducting bar is far larger than the influence on the rotor core loss. The mechanical loss and the winding copper loss of the motor are also calculated and analyzed. And finally, analyzing the influence of the air gap length and the stator notch width of the motor on the stator iron loss and the permanent magnet eddy current loss of the motor under the no-load condition, wherein the iron loss and the permanent magnet eddy current loss are increased along with the reduction of the air gap length, and the iron loss and the permanent magnet eddy current loss are increased along with the increase of the stator notch width.

Claims (8)

1. The utility model provides a motor rotor loss testing arrangement, its characterized in that, shown testing arrangement includes a plurality of supersound temperature sensors (2), a plurality of magnetic force sensor (1), collector (3), control mechanism (4), wireless receiver (5) and memory or host computer (7), a plurality of supersound temperature sensors (2) and a plurality of magnetic force sensor (1) equipartition are on rotor winding (6) surface, rotor winding (6) twine on the rotor core, collector (3) are connected through wired mode in a plurality of magnetic force sensor (1), collector (3) are connected through wireless receiver (5) in a plurality of supersound temperature sensors (2), collector (3) wired connection control mechanism (4), control mechanism (4) are wired or wireless connection memory or host computer (7).
2. The motor rotor loss testing device according to claim 1, wherein the ultrasonic temperature sensors (2) transmit collected signals to the wireless receiver (5), the wireless receiver (5) transmits received signals to the collector (3), the magnetic force sensors (1) transmit collected signals to the collector (3), the collector (3) is a signal conditioning and AD acquisition circuit, the signal conditioning and AD acquisition circuit transmits received signals to the control mechanism (4), the control mechanism (4) is a single chip microcomputer, the single chip microcomputer transmits data to a memory or an upper computer (7) through serial port exchange, and the signal conditioning and AD acquisition circuit, the single chip microcomputer and the serial port exchange supply power through a power distribution module.
3. The device for testing the loss of the rotor of the motor as claimed in claim 2, wherein the signal conditioning and AD acquisition circuit comprises a chip U5, the end 1 of the chip U5 is connected with the BZ end, the end 1 of the chip U5 is connected with the VREF end, the end 7 of the chip U5 is connected with one end of a capacitor C15, one end of a capacitor C16 and the VOUT end, the other end of the capacitor C15 is connected with the other end of a capacitor C16 and then grounded, the end 8 of the chip U5 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with the end 3 of a crystal X1, the end 2 of the crystal X1 is grounded, the end 4 of the crystal X1 is connected with one end of a capacitor C84 and one end of an inductor L1, the other end of the inductor L1 is connected with one end of a capacitor C23 and a voltage V3.3, the other end of the capacitor C23 is grounded, the other end of the capacitor C5 is grounded, and one end of the chip U5 is connected with the end 57324 of the capacitor, The one end and the VOUT end of electric capacity C18, ground connection behind electric capacity C18 is connected to the other end of electric capacity C17, No. 12 termination ground of chip U5, No. 13 end connection BXOUT end of chip U5, ADS1254SCLK end is connected to chip U5's No. 14 end, CHSEL1 end is connected to chip U5's No. 15 end, CHSEL0 end is connected to chip U5's No. 16 end, chip U5's No. 17 termination ground, VREF end is connected to chip U5's No. 18 end.
4. The motor rotor loss test device of claim 2, wherein the power distribution module comprises a 3.3V circuit, the 3.3V circuit comprises a chip U8, the terminal 3 of the chip U8 is connected to one end of a capacitor C21 and the terminal VOUT, the terminal 1 of the chip U8 is connected to the other end of a capacitor C21 and the ground, the terminal 2 of the chip U8 is connected to one end of a capacitor C22 and the voltage VCC, and the other end of the capacitor C22 is grounded.
5. The motor rotor loss testing device of claim 2, wherein the power distribution module comprises a 2.5V circuit, the 2.5V circuit comprises a chip U2, the terminal No. 1 of the chip U2 is connected with the terminal No. 2 of the chip U2, one end of a capacitor C20 and a VCC terminal, the other end of the capacitor C20 is grounded, the terminal No. 5 of the chip U2 is grounded, the terminal No. 3 of the chip U2 is connected with the terminal No. 4 of the chip U2, one end of the capacitor C19 and a VREF terminal, and the other end of the capacitor C19 is grounded.
6. The motor rotor loss testing device of claim 2, wherein the power distribution module comprises a chip 74LV, wherein the terminal 1 of the chip 74LV is connected to the terminal VOUT, the terminal 5 of the chip 74LV is connected to the terminal BZCTL1, the terminal 7 of the chip 74LV is connected to the terminal BYCTL1, the terminal 9 of the chip 74LV is connected to the terminal BXCTL1, the terminal 15 of the chip 74LV is connected to the terminal BXCTL, the terminal 17 of the chip 74LV is connected to the terminal BYCTL, the terminal 19 of the chip 74LV is connected to the terminal BZCTL, and the terminal 11 of the chip 74LV is connected to the terminal 12 of the chip LV 74 for grounding.
7. A testing method using the motor rotor loss testing apparatus of claim 1, characterized in that the testing method comprises the steps of:
step 1: calculating the mechanical loss of the motor rotor;
step 2: measuring data by using a motor rotor loss testing device;
and step 3: the data from step 2 is compared to the data from step 1 to conclude.
8. The method for testing the motor rotor loss testing device according to claim 7, wherein the step 1 is specifically as follows:
the mechanical loss of the motor is composed of bearing friction loss and rotor wind friction loss, and the rotor wind friction loss is simultaneously influenced by the roughness of the rotor surface, air density and motor rotating speed factors and is expressed by the following formula:
Figure FDA0002654891700000031
wherein a is the surface roughness of the rotor, CfIs the coefficient of friction, ρ0Is the density of the surrounding gas (kg/3m), ωmIs the angular velocity (rad/s) of rotation of the rotor, r is the radius (m) of the rotor, L is the axial length (m) of the rotor;
coefficient of friction CfThe calculation formula of (2) is as follows:
Figure FDA0002654891700000032
wherein the content of the first and second substances,
Figure FDA0002654891700000033
and
Figure FDA0002654891700000034
the radial Reynolds number and the tangential Reynolds number, the air gap length of the motor, the material property of the rotor, the rotating speed of the motor and other factors determine
Figure FDA0002654891700000036
The value of (c):
Figure FDA0002654891700000035
wherein, is the air gap length (m) of the motor, and mu is the relative magnetic permeability of the rotor material;
reynolds number in tangential direction
Figure FDA0002654891700000041
Then it is related to the nature of the air surrounding the motor:
Figure FDA0002654891700000042
wherein, vaIs the viscosity coefficient (P) of the surrounding gas.
CN202010883558.4A 2020-02-06 2020-08-28 Motor rotor loss testing device and testing method thereof Withdrawn CN112067994A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114552819A (en) * 2022-04-21 2022-05-27 浙江大学 Motor and method for measuring iron loss of motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114552819A (en) * 2022-04-21 2022-05-27 浙江大学 Motor and method for measuring iron loss of motor

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Application publication date: 20201211