CN113607315B - High-speed suspension motor loading power measuring system and application thereof - Google Patents
High-speed suspension motor loading power measuring system and application thereof Download PDFInfo
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- CN113607315B CN113607315B CN202110887188.6A CN202110887188A CN113607315B CN 113607315 B CN113607315 B CN 113607315B CN 202110887188 A CN202110887188 A CN 202110887188A CN 113607315 B CN113607315 B CN 113607315B
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- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
- G01L3/242—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity by measuring and simultaneously multiplying torque and velocity
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Abstract
The invention relates to a high-speed suspension motor loading power measuring system and application thereof, belonging to the technical field of motor performance test. The device comprises a loading device, a fixed base, a torque sensor, a reflection type photoelectric sensor and a test control system, wherein the fixed base is connected with the loading device, the torque sensor and the reflection type photoelectric sensor are all connected with the test control system, torque is applied to the rotor through the loading device, and the torque and the rotating speed of the rotor are measured through the torque sensor and the reflection type photoelectric sensor. The loading device disclosed by the invention realizes torque loading at each rotating speed by utilizing electromagnetic induction, avoids rigid contact of a traditional coupler, ensures the control and stable operation of the radial position of the rotor, and realizes the performance test of the suspension rotor under the working condition of large load torque.
Description
Technical Field
The invention relates to a high-speed suspension motor loading power measuring system and application thereof, belonging to the technical field of motor performance test.
Background
The dynamometer is a device for detecting the performance of the motor, is used as an energy consumption device in a motor test system, is used for absorbing the output power of the tested motor, and can change the load and the rotating speed of an engine by controlling the dynamometer to form a required test working condition so as to measure the performance indexes of the motor in various running states during actual use. When the motor dynamometer is used, the rotating shaft of the tested motor needs to be aligned with the rotating shaft of the dynamometer, and the power of the engine can be completely transmitted to the dynamometer through the coupling connection, so that the performance of the motor is obtained through measurement.
Suspension motor has the advantage of no mechanical friction and loss, compares traditional mechanical bearing motor, and efficiency is higher, and the critical rotational speed of suspension rotor is higher. The traditional dynamometer adopts a contact type to connect a rotating shaft of the dynamometer and a rotating shaft of a tested motor, and the limit rotating speeds of a bearing and a coupling are usually far lower than the rotating speed of a suspension rotor; meanwhile, the radial position of the suspension rotor floats in the rotation process, and the axial position is not completely fixed, so that if a traditional mechanical coupling mode is adopted, when the rigidity is too high, the suspension rotor shaft and a fixed output shaft (the movement shaft is not moved) of the dynamometer can be coupled by movement and force, the radial position control and the normal stable operation of the suspension rotor are not facilitated, the torque and the rotating speed transmitted by the flexible coupling are restricted, and the performance test of the suspension rotor under the working condition of large-load torque cannot be realized.
According to the mode of generating load torque, the dynamometer generally comprises a hydraulic dynamometer, a magnetic powder dynamometer, a hysteresis dynamometer, an eddy current dynamometer and the like, but is respectively suitable for different rotating speed ranges, and torque control ranges are different, so that the loading and testing of large, medium and small load torques in full speed intervals such as locked rotor, low speed, medium speed, high speed, ultrahigh speed and the like cannot be simultaneously considered.
In view of the above problems, there is no solution at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a high-speed suspension motor loading power measuring system, wherein a loading device utilizes electromagnetic induction to realize torque loading at various rotating speeds, rigid contact of a traditional coupler is avoided, control and stable operation of the radial position of a rotor are ensured, and performance test of a suspension rotor under a large-load torque working condition is realized.
The invention also provides application of the high-speed suspension motor loading power measuring system.
The technical scheme of the invention is as follows:
a high-speed suspension motor loading power measuring system comprises a loading device, a fixed base, a torque sensor, a reflection type photoelectric sensor and a test control system, wherein,
the fixed base is connected with a loading device, the torque sensor and the reflection type photoelectric sensor are all connected with a test control system, torque is applied to the rotor through the loading device, and the torque and the rotating speed of the rotor are measured through the torque sensor and the reflection type photoelectric sensor.
Preferably, the loading device comprises a permanent magnet disc, an eddy current disc and a stator disc, the eddy current disc is fixed on the fixed base, the stator disc and the permanent magnet disc are sequentially arranged on one side of the eddy current disc, the permanent magnet disc is positioned between the eddy current disc and the stator disc, non-contact positioning is adopted among the eddy current disc, the permanent magnet disc, the eddy current disc and the stator disc, axes of the permanent magnet disc, the eddy current disc and the stator disc can not be on the same straight line, and therefore strict centering is not needed, and the installation and the use are convenient.
Preferably, the permanent magnet disc is of an annular structure, a plurality of pairs of permanent magnets are fixed on the circumference at equal intervals, radial magnetization is adopted, N poles and S poles are sequentially arranged, and inner holes of the permanent magnet disc are fixedly arranged on a rotor rotating shaft through a tensioning sleeve and a flange plate and synchronously rotate along with a rotor of the motor to be tested.
Preferably, the permanent magnet fixed on the permanent magnet disc is made of neodymium iron boron material with high coercive force and high magnetic energy product, so that the power (torque) density ratio of the system is improved.
Preferably, fan blades are additionally arranged on the back surface (i.e. the surface facing the motor to be tested) of the permanent magnetic disk, so as to dissipate heat of the system.
Preferably, the vortex disc is of an annular structure, the permanent magnet disc is arranged in the vortex disc, grooves are uniformly distributed on the circumference of the vortex disc, the number of the grooves is larger than that of the permanent magnets, and the vortex disc is fixed on the fixed base. When the permanent magnetic disk is driven by the tested motor to rotate, eddy current is induced on the inner surface of the eddy current disk due to the skin effect, the size of the eddy current is proportional to the rotating speed difference between the eddy current and the permanent magnet, the eddy current magnetic field interacts with the magnetic field generated by the permanent magnet, the acting force is proportional to the eddy current, passive load torque is generated, the permanent magnetic disk and the rotor of the tested motor are prevented from moving, and torque is applied to the rotor.
Preferably, the eddy current disc is made of high-conductivity copper or aluminum, and passive load torque is increased.
Preferably, the stator disc is of a tooth-groove-shaped structure and is arranged in the permanent magnet disc, the stator teeth are provided with windings, and the stator disc is fixed on the fixed base. When the tested motor drives the permanent magnetic disk to synchronously rotate, voltage and current corresponding to the rotating speed can be induced in the stator disk winding. And meanwhile, the winding current is controlled by a test control system, the winding current generates a magnetic field to interact with the magnetic field of the permanent magnet, an active load torque is generated to block or push the permanent magnet disc, and the torque is controlled by the winding current.
Preferably, the stator disc is made of an ultra-thin silicon steel material or an amorphous soft magnetic material, so that system loss is reduced.
The working principle of the loading device is as follows: the torque generated by the loading device on the permanent magnet disc is composed of two parts, the passive load torque corresponding to the vortex disc and the active load torque generated by the stator disc enable both the inner air gap and the outer air gap of the magnetic field generated by the permanent magnet to be utilized, the utilization efficiency of the magnet is high, the torque adjusting range is large, the stator disc and the vortex disc can be independently installed and work, namely, only the stator disc or the vortex disc is installed, the torque can be applied to the rotor through one of the stator disc and the vortex disc, the stator disc and the vortex disc can work simultaneously and are matched with each other, the size range of the loading torque is widened, and the torque loading under each rotating speed is realized. Therefore, the realization of different loading torques of the suspension rotor under all working conditions of low speed, medium speed and high speed is ensured.
The application of the high-speed suspension motor loading dynamometer system comprises the following operation steps:
(1) sleeving a permanent magnetic disk on a rotor rotating shaft of the tested motor, arranging the permanent magnetic disk between an eddy current disk and a stator disk, mounting a strain gauge type torque sensor on the rotor rotating shaft, and starting the tested motor and a test control system;
(2) the permanent magnet disc is driven by a tested motor to rotate, eddy current is induced on the inner surface of the eddy current disc due to the skin effect, and the eddy current magnetic field interacts with the magnetic field generated by the permanent magnet to generate load torque, so that the permanent magnet disc and the rotor of the tested motor are prevented from moving, and the torque is applied to the rotor;
voltage and current corresponding to the rotating speed are induced in the stator disc winding, meanwhile, the winding current is controlled through a test control system, the winding current generates a magnetic field which interacts with the magnetic field of the permanent magnet to generate active torque to block or push the permanent magnet disc, the torque is controlled by the size of the winding current, and the load torque generated by the eddy current disc and the active torque generated by the stator disc jointly form the required loading torque; the torque, the voltage and the current are analog signals obtained by a sensor and are easily interfered by an external environment, so that a filtering conditioning circuit is added in the test control system for signal processing, and the signal-to-noise ratio of the signals is improved as shown in fig. 5.
In order to realize the accurate loading of the load torque on the rotor rotating shaft, a test control system adopts torque closed-loop control, a loading test user sets the required load torque, the output of a torque sensor is collected in the loading process, and the control system outputs a control signal according to a torque error (the difference between a user input instruction and a sensor feedback signal) to control the direction and the magnitude of the current of a winding in a stator disc, so that the accurate control of the load torque on the rotor rotating shaft is realized;
(3) and (3) torque measurement: measuring the torque on the rotating shaft through a strain gauge type torque sensor;
and (3) measuring the rotating speed: the axis of the rotor rotating shaft is floating, so that an encoder is not suitable for being installed for measuring the speed, and a reflection type photoelectric sensor is arranged on a motor to be measured to measure the rotating speed of the rotor;
and (3) power calculation: and calculating the power on the rotor rotating shaft according to the torque and the rotating speed obtained by the test, wherein the calculation formula is as follows:
p ═ F ═ V ═ T/R ═ pi R ═ n/30 ═ T ═ pi ═ n/30 (1)
In formula (1), p is power in W; t is torque in Nm; n is the rotational speed in rpm.
Preferably, in the step (2), the current induced in the vortex disc is rectified by the rectifying circuit and then converted into the stator disc winding current, so that energy conversion is realized, the cost is saved, the rectifying circuit is shown in fig. 6, the input alternating current signal is rectified into direct current through D1-D4, and ripple wave fluctuation of the rectifying circuit is reduced through the capacitor.
Preferably, in the step (3), the rotation speed measurement adopts a calculation mode without adopting a sensor measurement, and the calculation process is as follows:
U＝E+IR (2)
E＝cnφ (3)
in the formula, E is induced electromotive force of the winding, c is a counter electromotive force coefficient, phi is magnetic flux, c and phi are constant values, n is rotating speed, U is voltage, I is current, and R is equivalent resistance of the winding;
and (3) calculating to obtain the induced electromotive force of the winding according to the formula (2), wherein c and phi are constant values, and the rotating speed can be obtained according to the formula (3).
The invention has the beneficial effects that:
1. the permanent magnetic disk is positioned between the vortex disk and the stator disk, the installation does not need strict centering and adjustment, the radial suspension position of the permanent magnetic disk changes along with the suspension position of the rotor, the position change does not influence the generation of the load torque of the loading device, and the loading device does not influence the control of the radial suspension position of the suspension rotor.
2. The current in the vortex disc is in a linear relation with the rotating speed of the rotor, and the passive loading torque of the vortex disc is proportional to the rotating speed; the active loading torque of the stator plate is in linear relation with the actively controlled current in the winding.
3. The vortex disc and the stator disc can be independently installed and work, can also work simultaneously, are matched with each other, widen the loading torque interval and realize torque loading at various rotating speeds. The performance of the permanent magnet disk is fully exerted.
4. The electric energy generated by the vortex disk during working can be rectified and fed back to a power grid or provided for the stator disk winding, and compared with the traditional vortex loading mode, the electric energy is absorbed instead of consumed, so that the heat generation is smaller, and the efficiency is higher.
5. The invention adopts torque closed-loop control to realize accurate torque loading control.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a permanent magnet disk of the present invention;
FIG. 3 is a schematic view of the vortex disk structure of the present invention;
FIG. 4 is a schematic view of a stator plate structure according to the present invention;
FIG. 5 is a schematic diagram of a filter circuit of the present invention;
FIG. 6 is a schematic diagram of a rectifier circuit of the present invention;
wherein: 1. a motor to be tested; 2. a rotor shaft; 3. a stator disc; 4. a permanent magnet disk; 5. a vortex disk; 6. fixing the base; 7. A permanent magnet; 8. and stator teeth.
Detailed Description
The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.
Example 1:
as shown in fig. 1-6, the present embodiment provides a high-speed levitation motor loading power measuring system, which includes a loading device, a fixed base 6, a torque sensor, a reflective photoelectric sensor and a test control system, wherein,
the fixed base is connected with a loading device, the torque sensor and the reflection type photoelectric sensor are all connected with a test control system, torque is applied to the rotor through the loading device, and the torque and the rotating speed of the rotor are measured through the torque sensor and the reflection type photoelectric sensor.
The loading device comprises a permanent magnet disc 4, an eddy current disc 5 and a stator disc 3, the eddy current disc 5 is fixed on a fixed base 6, the stator disc 3 and the permanent magnet disc 4 are sequentially arranged on one side of the eddy current disc 5, the permanent magnet disc 4 is positioned between the eddy current disc and the stator disc, non-contact positioning is adopted among the eddy current disc, the permanent magnet disc and the stator disc, axes can not be on the same straight line, strict centering is not needed, and the installation and the use are convenient.
The permanent magnet disk 4 is of an annular structure, a plurality of pairs of permanent magnets 7 are fixed on the circumference at equal intervals, radial magnetization is adopted, N poles and S poles are sequentially arranged, and inner holes of the permanent magnet disk 4 are fixedly arranged on the rotor rotating shaft 2 through a tensioning sleeve and a flange plate and synchronously rotate along with a rotor of a motor to be tested.
The permanent magnet fixed on the permanent magnet disk 4 is made of neodymium iron boron material with high coercive force and high magnetic energy product, and the power (torque) density ratio of the system is improved.
The vortex disc 5 is of an annular structure, the permanent magnet discs 4 are arranged in the vortex disc, grooves are uniformly distributed on the circumference of the vortex disc 5, the number of the grooves is larger than that of the permanent magnets, and the vortex disc 5 is fixed on the fixed base 6. When the permanent magnetic disk is driven by the tested motor to rotate, eddy current is induced on the inner surface of the eddy current disk due to the skin effect, the size of the eddy current is proportional to the rotating speed difference between the eddy current and the permanent magnet, the eddy current magnetic field interacts with the magnetic field generated by the permanent magnet, the acting force is proportional to the eddy current, passive load torque is generated, the permanent magnetic disk and the rotor of the tested motor are prevented from moving, and torque is applied to the rotor.
The vortex disc has a certain thickness, and when the thickness is too low, the vortex generated on the inner surface of the vortex disc due to the skin effect can be saturated.
The eddy current disc 5 is made of high-conductivity material copper, and passive load torque is increased.
The stator disc 3 is of a tooth-groove structure and is arranged in the permanent magnet disc, the stator teeth 8 are provided with windings, and the stator disc is fixed on the fixed base. When the tested motor drives the permanent magnetic disk to synchronously rotate, voltage and current corresponding to the rotating speed can be induced in the stator disk winding. And meanwhile, the winding current is controlled by a test control system, the winding current generates a magnetic field to interact with the magnetic field of the permanent magnet, an active load torque is generated to block or push the permanent magnet disc, and the torque is controlled by the winding current.
The stator disc 3 is made of ultra-thin silicon steel materials, and system loss is reduced.
The working principle of the loading device is as follows: the torque generated by the loading device on the permanent magnet disc is composed of two parts, the passive load torque corresponding to the vortex disc and the active load torque generated by the stator disc enable both the inner air gap and the outer air gap of the magnetic field generated by the permanent magnet to be utilized, the utilization efficiency of the magnet is high, the torque adjusting range is large, the stator disc and the vortex disc can be independently installed and work, namely, only the stator disc or the vortex disc is installed, the torque can be applied to the rotor through one of the stator disc and the vortex disc, the stator disc and the vortex disc can work simultaneously and are matched with each other, the size range of the loading torque is widened, and the torque loading under each rotating speed is realized. Therefore, the realization of different loading torques of the suspension rotor under all working conditions of low speed, medium speed and high speed is ensured.
The application of the high-speed suspension motor loading dynamometer system comprises the following operation steps:
(1) sleeving a permanent magnetic disk on a rotor rotating shaft 2 of a tested motor 1, arranging a permanent magnetic disk 4 between an eddy current disk and a stator disk, mounting a strain gauge type torque sensor on the rotor rotating shaft 2, and starting the tested motor and a test control system;
(2) the permanent magnet disc is driven by a tested motor to rotate, eddy current is induced on the inner surface of the eddy current disc due to the skin effect, and the eddy current magnetic field interacts with the magnetic field generated by the permanent magnet to generate load torque, so that the permanent magnet disc and the rotor of the tested motor are prevented from moving, and the torque is applied to the rotor;
voltage and current corresponding to the rotating speed are induced in the stator disc winding, meanwhile, the winding current is controlled through a test control system, the winding current generates a magnetic field which interacts with the magnetic field of the permanent magnet to generate active torque to block or push the permanent magnet disc, the torque is controlled by the size of the winding current, and the load torque generated by the eddy current disc and the active torque generated by the stator disc jointly form the required loading torque; the torque, the voltage and the current are analog signals obtained by a sensor and are easily interfered by an external environment, so that a filtering conditioning circuit is added in a test control system for signal processing, and the signal-to-noise ratio of the signals is improved as shown in fig. 5;
in order to realize the accurate loading of the load torque on the rotor rotating shaft, a test control system adopts torque closed-loop control, a loading test user sets the required load torque, the output of a torque sensor is collected in the loading process, and the control system outputs a control signal according to a torque error (the difference between a user input instruction and a sensor feedback signal) to control the direction and the magnitude of the current of a winding in a stator disc, so that the accurate control of the load torque on the rotor rotating shaft is realized;
(3) and (3) torque measurement: measuring the torque on the rotating shaft through a strain gauge type torque sensor;
and (3) measuring the rotating speed: the axis of the rotor rotating shaft is floating, so that an encoder is not suitable for measuring the speed, and a reflective photoelectric sensor is arranged on a motor to be measured to measure the rotating speed of the rotor;
and (3) power calculation: and calculating the power on the rotor rotating shaft according to the torque and the rotating speed obtained by the test, wherein the calculation formula is as follows:
p ═ F ═ V ═ T/R ═ pi R ═ n/30 ═ T ═ pi ═ n/30 (1)
In formula (1), p is power in W; t is torque in Nm; n is the rotational speed in rpm.
In the step (2), the current induced in the vortex disc is rectified by the rectifying circuit and then converted into the stator disc winding current, so that energy conversion is realized, the cost is saved, the rectifying circuit is shown in fig. 6, the input alternating current signal is rectified into direct current through D1-D4, and ripple wave fluctuation of the rectifying circuit is reduced through the capacitor. The filtering conditioning circuit and the rectifying circuit are both conventional circuits.
Example 2:
the structure of the high-speed suspension motor loading dynamometer system is as described in embodiment 1, and the difference is that fan blades are additionally arranged on the back surface (i.e. the surface facing the motor to be tested) of a permanent magnetic disk and used for heat dissipation of the system. The permanent magnetic disk and the tested motor rotate together, the fan blades can be driven to rotate through the rotating shaft of the motor rotor, and then heat dissipation is conducted, and round holes are uniformly distributed in the permanent magnetic disk, so that heat dissipation is facilitated.
The vortex disc is made of high-conductivity material aluminum, and passive load torque is increased. The stator disc is made of amorphous soft magnetic material.
Example 3:
the application of the high-speed suspension motor loading dynamometer system comprises the steps as described in embodiment 1, and is characterized in that in the step (3), the rotating speed is measured in a calculation mode without using a sensor, and the calculation process is as follows:
U＝E+IR (2)
E＝cnφ (3)
in the formula, E is induced electromotive force of the winding, c is a counter electromotive force coefficient, phi is magnetic flux, c and phi are constant values, n is rotating speed, U is voltage, I is current, and R is equivalent resistance of the winding;
and (3) calculating to obtain the induced electromotive force of the winding according to the formula (2), wherein c and phi are constant values, and the rotating speed can be obtained according to the formula (3).
Claims (10)
1. A high-speed suspension motor loading power measuring system is characterized by comprising a loading device, a fixed base, a torque sensor, a reflection type photoelectric sensor and a test control system, wherein,
the fixed base is connected with a loading device, the torque sensor and the reflective photoelectric sensor are all connected with a test control system, torque is applied to the rotor through the loading device, and the torque and the rotating speed of the rotor are measured through the torque sensor and the reflective photoelectric sensor;
the loading device comprises a permanent magnet disc, an eddy current disc and a stator disc, the eddy current disc is fixed on the fixed base, and the stator disc and the permanent magnet disc are sequentially arranged on one side of the eddy current disc;
the permanent magnetic disk is of an annular structure, a plurality of pairs of permanent magnets are fixed on the circumference at equal intervals, radial magnetization is adopted, and the N pole and the S pole are sequentially arranged.
2. The high-speed levitation motor loading dynamometer system of claim 1, wherein the permanent magnets fixed on the permanent magnet disk are made of neodymium iron boron material with high coercivity and high magnetic energy product.
3. The system of claim 1, wherein fan blades are attached to the back of the permanent magnet disk.
4. The system of claim 1, wherein the vortex plate is a ring structure, permanent magnets are disposed in the vortex plate, grooves are uniformly disposed on the circumference of the vortex plate, the number of the grooves is greater than that of the permanent magnets, and the vortex plate is fixed on the fixed base.
5. The high-speed levitation motor load dynamometer system of claim 4, wherein the vortex disk is made of high conductivity copper or aluminum.
6. The system of claim 4, wherein the stator plate is a slot-shaped structure and is disposed inside the permanent magnet plate, the stator teeth are provided with windings, and the stator plate is fixed on the fixed base.
7. The high speed levitation motor load dynamometer system of claim 6, wherein the stator disk is fabricated from ultra-thin silicon steel or amorphous soft magnetic material.
8. The application of the high-speed suspension motor load dynamometer system according to claim 7, wherein the operation steps are as follows:
(1) sleeving a permanent magnetic disk on a rotor rotating shaft of the tested motor, arranging the permanent magnetic disk between an eddy current disk and a stator disk, mounting a strain gauge type torque sensor on the rotor rotating shaft, and starting the tested motor and a test control system;
(2) the permanent magnet disc is driven by a tested motor to rotate, eddy current is induced on the inner surface of the eddy current disc due to the skin effect, and the eddy current magnetic field interacts with the magnetic field generated by the permanent magnet to generate load torque, so that the permanent magnet disc and the rotor of the tested motor are prevented from moving, and the torque is applied to the rotor;
voltage and current corresponding to the rotating speed are induced in the stator disc winding, meanwhile, the winding current is controlled through a test control system, the winding current generates a magnetic field which interacts with the magnetic field of the permanent magnet to generate active torque to block or push the permanent magnet disc, the torque is controlled by the size of the winding current, and the load torque generated by the eddy current disc and the active torque generated by the stator disc jointly form the required loading torque;
the test control system adopts torque closed-loop control, a loading test user sets required load torque, the output of a torque sensor is collected in the loading process, and the control system outputs a control signal according to a torque error to control the direction and the size of the current of a winding in a stator disc, so that the accurate control of the load torque on a rotor rotating shaft is realized;
(3) and (3) torque measurement: measuring the torque on the rotating shaft through a strain gauge type torque sensor;
and (3) measuring the rotating speed: a reflection type photoelectric sensor is arranged on a tested motor to measure the rotating speed of a rotor;
and (3) power calculation: and calculating the power on the rotor rotating shaft according to the torque and the rotating speed obtained by the test, wherein the calculation formula is as follows:
p ═ F ═ V ═ T/R ═ pi R ═ n/30 ═ T ═ pi ═ n/30 (1)
In formula (1), p is power in W; t is torque in Nm; n is the rotational speed in rpm.
9. The application of the high-speed suspension motor load dynamometer system of claim 8, wherein in step (2), the current induced in the eddy current disk is rectified by a rectifier circuit and then converted into the stator disk winding current.
10. The application of the system for measuring the load power of a high-speed suspension motor as claimed in claim 9, wherein in the step (3), the measurement of the rotation speed is calculated as follows:
U＝E+IR (2)
E＝cnφ (3)
in the formula, E is induced electromotive force of the winding, c is a counter electromotive force coefficient, phi is magnetic flux, c and phi are constant values, n is rotating speed, U is voltage, I is current, and R is equivalent resistance of the winding;
and (3) calculating to obtain the induced electromotive force of the winding according to the formula (2), wherein c and phi are constant values, and the rotating speed can be obtained according to the formula (3).
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