CN103869244A - Motor testing system - Google Patents

Motor testing system Download PDF

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Publication number
CN103869244A
CN103869244A CN201210547943.7A CN201210547943A CN103869244A CN 103869244 A CN103869244 A CN 103869244A CN 201210547943 A CN201210547943 A CN 201210547943A CN 103869244 A CN103869244 A CN 103869244A
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motor
load
switch
measuring system
testing circuit
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CN201210547943.7A
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CN103869244B (en
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周鹏
田野
江海涛
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CRRC Yangtze Co Ltd
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China CNR Corp Ltd
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Abstract

The invention provides a motor testing system, which comprises a load testing circuit, a no-load/locked-rotor testing circuit, a controller, and a testing device, wherein the load testing circuit is connected between a three-phase alternating current power supply and a motor to be tested, and comprises a first switch for controlling breakover or disconnection, and the no-load/locked-rotor testing circuit is connected between a three-phase alternating current power supply and a motor to be tested, and comprises a second switch for controlling breakover or disconnection; the controller is used for generating load control signals and no-load/locked-rotor control signals to be respectively supplied to the first switch and the second switch to control the connection or disconnection of the first switch and the second switch, and the testing device comprises an electric parameter acquisition element and a rotating speed sensor; the electric parameter acquisition element is arranged in the no-load/locked-rotor testing circuit and the load testing circuit, and the rotating speed sensor is arranged at the motor to be tested and is used for acquiring the rotating speed of the motor to be tested. The motor testing system solves the problem that instruments and equipment need to be changed for different testing tasks, so that the automation of the system is realized, and the testing efficiency is improved.

Description

A kind of Motor Measuring System
Technical field
The present invention relates to a kind of electrical technology, relate in particular to a kind of Motor Measuring System.
Background technology
Along with national economy and scientific and technical development, the effect that motor is brought into play in all trades and professions is more and more important.Motor product meanwhile, along with the development of every profession and trade, motor product proposed to more and more higher requirement, so need to verify whether its characteristic reaches application requirements by some pilot projects.Therefore, Motor Measuring Technology has considerable meaning for the performance verification of motor.
Existing Motor Measuring System, what have selects direct current generator as electric dynamometer.Electric DC dynamometer has the advantages such as control structure is simple, speed governing is level and smooth, is to apply more a kind of electric dynamometer.Described Motor Measuring System mainly comprises: direct current generator, control circuit, measurement mechanism and energy absorbing device four parts.When this test macro work, treat that measured motor is as prime mover, for direct current generator provides driving torque, the electrical parameter that the electric energy that direct current generator sends is treated measured motor by measurement mechanism is measured, and by energy absorbing device, energy is consumed afterwards.Meanwhile, the dynamometry unit of measurement mechanism is installed on direct-current motor shell, treats the torque of measured motor by the suffered torque of DC motor stator and measure.Described Motor Measuring System, each ingredient is all furnished with standardized interface functionality circuitry, all be connected with unified system bus, this feature has determined that Auto-Test System can realize system constructing and reconstruction more flexibly, and each functional unit of composition system all has very strong versatility.For different test assignments, only need to change different instrument and equipments, use a controller to realize the control of some different test assignments is carried out and become a reality.
Above-mentioned Motor Measuring System, although realize certain robotization, for electromechanical testing has improved efficiency,, for different test assignments, still need to change different instrument and equipments.Test cannot realize real robotization, and testing efficiency urgently further improves.
Summary of the invention
The invention provides a kind of Motor Measuring System, with solving the defect that needs to change different instrument and equipments in different test assignments, realize the robotization of Motor Measuring System, improve testing efficiency.
The invention provides a kind of Motor Measuring System, wherein, comprising:
Load testing circuit, is connected to three-phase alternating-current supply and treats between measured motor, and described load testing circuit comprises the first switch, for conducting or the disconnection of control load measurement circuit;
Zero load/stall measurement circuit, is connected to three-phase alternating-current supply and treats between measured motor, and described zero load/stall measurement circuit comprises second switch, for controlling conducting or the disconnection of zero load/stall measurement circuit;
Controller, for generation of load control signal and zero load/stall control signal, offers respectively the first switch and second switch, to control the closed of the first switch and second switch or to disconnect;
Test component, comprises electrical quantity acquisition elements and speed probe, and described electrical quantity acquisition elements is arranged in zero load/stall measurement circuit and load testing circuit, and described speed probe is arranged on treats measured motor place, for gathering the rotating speed for the treatment of measured motor.
The embodiment of the present invention provides a kind of Motor Measuring System, select conducting and the disconnection of load testing circuit and zero load/stall measurement circuit by controller, realize the selection of test event, again by test component collecting test data, complete the automation mechanized operation of Motor Measuring System, solve the problem that needs to change different instrument and equipments in different test assignments, improved the efficiency of electromechanical testing.
Accompanying drawing explanation
The basic structure schematic diagram of the Motor Measuring System that Fig. 1 provides for the embodiment of the present invention one;
The structural representation of load testing circuit in the Motor Measuring System that Fig. 2 provides for the embodiment of the present invention two;
The structural representation of zero load/stall measurement circuit in the Motor Measuring System that Fig. 3 provides for the embodiment of the present invention three;
The mechanism map of the Motor Measuring System that Fig. 4 provides for the embodiment of the present invention four;
The power-supply device schematic diagram of the Motor Measuring System that Fig. 5 provides for the embodiment of the present invention four.
Embodiment
Embodiment mono-
Figure 1 shows that the basic structure schematic diagram of the Motor Measuring System that the embodiment of the present invention one provides, the present embodiment is applicable in electromechanical testing process, and when conversion test assignment, without the situation of changing instrument and equipment, the concrete structure of this Motor Measuring System is as follows:
Motor Measuring System 10 comprises load testing circuit 11, zero load/stall measurement circuit 12, controller 13 and test component 14.
Wherein, load testing circuit 11 is connected to three-phase alternating-current supply 15 and treats between measured motor 111, and described load testing circuit 11 comprises the first switch 16, for conducting or the disconnection of control load measurement circuit 11;
Zero load/stall measurement circuit 12 is similar with load testing circuit 11, also be connected to three-phase alternating-current supply 15 and treat between measured motor 111, and described zero load/stall measurement circuit 12 comprises second switch 17, for controlling conducting or the disconnection of zero load/stall measurement circuit 12;
Controller 13 is connected with load testing circuit 11 and zero load/stall measurement circuit 12 respectively, for generation of load control signal and zero load/stall control signal, offer respectively the first switch 16 and second switch 17, to control the closed of the first switch 16 and second switch 17 or to disconnect;
Test component 14, comprises electrical quantity acquisition elements 18 and speed probe 19; Described electrical quantity acquisition elements 18, is arranged in zero load/stall measurement circuit 12 and load testing circuit 11, is used for gathering all kinds of electrical simulations amount parameters.Wherein, described test component 14 comprises current sensor, voltage sensor and power sensor, but not as limit; Described speed probe 19 is arranged on treats measured motor 111 places, for gathering the rotating speed for the treatment of measured motor 111.
Described in the present embodiment, the course of work of Motor Measuring System 10 is: will treat that measured motor 111 is connected to Motor Measuring System 10, by controller 13 according to user test requirement, produce load control signal or zero load/stall control signal, control the closed of the first switch 16 and second switch 17 or disconnect.For example, user requires to carry out motor load test, produces load control signal by controller 13, controls the first switch 16 closures, and second switch 17 disconnects, and makes 11 conductings of load testing circuit, and three-phase alternating-current supply 15 is access in.After measured motor 111 connects electricity work, electrical quantity acquisition elements 18 from operation treat measured motor 111, gather electrical simulations amount parameter, as electric current, voltage, power etc., these electrical quantitys are carried out spreading out of from its output terminal after modulus (A/D) conversion, for post-processed.Speed probe 19 receives the rotary speed parameter for the treatment of measured motor 111 simultaneously, by its output terminal outgoi8ng data, for post-processed.After data acquisition, if user requires to treat measured motor 111 and does the test of zero load/stall, produce zero load/stall control signal by controller 13 equally, controlling the first switch 16 disconnects, second switch 17 closures, make 12 conductings of zero load/stall measurement circuit, data acquisition is afterwards consistent with above-mentioned gatherer process, repeats no more herein.
The technical scheme of the present embodiment, produce load control signal and zero load/stall control signal by controller, realize conducting and the disconnection of load testing circuit and zero load/stall measurement circuit, solve the defect problem that needs to change different instrument and equipments in different test assignments, realized the raising of testing efficiency.
Embodiment bis-
The structural representation of load testing circuit in the Motor Measuring System that Fig. 2 provides for the embodiment of the present invention two, the present embodiment, on the basis of embodiment mono-, has also increased load motor 27.Load motor also can be set in test macro, and other loads are additionally provided, consume the rotational energy for the treatment of measured motor 111.
In the present embodiment, load testing circuit 11 specifically comprises reactance filter unit 21, rectification unit 22, DC filtering unit 23 and inversion unit 24, can realize the conversion to three-phase alternating current, drives and treats that measured motor 111 rotates to export suitable drive current.
Wherein, load motor 27 treats that with described measured motor 111 is connected by shaft coupling 28, and its output terminal is connected with the inversion unit 24 in load testing circuit 11.In load testing circuit 11, the first switch 16, reactance filter unit 21, rectification unit 22, DC filtering unit 23 and inversion unit 24 are connected in turn.
The present embodiment further, in order to reduce the energy dissipation of Motor Measuring System 10, has also configured energy feedback mechanism.Be that described inversion unit 24 comprises the first inversion unit 25 and the second inversion unit 26, wherein, the first inversion unit 25 is connected with described DC filtering unit 23 respectively with the second inversion unit 26, the first inversion unit 25 treats that with described measured motor 111 is connected, and the second inversion unit 26 is connected with the electric weight output terminal of described load motor 27.
Described in the present embodiment, the course of work of load testing circuit 11 is: to described in the time that measured motor 111 carries out load testing, produce load control signal control the first switch 16 closures by controller 13, three-phase alternating-current supply 15 is access in load testing circuit 11, carry out filtering processing by reactance filter unit 21 successively, rectification unit 22 carries out direct current conversion, DC filtering unit 23 carries out DC filtering processing, access after the first inversion unit 25 inversions processing, treat that to described measured motor 111 powers, drive its rotation.Load motor 27 treats that with described measured motor 111 is connected by shaft coupling 28, by treating that measured motor 111 drives its operation, load motor 27 is operated in generating state, the alternating current producing reaches the second inversion unit 26 by the electric weight output terminal of load motor 27, after inversion, be converted to direct current and transfer to the first inversion unit 25, treat that measured motor 111 powers, forming energy feedback for described.
Simultaneously, electrical quantity acquisition elements 18 can be arranged on the circuit between load motor 27 and the second inversion unit 26, for gathering electrical simulations amount parameter, as electric current, voltage, power etc., these electrical simulations amount parameters are carried out spreading out of from its output terminal after A/D conversion, for post-processed.Wherein, described electrical quantity acquisition elements 18 comprises current sensor, voltage sensor and power sensor, but not as limit; Described in being arranged on, treats by speed probe 19 measured motor 111 places, for gathering the rotary speed parameter for the treatment of measured motor 111, by its output terminal outgoi8ng data, for post-processed.
The technical scheme of the present embodiment, by increasing load motor, reactance filter unit, rectification unit, DC filtering unit and the first inversion unit and the second inversion unit, having solved existing Motor Measuring System does not have the problem of energy back feed device, realize recycling of energy, greatly saved the energy.
On the basis of technique scheme, load motor 27 can be preferably an alternating current generator.The benefit arranging is like this, alternating current generator does not structurally exist commutator and brush, can overcome the inherent defect that direct current generator cannot overcome, as difficult in maintenance, the life-span is shorter, high expensive etc.
Embodiment tri-
The structural representation of zero load/stall measurement circuit in the Motor Measuring System that Fig. 3 provides for the embodiment of the present invention three, the present embodiment is on the basis of above-described embodiment, and preferably zero load/stall measurement circuit 12 specifically comprises rotating control module 31 and three phase voltage regulating unit 32.
Wherein, second switch 17, rotating control module 31 and three phase voltage regulating unit 32 are connected in turn; Described three phase voltage regulating unit 32 treats that with described measured motor 111 is connected;
Described rotating control module 31 is connected with described controller 13, produces rotating control signal control rotating control module 31 carry out rotating switching action by described controller 13.
Described in the present embodiment, the course of work of zero load/stall measurement circuit 12 is: to described in the time that measured motor 111 carries out zero load/stall test, produce load control signal control second switch 17 closures by described controller 13, three-phase alternating-current supply 15 is access in zero load/stall measurement circuit 12, pass through successively rotating control module 31, by three phase voltage regulating unit 32, the three-phase alternating current of access is carried out after pressure regulation processing again, treat that to described measured motor 111 powers.Simultaneously, it is described after measured motor 111 is bringing into operation, controller 13 is controlled rotating control module 31 and is carried out rotating switching action, be arranged at three phase voltage regulating unit 32 and described in treat that electrical quantity acquisition elements between measured motor 111 18 treats the electrical simulations amount parameter of measured motor 111 described in gathering, as electric current, voltage, power etc., these electrical simulations amount parameters are carried out spreading out of from its output terminal after A/D conversion, for post-processed.Wherein, described electrical quantity acquisition elements 18 comprises current sensor, voltage sensor and power sensor, but not as limit; Described in gathering, treats by the speed probe 19 for the treatment of measured motor 111 places described in being arranged at the rotary speed parameter of measured motor 111, by its output terminal outgoi8ng data, for post-processed.
The technical scheme of the present embodiment, by rotating control module, three phase voltage regulating unit, realizes described automation mechanized operation in the time that measured motor carries out the test of zero load/stall, has improved testing efficiency.
Embodiment tetra-
The mechanism map of the Motor Measuring System that Fig. 4 provides for the embodiment of the present invention four, the present embodiment, on the basis of above-described embodiment, is preferably further optimized for host computer 41 and slave computer 42 by described controller 13.Load testing circuit 11 is preferably and comprises a frequency converter 44 simultaneously, possesses reactance filter unit 21, rectification unit 22, DC filtering unit 23 and inversion unit 24, also has the function of electrical quantity acquisition elements 18 concurrently, directly gathers electrical quantity.Described the first switch 16, second switch 17 are preferably to the first gauge tap 45, the second gauge tap 46 and the 3rd gauge tap 47.
Wherein, described controller 13 comprises host computer 41 and slave computer 42, and described host computer 41 can be a computing machine, as shown in this embodiment, but is not limited to this.Described host computer 41 is connected with frequency converter 44 with slave computer 42 by system bus 48, realize Motor Measuring System 10 to the control of slave computer 42 and frequency converter 44 with and the configuration of communication mode and the setting of control parameter.Described slave computer 42 is a programmable logic controller (PLC) (PLC), be connected with host computer 41 by system bus 48, for receiving steering order that host computer 41 sends and to host computer 41 test transmission result parameters, slave computer 42 and electrical quantity acquisition elements 18 simultaneously, speed probe 19, the first gauge tap 45, the second gauge tap 46 is connected with the 3rd gauge tap 47, be used for controlling the first gauge tap 45, the second gauge tap 46 and the 3rd gauge tap 47 are switched to corresponding measurement circuit, control electrical quantity acquisition elements 18 and speed probe 19 gather and transmit described in treat electrical quantity and the rotary speed parameter of measured motor 111, return to host computer 41.
Described frequency converter 44 can specifically comprise control module, inlet wire interface module, active power module and power module, and each module is connected in turn.Wherein, control module is responsible for controlling and coordinating all modules in whole frequency converter 44, and controls between each module and can carry out the exchange of data; Inlet wire interface module is carried out filtering processing to three-phase alternating current; The alternating current of active electric power source pair of module after by inlet wire interface modules handle carries out rectification and direct current that power module is produced carries out energy feedback; Power module is made up of the first power module and second source module, the first electric power source pair of module carries out inversion processing by active power module direct current after treatment, produce alternating current and treat that to described measured motor 111 powers, second source module is carried out inversion processing to the alternating current being produced by described load motor 27, produce direct current and feed back to the first power module after active power module is processed, treat that to described measured motor 111 powers.
Described the first gauge tap 45, the second gauge tap 46 and the 3rd gauge tap 47, be arranged in load testing circuit 11 and zero load/stall measurement circuit 12.Wherein, described the first gauge tap 45 can comprise multiple switch modules, be connected with three-phase alternating-current supply 15, slave computer 42, three phase voltage regulating unit 32 and frequency converter 44 respectively, unified work under the control of load testing signal, is used for realizing conversion and the rotating switching action of load testing circuit 11 and zero load/stall measurement circuit 12; Described the second gauge tap 46 can comprise multiple switch modules, respectively with described slave computer 42, treat that measured motor 111, frequency converter 44 and electrical quantity acquisition elements 18 are connected, unified work under the control of zero load/stall test signal, be used for equally realizing the conversion of load testing circuit 11 and zero load/stall measurement circuit 12, realize the bilayer control of line transfer.Wherein, described the first gauge tap 45, the second gauge tap 46 and the 3rd gauge tap 47, can be relay, contactor group, but not as limit.(wherein the part unit of frequency converter 44 is not shown) as shown in Figure 5, the first gauge tap 45 specifically comprises K switch 1, K switch 3, K switch 4 and K switch 5, the second gauge tap 46 specifically comprises that K switch 6 and K switch 7, the three gauge tap 47 specifically comprise K8.
Described in the present embodiment, the course of work of Motor Measuring System 10 is: host computer 41 receives user instruction, offer slave computer 42 by system bus 48, slave computer 42 produces control signal according to user instruction, be sent to the first gauge tap 45, the second gauge tap 46 and the 3rd gauge tap 47, control its closed or disconnection, thereby realize conducting and the disconnection of load testing circuit 11 and zero load/stall measurement circuit 12.
If user requires to carry out load testing, the first gauge tap 45 receives steering order Closing Switch K1 and K switch 5 is communicated with three-phase alternating-current supply 15 and frequency converter 44, the second gauge tap 46 Closing Switch K7 by frequency converter 44 with described in treat that measured motor 111 is communicated with, slave computer 42 produces control signal according to user instruction, be sent to the 3rd gauge tap 47 Closing Switch K8 load motor 27 is communicated with the second source module of frequency converter 44, realize the conducting of load testing circuit 11.Three-phase current treats that to stating measured motor 111 powers after the inlet wire interface module in frequency converter 44, active power module and the first power module are processed, after measured motor 111 operations, drive load motor 27 to turn round by shaft coupling 28, after load motor 27 runnings, produce alternating current and transfer to second source module, after processing, the inversion of second source module forms direct current, the direct current producing feeds back to the first power module after active power module is processed, treat that to described measured motor 111 powers, realize energy feedback.Meanwhile, the control module in frequency converter 44 extracts the electrical quantity for the treatment of measured motor 111 from the first power module and second source module, transfers to host computer 41 carry out data post-processed by system bus 48; Described in gathering, treats by the speed probe 19 for the treatment of measured motor 111 places described in being arranged at the rotary speed parameter of measured motor 111, by its output terminal outgoi8ng data to slave computer 42, slave computer 42 is processed after receiving rotary speed parameter, and data result after treatment is sent to host computer 41 by system bus 48.
If when user requires to carry out the test of zero load/stall, the first gauge tap 45 receives steering order Closing Switch K1 and K switch 3/K4 is communicated with three-phase alternating-current supply 15 and three phase voltage regulating unit 32, the second gauge tap 46 Closing Switch K6 and K7 by three phase voltage regulating unit 32 with described in treat that measured motor 111 is communicated with, realize the conducting of zero load/stall measurement circuit 12.Three-phase current electricity treats that to stating measured motor 111 powers after the pressure regulation of three phase voltage regulating unit 32 is processed, treat that measured motor 111 moves in zero load/stall situation, the first gauge tap 45 receives steering order Closing Switch K4/K3 and controls motor positive and inverse action, be arranged at three phase voltage regulating unit 32 and the electrical simulations amount parameter for the treatment of measured motor 111 described in electrical quantity acquisition elements 18 collections for the treatment of on measured motor 111 circuits, as electric current, voltage, power etc., these electrical simulations amount parameters are carried out being sent to slave computer 42 from its output terminal after A/D conversion, slave computer 42 is processed after receiving these electrical quantitys, data result after treatment is sent to host computer 41 by system bus 48.Wherein, described electrical quantity acquisition elements 18 comprises current sensor, voltage sensor and power sensor, but not as limit; Described in gathering, treats by the speed probe 19 for the treatment of measured motor 111 places described in being arranged at the rotary speed parameter of measured motor 111, by its output terminal outgoi8ng data, be sent to slave computer 42, slave computer 42 is processed after receiving rotary speed parameter, and data result after treatment is sent to host computer 41 by system bus 48.
The technical scheme of the present embodiment, by being host computer and slave computer by described controller optimization, has realized the data acquisition of Motor Measuring System and the robotization of processing;
By the reactance filter unit in load testing circuit, rectification unit, DC filtering unit and inversion unit, together with the function that is arranged at electrical quantity acquisition elements in load testing circuit and is preferably a frequency converter, has realized energy feedback and electrical quantity and be collected in one, improve integrated level, saved the distribution time;
Described the first switch, second switch are preferably to the first gauge tap, the second gauge tap and the 3rd gauge tap, improve the controlled of Motor Measuring System, in case of emergency can disconnect in time and treat measured motor and load motor, reach emergent safe effect.
On the basis of technique scheme, described system bus 48 can be preferably Profibus-DP bus, and the benefit of described Profibus-DP bus is, Profibus-DP communication mode, have high data rate, transferring large number of data simultaneously, realizes the real-time control to motor.
On the basis of technique scheme, Motor Measuring System 10 can also comprise a direct supply, as shown in Figures 4 and 5, can be a 24V direct supply 43, but not as limit.As shown in Figure 5, described 24V direct supply 43 can obtain 24V direct current by three-phase alternating-current supply 15, and K switch 2 is controlled conducting and the disconnection of described 24V direct supply 43.The benefit of described 24V direct supply 43 is, described 24V direct supply 43 can be directly for slave computer 42, frequency converter 44 and test component 14 be powered, as shown in Figure 4, described 24V direct supply 43 is connected with slave computer 42, frequency converter 44, Fig. 4 is not shown to be connected with test component 14, but not as limit.
Finally it should be noted that: above each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.

Claims (9)

1. a Motor Measuring System, is characterized in that, comprising:
Load testing circuit, is connected to three-phase alternating-current supply and treats between measured motor, and described load testing circuit comprises the first switch, for conducting or the disconnection of control load measurement circuit;
Zero load/stall measurement circuit, is connected to three-phase alternating-current supply and treats between measured motor, and described zero load/stall measurement circuit comprises second switch, for controlling conducting or the disconnection of zero load/stall measurement circuit;
Controller, for generation of load control signal and zero load/stall control signal, offers respectively the first switch and second switch, to control the closed of the first switch and second switch or to disconnect;
Test component, comprises electrical quantity acquisition elements and speed probe, and described electrical quantity acquisition elements is arranged in zero load/stall measurement circuit and load testing circuit, and described speed probe is arranged on treats measured motor place, for gathering the rotating speed for the treatment of measured motor.
2. Motor Measuring System according to claim 1, is characterized in that, also comprises:
Load motor, treats that with described measured motor is connected by shaft coupling.
3. Motor Measuring System according to claim 2, is characterized in that, described load motor is an alternating current generator.
4. Motor Measuring System according to claim 2, is characterized in that, described load testing circuit comprises: the first switch, reactance filter unit, rectification unit, DC filtering unit and the inversion unit that are connected in turn.
5. Motor Measuring System according to claim 4, is characterized in that: described inversion unit comprises the first inversion unit and the second inversion unit, and described the first inversion unit is connected with described DC filtering unit respectively with the second inversion unit; Described the first inversion unit treats that with described measured motor is connected, and described the second inversion unit is connected with the electric weight output terminal of described load motor.
6. Motor Measuring System according to claim 1, it is characterized in that, described zero load/stall measurement circuit comprises: connected second switch, rotating control module and three phase voltage regulating unit in turn, described controller, also for generation of rotating control signal, is controlled described rotating control module and is carried out rotating switching action.
7. Motor Measuring System according to claim 1, it is characterized in that: described controller comprises host computer and slave computer, described host computer is used for receiving user instruction and offers slave computer, described slave computer is programmable logic controller (PLC), for producing described control signal according to user instruction, and the data of returning for receiving described test component collection, return to described host computer.
8. Motor Measuring System according to claim 7, is characterized in that, described load testing circuit comprises a frequency converter, and its electrical quantity as the collection of electrical quantity acquisition elements is sent to this host computer by system bus.
9. Motor Measuring System according to claim 8, is characterized in that, also comprises:
One direct supply is described slave computer, frequency converter and test component power supply.
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