CN105467316A - Voltage-stabilization-type test rotating speed automation adjusting type motor test system based on band-pass filtering - Google Patents
Voltage-stabilization-type test rotating speed automation adjusting type motor test system based on band-pass filtering Download PDFInfo
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- CN105467316A CN105467316A CN201510819731.3A CN201510819731A CN105467316A CN 105467316 A CN105467316 A CN 105467316A CN 201510819731 A CN201510819731 A CN 201510819731A CN 105467316 A CN105467316 A CN 105467316A
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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
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Abstract
The invention discloses a voltage-stabilization-type test rotating speed automation adjusting type motor test system based on band-pass filtering. The system is characterized in that the system is formed by a single chip microcomputer, a variable frequency motor control unit connected to the single chip microcomputer, an output display unit, an operation unit, a band-pass filtering unit, a rotating speed signal acquisition unit connected to the band-pass filtering unit, a tested motor connected to the rotating speed signal acquisition unit, a variable frequency motor connected to the tested motor and a voltage-stabilized power supply module connected to the variable frequency motor; and the variable frequency motor is also connected to a variable frequency motor control unit. In the invention, the band-pass filtering unit is arranged and can be used to filter an interference signal doped into a rotating speed signal so that an influence of the interference signal on the rotating speed signal is avoided and a test result of the tested motor is not influenced.
Description
Technical field
The present invention relates to a kind of Motor Measuring System, specifically refer to a kind of type voltage regulation based on bandpass filtering test rotating speed automatic adjustment Motor Measuring System.
Background technology
Along with national economy and scientific and technical development, the effect that motor plays in all trades and professions is more and more important.Meanwhile, along with the development of every profession and trade, propose more and more higher requirement to motor product, therefore motor product all needs to verify whether its characteristic reaches application requirement by some pilot projects before dispatching from the factory.Motor Measuring Technology has considerable meaning for the performance verification of motor.But traditional Motor Measuring System is easily subject to the impact of system operating voltage fluctuation when testing motor, cause cannot steadily being operated normally by measured motor, this just affects the assessment of tester to tested motor performance.
Summary of the invention
The object of the invention is to overcome traditional Motor Measuring System is easily subject to system operating voltage fluctuation impact when testing motor, cause the defect that cannot steadily be operated normally by measured motor, provide a kind of type voltage regulation based on bandpass filtering to test rotating speed automatic adjustment Motor Measuring System.
Object of the present invention is achieved through the following technical solutions: based on the type voltage regulation test rotating speed automatic adjustment Motor Measuring System of bandpass filtering, by single-chip microcomputer, the variable-frequency motor control module be connected with single-chip microcomputer, output display unit, operating unit and bandpass filtering unit, the tach signal collecting unit be connected with bandpass filtering unit, be connected with tach signal collecting unit by measured motor, the variable-frequency motor be connected with by measured motor, the power module of voltage regulation be connected with variable-frequency motor forms, described variable-frequency motor is also connected with variable-frequency motor control module, described power module of voltage regulation is by transformer T, diode rectifier U, three terminal regulator U1, triode VT4, triode VT5, positive pole is connected with the cathode output end of diode rectifier U, the electric capacity C2 that negative pole is then connected with the cathode output end of diode rectifier U, the electric capacity C3 be in parallel with electric capacity C2, be serially connected in the diode D3 between the IN pin of three terminal regulator U1 and OUT pin, P pole is connected with the GND pin of three terminal regulator U1 after electric capacity C4, the diode D4 that N pole is then connected with the cathode output end of diode rectifier U, one end is connected with the emitter of triode VT4, the resistance R8 that the other end is then connected with the N pole of diode D4, be serially connected in the electric capacity C5 between the collector of triode VT4 and the base stage of triode VT5, one end is connected with the base stage of triode VT5, the potentiometer R9 that the other end is then extremely connected with the N of diode D4, and N pole is connected with the collector of triode VT5, the diode D5 that P pole is then connected with the N pole of diode D4 forms, an input end of described diode rectifier U is connected with the non-same polarity of the secondary inductance coil of transformer T, its another input end is then connected with the Same Name of Ends of the secondary inductance coil of transformer T, the non-same polarity of the former limit telefault of described transformer T and Same Name of Ends form the input end of this power module of voltage regulation jointly, the base stage of described triode VT4 is then connected with the P pole of diode D4, form the output terminal of this power module of voltage regulation while the IN pin of described three terminal regulator U1 is connected with the cathode output end of diode rectifier U, its OUT pin is then connected with the emitter of triode VT5 together with the P pole of diode D5, the output terminal of this power module of voltage regulation is connected with variable-frequency motor.
Described bandpass filtering unit is by amplifier P2, amplifier P3, triode VT6, negative pole is connected with the positive pole of amplifier P2 after electric capacity C7, positive pole then forms the electric capacity C6 of the input end of this bandpass filtering unit, one end is connected with the positive pole of amplifier P2, the resistance R11 of ground connection while the other end is then connected with the base stage of triode VT6, one end is connected with the negative pole of electric capacity C6, the resistance R9 that the other end is then connected with the output terminal of amplifier P2, be serially connected in the resistance R10 between the output terminal of amplifier P2 and the positive pole of amplifier P3, be serially connected in the electric capacity C11 between the positive pole of amplifier P3 and output terminal, positive pole is connected with the positive pole of amplifier P3, the electric capacity C10 of minus earth, positive pole is connected with the positive pole of amplifier P2, the electric capacity C8 of minus earth, and form with the polar capacitor C9 that electric capacity C8 is in parallel, the positive pole of described amplifier P2 connects 5V voltage, its output terminal is then all connected with the emitter of triode VT6 with negative pole, the grounded collector of described triode VT6, the output terminal of described amplifier P3 then formed this bandpass filtering unit output terminal its be connected with single-chip microcomputer, the input end of described bandpass filtering unit is then connected with the output terminal of tach signal collecting unit.
Further, described tach signal collecting unit by being arranged on by the speed probe in the rotating shaft of measured motor, the Acquisition Circuit be connected with speed probe, and the constant-current source circuit be connected with Acquisition Circuit forms; Described Acquisition Circuit is also connected with single-chip microcomputer.
Described Acquisition Circuit is by triode VT1, amplifier P1, positive pole is ground connection after voltage stabilizing diode D2, the electric capacity C1 of minus earth, P pole is connected with the output terminal of speed probe, N pole is then in turn through diode D1 that resistance R2 is connected with the negative pole of electric capacity C1 after resistance R3, one end is connected with the base stage of triode VT1, the resistance R1 that the other end is then connected with the P pole of diode D1, be serially connected in the resistance R7 between the positive pole of amplifier P1 and output terminal, and forward end is connected with the output terminal of amplifier P1, the polarity-inverting amplifier P2 that backward end then forms the output terminal of this tach signal collecting unit forms, while the base stage of described triode VT1 is connected with the positive pole of electric capacity C1, its emitter is then connected with the positive pole of amplifier P1, ground connection, its collector are then connected with the negative pole of amplifier P1, the output terminal of described tach signal collecting unit is connected with bandpass filtering unit.
Described constant-current source circuit by triode VT2, triode VT3, and the resistance R4 that one end is connected with the base stage of triode VT2, the other end is then connected with the emitter of triode VT2 after resistance R6 through resistance R5 in turn forms; The base stage of described triode VT2 is connected with the collector of triode VT3, its collector is then connected with the negative pole of amplifier P1, its emitter is then connected with the emitter of triode VT3; The base stage of described triode VT3 is then connected with the tie point of resistance R3 with resistance R2; The tie point of described resistance R4 and resistance R5 connects 5V voltage.
Described triode VT1, triode VT2 and triode VT3 all adopt NPN type triode.
Described three terminal regulator U1 is LM317 integrated chip.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
(1) the present invention can adjust by the rotating speed of measured motor fast in test process, to test by the parameter of measured motor under different rotating speeds, improves the efficiency of electromechanical testing.
(2) speed probe of the present invention is highly sensitive, can collect the very first time by the real-time rotate speed signal of measured motor, avoid signal to incur loss through delay and bring impact to test result.
(3) the present invention can give variable-frequency motor and be provided stable operating voltage by measured motor, makes it work stably, is convenient to the assessment of tester to tested motor performance.
(4) the present invention is provided with bandpass filtering unit, and it can filter the undesired signal be entrained in tach signal, avoids interference signal and impacts tach signal, thus impact is by the test result of measured motor.
Accompanying drawing explanation
Fig. 1 is one-piece construction block diagram of the present invention.
Fig. 2 is the circuit structure diagram of tach signal collecting unit of the present invention.
Fig. 3 is the circuit structure diagram of power module of voltage regulation of the present invention.
Fig. 4 is the circuit structure diagram of bandpass filtering unit of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, type voltage regulation based on bandpass filtering test rotating speed automatic adjustment Motor Measuring System of the present invention, by single-chip microcomputer, the bandpass filtering unit be connected with single-chip microcomputer respectively, variable-frequency motor control module, output display unit and operating unit, the tach signal collecting unit be connected with bandpass filtering unit, be connected with tach signal collecting unit by measured motor, the variable-frequency motor be connected with by measured motor, and the power module of voltage regulation be connected with variable-frequency motor forms; Described variable-frequency motor is also connected with variable-frequency motor control module.
Wherein, power module of voltage regulation is used for providing stable operating voltage to variable-frequency motor and by measured motor, and variable-frequency motor is then for driving tested electric machine rotation.The instruction of variable-frequency motor control module then for sending according to single-chip microcomputer controls variable-frequency motor, controls by the rotating speed of measured motor to reach.Tach signal collecting unit is then for gathering by the real-time rotate speed signal of measured motor.Bandpass filtering unit then can filter the undesired signal be entrained in tach signal, avoids interference signal and impacts tach signal, thus impact is by the test result of measured motor.Output display unit is used for showing intuitively by the real-time rotate speed of measured motor, and tester can assess by the performance of measured motor according to by the real-time rotate speed of measured motor, and this output display unit can adopt traditional display to realize.Operating unit is as human-computer exchange window, and tester can by it to single-chip microcomputer input control parameter.Single-chip microcomputer is then as control center of the present invention, it is analyzed for the controling parameters inputted tester, and sending steering order to variable-frequency motor control module, its tach signal that can also collect tach signal collecting unit is analyzed and exports to output display unit simultaneously.
As shown in Figure 2, it is by speed probe for the structure of this tach signal collecting unit, the Acquisition Circuit be connected with speed probe, and the constant-current source circuit be connected with Acquisition Circuit forms.
Described Acquisition Circuit is by triode VT1, and amplifier P1, resistance R1, resistance R2, resistance R3, resistance R7, polarity-inverting amplifier P2, electric capacity C1, diode D1 and voltage stabilizing diode D2 form.Constant-current source circuit is then by triode VT2, and triode VT3, resistance R4, resistance R5 and resistance R6 form.
Wherein, one end of resistance R4 is connected with the base stage of triode VT2, its other end is then connected with the emitter of triode VT2 after resistance R6 through resistance R5 in turn.The base stage of described triode VT2 is connected with the collector of triode VT3, its collector is then connected with the negative pole of amplifier P1, its emitter is then connected with the emitter of triode VT3.The tie point of described resistance R4 and resistance R5 connects 5V voltage, provides operating voltage for giving tach signal collecting unit.
In addition, positive pole ground connection, its minus earth after voltage stabilizing diode D2 of electric capacity C1, the P pole of diode D1 is connected with the output terminal of speed probe, its N pole is then connected with the negative pole of electric capacity C1 after resistance R3 through resistance R2 in turn, and the base stage of described triode VT3 is then connected with the tie point of resistance R3 with resistance R2.One end of resistance R1 is connected with the base stage of triode VT1, its other end is then connected with the P pole of diode D1, between the positive pole that resistance R7 is then serially connected in amplifier P1 and output terminal, the output terminal that the forward end of polarity-inverting amplifier P2 is connected with the output terminal of amplifier P1, its backward end then forms this tach signal collecting unit its be connected with the input end of bandpass filtering unit.While the base stage of described triode VT1 is connected with the positive pole of electric capacity C1, its emitter is then connected with the positive pole of amplifier P1, ground connection, its collector are then connected with the negative pole of amplifier P1.In order to reach better implementation result, the RS-3102 type piezoelectric sensor for measuring rotational speed that this speed probe preferentially adopts Beijing Tuo Puruisheng observation and control technology company limited to produce realizes.Described triode VT1, triode VT2 and triode VT3 then all preferentially adopt NPN type triode to realize.
As shown in Figure 3, it is by transformer T, diode rectifier U, three terminal regulator U1, triode VT4 for the structure of described power module of voltage regulation, triode VT5, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, diode D3, diode D4, diode D5, resistance R8 and potentiometer R9 form.
During connection, the positive pole of electric capacity C2 is connected with the cathode output end of diode rectifier U, its negative pole is then connected with the cathode output end of diode rectifier U; This diode rectifier and electric capacity C2 form current rectifying and wave filtering circuit.Electric capacity C3 is then in parallel with electric capacity C2, diode D3 is serially connected between the IN pin of three terminal regulator U1 and OUT pin, the P pole of diode D4 is connected with the GND pin of three terminal regulator U1 after electric capacity C4, its N pole is then connected with the cathode output end of diode rectifier U, one end of resistance R8 is connected with the emitter of triode VT4, its other end is then connected with the N pole of diode D4, electric capacity C5 is serially connected between the collector of triode VT4 and the base stage of triode VT5, one end of potentiometer R9 is connected with the base stage of triode VT5, its other end is then extremely connected with the N of diode D4, the N pole of diode D5 is connected with the collector of triode VT5, its P pole is then connected with the N pole of diode D4.
An input end of described diode rectifier U is connected with the non-same polarity of the secondary inductance coil of transformer T, its another input end is then connected with the Same Name of Ends of the secondary inductance coil of transformer T.The non-same polarity of the former limit telefault of described transformer T and Same Name of Ends form the input end of this power module of voltage regulation jointly, and this input termination 220V civil power, 220V civil power exports 15V voltage after transformer T transformation.The base stage of described triode VT4 is then connected with the P pole of diode D4.Form the output terminal of this power module of voltage regulation while the IN pin of described three terminal regulator U1 is connected with the cathode output end of diode rectifier U, its OUT pin is then connected with the emitter of triode VT5 together with the P pole of diode D5, this output terminal is connected with variable-frequency motor.In order to reach better implementation result, this three terminal regulator U1 is preferably LM317 integrated chip to realize.
As shown in Figure 4, this bandpass filtering unit is by amplifier P2, and amplifier P3, triode VT6, resistance R9, resistance R10, resistance R11, electric capacity C6, electric capacity C7, electric capacity C8, polar capacitor C9, electric capacity C10 and electric capacity C11 form.
During connection, the negative pole of electric capacity C6 is connected with the positive pole of amplifier P2 after electric capacity C7, its positive pole then forms the input end of this bandpass filtering unit, one end of resistance R11 is connected with the positive pole of amplifier P2, ground connection while its other end is then connected with the base stage of triode VT6, one end of resistance R9 is connected with the negative pole of electric capacity C6, its other end is then connected with the output terminal of amplifier P2, resistance R10 is then serially connected between the output terminal of amplifier P2 and the positive pole of amplifier P3, between the positive pole that electric capacity C11 is serially connected in amplifier P3 and output terminal, the positive pole of electric capacity C10 is connected with the positive pole of amplifier P3, its minus earth, the positive pole of electric capacity C8 is connected with the positive pole of amplifier P2, its minus earth, polar capacitor C9 is then in parallel with electric capacity C8.The positive pole of described amplifier P2 connects 5V voltage, and it is powered for giving this bandpass filtering unit, and the output terminal of this amplifier P2 is then all connected with the emitter of triode VT6 with negative pole.The grounded collector of described triode VT6; The output terminal of described amplifier P3 then formed this bandpass filtering unit output terminal its be connected with single-chip microcomputer.
As mentioned above, just well the present invention can be implemented.
Claims (6)
1. based on the type voltage regulation test rotating speed automatic adjustment Motor Measuring System of bandpass filtering, it is characterized in that, by single-chip microcomputer, the variable-frequency motor control module be connected with single-chip microcomputer respectively, output display unit, operating unit and bandpass filtering unit, the tach signal collecting unit be connected with bandpass filtering unit, be connected with tach signal collecting unit by measured motor, the variable-frequency motor be connected with by measured motor, the power module of voltage regulation be connected with variable-frequency motor forms, described variable-frequency motor is also connected with variable-frequency motor control module, described power module of voltage regulation is by transformer T, diode rectifier U, three terminal regulator U1, triode VT4, triode VT5, positive pole is connected with the cathode output end of diode rectifier U, the electric capacity C2 that negative pole is then connected with the cathode output end of diode rectifier U, the electric capacity C3 be in parallel with electric capacity C2, be serially connected in the diode D3 between the IN pin of three terminal regulator U1 and OUT pin, P pole is connected with the GND pin of three terminal regulator U1 after electric capacity C4, the diode D4 that N pole is then connected with the cathode output end of diode rectifier U, one end is connected with the emitter of triode VT4, the resistance R8 that the other end is then connected with the N pole of diode D4, be serially connected in the electric capacity C5 between the collector of triode VT4 and the base stage of triode VT5, one end is connected with the base stage of triode VT5, the potentiometer R9 that the other end is then extremely connected with the N of diode D4, and N pole is connected with the collector of triode VT5, the diode D5 that P pole is then connected with the N pole of diode D4 forms, an input end of described diode rectifier U is connected with the non-same polarity of the secondary inductance coil of transformer T, its another input end is then connected with the Same Name of Ends of the secondary inductance coil of transformer T, the non-same polarity of the former limit telefault of described transformer T and Same Name of Ends form the input end of this power module of voltage regulation jointly, the base stage of described triode VT4 is then connected with the P pole of diode D4, form the output terminal of this power module of voltage regulation while the IN pin of described three terminal regulator U1 is connected with the cathode output end of diode rectifier U, its OUT pin is then connected with the emitter of triode VT5 together with the P pole of diode D5, the output terminal of this power module of voltage regulation is connected with variable-frequency motor,
Described bandpass filtering unit is by amplifier P2, amplifier P3, triode VT6, negative pole is connected with the positive pole of amplifier P2 after electric capacity C7, positive pole then forms the electric capacity C6 of the input end of this bandpass filtering unit, one end is connected with the positive pole of amplifier P2, the resistance R11 of ground connection while the other end is then connected with the base stage of triode VT6, one end is connected with the negative pole of electric capacity C6, the resistance R9 that the other end is then connected with the output terminal of amplifier P2, be serially connected in the resistance R10 between the output terminal of amplifier P2 and the positive pole of amplifier P3, be serially connected in the electric capacity C11 between the positive pole of amplifier P3 and output terminal, positive pole is connected with the positive pole of amplifier P3, the electric capacity C10 of minus earth, positive pole is connected with the positive pole of amplifier P2, the electric capacity C8 of minus earth, and form with the polar capacitor C9 that electric capacity C8 is in parallel, the positive pole of described amplifier P2 connects 5V voltage, its output terminal is then all connected with the emitter of triode VT6 with negative pole, the grounded collector of described triode VT6, the output terminal of described amplifier P3 then formed this bandpass filtering unit output terminal its be connected with single-chip microcomputer, the input end of described bandpass filtering unit is then connected with the output terminal of tach signal collecting unit.
2. the test of the type voltage regulation based on bandpass filtering rotating speed automatic adjustment Motor Measuring System according to claim 1, it is characterized in that: described tach signal collecting unit is by being arranged on by the speed probe in the rotating shaft of measured motor, the Acquisition Circuit be connected with speed probe, and the constant-current source circuit be connected with Acquisition Circuit forms; Described Acquisition Circuit is also connected with single-chip microcomputer.
3. the test of the type voltage regulation based on bandpass filtering rotating speed automatic adjustment Motor Measuring System according to claim 2, it is characterized in that: described Acquisition Circuit is by triode VT1, amplifier P1, positive pole is ground connection after voltage stabilizing diode D2, the electric capacity C1 of minus earth, P pole is connected with the output terminal of speed probe, N pole is then in turn through diode D1 that resistance R2 is connected with the negative pole of electric capacity C1 after resistance R3, one end is connected with the base stage of triode VT1, the resistance R1 that the other end is then connected with the P pole of diode D1, be serially connected in the resistance R7 between the positive pole of amplifier P1 and output terminal, and forward end is connected with the output terminal of amplifier P1, the polarity-inverting amplifier P2 that backward end then forms the output terminal of this tach signal collecting unit forms, while the base stage of described triode VT1 is connected with the positive pole of electric capacity C1, its emitter is then connected with the positive pole of amplifier P1, ground connection, its collector are then connected with the negative pole of amplifier P1, the output terminal of described tach signal collecting unit is connected with bandpass filtering unit.
4. the test of the type voltage regulation based on bandpass filtering rotating speed automatic adjustment Motor Measuring System according to claim 3, it is characterized in that: described constant-current source circuit is by triode VT2, triode VT3, and the resistance R4 that one end is connected with the base stage of triode VT2, the other end is then connected with the emitter of triode VT2 after resistance R6 through resistance R5 in turn forms; The base stage of described triode VT2 is connected with the collector of triode VT3, its collector is then connected with the negative pole of amplifier P1, its emitter is then connected with the emitter of triode VT3; The base stage of described triode VT3 is then connected with the tie point of resistance R3 with resistance R2; The tie point of described resistance R4 and resistance R5 connects 5V voltage.
5. the test of the type voltage regulation based on bandpass filtering rotating speed automatic adjustment Motor Measuring System according to claim 4, is characterized in that: described triode VT1, triode VT2 and triode VT3 all adopt NPN type triode.
6. the test of the type voltage regulation based on bandpass filtering rotating speed automatic adjustment Motor Measuring System according to claim 4, is characterized in that: described three terminal regulator U1 is LM317 integrated chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510819731.3A CN105467316A (en) | 2015-11-21 | 2015-11-21 | Voltage-stabilization-type test rotating speed automation adjusting type motor test system based on band-pass filtering |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510819731.3A CN105467316A (en) | 2015-11-21 | 2015-11-21 | Voltage-stabilization-type test rotating speed automation adjusting type motor test system based on band-pass filtering |
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| CN105467316A true CN105467316A (en) | 2016-04-06 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101388630A (en) * | 2008-10-25 | 2009-03-18 | 何伟斌 | Motor driver and control circuit board |
| CN201926921U (en) * | 2010-06-25 | 2011-08-10 | 深圳市远舟科技实业有限公司 | Test bench of ship host remote control system |
| CN104808146A (en) * | 2015-05-06 | 2015-07-29 | 成都诚邦动力测试仪器有限公司 | High-accuracy motor testing system |
| CN104880229A (en) * | 2015-04-13 | 2015-09-02 | 成都诚邦动力测试仪器有限公司 | Low-pass filtering based engine fuel consumption detection system |
| CN104953866A (en) * | 2014-11-27 | 2015-09-30 | 成都雷克尔科技有限公司 | Combined protective multiplexed output voltage-stabilized power source based on logic protection amplifying circuit |
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2015
- 2015-11-21 CN CN201510819731.3A patent/CN105467316A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101388630A (en) * | 2008-10-25 | 2009-03-18 | 何伟斌 | Motor driver and control circuit board |
| CN201926921U (en) * | 2010-06-25 | 2011-08-10 | 深圳市远舟科技实业有限公司 | Test bench of ship host remote control system |
| CN104953866A (en) * | 2014-11-27 | 2015-09-30 | 成都雷克尔科技有限公司 | Combined protective multiplexed output voltage-stabilized power source based on logic protection amplifying circuit |
| CN104880229A (en) * | 2015-04-13 | 2015-09-02 | 成都诚邦动力测试仪器有限公司 | Low-pass filtering based engine fuel consumption detection system |
| CN104808146A (en) * | 2015-05-06 | 2015-07-29 | 成都诚邦动力测试仪器有限公司 | High-accuracy motor testing system |
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