CN111458636A - High-speed permanent magnet motor loading device - Google Patents
High-speed permanent magnet motor loading device Download PDFInfo
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- CN111458636A CN111458636A CN202010259282.2A CN202010259282A CN111458636A CN 111458636 A CN111458636 A CN 111458636A CN 202010259282 A CN202010259282 A CN 202010259282A CN 111458636 A CN111458636 A CN 111458636A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
Abstract
The invention belongs to the technical field of power electronics, and relates to a double-voltage high-speed permanent magnet motor loading device with an energy feedback function. In particular to a high-speed permanent magnet motor loading device. The motor drive device under test includes: the test system comprises a test high-speed permanent magnet motor driving circuit with a rated voltage of 380V and a test high-speed permanent magnet motor driving circuit with a rated voltage of 660V. Compared with a motor loading device with a speed reducer matched with a common asynchronous motor and a four-quadrant motor driver, the mechanical energy transmission device has the advantages that the speed reducer is omitted, the mechanical energy transmission device is simple and efficient in structure, the accompanying motor is a high-speed permanent magnet synchronous motor and can generate electricity by being dragged and rotated by the tested motor, the complicated control of the four-quadrant motor driver is not needed, 380V/50Hz alternating current feedback circuit and 660V/50Hz alternating current feedback circuit can respectively realize 380V voltage energy feedback and 660V voltage energy feedback, and the feedback power is adjustable. The energy saving effect is superior to that of brake-type loads.
Description
Technical Field
The invention belongs to the technical field of power electronics, and relates to a double-voltage high-speed permanent magnet motor loading device with an energy feedback function. In particular to a high-speed permanent magnet motor loading device.
Background
In a high-speed permanent magnet motor type test, a loading device is indispensable. The loading device used in the high-speed permanent magnet motor type test generally comprises two types of loads, namely a brake type load and a motor type load. The brake loads mainly comprise an eddy current brake, a magnetic powder brake and a magnetic hysteresis brake. The load directly consumes the output power of the tested motor, does not have an energy feedback function, and has high energy consumption and poor economical efficiency after long-term use. A motor load system selects a low-speed asynchronous motor 2 to be indirectly connected with a rotating shaft of a tested high-speed permanent magnet motor 1 through a speed reducer 3, a special four-quadrant driver 4 is used for controlling the rotating speed of the asynchronous motor 2, mechanical work of the tested motor 1 is converted into electric energy of the asynchronous motor 2 to be fed back to a power grid, and a schematic block diagram is shown in figure 1. The motor load is applied to a tested high-speed permanent magnet motor, a high-reduction-ratio speed reducer and a four-quadrant driver are required to be matched, and the system is complex. And the larger the power of the tested motor is, the larger the difficulty in designing and manufacturing the speed reducer is, and the lower the reliability of the system is.
Disclosure of Invention
The invention provides a double-voltage high-speed permanent magnet motor loading device with an energy feedback function, aiming at the problems that the existing braking load has high energy consumption, a low-speed asynchronous motor load needs to be matched with a high-reduction-ratio speed reducer and a four-quadrant driver, and the system is complex, and the double-voltage high-speed permanent magnet motor loading device has the advantages of simple structure, low energy consumption, high reliability, good economy and the like, and can perform high-speed permanent magnet motor loading tests with 380V and 660V rated voltages in a time sharing manner.
The technical scheme of the invention is as follows:
a high-speed permanent magnet motor loading device comprises a tested motor driving device, a mechanical energy transmission device and an electric energy feedback device.
The motor drive device under test includes: the test system comprises a test high-speed permanent magnet motor driving circuit with a rated voltage of 380V and a test high-speed permanent magnet motor driving circuit with a rated voltage of 660V. The tested high-speed permanent magnet motor driving circuit with the rated voltage of 380V is formed by sequentially connecting a circuit breaker A5-1 and a 380V frequency converter 5-2, and the tested high-speed permanent magnet motor driving circuit with the rated voltage of 660V is formed by sequentially connecting a circuit breaker B4-1, a boosting transformer C4-2 and a 660V frequency converter 4-3. The two circuits are connected in parallel, wherein the input ends of a breaker A5-1 and a breaker B4-1 are simultaneously connected to a 380V commercial power grid, and the output ends of a 380V frequency converter 5-2 and a 660V frequency converter 4-3 are connected to a tested high-speed permanent magnet motor 1-1.
The mechanical energy transfer device includes: the testing-accompanying high-speed permanent magnet motor 1-2 and the transmission shaft 1-3 are connected, and the testing-accompanying high-speed permanent magnet motor 1-2 is connected with the tested high-speed permanent magnet motor 1-1 through the transmission shaft 1-3. The power output end of the accompanying high-speed permanent magnet motor 1-2 is connected with the input end of the electric energy feedback device.
The electric energy feedback device consists of two branches of a 380V/50Hz alternating current feedback circuit and a 660V/50Hz alternating current feedback circuit, and the input ends of the two branches are simultaneously connected with the electric power output end of the accompanying high-speed permanent magnet motor 1-2. The 380V/50Hz alternating current feedback circuit is sequentially connected by an input circuit breaker A2-4, a booster transformer A2-1, a three-phase rectifier A2-2, a 380V inverter 2-3 and a 380V output circuit breaker 2-5, and the output end of the 380V output circuit breaker 2-5 is connected with a 380V commercial power grid. The 660V/50Hz alternating current feedback circuit is formed by sequentially connecting an input breaker B3-4, a boosting transformer B3-1, a three-phase rectifier B3-2, a 660V inverter 3-3 and a 660V output breaker 3-5, wherein the output end of the 660V output breaker 3-5 is connected with the output end of a boosting transformer C4-2.
The power input end of the tested high-speed permanent magnet motor 1-1 and the power output end of the accompanying high-speed permanent magnet motor 1-2 are connected with a power measuring device 6.
The 380V inverter 2-3 and the 660V inverter 3-3 have a feedback action direct-current voltage threshold value adjusting function, and the loading power of the tested high-speed permanent magnet motor 1-1 is changed by adjusting the feedback action direct-current voltage threshold value.
And the output end of the 660V frequency converter 4-3 and the power input end of the tested high-speed permanent magnet motor 1-1 are provided with reactors 4-4.
A torque and rotating speed measuring instrument is arranged between the tested high-speed permanent magnet motor 1-1 and the accompanying high-speed permanent magnet motor 1-2, and an output signal of the torque and rotating speed measuring instrument is connected to a torque and rotating speed signal input end of the power measuring device 6.
The 380V inverter 2-3 and the 660V inverter 3-3 have synchronous grid connection functions.
The transmission shafts 1-3 are elastic couplings.
The 380V high-speed permanent magnet motor or the 660V high-speed permanent magnet motor selected by the accompanying high-speed permanent magnet motor 1-2 is not lower than the rated value corresponding to the tested high-speed permanent magnet motor 1-1 in rated speed and rated power.
The power measuring device 6 simultaneously measures the input electric power P of the tested high-speed permanent magnet motor 1-11And accompanying the high-speed permanent magnet motor 1-2 output electric power P2(ii) a The output electric power P of the accompanying high-speed permanent magnet motor 1-22And its known power generation efficiency η2The output shaft power P of the tested high-speed permanent magnet motor 1-1 can be calculated according to the formula 13According to the formula 2, the efficiency η of the tested high-speed permanent magnet motor 1-1 can be calculated1。
P3＝P2/η2(formula 1)
η1＝P3/P1(formula 2)
The invention has the beneficial effects that:
compared with a motor loading device with a speed reducer matched with a common asynchronous motor and a four-quadrant motor driver, the mechanical energy transmission device has the advantages that the speed reducer is omitted, the mechanical energy transmission device is simple and efficient in structure, the accompanying motor is a high-speed permanent magnet synchronous motor and can generate electricity by being dragged and rotated by the tested motor, the complicated control of the four-quadrant motor driver is not needed, 380V/50Hz alternating current feedback circuit and 660V/50Hz alternating current feedback circuit can respectively realize 380V voltage energy feedback and 660V voltage energy feedback, and the feedback power is adjustable. The energy saving effect is superior to that of brake-type loads.
Drawings
FIG. 1 is a prior art topology diagram
Wherein, the device comprises a 1-tested high-speed permanent magnet motor, a 2-asynchronous motor, a 3-speed reducer, a 4-four quadrant driver and a 5-motor driver.
Fig. 2 is a topology structure diagram of the present invention.
Wherein, 1-1-tested high-speed permanent magnet motor, 1-2-test accompanying high-speed permanent magnet motor, 1-3-transmission shaft, 2-1 step-up transformer A, 2-2-three-phase rectifier A, 2-3-380V inverter, 2-4-input breaker A, 2-5-380V output breaker, 3-1-step-up transformer B, 3-2-three-phase rectifier B, 3-3-660V inverter, 3-4-input breaker B, 3-5-660V output breaker, 4-1-breaker B, 4-2-step-up transformer C, 4-3-660V frequency converter, 4-4-reactor, 5-1-breaker A, A, 5-2-380V frequency converter and 6-power measuring device.
Detailed Description
The present invention is described in detail below with reference to the drawings and examples.
As shown in fig. 2, a high-speed permanent magnet motor loading device includes a tested motor driving device, a mechanical energy transmission device, and an electric energy feedback device.
The motor drive device under test includes: the test system comprises a test high-speed permanent magnet motor driving circuit with a rated voltage of 380V and a test high-speed permanent magnet motor driving circuit with a rated voltage of 660V. The tested high-speed permanent magnet motor driving circuit with the rated voltage of 380V is formed by sequentially connecting a circuit breaker A5-1 and a 380V frequency converter 5-2, and the tested high-speed permanent magnet motor driving circuit with the rated voltage of 660V is formed by sequentially connecting a circuit breaker B4-1, a boosting transformer C4-2 and a 660V frequency converter 4-3. The two circuits are connected in parallel, wherein the input ends of a breaker A5-1 and a breaker B4-1 are simultaneously connected to a 380V commercial power grid, and the output ends of a 380V frequency converter 5-2 and a 660V frequency converter 4-3 are connected to a tested high-speed permanent magnet motor 1-1. When the circuit breaker A5-1 is closed and the circuit breaker B4-1 is opened, the drive circuit of the tested high-speed permanent magnet motor with the rated voltage of 380V works, and can be used for carrying out a loading test on the tested high-speed permanent magnet motor 1-1 with the rated voltage of 380V. When the circuit breaker A5-1 is opened and the circuit breaker B4-1 is closed, the tested high-speed permanent magnet motor driving circuit with the rated voltage of 660V works and can be used for carrying out a loading test on the high-speed permanent magnet motor with the rated voltage of 660V.
The mechanical energy transfer device includes: the testing-accompanying high-speed permanent magnet motor 1-2 and the transmission shaft 1-3 are connected, and the testing-accompanying high-speed permanent magnet motor 1-2 is connected with the tested high-speed permanent magnet motor 1-1 through the transmission shaft 1-3. The power output end of the accompanying high-speed permanent magnet motor 1-2 is connected with the input end of the electric energy feedback device. The accompanying high-speed permanent magnet motor 1-2 generates power under the dragging of the tested high-speed permanent magnet motor 1-1 without an excitation control circuit, and the generated power is connected to the input end of the power feedback device. The rated rotating speed and the rated power of the accompanying high-speed permanent magnet motor 1-2 are not lower than those of the tested high-speed permanent magnet motor 1-1.
The electric energy feedback device consists of two branches of a 380V/50Hz alternating current feedback circuit and a 660V/50Hz alternating current feedback circuit, and the input ends of the two branches are simultaneously connected with the electric power output end of the accompanying high-speed permanent magnet motor 1-2. The 380V/50Hz alternating current feedback circuit is sequentially connected by an input circuit breaker A2-4, a booster transformer A2-1, a three-phase rectifier A2-2, a 380V inverter 2-3 and a 380V output circuit breaker 2-5, and the output end of the 380V output circuit breaker 2-5 is connected with a 380V commercial power grid. The 660V/50Hz alternating current feedback circuit is formed by sequentially connecting an input breaker B3-4, a boosting transformer B3-1, a three-phase rectifier B3-2, a 660V inverter 3-3 and a 660V output breaker 3-5, wherein the output end of the 660V output breaker 3-5 is connected with the output end of a boosting transformer C4-2. The input circuit breaker A2-4 and the 380V output circuit breaker 2-5 are closed, when the input circuit breaker B3-4 and the 660V output circuit breaker 3-5 are opened, a 380V/50Hz alternating current feedback circuit is put into operation, the generated voltage of the high-speed permanent magnet motor 1-2 is tested and input into the three-phase rectifier A2-2 after being boosted by the boosting transformer A2-1, the 380V inverter 2-3 inverts the direct current output by the three-phase rectifier A2-2 into 380V/50Hz alternating current to be output to a 380V commercial power grid, and the loading mode that the output power of the tested high-speed permanent magnet motor 1-1 is fed back to the power grid for reutilization is realized. The input circuit breaker A2-4 and the 380V output circuit breaker 2-5 are disconnected, when the input circuit breaker B3-4 and the 660V output circuit breaker 3-5 are closed, the 660V/50Hz alternating current feedback circuit is put into operation, the generated voltage of the high-speed permanent magnet motor 1-2 is tested and input into the three-phase rectifier B3-2 after being boosted by the booster transformer B3-1, the 660V inverter 3-3 inverts the direct current output by the three-phase rectifier B3-2 into 660V/50Hz alternating current to be output to the input end of the 660V frequency converter 4-3, and the loading mode that the output power of the tested high-speed permanent magnet motor 1-1 is fed back to the power grid for reuse is realized. The 380V inverter 2-3 and the 660V inverter 3-3 have synchronous grid connection functions.
The 380V inverter 2-3 monitors the direct-current voltage output by the three-phase rectifier A2-2, when the direct-current voltage output by the three-phase rectifier A2-2 is higher than a feedback action direct-current voltage threshold value set by the 380V inverter 2-3, the 380V inverter 2-3 starts inversion work, and outputs constant 380V/50Hz alternating current to feed back to a 380V commercial power grid. The feedback power of the 380V inverter 2-3 depends on a set feedback action direct-current voltage threshold value, and the smaller the threshold value is, the larger the feedback power of the 380V inverter 2-3 is. The loading power of the tested high-speed permanent magnet motor 1-1 can be changed by adjusting the feedback action direct current voltage threshold.
The 660V inverter 3-3 has the same working principle as the 380V inverter 2-3.
The power measuring device 6 can simultaneously measure the input electric power P of the tested high-speed permanent magnet motor 1-11And accompanying the high-speed permanent magnet motor 1-2 output electric power P2. The output electric power P of the accompanying high-speed permanent magnet motor 1-22And known power generation efficiency η2The output shaft power P of the tested high-speed permanent magnet motor 1-1 can be calculated according to the formula 13According to the formula 2, the efficiency η of the tested high-speed permanent magnet motor 1-1 can be calculated1。
P2＝P2/η2(formula 1)
η1＝P3/P1(formula 2)
Compared with a motor loading device with a speed reducer matched with a common asynchronous motor and a four-quadrant motor driver, the mechanical energy transmission device has the advantages that the speed reducer is omitted, the mechanical energy transmission device is simple and efficient in structure, the accompanying motor is a high-speed permanent magnet synchronous motor and can generate electricity by being dragged and rotated by the tested motor, the complicated control of the four-quadrant motor driver is not needed, 380V/50Hz alternating current feedback circuit and 660V/50Hz alternating current feedback circuit can respectively realize 380V voltage energy feedback and 660V voltage energy feedback, and the feedback power is adjustable. The energy saving effect is superior to that of brake-type loads.
Claims (8)
1. A high-speed permanent magnet motor loading device is characterized in that: comprises a tested motor driving device, a mechanical energy transmission device and an electric energy feedback device;
the motor drive device under test includes: the test high-speed permanent magnet motor driving circuit with the rated voltage of 380V and the test high-speed permanent magnet motor driving circuit with the rated voltage of 660V; the tested high-speed permanent magnet motor driving circuit with the rated voltage of 380V is formed by sequentially connecting a circuit breaker A (5-1) and a 380V frequency converter (5-2), and the tested high-speed permanent magnet motor driving circuit with the rated voltage of 660V is formed by sequentially connecting a circuit breaker B (4-1), a boosting transformer C (4-2) and a 660V frequency converter (4-3); the two paths are connected in parallel, wherein the input ends of a breaker A (5-1) and a breaker B (4-1) are simultaneously connected to a 380V commercial power grid, and the output ends of a 380V frequency converter (5-2) and a 660V frequency converter (4-3) are connected to a tested high-speed permanent magnet motor (1-1);
the mechanical energy transfer device includes: the test-accompanying high-speed permanent magnet motor (1-2) and the transmission shaft (1-3), wherein the test-accompanying high-speed permanent magnet motor (1-2) is connected with the tested high-speed permanent magnet motor (1-1) through the transmission shaft (1-3); the power output end of the accompanying high-speed permanent magnet motor (1-2) is connected with the input end of the electric energy feedback device;
the electric energy feedback device consists of two branches of a 380V/50Hz alternating current feedback circuit and a 660V/50Hz alternating current feedback circuit, and the input ends of the two branches are simultaneously connected to the electric power output end of the test-accompanying high-speed permanent magnet motor (1-2); the 380V/50Hz alternating current circuit is sequentially connected with an input circuit breaker A (2-4), a booster transformer A (2-1), a three-phase rectifier A (2-2), a 380V inverter (2-3) and a 380V output circuit breaker (2-5), and the output end of the 380V output circuit breaker (2-5) is connected with a 380V commercial power grid; the 660V/50Hz alternating current feedback circuit is sequentially connected with an input circuit breaker B (3-4), a step-up transformer B (3-1), a three-phase rectifier B (3-2), a 660V inverter (3-3) and a 660V output circuit breaker (3-5), and the output end of the 660V output circuit breaker (3-5) is connected with the output end of the step-up transformer C (4-2);
the power input end of the tested high-speed permanent magnet motor (1-1) and the power output end of the accompanying high-speed permanent magnet motor (1-2) are connected with the power measuring device 6).
2. The high-speed permanent magnet motor loading device according to claim 1, wherein: the 380V inverter (2-3) and the 660V inverter (3-3) have a feedback action direct current voltage threshold value adjusting function, and the loading power of the tested high-speed permanent magnet motor (1-1) is changed by adjusting the feedback action direct current voltage threshold value.
3. The high-speed permanent magnet motor loading device according to claim 1, wherein: and the output end of the 660V frequency converter (4-3) and the power input end of the tested high-speed permanent magnet motor (1-1) are provided with reactors (4-4).
4. The high-speed permanent magnet motor loading device according to claim 1, wherein: a torque and rotating speed measuring instrument is arranged between the tested high-speed permanent magnet motor (1-1) and the accompanying high-speed permanent magnet motor (1-2), and an output signal of the torque and rotating speed measuring instrument is connected to a torque and rotating speed signal input end of the power measuring device (6).
5. The high-speed permanent magnet motor loading device according to claim 1, wherein: the 380V inverter (2-3) and the 660V inverter (3-3) have synchronous grid connection functions.
6. The high-speed permanent magnet motor loading device according to claim 1, wherein: the transmission shafts (1-3) are elastic couplings.
7. The high-speed permanent magnet motor loading device according to claim 1, wherein: the 380V high-speed permanent magnet motor or the 660V high-speed permanent magnet motor selected by the accompanying high-speed permanent magnet motor (1-2) is not lower than the rated value corresponding to the tested high-speed permanent magnet motor (1-1) in rated speed and rated power.
8. A method as claimed in claim 1High-speed permanent-magnet machine loading device, its characterized in that: the power measuring device (6) simultaneously measures the input electric power P of the tested high-speed permanent magnet motor (1-1)1And the accompanying high-speed permanent magnet motor (1-2) outputs electric power P2(ii) a The output electric power P of the accompanying high-speed permanent magnet motor (1-2)2And its known power generation efficiency η2The output shaft power P of the tested high-speed permanent magnet motor (1-1) can be calculated according to the formula 13The efficiency η of the tested high-speed permanent magnet motor (1-1) can be calculated according to the formula 21；
P3＝P2/η2(formula 1)
η1＝P3/P1(equation 2).
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