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Motor variable-frequency drive control method and system

A technology of the main motor and limiter controller, which is applied in the control system, the control of the speed or torque of the motor, and electrical components, etc., which can solve the problems of motor runaway speed, safety accidents, easy runaway speed, etc., and improve the reliability of work. performance, reduced power levels, and improved convenience

Inactive Publication Date: 2020-08-18
ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Mode 1 is only suitable for the hard connection control system, and mode 2 is only suitable for the soft connection control system, and neither of the two schemes can adapt to the two connection modes of hard connection and soft connection at the same time;
[0007] 2. Modes 1 and 2 cannot operate in master-slave mode when the connection is undone, because the single torque ring cannot achieve stable operation of the motor when the connection is undone, which brings inconvenience to debugging and testing. Mode 2 In the case of severe belt slippage, the slave machine (only torque control) is prone to run out of control
When the load torque of the motor is suddenly lost, such as when the wheels of the electric vehicle are slipping or the tires on uneven roads leave the ground during the uphill process of the electric vehicle, or the component under test in the experimental system fails to cause the load of the accompanying motor to leak, etc. Torque control is easy for the motor to run out of control, which will damage the equipment and cause safety accidents in severe cases

Method used

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  • Motor variable-frequency drive control method and system
  • Motor variable-frequency drive control method and system
  • Motor variable-frequency drive control method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, the motor variable frequency drive control method of this embodiment is applied to the control of multiple motors. In this embodiment, there are two motors, respectively a master motor and a slave motor. The master motor and the slave motor are hard-connected (as Shaft or gear transmission connection, etc.) or soft connection (such as belt, etc.), the specific control method is:

[0035] Obtain the real-time speed of the main motor and the slave motor, and after making a difference from the given speed, input it to the corresponding speed regulator, and output the corresponding speed signal;

[0036] After the speed signal is limited and adjusted by the limit controller, the torque given value is output to the corresponding torque regulator; at the same time, the torque real-time value of each motor is obtained;

[0037] The torque regulator performs torque closed-loop control on the motor according to the torque given value and the real-tim...

Embodiment 2

[0044] Such as figure 2 As shown, the motor variable frequency drive control method of this embodiment is applied to the control of a single motor, so that the control system with only a single torque control is added to the speed control. In the case of load leakage, etc., the speed control can effectively control the speed of the motor. No loss of control will occur. The specific control process is the same as that of the main motor in Embodiment 1, except that the input of the limiter controller of the motor takes the preset torque given value T ref_M1_Set with the motor speed regulator output value ω PI_out1 The smaller of the two. Other contents not described are the same as those in Embodiment 1, and will not be repeated here.

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Abstract

The invention discloses a motor variable-frequency drive control method. The mehtod comprises the following steps of acquiring the real-time rotating speed of each motor, subtracting the real-time rotating speed from a given rotating speed, inputting the difference into a corresponding speed regulator, and outputting a corresponding rotating speed signal; after amplitude limiting adjustment is conducted on the rotating speed signal through an amplitude limiting controller, outputting a torque given value to a corresponding torque adjuster; meanwhile, obtaining the torque real-time values of all the motors; and using the torque regulator to perform the torque closed-loop control on the motor according to the torque given value and the torque real-time value. The invention further disclosesa motor variable-frequency drive control system which comprises a processor and a memorizer, a computer program is stored in the memorizer, and the control method is achieved when the program is executed by the processor. The motor variable-frequency drive control method and system has the advantages of improving the working reliability of the motor and the like.

Description

technical field [0001] The invention mainly relates to the technical field of motors, in particular to a method and system for controlling frequency conversion drive of motors. Background technique [0002] The multi-machine drive system is basically divided into two modes: hard connection and software connection. The hard connection drive is such as motor coaxial or gear connection; the soft connection drive is mostly belt connection. The difference between hard connection and soft connection: in hard connection drive, because the two motors are coaxial or gear connected, the speed of the two motors is strictly synchronized; in soft connection drive, because the two motors are connected by a belt, because the belt Slipping may occur due to external influences, so that the speed of the two motors cannot be strictly synchronized. Not only at a certain moment during the operation, the speed of the two motors may be inconsistent, but also in the initial state of the startup. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P5/747
CPCH02P5/747
Inventor 秦灿华彭勃何亚屏成正林张志张哲陈孟君韩志成奥恩李嘉喻通罗何
Owner ZHUZHOU NAT ENG RES CENT OF CONVERTERS