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Control system of brushless direct current variable frequency motor

A DC frequency conversion motor and control system technology, applied in the direction of single motor speed/torque control, starting device, etc., can solve the problems of waste of electric energy, difficulty in starting, etc., and achieve the goal of avoiding the dead point position, ensuring the rotation effect, and ensuring the effect Effect

Inactive Publication Date: 2021-12-17
新沂维志途电气工程研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, during the use of the existing brushless DC variable frequency motor, when the rotational angular position of the rotor is near the electrical angle of 180° angle (dead point), the rotor is uncontrollable relative to the final angle to be positioned, which leads to start-up Difficult, and the speed control of the existing motor is mainly controlled by the current magnitude of the phase coils, but in the process of motor idling, the overall current flow of the motor phase coils does not change, but the magnitude of the current is reduced, and the phase coils still work at the same time, thus cause waste of electricity

Method used

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  • Control system of brushless direct current variable frequency motor
  • Control system of brushless direct current variable frequency motor
  • Control system of brushless direct current variable frequency motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] refer to figure 2 , the starting steps of the brushless DC variable frequency motor include:

[0050] S1. The main electronic control module receives the start command, the power supply module supplies power to the system, and at the same time, the position detection module detects the position status of the permanent magnet of the rotor, judges the N-level and S-level positions of the permanent magnet, and transmits the position information to the main electronic control module;

[0051] S2. The steering detection module detects the initial state of the rotor. If the initial state of the rotor is rotating, the output result is Z1. If the initial state of the rotor is stationary, the output result is Z0, and the rotating state of the rotor is transmitted to the electronic main control module;

[0052] S3. The main control unit of the main electronic control module receives the position information, and according to the N-level and S-level position information of the pe...

Embodiment 2

[0057] refer to image 3 , when the brushless DC variable frequency motor rotates or starts, it also includes judging the output power, and the specific steps include:

[0058] D1. The power identification module identifies the external required output power, determines the size of the power Pn, and transmits the power information to the main electronic control module.

[0059] D2. The power pairing unit of the main electronic control module is preset with a first threshold Po and a second threshold Pt. The main control unit performs a logical comparison between the received power Pn and the set first threshold and second threshold. When Pn≥Po, Then control the full power output of the current control module. When Po>Pn≥Pt, the current control module specifies the current output. When Pn<Pt, the current control module controls the phase coil and the phase coil of the permanent magnet to energize;

[0060] D3. The current control unit receives the pairing information and contr...

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Abstract

The invention relates to the technical field of motor control, and discloses a control system of a brushless direct current variable frequency motor. The control system comprises a main electronic control module, a power supply module, a position detection module, a current control module, a voltage detection module, a power identification module and a steering detection module; pairing information is received through a current control unit, and the current starting and the current direction of a current sub-control unit of the current control module are controlled; and if received output current is positive and negative bidirectional current, the front end of the rotation direction of each permanent magnet is controlled to output opposite-direction magnetic pole current, and the rear end of the rotation direction of each permanent magnet is controlled to output same-direction magnetic pole current; If receiving phase coil output current is unidirectional, phase coils are controlled to perform differential unidirectional current output, the same-direction phase coils of the adjacent unit permanent magnets input same-direction current; and the distances between the adjacent phase coils and the permanent magnets are synchronized by one unit, so that the dead point position is avoided, the starting effect and response speed of a rotor are effectively ensured, and the controllability of the rotor is improved.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a control system for a brushless DC variable frequency motor. Background technique [0002] The brushless DC motor is composed of the main body of the motor and the driver. It is a typical mechatronics product. The stator windings of the motor are mostly made into a three-phase symmetrical star connection. The rotor of the motor is glued with magnetized permanent magnets. The advantages of the traditional DC motor, while canceling the structure of carbon brushes and slip rings, running at low speed and high power, can save the reducer to directly drive large loads, excellent torque characteristics, good torque performance at medium and low speeds, and starting torque Big plus. In recent years, it has developed rapidly. [0003] However, during the use of the existing brushless DC variable frequency motor, when the rotational angular position of the rotor is near the elect...

Claims

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Application Information

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IPC IPC(8): H02P6/08H02P6/20
CPCH02P6/08H02P6/20
Inventor 许瑞峰
Owner 新沂维志途电气工程研究院有限公司
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