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Control system for three-phase motor

A technology of three-phase motors and control systems, applied in control systems, DC motor speed/torque control, electrical components, etc., can solve problems such as high cost, low power saving rate, shutdown accidents, etc., to achieve good operating conditions, The effect that the energy saving effect is remarkable

Inactive Publication Date: 2002-01-09
甘新东
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AI Technical Summary

Problems solved by technology

[0003] There are mainly two types of energy-saving control devices for existing AC motors: one is a simple star / delta switching device, such as the Chinese patent CN1111409, which proposes a microcomputer three-phase asynchronous motor power-saving protector. Although the control method Simple, but the power saving rate is not high, and the impact current is large when switching, and sometimes even cause shutdown accidents; the other is to use an AC voltage regulator, that is, automatically change the conduction angle of the thyristor according to the operating conditions of the motor, so that Energy saving is achieved by changing the terminal voltage of the motor. The main disadvantage of this type of device is that there is serious harmonic interference to the power grid, and the structure is complex, the cost is high, and it is inconvenient to use and maintain on site. The actual situation shows that this type of device It is also difficult to promote in practical applications

Method used

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  • Control system for three-phase motor
  • Control system for three-phase motor
  • Control system for three-phase motor

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Embodiment Construction

[0031] combine first figure 1 The content of the system is used to illustrate the working principle of the automatic control device of this system. Before the system is officially started, it must first be done: 1) Set the power selection device in the power selection circuit 4 to an appropriate power level; 2) Operate the dial switch K 3 Select the starting delay time; 3) check each threshold adjuster W in the signal processing unit 5, 6, 7 1 , W 2 , ... Whether it has been adjusted according to the predetermined requirements.

[0032] When starting, first close the switch K 1 , the power required by the system is added to each power supply end of the circuit, and the display LED 11 should glow. At this time, if the display LED 8 Lights up, indicating that the three-phase voltage power supply of the power grid is normal, and at the same time the output breaker J 2 When excited, its contacts are closed, and the controlled motor starts to work. Within the range of start...

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Abstract

A control system of three-phase motor is composed of sampling tester, signal processor, single-chip computer controller and star / triangle switching controller, and has such functions as switching the connecting mode of windings according to load variation, selecting start time and power, and automatic protection to phase lost, overload, short circuit, overvoltage, undervoltage and unbalanced three phases. Its advantages are high load efficiency, saving energy and low cost. It also has a stand-by manual control system.

Description

technical field [0001] The present invention relates to the control of electric motors, and more particularly to three-phase AC motor control systems. Background technique [0002] At present, the load rate of AC motors used in large quantities is generally relatively low, resulting in serious waste of electric energy. The national energy-saving policy of "paying equal attention to development and conservation, and prioritizing conservation" will inevitably generate a huge impetus to the development and application of energy-saving technology for AC motors. Therefore, it is also an inevitable trend to realize comprehensive control of starting, energy saving and protection of the AC motor mechanism. [0003] There are mainly two types of energy-saving control devices for existing AC motors: one is a simple star / delta switching device, such as the Chinese patent CN1111409, which proposes a microcomputer three-phase asynchronous motor power-saving protector. Although the contr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08
Inventor 甘新东
Owner 甘新东
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