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A slip control digital intelligent speed regulation and system of motor without speed transducer

A speed sensorless, control digital technology, applied in the direction of slip frequency control, AC motor control, control system, etc., can solve the problems that affect the popularization and application of chopper series modulation system, pulse loss speed, and poor speed regulation performance. Achieve significant economic and social benefits, start smoothly, and respond quickly

Inactive Publication Date: 2008-07-09
张振武 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of chopping, the original method of using the rectifier bridge voltage as the actual speed to build a closed-loop speed can no longer be used because the error is too large. Therefore, some products use open-loop control to control the speed of the chopping duty cycle, and the speed control performance is naturally poor. ;Some products use the method of adding simple pulse speed measurement to build a speed closed loop, which is not only troublesome to install, but also often causes speed out of control problems caused by pulse loss during operation
These problems have affected the further popularization and application of the chopping and string modulation system

Method used

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  • A slip control digital intelligent speed regulation and system of motor without speed transducer
  • A slip control digital intelligent speed regulation and system of motor without speed transducer
  • A slip control digital intelligent speed regulation and system of motor without speed transducer

Examples

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Effect test

Embodiment 1

[0084] According to Fig. 1, the present invention is applied to a specific application example of an internally-fed winding asynchronous motor. In the picture, M is an internally-fed wound asynchronous motor. The stator winding is supplied by the 6kV or 10kV power grid through the high-voltage switchgear. The rotor winding is connected to the soft starter RQD. If the motor capacity is below 1000KW, frequency-sensitive rheostats are often used to start. , The large-capacity motor uses water resistance to start. The start of the motor is controlled by PLC. If there is no fault or alarm in the soft start circuit, a start signal is given on the touch screen. If there is a fault or alarm, a signal forbidden to close is given; if the slip rate controls the speed control of the SKT part and the rotation The differential power feedback SGH part has no faults and alarms. The touch screen will give an allowable speed control signal. If there is a fault or alarm, a prohibition of speed contr...

Embodiment 2

[0087] According to Figure 2, the present invention is applied to a specific application example of a common wound asynchronous motor. In the figure, M is an ordinary wound asynchronous motor without feedback winding. The rotor slip power must be fed back to the grid through the external-fed transformer WT. Therefore, the primary winding of the external-fed transformer is connected to the lower end of the high-voltage switch cabinet connected to the stator winding of the motor, and the secondary winding of the external-fed transformer is connected to the converter. The outlet end of the filter LCL of the differential power feedback circuit SGH. Others are the same as in Example 1.

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Abstract

The invention discloses a non-speed sensor slip speed-adjusting digital and intelligent speed-adjusting method and a system which comprises a motor, soft start equipment, a slip speed-adjusting, a slip power feedback and a programmable controller and is characterized in that: the slip speed-adjusting comprises a rotor rectifier, a chopper and a digital signal processor DSP1, exerts the dual-ring control of non-speed sensor speed measurement and the motor speed current, and transfers the slip energy to the electric energy; the slip power feedback comprises an inverter, a filter and a digital signal processor DSP2, exerts the dual-ring control of feedback circuit voltage current, and feedbacks the energy to a power net; the programmable controller exerts the whole system program control, and comprehensive fault and process. The invention is suitable for the common wire winding asynchronous motor and the inner-feeding wire winding asynchronous motor, and is characterized in using the low voltage device to control the medium voltage motor. Meanwhile, the invention has the advantages of simple circuit, good performance, perfect function, kind interface and simple and convenient operation.

Description

Technical field [0001] The invention relates to a rotor slip rate control digital intelligent speed regulation system for medium voltage ordinary winding asynchronous motors or internal-fed winding asynchronous motors, in particular to a speed sensorless motor slip rate control digital intelligent speed regulation system The speed system and its speed regulation method belong to the field of medium voltage (3 kV, 6 kV, 10 kV) large-capacity motor speed regulation. Background technique [0002] Energy-saving, emission-reduction and optimizing the environment is an important task to achieve the sustained and stable development of my country's national economy, and is the main theme of the current society. The promotion of speed regulation and energy saving of medium voltage motors with the largest electricity consumption is one of the major measures for energy saving and emission reduction. With the increase of national awareness of energy conservation, the demand for high-performa...

Claims

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Application Information

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IPC IPC(8): H02P23/08H02P23/14H02P27/05G05B19/05
Inventor 张振武
Owner 张振武
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