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Apparaus for improving electric rheological effect

An electro-rheological and electro-rheological fluid technology, applied in electromechanical devices, fluid pressure actuators, electrical components, etc., can solve problems such as weak current, low voltage, and narrow frequency range, and achieve simple adjustment methods, easy control, and increased The effect of the large electrorheological effect

Inactive Publication Date: 2003-09-17
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Literature J.E.STANGROOM, Proc.2nd Int.Conf.OnElectrorheological fluid, Technomics Publishing Co. Iancaster, 1990, P419. The research on the application of alternating current below 50Hz to the electrorheological fluid involves narrow frequency range, low voltage and weak current. The results of the study are insufficient to explain the frequency effect on the nature of ERF

Method used

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  • Apparaus for improving electric rheological effect
  • Apparaus for improving electric rheological effect
  • Apparaus for improving electric rheological effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The electrorheological fluid used in this example is made of 35umKN b o 3 Crystal powder and silicone oil are mixed at a volume ratio of 0.1. Use the Nxs-11 rotary viscometer to measure the viscosity coefficient of the electrorheological fluid, and the whole measuring device presses figure 1 connection, which employs a circuit figure 2 . figure 2 described as follows:

[0026] C in the picture ER It is an electrorheological fluid device, B is a booster, E is a variable frequency high-voltage current, its frequency and amplitude are continuously adjustable, and the secondary high voltage HV of the transformer is connected with the electrorheological fluid C through the current limiting resistor R ER Associated, when E is constant, the secondary loop is in f = 1 2 π LC ER resonant frequency. If changi...

Embodiment 2

[0028] C ER The electrorheological fluid device is the same as in embodiment 1, and its circuit connection mode is as follows: image 3 The connection shown, where image 3 L in is a large inductance with high Q value. When changing the frequency of E, the loop resonates at f = 1 2 π LC ER In terms of frequency, when the Q value of L is 100, if the input voltage is 100V, then at resonance, C ER A voltage of 10,000 volts can be obtained.

Embodiment 3

[0030] C ER The electrorheological fluid device is the same as in embodiment 1, and its circuit connection mode is as follows: Figure 4 The connection shown, where Figure 4 How it works in the same way as image 3 The same, the main difference is that when E is selected in the low frequency range, when L is fixed, it can be changed and in the electrorheological fluid C ER The capacity of the capacitor C' makes its circuit resonant. C'requires a capacitor with high voltage resistance, and its loss should be as small as possible.

[0031] Figure 6 In the case of a certain electric field (every curve remains unchanged). The relationship between the current of the electrorheological fluid and the frequency, as shown in the curve (b), at this time, the electrorheological fluid is under the action of a fixed external electric field (Uc=600V / mm), as the frequency increases, the current increases proportionally, correspond to this image 3 It can be seen from the middle curv...

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Abstract

The invention relates to a device for enhancing the electrorheological effect, which includes: adopting a multi-plate parallel connection mode: the outer electrode is composed of a series of metal coaxial unit electrodes, and the electrode is embedded in the outer electrode insulating sleeve and a sealed bearing to form a tight fit connection mode, The outer electrode is set outside the inner electrode, and the inner electrode is concentric discs interlaced and embedded on the motor shaft. The inner rotating metal electrode and the outer electrode form a non-contact concentric way, and its end is connected with the outer motor shaft through a sealed bearing. The electrodes are insulated from each other, and the gap formed by the inner and outer electrodes is filled with electrorheological fluid; the shaft of the motor passes through and is fixed at one end of the insulating sleeve, the sealed bearing is connected with the inner electrode, and the connecting shaft is inserted into another sealed bearing to connect with the insulating sleeve, supporting The frame supports the connecting shaft, and the terminal is connected with the variable frequency high voltage current source; the variable frequency high voltage power supply includes a booster (B) whose input is a frequency variable high voltage current (E) with continuously adjustable frequency and amplitude, and the transformer secondary high voltage (HV ) through the current limiting resistor (R) and the electrorheological fluid (C ER ) associated.

Description

technical field [0001] The invention relates to a device for enhancing the electrorheological effect by increasing the frequency of the electric field. Background technique [0002] Electrorheological fluid (Electrorheological fluid referred to as ER fluid). It refers to a mixed liquid whose viscosity will increase under the action of an electric field. This substance is generally a mixture of solid particles with a size of 1-100 microns and a non-conductive liquid. When no external voltage is applied, it shows the characteristics of a liquid. When a voltage is applied to this substance, when the voltage reaches a certain level (for example, 1000V / mm), this substance will become similar to a solid with very high viscosity and can be Withstand high shear force. The response time for this change is on the order of milliseconds. When the voltage is removed, it immediately returns to liquid. The important application value of this effect is that it can be used in mechanical...

Claims

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Application Information

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IPC IPC(8): C10M171/00F15B21/04H02K7/10
Inventor 温维佳陆坤权
Owner INST OF PHYSICS - CHINESE ACAD OF SCI