Equipment with resistance measurement device and method for measuring carbon brush contact resistance

Abstract

The invention relates to equipment with a resistance measurement device. The equipment comprises a machine frame rotating part, a slip ring system and a ground lead connected with the slip ring system. The machine frame rotating part is in ground connection through the slip ring system and the ground lead. The resistance measurement device is connected with the slip ring system. The device can exert appointed voltage on the ground lead. Carbon brush contact resistance of the slip ring system is calculated through measurement of currents on the ground lead after the appointed voltage is exerted. The invention further provides a method for measuring the carbon brush contact resistance of the slip ring system. Through the adoption of the equipment or the method, that fact that the carbon brush contact resistance does not exceed 0.1omega can be guaranteed, and thus potential safety hazards are reduced or avoided.

Description

technical field [0001] The invention relates to the field of industry or medicine, in particular to a device with a resistance measuring device and a method for measuring the contact resistance of a carbon brush. Background technique [0002] According to the requirements of the International Electrotechnical Commission IEC 60601-1:2005, IEC60601-2-44:2009 and IEC60601-2-28:2010, X-ray tubes and high voltage generators in computed tomography equipment (CT) must be connected to a Protectively grounded power supply. In the current CT equipment, the connections between the power supply and the ground between the rotating part of the frame and the stationary part of the frame are all realized through the carbon brushes of the slip ring system. Due to long-term use of carbon brushes, there will be wear and tear, which will affect the elastic pressure of the springs on the carbon brushes, resulting in an increase in the contact resistance of the carbon brushes, and then it is imp...

AI Technical Summary

Problems solved by technology

Due to long-term use of carbon brushes, there will be wear and tear, which will affect the elastic pressure of the springs on the carbon brushes, resulting in an increase in the contact resistance of the carbon brushes, and then it is impossible to ensure that the contact resistance of the carbon brushes (that is, the grounding resistance of the rotating part of the frame) does not exceed 0.1 Ω, thus likely to cause safety and power quality issues

At present, CT equipment ensures equipment safety by regularly replacing the carbon brushes, but if the carbon brushes are seriously worn due to improper operation and use before the regular replacement, then this regular replacement will be very untimely, burying hidden dangers for safety; and if the carbon brushes are removed After the original carbon brush is found to be in good use and not worn out, then this kind of disassembly is a waste of manpower and cost

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