Solenoid-drive liquid metallic rheostat

Abstract

The invention relates to a solenoid-drive liquid metallic rheostat which is characterized by comprising a casing, paraffin, a copper wire, a communicating vessel, liquid metal and an electromagnetic pump. The casing is filled with the paraffin and the copper wire; the communicating vessel is located on one side of the casing and is connected with one end of the copper wire; the electromagnetic pump is mounted at the bottom of the communicating vessel; and the liquid metal is stored in the communicating vessel, moves up and down under the driving of the electromagnetic pump and is contacted with the copper wire at different height positions, so that the length of the copper wire placed in a circuit is hanged and the variable resistance effect is achieved. The solenoid-drive liquid metallic rheostat takes the copper wire as the main body, utilizes the electromagnetic pump to drive the liquid metal to move to adjust the copper wire resistance, and adopts the paraffin to absorb joule heat, so that the whole system is stable and reliable, small in size, light in weight and low in cost, and can be widely applied to the field of soft starting of motors.

Description

technical field [0001] The invention relates to an electromagnetically driven liquid metal rheostat. Copper wire is used as the main body of the rheostat, an electromagnetic pump is used to drive the liquid metal to move to adjust the resistance of the copper wire, and paraffin is used to absorb Joule heat. The liquid metal rheostat provided by the invention is stable, reliable, small in size, light in weight and low in cost, and can be widely used in the soft start of electric motors. Background technique [0002] Because of its simple structure, reliable operation, convenient maintenance, and low price, AC motors are widely used as the power of electric drive production machinery, and have a large number of applications in various industries. The motor starts directly under constant voltage, and its starting current is about 6-12 times of the rated current, and its speed needs to rise from zero to the rated speed in a short time, which will produce an impact during the sta...

AI Technical Summary

Problems solved by technology

The liquid rheostat has the characteristics of simple structure and stepless variable resistance, but the liquid rheostat uses an aqueous solution of sodium carbonate or sodium chloride. On the one hand, due to the strong corrosiveness of the salt solution, corrosion of the travel switch shell and contact with the conductive contact often occur. On the other hand, the salt solution is easy to boil and evaporate at high temperature, so the amount of salt solution needs to be increased to increase the heat capacity, resulting in a bulky equipment; and the salt solution is volatile at room temperature and needs to be continuously replenished, which increases the complexity of the operation

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