Ventilation device

A shunt resistor (18) is inserted, for each phase, between the latter stage of each phase of an inverter circuit (15) and the negative potential side. The potential difference, which is generated by current flowing in the shunt resistor (18), between both ends of the shunt resistor (18) is amplified...

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Bibliographic Details
Main Authors ITOU HARUMOTO, YAMAGUCHI MASAHIRO, NAKAJIMA TSURAKI, UENO TEIKYO, DOUMOTO KAZUKI, TAKENAWA SHINGO
Format Patent
LanguageEnglish
Published 17.02.2016
Subjects
BLASTING
HEATING
LIGHTING
MECHANICAL ENGINEERING
NON-POSITIVE DISPLACEMENT PUMPS
POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS
PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
WEAPONS
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Summary:A shunt resistor (18) is inserted, for each phase, between the latter stage of each phase of an inverter circuit (15) and the negative potential side. The potential difference, which is generated by current flowing in the shunt resistor (18), between both ends of the shunt resistor (18) is amplified by an amplifying unit (19). A current detecting unit (20) detects, from the output of the amplifying unit (19), the current of each phase flowing to a motor (8) comprising a sensorless brushless DC motor. A rotation detecting unit (25) calculates the speed and position of the motor (8) on the basis of the current detected by the current detecting unit (20). By virtue of this configuration, the current in the motor winding wire can be accurately detected and a ventilation device can always maintain a constant ventilation air speed, from a low air volume to a high air volume, because the current flowing only in the winding wire of the motor (8) can be directly detected.
Bibliography:Application Number: CN2014836942