FAN CONTROLLER, REFRIGERATION CYCLE SYSTEM AND METHOD FOR ESTIMATING ROTATION SPEED OF FAN

[PROBLEMS] A fan controller capable of preventing demagnetization of the permanent magnet of a motor and breakdown of a switching element on the negative side of an inverter even if starting control is performed while the fan is rotating with natural wind, and a refrigeration cycle system and a meth...

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Bibliographische Detailangaben
Hauptverfasser:	KAMBE TAKAYUKI, KAMIYA NAOHITO, ENDO TAKAHISA
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS BLASTING CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROL OR REGULATION THEREOF CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS GENERATION HEATING LIGHTING MECHANICAL ENGINEERING NON-POSITIVE DISPLACEMENT PUMPS POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC FLUIDS TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS WEAPONS
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Beschreibung
Zusammenfassung:	[PROBLEMS] A fan controller capable of preventing demagnetization of the permanent magnet of a motor and breakdown of a switching element on the negative side of an inverter even if starting control is performed while the fan is rotating with natural wind, and a refrigeration cycle system and a method for estimating the rotation speed of the fan. [MEANS FOR SOLVING PROBLEMS] A control means (13) is provided that turns on switching elements for three phases forming the negative side arm of an inverter at the time of starting, and, when the current level detected by a current level detecting means (11) under on state exceeds a protection level set lower than a level being judged as short circuit of the arm, resets the switching elements for three phases to off state thus interrupting the starting operation.