FIELD COIL TYPE SYNCHRONOUS MOTOR

• Main Authors: IIZUKA MOTONOBU, KOYAMA TAKAYUKI, KOORI DAISUKE
• Format: Patent
• Language: English; Japanese
• Published: 31.08.2017
• Subjects: 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; 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; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION

PROBLEM TO BE SOLVED: To solve the problem that a field coil type synchronous motor may require a measure to reduce a possibility to reconnect a DR even under surge or noise after synchronous operation, the field coil type synchronous motor including the DR on a field circuit and comprising a circuit capable of performing switching to the synchronous operation and a disconnection of the DR.SOLUTION: A field coil type synchronous motor comprises: a rotor; a stator; an exciter which causes a current to flow to a field coil of the rotor; and a rectifier circuit by which output of the exciter is rectified and given to a DC line, and is connected to the DC line. In the field coil type synchronous motor, a first circuit in which a parallel circuit consisting of a rectification element and a first switching device and a discharge resistor are connected in series is connected in parallel to the field coil. A second switching device is connected in series to the DC line that connects the first circuit and the rectifier circuit. A capacitor is provided between an input side of a power supply element for switching the first switching device and the discharge resistor.SELECTED DRAWING: Figure 3 【課題】界磁巻線型同期電動機において、界磁回路上にDRを有し、同期運転への切り替えとDRの切り離しを行える回路を備え、同期運転後にサージやノイズ等でもDRが再接続される可能性を低減させる措置が必要となる。【解決手段】回転子と、固定子と、前記回転子の界磁巻線に電流を流すエキサイターと、エキサイターの出力を整流して直流線路に与える整流回路と、を備え、直流線路に接続した界磁巻線型同期電動機において、整流素子および第1の開閉装置からなる並列回路と放電抵抗とを直列接続した第1回路を、界磁巻線に対して並列に接続し、第1回路と整流回路を接続する直流線路に第2の開閉装置を直列に接続し、第1の開閉装置を開閉するための電源素子の入力側と前記放電抵抗の間に、コンデンサを設けた界磁巻線型同期電動機。【選択図】 図3