MOTOR COMPRESSOR

• Main Authors: KUBOTA MASASHI, YASUDA KENTA
• Format: Patent
• Language: English; Japanese
• Published: 05.10.2023
• 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; ELECTRICITY; GENERATION

To provide a motor compressor that enables stable rotation when performing upper and lower two-phase modulation.SOLUTION: A control device 40 is configured to perform correction processing corresponding to a dead time on a voltage pulse generated from a rotational speed command value ω*, and output a control signal Vpu' such that the voltage pulse applied to a motor 5 when an inverter 30 receives a plurality of drive signals has a pulse width corresponding to the rotational speed command value ω*. In the correction processing, the control device 40 executes switching control for switching whether to increase or decrease the pulse width of the control signal Vpu' on the basis of the polarity of the current flowing through each phase of a three-phase coil. The control device 40 determines the voltage fixed phase switching timing in the upper and lower two-phase modulation control for each phase of the three-phase coil so as to match the switching timing in the switching control.SELECTED DRAWING: Figure 1 【課題】上下二相変調を行なう場合に、安定した回転が可能となる電動圧縮機を提供する。【解決手段】制御装置４０は、インバータ３０が複数の駆動信号を受けてモータ５に印加する電圧パルスが、回転速度指令値ω＊に対応するパルス幅となるように、回転速度指令値ω＊から生成された電圧パルスにデッドタイムに対応する補正処理を行なって制御信号Ｖｐｕ′を出力するように構成される。制御装置４０は、補正処理において、三相コイルの各相に流れる電流の正負に基づいて、制御信号Ｖｐｕ′のパルス幅を増加させるか減少させるかを切替える切替制御を実行する。制御装置４０は、三相コイルの各相に対して、切替制御における切替タイミングに一致させるように、上下二相変調制御における電圧固定相の切替タイミングを決定する。【選択図】図１