Usefulness of Frequency-Hybrid Vector Control for Sensorless Induction Motor Drive

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  • センサレス誘導モータ駆動のための周波数ハイブリッドベクトル制御法の有用性評価
  • センサレス ユウドウ モータ クドウ ノ タメ ノ シュウハスウ ハイブリッド ベクトル セイギョホウ ノ ユウヨウセイ ヒョウカ

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Abstract

This paper newly examines and presents usefulness of recently proposed frequency-hybrid vector control scheme for sensorless induction motor drive through actual-machine-based performance evaluation tests. The scheme is characterized by utilizing a new indirect orientation scheme and a stable-filter-embedded direct orientation scheme, and exploiting their advantages. It is confirmed through the extensive tests by small to big standard motors such as 0.3, 3.7, 30 (kW) and special low-voltage motors dedicated to electric vehicles that the sensorless vector control scheme has the following potential usefulness: 1) it can make machines to produce more than 200% rated torque at standstill, 2) in both modes of motoring and regenerating, rated torque can be produced even in very slow speed range including zero-speed and zero-frequency, 3) for constant speed, good linearity of torque response is attained, 4) it has ability to make machines to track variable speed command of acceleration up to ±5, 000 (rad/s2) in mechanical frequency sense, 5) it can accept zero-speed command and settles the machines at a stable standstill with no-vibration, 6) it accepts instant injection of rated load even for zero-speed control, 7) it accommodates a load of huge inertia.

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