DTC - Direct Torque Control

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DTC - Direct Torque Control

• ABB sustav regulacije momenta i brzine vrtnje
  frekvencijom reguliranih asinhronih motora

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Usporedba reguliranih pogona
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Energetski krug pretvaraca ACS 600 20-40 kVA
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DTC sustav regulacije
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Blok shema pretvaraca ACS600 snage 60-100 kVA
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Measurements - Mjerenja

• Step response of torque control Odziv
  regulacije momenta
• Torque ramp at zero speed Linearna promjena
  momenta na 0 brzine
• Estimated shaft speed in torque ramp Brzina
  osovine pri promjeni momenta
• Slow fast reversing Polagano i brzo
  reverziranje
• Dynamic speed accuracy Tocnost regulacije
  brzine
• All measurements are on DTC if not otherwise
  stated all DTC measurements are done without
  tacho.

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Step response of torque control

• 70 torque reference step at 25 Hz. Measured
  air-gap torque and phase current.

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Step response of torque control

• 70 torque reference step at 25 Hz. Estimated
  air-gap torque.

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Torque ramp at zero speed DTC

• Torque ramp from 100 to -100 at zero speed
  (shaft locked). Shaft torque is measured.

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Torque ramp at zero speed scalar control

• Torque ramp from 100 to -100 at zero speed
  (shaft locked). Shaft torque is measured.

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Torque ramp at zero speed vector control

• Torque ramp from 100 to -100 at zero speed
  (shaft locked). Shaft torque is measured.

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Estimated shaft speed in torque ramp
Zero speed torque ramp from Tnom to - Tnom

• Speed accuracy is better than 0,5 at zero
  speed. No tacho.

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Slow reversing

• Slow reversing with constant torque reference
  (80 ). Shaft torque and speed are measured.

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Fast reversing

• Fast reversing with constant torque load (-20
  ). Shaft torque and speed are measured.

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Fast reversing

• Fast reversing with constant torque load (-20
  ). Phase current is measured.

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Dynamic speed accuracy

• Shaft speed with nominal torque step speed ctl.
  gain high

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Dynamic speed accuracy

• Shaft speed with nominal torque step speed ctl.
  gain low

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Dynamic speed accuracy

• Shaft speed with nominal torque step speed ctl.
  gain low

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Step response of speed control

• Step response of speed control (without
  tachometer)

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Opteretivost pogona s DTC pretvaracem