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ทฤษฎีเครื่องจักรไฟฟ้าเหนี่ยวนำ PowerPoint PPT Presentation


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ทฤษฎีเครื่องจักรไฟฟ้าเหนี่ยวนำ. ทฤษฎีเครื่องจักรไฟฟ้าเหนี่ยวนำหลายเฟส. เครื่องจักรเหนี่ยวนำในอุดมคติ. เครื่องจักรเหนี่ยวนำ 3- เฟส ในอุดมคติ. แนวแกนของเส้นแรงแม่เหล็กของ Rotor แต่ละเฟสให้ทำมุม. กับแนวแกนของ Stator. = ความเร็วเชิงมุมของ Rotor.

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3-

Rotor

Stator

= Rotor


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3

Slip s

= Stator


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6

Stator :

Rotor:


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Stator:


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Rotor :


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Flux linkage Stator Rotor

Stator:

Rotor:


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dq

Stator 3-

mmf d q

Stator

kd kq 2/3

Components mmf


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d q

iaib ic

Stator flux linkage Statorvoltage

Synchronous machines

Note :


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Rotor

dq

Rotor A d

Rotor Slip s d

Rotor

Subscript s

Slip


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Component Rotor-mmf

Factor 2/3 Stator Rotor dq


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Matrix form Synchronous machines

Stator :


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Rotor :


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dq

Flux linkage dq Stator Rotor

Stator :

Rotor :


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dq Flux linkage

Stator :

Rotor :

Slip angular velocity

+Motor operation

-Generator operation

Stator Transformer voltage Speed voltage


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Stator

dq

Rotor

Rotor dq

()


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Mechanical radians

  • Steady state

Slip s Stator

Rotor Stator


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dq

StatorRotor

d a

Stator


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Phasor

StatorRotor


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Flux linkage

Stator:

Rotor :


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Stator

Rotor


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Stator


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Transformer voltage


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Note :

Statorq1 phase

Note :

Mechanical radian


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Steady state characteristic

Rotor

Stator Rotor


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Thevenins Theorem

Thevenins theorem


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Thevenins theorem


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V1a ab Rotor

I0 Exciting current

ab


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Torque-Slip Characteristic

Thevenin equivalent circuit

Slip-torque curve


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Breakdown torque Tmax Slip smaxT

Slip smaxT


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Curve


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Slip-torque curve

Rotor


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Electrical Transient

Stator

Transformer voltage Stator Speed voltage Rotor

Stator:

Rotor:

Note :


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Flux linkage Rotor


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rmsStator


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rms

Transient time constantRotor

Time constant Stator


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Transient

rms


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rms t

Induction Machine Dynamics

Speed-torque curve

Curve

Rotor


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Curve

Mechanical radian

Integrate

Curve

Upper limit

Integrate


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Speed-time curve


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  • 2-

2-


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Speed-torque curve 2-


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Self-synchronous


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Torque-angle


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Maximum torque


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Single-phase Instrument Types


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Synchro Control Transformers


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6.1, 6.4, 6.7, 6.8, 6.9, 6.16


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