Speed Control Basics: VFD or Triac for AC Induction Motors?

When a voltage is applied to an AC induction motor, it runs at a certain speed.  Variable speed requirements for AC induction motors are typically fulfilled by a 3-phase motor and an inverter or VFD.  This blog post also introduces another option.

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Speed Control Basics: VFD or Triac for AC Induction Motors?

Why can't we use SCR voltage regulator speed controller instead of VFD to control the speed of an AC motor? - Quora

Speed Control Basics: VFD or Triac for AC Induction Motors?