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In most cases, if you are varying the speed of an ac motor you need to have a variable frequency drive. If you introduce resistance into the circuit (i.e. using a light dimmer), you will reduce the torque-producing capability of the motor. AC variable speed drives can be quite inexpensive...
I have used Multisim and CircuitLogix and I like them both. They both have mixed-mode simulation which is ideal for interfacing analog and digital control circuits.
I teach electronics at a State College and have been using CircuitLogix for the past three years. During that time I've had about 200 students who have used the software in my courses, and they all like the user-friendly interface. SPICE-simulators are generally not too intuitive, but...
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