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Registered Member #61923
Joined: Tue Nov 21 2017, 03:27PM
Location: NW Montana USA
Posts: 11
Im wondering if there's a (easy & safe) way to vary the speed of my ARSG motor? Ive got two options for motors, the first is a dyson vacuum motor (est. 15,000rpm) & the 2nd is a wood router motor (no load peak of 25,000 rpm). & would it be better to use a disc or propeller type rotor?
Registered Member #58522
Joined: Tue Mar 15 2016, 08:33PM
Location:
Posts: 50
For some types of non-synchronous motors, such as shaded pole motors used in hand tools like routers or angle grinders, you can use a TRIAC-based speed controller, e.g.
You can generally tell the difference because many synchronous motors have a start capacitor where a shaded pole motor generally doesn't.
These are available cheaply at Harbor Freight Tools for about $20. However, the motor can get hotter using a TRIAC controller because any cooling is also reduced, and the resistance on the motor should be minimized if running at a low speed. If you want to maintain higher torque at low speeds, you are better off using a DC motor and PWM control.
Registered Member #61923
Joined: Tue Nov 21 2017, 03:27PM
Location: NW Montana USA
Posts: 11
Thank you again Dan, im still trying to figure out the java program😒 but i put a bigger top load on my secondary coil & it brought it down to 297.5khz. Anyway ill keep you posted on my ongoing project. Thanks again
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Power tool motors are NOT shaded pole! Shaded pole is a kind of induction motor (or, rarely, permanent magnet synchronous motor) that won't go faster than 3600 RPM without a variable frequency drive.
Corded tool motors with brushes, as found in routers and angle grinders, drills, and vacuum cleaners, are generally series-wound universal motors. No capacitors needed; the phasing between rotor and stator is set by the commutator wiring and brush position. They can be slowed down with triac-style "dimmers", as others have mentioned.
If the Dyson vacuum cleaner motor is brushless, it might be one of their variable reluctance motors. Like the brushless motors in many RC models and electric cars, it depends on an electronic speed control circuit. I think it's wrong to call them brushless DC motors, because the motor receives variable frequency AC power from the ESC.
Registered Member #11591
Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
klugesmith wrote ...
Power tool motors are NOT shaded pole! Shaded pole is a kind of induction motor (or, rarely, permanent magnet synchronous motor) that won't go faster than 3600 RPM without a variable frequency drive.
Corded tool motors with brushes, as found in routers and angle grinders, drills, and vacuum cleaners, are generally series-wound universal motors. No capacitors needed; the phasing between rotor and stator is set by the commutator wiring and brush position. They can be slowed down with triac-style "dimmers", as others have mentioned.
If the Dyson vacuum cleaner motor is brushless, it might be one of their variable reluctance motors. Like the brushless motors in many RC models and electric cars, it depends on an electronic speed control circuit. I think it's wrong to call them brushless DC motors, because the motor receives variable frequency AC power from the ESC.
+1 The only shaded pole motors I've seen are <20W devices in things like peristaltic pumps. They do exist in higher powers, but they are large and inefficient, if simple.
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Is there a way to vary the speed of an ARSG motor w/out a variac
