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An electrical actuator that converts electrical energy into rotational motion or sustained linear motion (linear motor). There are many types of electric motors. If the specific type of motor is known, it is helpful to use or add a more specific tag, such as dc-motor, brushless-dc motor or induction-motor.

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. Imagine a synchronous motor run like an induction motor - you can easily do this by shorting the rotor slip rings. When first powered, the motor generates tons of torque because the induction into the … rotor is 50Hz and this generates a field that causes the motor to start to turn. As it turns the "slip frequency" gets less and less until it is a few Hz - it reaches equilibrium somewhere close to (but …
answered Mar 19 '14 by Andy aka
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If interpoles are used in DC Motors and reduced the entire armature flux then how is torque induced in the motor? Interpoles only reduce/alter flux around where the commutator/brushes are …
answered Aug 20 '14 by Andy aka
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Contact-less phone chargers use magnetic field coupling between the charger base and the "thing" to be charged and a few watts of power are easily transferable. This can easily activate a small motor … . This relies of course on something being attached to the motor but if you truly "do not know anything about the motor" then that is likely to prove the killer because the motor may be stalled mechanically, broken etc.. Maybe you need to clarify this. …
answered Mar 17 '15 by Andy aka
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Due to the environment, it sounds like you need one of these (Residual current detector): - This detects a difference in current between the two AC wires and trips the contacts breaking the circuit …
answered Aug 14 '13 by Andy aka
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It's impossible to read the supply voltage on the LM324 but, assuming it is 12 volts i.e. common to the voltage rail on the H bridge, you'll never properly turn-off the top MOSFETs because, the LM324' …
answered Apr 22 '15 by Andy aka
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When you stall a dc motor you get stall current and this is usually several times full rated load current. Because the motor is no longer spinning, the natural back-emf isn't present and the full 9 … battery is regarded as a source of voltage then power into the armature resistance is stall current squared multiplied by R. It can easily burn a motor but, for a feeble little 9 volt battery, there's …
answered Oct 9 '16 by Andy aka
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Item 1 - The L293 has two H bridges and is a chip. Item 2 - The Ada fruit product is a circuit board with two chips and each chip has a single H bridge. Item 1 and item 2 are functionally very sim …
answered Feb 25 '15 by Andy aka
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Why not use a 5V relay and put a resistor dropper in series with the coil. A 5V relay is much more common than a 9V relay and probably about as common as a 12V relay so, getting hold of a 5V relay wi …
answered Jun 3 '14 by Andy aka
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The speed of a three phase induction motor is determined by the number of poles and the operating frequency: - Synchronous Speed = \$\dfrac{2\times 60\times F}{N}\$ where F = frequency and N is … number of poles. The motor in the question has four poles based on the operating frequency stated. They don't run at synchronous speed but slightly less in order to actually induce current in the rotor …
answered Nov 1 '13 by Andy aka
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When an induction motor has its rotor locked, the "slip frequency" is at its highest. Given that the rotor is a shorted inductor that receives "slip frequency" as part of the induction process, the inductive reactance is highest and the current in the rotor is going to be non-maximum. …
answered May 11 '15 by Andy aka
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. If you had a multimeter there is a very good chance that you would see the battery voltage progressively lower the longer you had the motor connected. …
answered Mar 11 '17 by Andy aka
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The L293D doesn't need anything connected to the enable pin(s) in order to enable it. Read the data sheet and look at diagram on page 3: - Until you start drawing current to ground from the input t …
answered Apr 1 '15 by Andy aka
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For a really good accurate system try a Linear Variable differential transformer. Here is a link. Here's the blurb from the supplier above: - LVDT's are inductive displacement transducers that ha …
answered Jul 24 '13 by Andy aka
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The diode will conduct when the switch opens allowing the magnetic energy stored in the motor to be dissipated and not cause a damaging arc across the switch. …
answered Mar 6 by Andy aka
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The windings in a 3 phase motor, when activated by a 3 phase supply produce a rotating magnetic field in the rotor area of the motor. Swapping phase A with phase B re-orders the fluxes so that the …
answered Aug 1 '15 by Andy aka

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