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Wazit asked Dose anyone out there know of any other way to reverse polarity other than using a switch?
It has been 20 some years sense I had any electrical theory. My question refers in part as what happens when an alternator is turned in the reverse direction? And what if an induction coil is wound in a different direction? I am trying to make a solenoid that has a PM in it. I want to actuate it in both directions, supplying force to both. Thanks for your input.
And got the following answer:
What you are describing is a type of electro-mechanical linear actuator. You can use a loudspeaker to demonstrate the concept - it has a solenoidal coil that moves axially relative to a cylindrical magnet that produces a radial magnet field. The radial field is perpendicular to the electric current in the coil, causing a force perpendicular to both, i.e. in and out along the longitudinal axis of the coil and magnet. If you apply a DC voltage to a low-frequency speaker, i.e. a woofer, you can see the cone move in or out depending on the polarity of the voltage applied. Try it with a six-volt battery. To answer your specific questions: - when an alternator is turned in the reverse direction it produces the same AC output, except the phases are reversed. In a single-phase alternator there is no effective difference unless you track to phase relative to an independent reference. In a three-phase alternator the relative phase timings are reversed so if you are driving a 3-phase electric motor, for example, it will turn in the opposite direction. - if an induction coil is wound in the opposite direction, the polarity of the voltage it produces will be reversed. Edit: I forgot to answer your first question: how to reverse polarity other than using a switch? You have some choices: - discrete switching (ON or OFF) using mechanical contacts (such as switches or electromechanical relays) or electronic switches (such as transistors). Polarity is changed by switching the desired voltages in and out of the circuit or by routing the current flow. - pulse width modulation (PWM) where an electronic switch consisting of transistors, typically connected as an H-bridge, rapidly switches between positive and negative voltage sources. By varying the relative amount of time in each polarity, smooth bipolar control can be achieved with a minumum of wasted power. - continuously variable voltage (both + and -) using a potentiometer (bad idea for anything except tiny currents) or with a control voltage and a linear power-amplifier. The latter provides excellent performance at the cost of wasting roughly 50% of the available power as heat. P.S.. many linear actuators are actually closed-loop servomechanisms where a position sensor continually measures the position of the output, comparing the actual position with the set position, producing an error signal (negative feedback) that serves to correct the output position in spite of the non-linearity of the actuator's response. A loudspeaker is an example of an open-loop linear actuator. Its output is not corrected during operation - instead it is carefully designed and constructed to provide an approximately linear response over a limited set of operating conditions.