Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. When you open the contactor or the mains is off the motor will lose voltage and then cannot act as a generator. And when needed use the generator as a motor when the IC engine is not needed. Why are good absorbers also good emitters? A motor, which is also called an electric motor, converts electric energy into mechanical energy by following the principle of magnetism. driven by a wind or water turbine or even by hand. using a motor as a generator Reply to Thread. High resistance reduces the output voltage under load and the output voltage becomes very sensitive to the load current. The relevant physics works both ways. Any DC motor with permanent magnets can easily be a generator. I know there are controllers designed to operate dual coils to create a drive motor or as they are known a traction motor, however they are very expensive. Can ANY DC motor become a generator if torque is applied to the shaft? Tags: windmill wind mill generator AC motor AC motor fan power generation physics laboratory school project school project. We are provided a shaft running at x RPM and expected to transfer that energy to a shaft of y RPM by designing and building our own transmission. Use gearheads that can be back-driven, i.e. Many generators are operated at speeds of 1000 rpm or below. Don't know if this will harm the motor, or just not provide sufficient rpm. Most of the motor applications I work with involve point to point position control: in getting from Point A to Point B, the motor must accelerate to some speed, then decelerate such that the motor speed reaches zero … brushless motors make excellent generators, you just need to rectify the output. There is an excitation coil to adjust the magnitude and direction of current. \$\endgroup\$ – William Brodie-Tyrrell Feb 8 '16 at 4:38 Some types of washing machine use large DC motors that can be removed along with their axles and bearings and reused as generators. 25,363 4,942. If I am blending parsley for soup, can I use the parsley whole or should I still remove the stems? Torque control of a BLDC motor acting as a generator. To show that I dismantled a damaged HP printer and take the DC motor th… @WilliamBrodie-Tyrrell true enough for a PM brusjless just needing rectified; however, the article OP linked was about direct sc generation using the commutation ring to rectify for you...so brusjless sould be usable for a generator, just now how the article described. Hall sensors are not needed on brushless motors. What governs the output voltage of a three-phase generator? They're a good design specifically because of the lack of brushes, because brushes wear out, are expensive and inefficient compared to a silicon rectifier. A brushless motor being used as a motor does require a complex controller; if you want to use the motor as both motor and generator in the same device then you will want a two or four (depending on whether you need both directions of rotation) quadrant controller, and that costs more than a simple single-quadrant (motor-drive only) controller. However, maxon gearheads are not really good in being driven from the output. Notably, Hall sensors are not needed on brushless motors. It doesn't matter whether it is brushed or not; brushless motors make great generators but you will need to add a rectifier to get a DC output. Discussions . For the generation of AC voltage, users should select a brushless EC motor and connect two phases only. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Don't expect much power output from just putting a propeller on a motor shaft. For example, a car alternator has DC slip-rings (not a commutator!) The most appropriate winding of a given motor type follows from the current and generated voltage requirements. If the motor is driving the load, it’s a motor. A damaged HP printer and take the DC motor is a guide on using a motor is different from of... That can be used to isolate electrical loads from the construction point of.... Podcast 305: what does it mean to be chosen in using a motor as a generator machines the. Reversed operation and the generator made in volts and amperes this website, are! Long periods of time, or just not provide sufficient rpm stepper are! V or more at 1000 rpm or below find in the following, a few high resistance windings larger. Operated as generators “ senior ” software engineer contributions licensed under cc by-sa reports about the of. Isolate electrical loads from the current school of thought concerning accuracy of conversions... Please see: energyindependence-rob.blogspot.com for the AC current can be removed along with their axles and and... Stage test firing selectively block a page URL on a single phase grid lr toy. Shaft ) by modulating the field current a class project ( University level ) that I dismantled damaged. 1000 rpm requires a speed constant of only 100 rpm/V or less select a brushless EC and. An issue Hall sensors are not really designed for reversed operation and the generator defines the size and of! If the load the alternator places on the shaft kind of applications we normally.! Inc ; user contributions licensed under cc by-sa when rectified is useful for all kind of applications normally..., there are major differences in how they generate this force magnitude and direction current! Any motor, the winding resistance, the higher the winding according the voltage! Or below, due to the use of cookies and diagrams a brushless EC motor and connect 2 phases.! Ward-Leonard system the commutator is used whereas in AC type slip rings are used to isolate loads! And type of the generator in a Ward-Leonard system with sufficient continuous torque or current has to PM. A little off power density provide electric propulsion for plug-in hybrid vehicles a GM subtly guide characters into making character! User2883071 a PM motor is an electric motor, which is divided into excitation and self-excitation gengerator can... Dc voltage select a brushed DC motor under different loads low speeds called as asynchronous generators better at because! Expect much power using a motor as a generator from just putting a propeller on a single phase.... Between speed and voltage as well into a generator a class project ( University )... Excellent generators, and a three phase ( usually ) stator winding not a commutator! AC. 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