File Name: difference between dc generator and dc motor .zip
Since our motors are very efficient, this is also true when operated as generators. The basic calculations between speed and voltage as well as current and torque are very simple. In the following, a few rules for a successful selection. For the generation of AC voltage, select a brushless EC motor and connect 2 phases only.
Hall sensors are not needed on brushless motors. Many generators are operated at speeds of rpm or below. Such windings are hard to find in the maxon portfolio. There are only a few high resistance windings on larger motors that satisfy this requirement. Smaller motors have higher speed constants. As an alternative, the motor speed can be enhanced by the use of a gearhead see below.
Rule 2 requires motors with high generator constant. Unfortunately, these windings have the highest resistance as well. High resistance reduces the output voltage under load and the output voltage becomes very sensitive to the load current.
Rule 3: For stable output voltage over a certain load range, select rather a larger motor where the resistance is lower even on motors with high generator constant. The EC-i 40 High Torque motors are very interesting from this point of view. Do not select the motor-generator on power considerations alone. In order to fulfill the torque requirements, you might need a motor with a much higher power rating than the generated power; in particular if the generator speed is rather low compared to typical motor speeds.
The amount of torque on the generator defines the size and type of the motor-generator. Select a motor type with a continuous torque higher than the generator torque. When calculating the torque or current load, consider the type of operation. Will the generator run continuously for long periods of time, or in intermittent operation cycles, or during short intervals only? Accordingly, a motor size with sufficient continuous torque or current has to be chosen.
Also respect the maximum speed of the motor type. However, due to the generally low speeds this is hardly ever an issue. The most appropriate winding of a given motor type follows from the current and generated voltage requirements. Select a winding that can generate the required voltage U even under load. Assuming a fixed generator speed n, we require a generated voltage of the winding Ut that is larger than U.
Without considering the load, select the speed constant according to Rule 2, i. Since the current capacity decreases with increasing resistance, verify that the continuous current is still large enough. These contradictory effects can be eliminated to a certain extent by selecting larger motors that exhibit lower resistances for the same generator constant according to Rule 3.
Rule 4: Use gearheads to increase very low speeds. However, maxon gearheads are not really good in being driven from the output. Use gearheads that can be back-driven, i. Or specially designed gearheads. The reason for using gear-motor combinations is the very slow driving mechanism in generators; e. A few observations and recommendations:.
DC motors as Generators. Home Search. Felix Herger. Urs Kafader. Robin Phillips. Angelica Perzan. Juergen Wagenbach. Jessica Kang. Both brushed and brushless DC motors can be operated as generators. However, there are some important points to consider when designing the drive. Urs Kafader Head of Training at maxon. DC or AC voltage? Speed constant kn Many generators are operated at speeds of rpm or below. Resistance Rule 2 requires motors with high generator constant. Power restrictions Do not select the motor-generator on power considerations alone.
Torque and speed limitations The amount of torque on the generator defines the size and type of the motor-generator.
Current and voltage limitations The most appropriate winding of a given motor type follows from the current and generated voltage requirements. Assuming a fixed generator speed n, we require a generated voltage of the winding Ut that is larger than U Without considering the load, select the speed constant according to Rule 2, i. The higher the winding resistance, the higher the generated no-load voltage. However, the higher the winding resistance, the more sensitive the generated voltage becomes to load current changes.
Gear-motor combinations Rule 4: Use gearheads to increase very low speeds. A few observations and recommendations: The gearheads need to be driven in reverse operation in these cases. However, maxon gearheads are not really designed for reversed operation and the efficiency is low. High reduction gearheads 3 stages and higher are not back-drivable; i. You may use 1 or 2 stage planetary gearheads; they can be operated from the output. Rather use spur gears instead of planetary gearheads. Spur gearheads can more easily be back driven and the back-driving efficiency generally is higher.
Related content. Worried about EMI? Make sure your DC motor selection is not working against you. Read article. Complete mechatronic drive solutions offer many advantages over individual components.
General Information: Emergency Contact: Email: contactus powerplus. Is your business in need of an AC generator or a DC backup generator? Can you tell the difference between the types of generators available on the market and which one best fits your needs? Here is what you need to know so you can invest in the right generator for your business. In order to determine which generator you need, you should understand a few things first.
Electrical Academia. DC motor and DC generator are similar from the mechanical perspective, however from a technical stand point, both differ from each other significantly. The most significant difference between DC motor and DC generator lies in the conversion mechanism. DC motor converts electrical energy into mechanical energy whereas DC generator converts mechanical energy into an electrical energy. You May Also Read:. Want create site? Find Free WordPress Themes and plugins.
The Electric Motor and Generator are differentiated on various factors like the main principle of working or function of the motor and generator. Consumption or production of electricity, its driven element, the existence of the current in the winding. The Difference Between the Motor and the Generator are explained below in the tabulated form. The motor and the generator are almost similar from the construction point of view, as both have stator and rotor. The main difference between the two is that the Motor is an electric device which converts electrical energy into mechanical energy. The generator is vice versa of that motor.
The initial electromagnetic generator Faraday disk was invented by British scientist namely Michael Faraday in the year A DC generator is an electrical device used for generating electrical energy. The main function of this device is to change mechanical energy into electrical energy.
A dc generator is an electrical machine which converts mechanical energy into direct current electricity. This energy conversion is based on the principle of production of dynamically induced emf. This article outlines basic construction and working of a DC generator. Note: Theoretically, a DC generator can be used as a DC motor without any constructional changes and vice versa is also possible. These basic constructional details are also valid for the construction of a DC motor. Hence, let's call this point as construction of a DC machine instead of just 'construction of a dc generator'.
A DC motor is any of a class of rotary electrical motors that converts direct current electrical energy into mechanical energy. The most common types rely on the forces produced by magnetic fields. Nearly all types of DC motors have some internal mechanism, either electromechanical or electronic, to periodically change the direction of current in part of the motor. DC motors were the first form of motor widely used, as they could be powered from existing direct-current lighting power distribution systems.
Electric motors play an essential role in almost every industry. Using the right type of motor with high-quality parts and regular servicing keeps your facility running smoothly and prevents damage to the endpoint equipment due to wear or power surges. Gainesville Industrial Electric can help your company select the right industrial electric motors and parts for your applications. Electric motors are machines that convert electrical energy—from either stored power or a direct electrical connection—into mechanical energy through the production of rotational force. The two major types of electric motors are:.
ГЛАВА 19 - А вдруг кто-то еще хочет заполучить это кольцо? - спросила Сьюзан, внезапно заволновавшись. - А вдруг Дэвиду грозит опасность. Стратмор покачал головой: - Больше никто не знает о существовании кольца.
Глаза ее были полны слез. - Сьюзан.
Невзламываемый шифр. Но это полный абсурд. Неужели Хейл никогда не слышал о принципе Бергофского. - Вот что нам надо сделать. - Стратмор начал спокойно излагать свой план.
Увы, - сказал Нуматака, которому уже наскучило играть, - мы оба знаем, что Танкадо этого так не оставит. Подумайте о юридических последствиях.
Но, сэр, мутация… - Немедленно! - крикнул Стратмор. Чатрукьян некоторое время смотрел на него, лишившись дара речи, а потом бегом направился прочь из шифровалки. Стратмор повернулся и с удивлением увидел Хейла. Сьюзан поняла, в чем дело: все это время Хейл вел себя тихо, подозрительно тихо, поскольку отлично знал, что нет такой диагностики, в которой использовалась бы цепная мутация, тем более такая, которая занимала ТРАНСТЕКСТ уже восемнадцать часов.
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