Hello electrical people, you already know about the different types of motors that are available today and in this article, I am going to talk about the different techniques used to restore a DC motor after stopping or disconnecting the supply. I will talk. Please note that the braking applied to stop the DC motor is electrical braking and not mechanical braking. In other words, the motor is stopped by voltage and current action in the circuit rather than a mechanical friction brake on the rotor.
Basically, there are three types of electrical brakes applied in a DC motor:
- Regenerative Braking.
- Dynamic Braking.
It is a type of slowing down wherein the dynamic energy of the engine is gotten back to the power supply framework. This kind of slowing down is conceivable while a moving burden powers the engine to run with steady excitation at a speed higher than its no-heap speed.
The engine back emf Eb is more prominent than the inventory voltage V, which switches the course of the engine armature current. The engine turns over filling in as an electric generator.
It is fascinating to take note of that regenerative slowing down can’t be utilized to stop the engine yet to control its speed over the no-heap speed of the engine driving the diving load. Is.
2: Dynamic Braking
It is also called Rheostatic easing back. In such deceleration, the DC motor is decoupled from stock and a deceleration resistor RB across the armature is instantaneously connected. The motor will now run as a generator and produce idle power.
During power failure when the motor operates as a generator, the kinetic energy is stored in the winding flux of the motor and the corresponding load is converted into electrical energy. It spans the resistor RB and the armature circuit impedance Ra as a reduction limit.
Dynamic deceleration is an inefficient method of deceleration because all the generated energy is dissipated as power in conservation.
It is otherwise called switch current slowing down. The armature terminals or supply extremity of an independently energized DC engine or shunt DC engine while running are switched. Thusly, the stockpile voltage V and the actuated voltage Eb for example back emf will act in a similar heading. The compelling voltage across the armature will be V + Eb which is two times the stock voltage.
Subsequently, the armature current is switched and a high slowing down force is created. Stopping is a profoundly wasteful technique for slowing down on the grounds that, notwithstanding the power provided by the heap, the power provided by the source is squandered in protections.
It is utilized in lifts, print machine and so on.
These were the super three sorts of slowing down procedures liked to stop a DC engine and utilized generally in modern applications.