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What is the role of the freewheeling diode in a DC motor drive?
The terminal voltage of the motor may become negative due to the energy stored in the inductance of the armature winding. A freewheeling diode can be used to dissipate this energy in the load itself, thus preventing the terminal voltage from becoming negative.
What is motor freewheeling?
The term “freewheeling” (FW) is a term used to describe the use of a diode to snub the back EMF voltage spike that occurs when an energized coil has its voltage/current source turned off by the device driving the motor coil(the FETs of the ESC).
How does a freewheeling diode work in a circuit?
What is freewheeling diode? In motor control circuits, a diode known as the freewheeling diode is connected across motor terminals to allow for dissipation of energy stored in motor inductance and to provide for continuity of motor current when the SCRs are blocked. It also provides protection against transient over voltages.
How does a flyback diode work in an induction motor?
The Flyback diode makes inductor to draw current from itself in a loop until the energy is dissipated in diode and wires. When the current flow to an AC induction motor is suddenly interrupted, then the inductor tries to maintain increasing the voltage and the current by reversing polarity.
What makes a fly back diode an ideal diode?
An ideal flyback diode will have a very large peak forward current; capacity which helps in handling the voltage transients from damaging the diode, and inductor’s power supply is suited for reverse breakdown voltage and low forward voltage drop.
When to use a Zener diode as a flywheel diode?
The answer to When/why would you use a Zener diode as a flywheel diode (on the coil of a relay)? touches on this slightly, by showing a regular Diode in the above left configuration, while showing a Zener Diode in the right configuration.