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When driving the motor, the H-bridge alternates between drawing current to the different coils of the BLDC motor. This causes the current to fluctuate, thus causing a current ripple.
When driving the motor, the H-bridge alternates between drawing current from the power source and DC link capacitor, and cycling the current through the motor. This causes a current ripple.
Structure of a capacitor
A capacitor is a device that can store electrical energy. Taken simply, a capacitor consists of two conductive plates separated by an insulating material called the dielectric. The main structure is shown here:
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