Motor (pinhole) salt water test is a test method commonly used by motor manufacturers. The usual method is to use pure water or boiled water to make a saline solution with a concentration of about 0.2%,
The DC internal drive brushless motor is composed of the motor and the built-in driver. In order to reduce the cost and simplify the circuit design of the built-in driver board, a relatively economical method is often used to realize the motor drive.
When a BDLC motor turns, each winding develops a back electromotive force voltage (BEMF) which, according to Lenz's law, is in the opposite direction to the main voltage supplied to the windings.
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