Abstract: A waterproof connector for a vehicle includes a front holder mounted on a front side of a main housing via a front seal for watertight, and having terminal-connecting holes. The front seal and the front holder are disposed inside the first mounting hole sequentially. An inner housing with a terminal is mounted to a rear side of the main housing and has terminal insertion holes. A subcover is disposed at a rear side of the inner housing. Each terminal has a connector portion disposed inside a terminal-connecting hole of the front holder, and a wire-welding portion is disposed inside a terminal insertion hole of the inner housing. Watertight and vibration-absorbing materials are attached to a lower side of an upper cover and an upper side of a lower cover of the subcover to protect the wire-welding portions of the terminals.

Abstract: A waterproof connector for a vehicle includes a front holder mounted on a front side of a main housing via a front seal for watertight, and having terminal-connecting holes. The front seal and the front holder are disposed inside the first mounting hole sequentially. An inner housing with a terminal is mounted to a rear side of the main housing and has terminal insertion holes. A subcover is disposed at a rear side of the inner housing. Each terminal has a connector portion disposed inside a terminal-connecting hole of the front holder, and a wire-welding portion is disposed inside a terminal insertion hole of the inner housing. Watertight and vibration-absorbing materials are attached to a lower side of an upper cover and an upper side of a lower cover of the subcover to protect the wire-welding portions of the terminals.

Abstract: A brushless direct current motor driving circuit includes a data generator adapted to receive a first signal corresponding to a rotor position and to generate a digital data signal therefrom, a clock signal generator adapted to receive phase voltage signals and back electromotive force (BEMF) signals from a motor and to generate a clocking signal therefrom, and a data output block coupled to the data generator and the clock signal generator and adapted to receive the data signal and the clocking signal such that the digital data is clocked into the data output block as a result of the BEMF signals to produce a frequency signal to be used in controlling the velocity of the rotor. Switching noise present together with the BEMF signals is rejected by the clock signal generator so that the frequency signal is substantially free from switching noise, thereby allowing a velocity controller to provide more precise velocity control of the rotor.

Abstract: A start-up circuit for a sensorless, brushless DC motor modifies a conventional start-up circuit to include an intermittently-accelerated-rate clock generator for supplying a clock signal intermittently accelerated in rate to a shift register that is connected as a ring counter for selectively generating three-phase commutation signals during start-up and six-phase phase commutation signals during running. The intermittently-accelerated-rate clock generator facilitates the start-up circuit increasing the magnitude of a back electromotive force by adjusting the rate of a starting clock during start-up of the motor, so as to be capable of both a normal start-up with a normal-rate clock signal and an accelerating start-up with an accelerated-rate clock signal. This permits a stable and rapid start-up without need for a microprocessor or complicated circuitry.