Stopping noise reduction circuit for start motor using resistor

• Main Authors: AHN, HYUNUL, PARK, SOON-SIK, KIM, CHANG-IL, KIM, JI-GON
• Format: Patent
• Language: English; French; German
• Published: 21.04.2010
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDEDFOR; STARTING OF COMBUSTION ENGINES; WEAPONS

There is provided a stopping noise reduction circuit for a start motor using a resistor. This stopping noise reduction circuit for a start motor including a battery for generating a power to drive the start motor, a key switch for controlling an on/off of the power supply from the battery, and a solenoid having a permanent magnet, P and H coils, and a movement contact to drive the start motor, comprises a B1 terminal earthed inside the solenoid, an M1 terminal connected to an M terminal of the start motor, and a resistor is coupled with the B1 or M1 terminal, wherein, upon an off of the key switch, the movement contact of the solenoid is connected to the B1 and M1 terminals such that more induced current than an induced current flowing into the P and H coils inside the solenoid, in a current induced by a rotator of the start motor, is flowed into the earth via the resistor within a short time. With the novel stopping noise reduction circuit of the invention, a stopping noise can be reduced maximally to the extent that the user cannot recognize by freely adjusting a stopping time of the rotator in the start motor by making that the resistor with less value than that of the serial circuit by the P and H coils inside the solenoid is connected to two terminals separately arranged within the solenoid such that an induced current made by the rotator of the start motor is flowed into the earth by the way of the resistor after the two terminals are coupled via the movement contact upon an off of the key switch. Moreover, the present invention can prolong the endurance life span of brush and bearing inside the start motor by making the total rotational time of the start motor shortened by the reduction of the flow time of the induced current via the resistor.