Reversible d. c. motor system
专利汇可以提供Reversible d. c. motor system专利检索，专利查询，专利分析的服务。并且A reversible D.C. motor system is energized from an A.C. source and provided with a reversible field excitation system for controlling the direction of rotation of the motor. The field excitation is provided by a field exciting winding energized by a half-wave rectifier arrangement, the output of which is selectable to energize the field winding by either positive or negative half-wave rectified A.C. with a capacitance connected across the winding to smooth out the half-wave energization and energize the winding from the capacitance when not energized by the rectified half-wave A.C. whereby a continuous current energization is provided to the field winding during normal operation. A threshold voltage breakdown means is connected reverse biased across the field winding and has a voltage breakdown threshold which is a predetermined percent above the normal maximum peak half-wave A.C. supplied by the rectifier, so that on cessation, for any reason, of supply of half-wave rectified, A.C. from the rectifier, such as during a deenergization of the field prior to reversal thereof for reverse motor operation, the magnetic inductively stored energy of the field is rapidly dissipated in the threshold breakdown means during breakdown thereof after the field winding has discharged into the capacitance to the point of having raised its voltage to the threshold value of the breakdown means. Operation of the motor is controlled manually by switching means having forward and reverse positions, and an intermediate braking position. In the latter position, dynamic braking of the armature is used to expedite its stoppage. Protective interlock circuits prevent energization of the armature when the field winding is deenergized and prevent applying reverse energization to the field winding before the motor has stopped. Other protective circuits prevent restarting of the motor until it is fully stopped and provide rapid deenergization of the armature under predetermined excess armature current conditions and deenergize the entire system should the excess current condition continue beyond a predetermined time.，下面是Reversible d. c. motor system专利的具体信息内容。
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2 无静耗电磁阀
