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1. 发明专利

GB392981A Improvements in and relating to electric motor controllers 未知
公开(公告)号：GB392981A
公开(公告)日：1933-06-01
申请号：GB3342631
申请日：1931-12-02
申请人： RODERIC MERVYN LLEWELLYN EVANS , ASS ELECT IND
IPC分类号： H02P1/06
摘要： 392,981. Drum controllers. EVANS, R. M. L., Roselands, Harboro' Road, Ashton-on- Mersey, and ASSOCIATED ELECTRICAL INDUSTRIES, Ltd., Crown House, Aldwych, London. Dec. 2, 1931, No. 33426. [Class 38 (iii).] A controller comprises a main drum 1 actuable to various positions on either side of a zero by a handle 21, and retained in such positions by a notched plate 22, which may be devoid of notches at the two extreme positions, so that the drum is returned to an intermediate position by a spring 35 when the handle 21 is released from an extreme position. An auxiliary drum 2 is urged away from its zero position by a weighted lever 62, but is restrained from movement by a roller 71 thereon engaging a cam 70 of the drum 1, until the drum 1 is displaced, and is returned to zero when the drum 1 is returned to zero. The speed of movement of the drum 2 is limited by a pendulum escapement device 82, 86. Movement of drum 2 from its zero position can be prevented by a coil 100 energized by the back E.M.F. of the motor, so that upon sudden reversal of the drum 1, the drum 2 cannot move from its zero position until the motor has slowed down sufficiently. The drum 1 may prepare the armature and field circuits and effect release of a brake, and the drum 2 may connect the circuits to the power supply, exclude resistance, and in the extreme positions cause field weakening.

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