| 摘要 |
<p>357,421. Maintaining equal and proportional speeds of motors. WESTING- HOUSE ELECTRIC & MANUFACTURING CO., East Pittsburg, U.S.A.-(Assignees of Staege, S. A. ; 6624, Beacon Street, Pittsburg, U.S.A.) Nov. 21, 1930, No. 35089. Convention date, Nov. 21, 1929. [Class 38 (iii).] A number of motors, some of which are arranged in groups, are so controlled as to maintain a predetermined speed relationship between the grouped motors, and the remainder, and also substantial synchronism between the groups. Groups of motors 1 .. 4 driving, for example, the drying rolls of a paper-making machine, are maintained in synchronism by mechanically connecting with one of the motors of each group, a wound induction motor 27, and electrically connecting the rotors of the motors 27 associated with adjacent groups. Groups 2 and 4 each have an additional wound rotor induction motor 28 which is similarly connected. The stators of the motors 27, 28 are supplied from a common source 29, 30, 31, of any frequency. All the grouped motors are supplied from a single alternator driven by one of a number of direct current section motors, which are maintained in proper speed relationship by field resistance, coned pulleys, nut regulators, rotary interrupters, and synchronous motors in the ordinary way; the coned pulleys of the motor driving the alternator which supplies the ground motors, being driven in accordance with the speed of the dryer rolls.</p> |
