| 摘要 |
1481358 Control of A.C. motors ROHR INDUSTRIES Inc 8 July 1974 [9 July 1973] 30163/74 Heading H2J [Also in Division B7] A magnetic suspension and propulsion system generally similar to that of Specification 1,385,212 is provided with means to independently vary the speeds of the pair of motors driving each vehicle, Figs. 1 or 5 (not shown), whereby one motor is made to travel faster than the other to cause the vehicle to be directed from one track on to a branch track. Each motor has the control system shown, which is similar to Fig. 3 of Specification 1,385,212 and has a speed control 150 responsive to the vehicle operator or an on-board computer, whereby the output frequency of an oscillator 130 is varied manually or by the computer in response to switch sensors on the track, Figs. 2, 3 or 4 (not shown). The computer calculates a desired speed (frequency) difference between the two motor control systems, according to the vehicle speed and the radius of curvature of the branch track, and adjusts either or both of the oscillators 130 whilst maintaining constant the voltage applied to the motors. |
