| 摘要 |
The digital system proposed according to the invention helps to increase the functional reliability and the accuracy in regulating current in an electrical motor and to improve its energy-related characteristics. The digital regulation system according to the invention comprises a pulse converter 2, a device 1 for controlling the change-over switch in the pulse converter 2, a power sensor 3, an analogue-digital converter 7, a unit 5 for digital pre-setting of the current and a code comparison unit 6. The system according to this invention is characterized by comprising in addition a so-called change-over delay unit 8 and a beat pulse generator 9. The current sensor 3 is intended to generate a signal proportional to the current (the current strength) which is converted by the analogue-digital converter 7 and transmitted to the code comparison unit 6 where it is compared with a signal which comes from the unit 5 for digital pre-setting of the current in the form of a binary code. The comparison of the signals Ka and KD results in the creation of logical signals Y1 and Y2, of which the signal Y1 is a signal which is intended to pre-set the polarity of the voltage Em which is created by the pulse converter 2, while the logical signal Y2 is intended to pre-set the level of the voltage Em. By transmitting the logical signals Y1 and Y2 the device 1 for controlling the change-over switches in the pulse converter 2 pre-sets an asymmetrical layer or layer bottom unit for switching the change-over switches in the pulse converter 2 and also the required time delay which is created by transmitting the signals Y4 and Y5 which come from the output of the change-over switch delaying device 8. The beat pulse generator 9 is intended to generate two time-displaced sequences of pulses T1 and T2. <IMAGE> |
