FIELD: electrical engineering; electric drives for portable actuating mechanisms in all industries.
SUBSTANCE: proposed device designed for use in electric drives of various actuating mechanisms such as dental drilling machines and portable units for drilling under transient conditions, as well as for engraving to set desired speed of dc drive motor and to hold it within comprehensive range has motor speed setting cascade in which transistor shorts out control resistor by means of its conductive emitter-collector junction in presence of working pulse thereby eliminating impact of motor armature control current on pulse length shaping control circuit; diode connected to mentioned resistor prevents ingress of negative wave of motor armature internal voltage in absence of control pulse thereby ensuring control voltage build-up across capacitor of speed maintaining cascade during space between control pulses.
EFFECT: reduced space requirement, enhanced economic efficiency and safety of device.
1 cl, 5 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| TIME RELAY | 2002 |
|
RU2208259C1 |
| ELECTRONIC RELAY WITH TRANSFORMER ISOLATION AND PROTECTION FROM CURRENT OVERLOAD | 2008 |
|
RU2360358C1 |
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|
RU2380828C1 |
| SINGLE-ENDED STABILIZED DC VOLTAGE CONVERTER | 0 |
|
SU1777212A1 |
| STABILIZED AXIAL-RADIAL DIRECT CURRENT GENERATOR | 2017 |
|
RU2649913C1 |
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|
RU2689211C1 |
| STABILIZED AXIAL-CONICAL DIRECT-CURRENT VALVE WIND GENERATOR | 2018 |
|
RU2688925C1 |
| SINGLE-CYCLE TRANSISTORIZED CONVERTER | 0 |
|
SU868949A1 |
| SINGLE-STAGE STABILIZED DC CONVERTER | 0 |
|
SU1714768A2 |
| CONTROLLED THYRISTOR A.C.VOLTAGE CONVERTER | 0 |
|
SU1181085A1 |
