- Tytuł:
-
Wpływ sposobu zasilania na własności dynamiczne silników prądu stałego, zasilanych z impulsowych przetworników energii
Impact of supply method on dynamic properties of DC motors fed by impulse energy converters - Autorzy:
- Fręchowicz, A.
- Powiązania:
- https://bibliotekanauki.pl/articles/1373852.pdf
- Data publikacji:
- 2009
- Wydawca:
- Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
- Tematy:
-
silnik prądu stałego
wózek inwalidzki
hamowanie - Opis:
- Modern electric servodrives are equipped with standard or brushless dc motors and PWM transistor converters. The designers must utilise motors electric braking if high demands on motors’ dynamics are to be met. It often happens that during coasting, real speed does not keep up with quickly decreasing set speed. In case of electric braking, the controllers change motor current direction. Motor goes into braking mode, and controllers operate in such a way, that real system speed keeps up with decreasing set speed. Additionally it is required that transmission from driving to braking modes and reversing should be achieved smoothly, without jerks or overshooting. Dc machines can brake in two different ways: utilising counter-current mode and dynamic braking mode. In both modes, when braking current is flowing, the valves are switched off and braking current transfers system’s energy back to the supply source. From the design point of view, these drive systems may be divided into two basic categories. The first class consists of drives where PWM period may be apportioned into two time intervals: one, when the system operates in driving mode, the other, when it operates in braking mode. Depending on pulse-duty factor, the system operates as drive or brake. Change of energy flow direction does not necessitate switching the circuit structure. The second class of drives comprises systems operating as drives or brakes and change of operation mode is achieved by switching circuit structure. Four different designs of dc drives are presented in the paper, combining both braking modes and both drive classes. Merits and faults of these systems are shown.
- Źródło:
-
Maszyny Elektryczne: zeszyty problemowe; 2009, 82; 209-215
0239-3646
2084-5618 - Pojawia się w:
- Maszyny Elektryczne: zeszyty problemowe
- Dostawca treści:
- Biblioteka Nauki