Lenze MCH Series Bedienungsanleitung PDF herunterladen (Seite 21)

13435744_EDBMH01_v13 17

CONSTANT TORQUE

CONSTANT HP

TORQUE HORSEPOWER

HORSEPOWER

TORQUE

FREQUENCY (Hz)

TORQUE (%)

20 40

60 80 100 120

150

130

110

6.1.1 VARIABLE TORQUE VS. CONSTANT TORQUE

Variable frequency drives, and the loads they are applied to, can generally be divided

into two groups: constant torque and variable torque. Constant torque loads include:

vibrating conveyors, punch presses, rock crushers, machine tools, and just about every

other application that is not considered variable torque. Variable torque loads include

centrifugal pumps and fans, which make up the majority of HVAC applications.

Variable torque loads are governed by the anity laws, which dene the relationships

between speed, ow, torque and horsepower. The following diagram illustrates these

relationships.

25%

50%

75%

100%

100%75%50%25%0%

% SPEED

% TORQUE

% HORSEPOWER

% FLOW

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 91 92

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Lenze MCH Series Bedienungsanleitung Seite 21