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Ningbo Shengguang Motor Co,. Ltd.
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Technical Knowledge
This is the second important characteristic of a D.C. motor.It is linear and is used to calculate the no-load current and the currentwith the rotor stationary (start-up current)
The graph for this relationship does not vary with the supply voltage
of the motor. The end of the curve is extended in accordance with the torque and the start-up current .
This torque constant is such that::C=Kc(I-Io) The otational friction torque is Kc. Io. The torque is therefore expressed as follows :C=Kc. I-Cf Cf=Kc. Io
Kc = Torque constantr (N.m/A) C = Torque (N.m)
Cd= Start-up Torque (N.m) Cf = Rotational friction torque (N.m)
I = Current (A) Io = No-load current (A) Id = Start-up current (A)
The gradient of this curve is called the "torque constant" of the
The graph for this relationship does not vary with the supply voltage
of the motor. The end of the curve is extended in accordance with the torque and the start-up current .
This torque constant is such that::C=Kc(I-Io) The otational friction torque is Kc. Io. The torque is therefore expressed as follows :C=Kc. I-Cf Cf=Kc. Io
Kc = Torque constantr (N.m/A) C = Torque (N.m)
Cd= Start-up Torque (N.m) Cf = Rotational friction torque (N.m)
I = Current (A) Io = No-load current (A) Id = Start-up current (A)
The gradient of this curve is called the "torque constant" of the
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