Electrical DC Servo Motors:Speed Torque Characteristic of DC Servo Motors

Speed Torque Characteristic of DC Servo Motors

One of the important properties of DC motor is its speed torque characteristic. Ideally when the voltage is connected to the motor, it must provide a constant torque to accelerate the rotor and when the required speed is reached the torque must become zero. This is shown in Fig. 4.5

The important property of DC servo motor is its speed torque characteristic. The voltage equation ignoring the inductance may be written as,

The values of Kt is the motor torque constant and is defined by manufacturers. When a voltage is applied initially, the speed is zero and a large current flows through the armature and it produces a large torque to accelerate the rotor. As speed is gradually increased, the current/torque reduces until the steady speed is reached. The initial large current is almost ten times of its rated power. This is shown for various speeds in Fig. 4.6.

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