6.5.1. Direct current motor with permanent excitation
The permanently excited direct current motor is a small machine in which the exciter field is established through permanent magnets.
Dependence of current take-up on the torque (load)
As the curve I = f (M) indicates in Figure 105, current take-up is directly proportional to the torque because of the constant exciter flow.
Dependence of speed on the torque (load)
Direct proportionality exists between speed and torque in speed-load behaviour.
Speed control ensues by changing the applied voltage.
Direct current motors with permanent excitation are used mainly for power ratings up to 500 W. Such motors find application in the toy industry, household appliances, measurement and control technology.
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