Question 245Electricity/Electronics - QMED70% to pass
What is the function of the commutator associated with a DC motor?
AI Explanation
The correct answer is D) allow current flow in the armature windings under a given pole to be in the same direction at all times.
The commutator in a DC motor functions to maintain the direction of current flow in the armature windings as the armature rotates. This ensures that the current flow through each armature winding is always in the same direction relative to the magnetic field, which is necessary to generate a continuous rotational torque.
The other options are incorrect because they do not accurately describe the primary function of the commutator. Option A is related to brush positioning, option B is about reducing magnetic reluctance, and option C is about reversing field pole polarity, none of which are the main purpose of the commutator in a DC motor.
Related Questions
#243 The torque produced by a DC motor armature is the multiplication product of two factors, one being the density of the magnetic flux which is dependent upon the field current. What is the other multiplication factor? #244 In DC motor construction, with regard to the individual armature coils' ends, which statement is true? #246 In DC motor construction, where are the commutating windings wound? #247 Which of the following statements describes what will happen when both the polarity of the field poles, and the direction of current to the brushes of a DC motor are reversed? #248 The counter EMF of a DC motor is maximum when the _______________.