Sometimes even reliable drill goes down. Statistics show that failures occur not so much in its mechanical, how many electrical parts. But if tips on restoration of cable, replacement of worn brushes, bad switch or the elimination of other simple malfunctions of home appliances posted a lot, including in the pages of “Modeller-designer” (see for example, № 9’95,6’96,2’97), what about more complex kinds of repair are not. In particular, there is a clear lack of material about the peculiarities of maintenance and feasible (in terms of home Studio) fixation of the rotor manifold of the engine, usually installed in the drills, wrenches and other manual tools.
Features of these, alas, are many. To understand them is hardly possible without understanding the device and principle of operation of commutator motors (Fig. 1). It is useful also to recall that in accordance with the laws of physics on a conductor carrying a current I in a magnetic field of strength H. the force F, whose direction is determined by the so-called left-hand rule. And if to judge under the simplified scheme, the greatest torque is generated when the contact potential is located exactly between the poles of an electromagnet.