“Dear editors! I recently bought in shop “Children’s world” microelectronical, but when I put it on the model of the torpedo boats, it is a day out of order. Please advise, can it be repaired and how?
Yuri Sergeyev, Kiev”.
“…The quality of microelectrodes depend largely on future athletic performance of the model. Is it still at the store counter to determine the reliability of an engine, will not fail if it is during the critical start?
Alexei Zhdanov, the city of Semipalatinsk”.
Such letters are not uncommon in our post. Because latent defects microelectrodes sometimes hinder the work of the Modeler. So the editor asked the chief of the laboratory of microelectromechanical MLM “Horizons” V. KHITRUK with a request to advise our readers how to determine the efficiency of such engines, without leaving your shop counter.
Microelectronical, commercially-available, although different in appearance and operational parameters, have basically the same principle of the structural arrangement. This is a two-pole electrical machine DC excitation from an external magnet (magnets). Treasury laminated anchor drum is assembled from electrical steel plates. The copper coil of insulated wire connected in a “triangle” or “star”. Power — brush unit mounted in the engine cover, and reglamenting cylindrical manifold is pressed onto the armature shaft.
Modification of individual units and details of microelectromechanical quite diverse. In particular, the distinctive feature of the engines of TIR and DP is the use of magnets in the form of bars of rectangular cross section alloys cobalt-based magnetic cores are encased in a plastic body, and lids made of polystyrene, glued to the body. Typical representatives of motors in a metal casing are a series engines ДИ1, they use a segmented ferrite-barium magnets. Polystyrene caps are mounted in the housing of these engines crimping legs. These motors can be easily disassembled and collected without compromising the integrity of the cover or housing.
You know in advance what kind of engine will fit in your model? If the load is small, good engines of the brand DP, if the average (0,4 -0,5 W) — МДП1 or ДИ1-2, with a power of over 0.6 W — engines of the brand ДИ1-3.
Going to the store, take a flat 4,5 V battery. It is convenient because its terminals easy to connect any microelectronical.
Ask the seller for permission to select his engine to taste, however, connect the battery do not rush. First, inspect the engine externally, primarily drawing attention to the fixation of the cover. Whether it is tightly fixed, there are no distortions. Then check the condition of the contact brackets, move them with your fingers. If they loose, liftout, put this engine in his work time may be lost contact in setclockalarm node.