Stabilizers of rotation of LPM engines. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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LPM engine rotation stabilizers

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Encyclopedia of radio electronics and electrical engineering / Electric motors

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In the now widespread portable radio tape recorders manufactured in the countries of Southeast Asia and some European countries, collector DC motors (KDPT) with built-in speed controllers (with right or left rotation) for voltages of 6, 9 and 12V are used.

Stabilizers of rotation of LPM engines. 12 volt two-speed motor frequency regulator
Rice. 1. 12V two-speed motor frequency controller

The reliability of these stabilizers, to put it mildly, leaves much to be desired, and they often (especially during intensive use) fail. The cost of the assembled engines is quite significant. In my opinion, it is easier to replace the stabilizer IC. To simplify the repair and possible modernization, I give the schematic diagrams of the most common KDPT firms "Matsuschita" and "Mabushi". In Fig. 1 - the frequency regulator of a two-speed electric motor for a voltage of 12 V, in Fig. 2 - a single-speed, for 9 V. The circuits are drawn directly from the printed circuit boards of the stabilizers. The inclusion of additional elements for adjusting the rotation speed in the first circuit is shown in Fig.3.

Stabilizers of rotation of LPM engines. Single-speed motor frequency regulator for 9 volts
Rice. 2. 9V single speed motor frequency controller

The direction of rotation of the KDPT shaft is determined by the designation in the lower right corner of the nameplate: the left-hand rotation motor is designated CCW ("contra clock way" - "counterclockwise"), the right rotation - CW ("clock way" - "clockwise"). The stabilizers described here can also be used in domestic cassette tape recorders and radio tape recorders instead of outdated regulators RChV-1-02 and RS-1-09. Unfortunately, the integrated circuits used in them do not have domestic analogues.

Stabilizers of rotation of LPM engines. Inclusion of additional elements for adjusting the rotation speed
Rice. 3. Inclusion of additional elements to adjust the rotation speed

Author: V.Kharkovskiy, Liski, Voronezh region; Publication: radioradar.net

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