DRV-0,1 electric motor in a tape recorder. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Reference materials
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Tape motors such as DKS-8, 4DKS-8, DKS-16, ZDPRS known to radio amateurs are expensive and rarely available for sale. Making a good engine on your own is quite difficult.
The author of the article in several designs of tape recorders used the DRV-0,1 electric motor used in the Efir-M radiogram (see Fig. 1). This relatively inexpensive motor is powered by a battery, batteries or a rectifier.
Rice. 1 External view of the DRV-0,1 engine
It can operate at a voltage of 10 to 6,6 V, which allows you to fully use the useful capacity of current sources. The operating characteristics of the engine are shown in fig. 2-4. Its dimensions are 46X42X58 mm, without shaft overhang and mounting plate. Departure of a shaft with a diameter of 3 mm is about 18 mm. Engine weight 185 g. The direction of rotation when working with the speed controller is counterclockwise, when viewed from the side of the shaft extension. Without a regulator (when power is supplied directly to the armature), the electric motor allows reversal, which is carried out by changing the polarity of the voltage on the brushes. This can be used in the "rewind" and "fast forward" mode. The operating position of the engine is vertical - with the shaft up, but if the axial play is limited by installing a few additional washers, it can also work in a horizontal position.
The electric motor is suitable for tape recorders with reels up to 180 mA. The current consumed by the motor depends on the quality of the mechanism. In an average quality mechanism, the motor current is 70-80 mA.
Rice. Fig. 2. Operating characteristics of the DRV-0,1 engine with the speed controller turned off at a supply voltage of 10 V. M - load torque on the motor shaft, n - motor rotation speed, I - current consumption, P2 - shaft power, P1 - power consumption; n - efficiency factor
If the load moment from the tape drive mechanism of the tape recorder is less than 5 g cm, it is necessary to unsolder the resistor shunting the speed controller contact and replace it with another one with a high resistance (about 1-2 kΩ), otherwise, with increased voltage, the engine speed will not be regulated.
In all cases, it is useful to replace the resistor with a transistor circuit (see "Radio", 1968, No. 1, pp. 38-39). But at the same time, it is necessary to isolate both armature brushes from the case and select the capacitance of the capacitors in the transistor circuit according to the load from the tape drive mechanism of the tape recorder. It should be remembered that the motor housing is connected to the current-collecting brush of the regulator and is energized. It is also useful to isolate the limiter of the regulator leaf spring travel, since when switching the operating mode from "rapid travel" to "working travel", the spring does not have time to move away from the limiter, the governor remains in the closed state, and the engine continues to run without speed stabilization.
To protect the magnetic heads and other sensitive elements of the tape recorder from interference, the electric motor must be shielded.
Rice. Fig. 3. Operating characteristics of the DRV-0,1 engine with the speed controller disabled, at a supply voltage of 6,5 V
Rice. 4. Performance characteristics of the DRV-0,1 engine with a speed controller
Author: I. Astashkin; Publication: N. Bolshakov, rf.atnn.ru
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