The electric drive of the winding device for edges. Scheme, description

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The electric drive of the winding device for edges. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Electric motors

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In the manufacture or processing of film materials, paper, rubber and textiles, the edges are cut off from the web. The edges should be stored as compactly as possible. To do this, it is necessary to wind them into a roll using a winding device. The winding device rotates an electric motor (EM) with an adjustable speed. Below is an electric drive based on a 3-phase EM. The electrical circuit of the electric drive is shown in the figure.

(click to enlarge)

The electric drive contains two triac voltage regulators included in two of the three phases supplied to the 3-phase ED. Voltage regulation is carried out by a double resistor R5-R9, while changing the speed and torque. Triac voltage regulators have pulse-phase control. Thyristor switches VS4, VS5 type KR1135KP3B [1] are used. EM for the drive requires a power of 1 ... 1,5 kW and with a low number of revolutions (700 rpm). To use the ED in this mode, it is necessary to install a fan on it, which is rotated by a single-phase motor with a power of 50 W at a speed of 1000 rpm.

The electric drive has a protective device in case of edge breakage. EM M2 is protected by automatic switch SF2, and if it is not turned on, then EM M1 will not start either.

Details. Circuit breaker SF1 of any type for a current of 10 A, and SF2 for a current of 1,6 A.

Thyristors TS122-25-10 are installed on radiators with an area of at least 50 cm2. Capacitors C2-C5 type K73-17. MLT type resistors. Optocoupler VS1 AOU103V or AOU115D.

Adjustment. By pressing the SB2 button and without releasing it, the angle of rotation of the resistor R5-R9 is set to 10 ° and the resistors R4 and R8 achieve the launch of the ED M1. Then, releasing the SB2 button, resistors R4 and R8, controlling the voltage with a PV1 voltmeter, achieve the same voltmeter readings in the switch position SA1 1 and 2. The ED starts when there is a load.

The electric drive can also be used in winders, if you install a rocking roller, the axis of which is connected to a variable resistor of 100 kΩ, included in the same way as R9, and connect it to terminals 1 and 2 by removing the jumper. To configure, you need to put the switch SA1 in position 2 and resistor R8 to achieve the same readings of the voltmeter PV1 in the position of the switch SA1 1 and 2.

References:

Thyristor switches of the KR1125KP2 and KR1125KP3 series // Radio. 1998. - No. 5. - P.59-61.

Author: V.F. Yakovlev

See other articles Section Electric motors.

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