Electric drive of trawl (warp) winch

To calculate the electric drive of a warp winch, it is recommended to use the method described in the guidelines. It is allowed to use methods and materials from other sources in the course design, including ship’s technical documentation.

Warp winches are the main fishing mechanism for active sea fishing. The drive power of warp winches, depending on the size of the fishing vessel and the depth of trawling, ranges from 40 to 500 kW.

Most fishing winches have electric drives. The main operations performed by fishing winches are lowering the trawl, hauling the warps and hauling the catch on board the vessel. The main operating mode of the warp winch is the selection of warps when lifting the trawl.

In the course design, regular electric drives of the warp winches of the fishing fleet are used, for which, according to the assignment, verification calculations are carried out to select the electric motor, and the appropriate amount of modernization is justified for each electric drive.

Based on the drawbar pull, select a winch size with rated drawbar pull, warp diameter, fishing depth, and hauling and hauling speeds. Pay attention to the fact that the electric drive can have a double-drum winch.

To store 2000 – 3000 m warp on drums, it is wound in layers. On powerful winches, the number of warp layers reaches 20, and the diameter of the warp drum changes on average 1.6 times in both directions from the average winding diameter. In order for the average linear speed of warp picking up to be constant, the rotational speed of the drive motor must be changed in such a way that at the maximum winding diameter it is 0.6 ¸ 0.8 nominal, and at the minimum winding diameter 1.5 ¸ 1.6 nominal and, in addition, the condition n max /n min > 2. From the above conditions, it is necessary to determine the diameter of the drum and the number of layers. When developing circuit diagrams, use the material of guidelines, which provides typical circuit studies of electric drives of trawl winches for the generator-motor system, thyristor converter-DC motor, select its elements and fill out the specification.

When performing a structural study, it is necessary to draw up a general layout of the elements of the electric drive, a structural drawing of the control panel, where you can use the recommended literature, and students of seafarers should use the technical design drawings of the warp winch on the ship as a source material.

When developing a brief operating instruction, it is necessary to give general instructions for technical operation based on regulatory documentation, for example, the rules for the technical operation of ship electrical equipment, the procedure for operating in normal and emergency modes, as well as a brief description of the maintenance of the equipment included in the winch electric drive.

Task options Table No. 2

Penultimate cipher digit Name of the designed electric drive Table number with tech. design data
0, 3, 6 Power steering with hydraulic transmission 4.2
1, 4, 7 Electric drive of the anchor-mooring device 4.2
2, 5, 8, 9 Electric drive of trawl (warp) winch 4.3

Technical data for the calculation of steering and anchor-mooring electric drives Table No. 3

var. no. (last cipher digit The main dimensions of the vessel Displacement D, t Speed J, knots Rudder type Additional data for calculation
Length L, m Width B, m Draft T, m Height H, m
21.8 9.7 12.9 balancing 1. Ship’s mains voltage ~ 380 V. 2. Maximum rudder angle ± 35°. 3. The time of shifting the rudder blade from side to side (from 30 ° L.B. to 35 ° L.B.) – 28 s.
13.4 4.9 6.3 9.4 – ” – ” –
10.0 4.8 7.8 12.5 – ” – ” –
15.8 6.1 10.0 19.5 – ” – ” –
17.0 7.3 11.2 19.1 – ” – ” –
9.0 4.5 7.4 semi-balanced
14.5 3.6 7.1 11.8 – ” – ” –
20.6 9.0 17.7 – ” – ” –
9.3 3.2 3.6 12.7 – ” – ” –
16.8 7.1 10.9 11.6 – ” – ” –

Technical data for calculating the electric drive of a trawl (warp) winch Table No. 4

var. no. (last cipher digit) Traction force F n , kN Rated motor data winch type Vessel type Recommended var. modernization of the electric drive
Power R, kW Voltage U, V Current I, A Speed n, rpm
WT-12-01 BMRT For each specific option, students independently justify the appropriate level of modernization, for example: the use of thyristor exciters instead of machine ones, the replacement of G-D systems with TP-D systems, the replacement of control systems with more modern ones, the replacement of individual parts of foreign-made electric drives with domestic analogues both in the power unit and and in control circuits.
LETR-7 RS project 388M
LETR2-2 BMRT
2´85 LETR2-6M BMRT
LETR-3 MDDS
3KLW-6.3 RTM-A
WTJ12.5W BAT “Horizon”
WTD 12 RS “St. John’s wort”
1KLW90 CTM “Atlantik-333”
1TKW 480 RTM-S “Atlantik-488”

Questions for the defense of the course project

1. The advantage of closed systems in comparison with open ones.

2. Explain the purpose of the main and additional feedback.

3. Explain the principle of operation of the selsyns and indicate the mode of their operation in an autopilot.

4. Explain the operation of the autopilot in remote and tracking mode.

5. Explain the influence of the system gain on the quality of the transient process.

6. . Explain the reason for the different reaction of the system with different setting signals for the fifth and sixth faults.

7. Explain what are the ways to improve the accuracy of ACS

8. Appointment of corrective devices.

9. How does the increase in astatism of the system affect its stability.

10. Explain the work of SAUKS in terms of functional and schematic diagrams.

11. Explain why the autopilot has an integrator reset.

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