Simrad DD15 Manuale utente

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Manual

Simrad DD15

Direct Drive

English

www.busse-yachtshop.de | [email protected]

MANUAL

SIMRAD DD15

Direct Drive

20222303A English

www.busse-yachtshop.de | [email protected]

Simrad DD15 Direct Drive

220222303 / A

About this document

Rev Date Written by Checked by Approved by

06.04.06 NG IK ThHA First edition

No part of this work covered by the copyright hereon may be reproduced or

otherwise copied without prior permission from Simrad AS.

The information contained in this document is subject to change without prior

notice. Simrad AS shall not be liable for errors contained herein, or for incidental

or consequential damages in connection with the furnishing, performance, or use

of this document.

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Introduction

20222303 / A 3

Contents

1SYSTEM DESCRIPTION...............................................5

1.1 General .................................................................................................. 5

1.2 How to use this manual......................................................................... 6

1.3 Performance .......................................................................................... 7

1.4 Compatibility in 12 Volts...................................................................... 8

2CONSTRUCTION .........................................................9

2.1 Electric Motor ....................................................................................... 9

2.2 Planetary gearbox.................................................................................. 9

2.3 Electro magnetic clutch....................................................................... 10

3INSTALLATION.........................................................11

3.1 Mechanical mounting.......................................................................... 11

Reducing noise and vibrations ...................................................12

Feedback unit mounting.............................................................13

Direct drive in combination with rack and pinion system .........15

Direct drive in front of pedestal .................................................17

3.2 Electrical connections ......................................................................... 18

3.3 Test the system....................................................................................19

4MAINTENANCE.........................................................20

5TECHNICAL SPECIFICATIONS ..................................21

Draglinks ....................................................................................22

Spare Parts..................................................................................22

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Simrad DD15 Direct Drive

4 20222303 / A

This page is intentionally left blank

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System description

20222303 / A 5

1SYSTEM DESCRIPTION

1.1 General

The DD15 Direct Drive is a very strong and compact autopilot

drive and more efficient than hydraulic and most electro-

mechanical autopilot drive units. It is powerful (the max. output

torque of 150 Kgm is equivalent to 150 Kg force on the end of a

1 meter steering tiller) and is build for 24 hours per day

continuous operation with a total weight of only 12 Kgs. The

combination of the flat wound (pancake) electric motor with the

efficient planetary and spur gearbox results in an extremely

efficient drive unit to keep the battery charging time to the

minimum. The drive can be used on boats from 30 to 45 feet

l.o.a. (or up to 150 Kgm rudder torque) equipped with a

mechanical steering system that can be back driven. Due to the

electro mechanical clutch, the direct drive can be back driven

with the force of a finger tip leaving the mechanical steering as

sensitive as without drive unit.

The DD15 includes the Simrad RF300 Rudder Feedback unit

with transmission link and 10 m (30 feet) of cable. It transforms

the angular travel of the rudder to a digital signal read by the

autopilot steering computer.

Figure 1-1 Simrad DD15 Direct Drive (with RF300)

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Simrad DD15 Direct Drive

6 20222303 / A

1.2 How to use this manual

This manual is intended as a reference guide for correctly

installing the Simrad DD15 Direct Drive.

Please take time to read the manual to get a thorough

understanding of the use of the drive and the connection to an

autopilot system.

Figure 1-2 Basic autopilot system

This illustration shows the minimum number of components for

a working autopilot configuration.

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Construction

20222303 / A 7

1.3 Performance

The performance table shows the relation between the consumed

power and the output power. The “rudder torque midships” line

shows the output torque against the needed amperage at

midships rudder and the “rudder torque full rudder” line shows

the output torque against the needed amperage at full rudder. The

“hard over time” line shows the hard over time (time to travel

72° of rudder travel) of the drive relative to the output torque.

The table also presents the strength of the drive unit related to

man power. The unit is much stronger than a human being and

can last much longer. One should note however that when the

unit is operated in the dark grey zone, the trim of the boat is not

at its best and the sails should be adjusted to achieve lower

rudder torques. The below table shows that the Simrad direct

drive will steer the yacht even in the worst possible conditions.

As the drive will mostly operate in the light grey zone but not

continuously, the average power consumption on 12 volts is 2

amps.

hardovertime

ruddertorquefull rudder

rudder torque midships

150145

140135

[

Amp ]

high steering forces,

not manageable by hand power

medium to high steering forces,

manageable for a helmsman for a few minutes

light to medium steering forces,

manageable for a helmsman for a few hours

Drive output torque

[Kgm ]

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130

[HO-time

]

Figure 1-3 DD15 Direct Drive performance table

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Simrad DD15 Direct Drive

8 20222303 / A

1.4 Compatibility in 12 Volts

The following table shows the maximum rudder torques at

amidships and full rudder that can be achieved with the Simrad

direct drive in combination with the autopilot computer. The

hard over time (HO-time) states the time it takes the drive to

travel the full 72 degrees of rudder travel when the speed control

of the autopilot is set to maximum speed.

Autopilot computer

12 Volt version. Max. Output

(Amp.) Rudder torque

amidships

(Kgm)

Rudder torque

full rudder

(Kgm)

Simrad AC10 (J3000X) 12 73 140

Simrad AC20 (J300X) 20 80 150

Note Even if the AC10 Autopilot Computer is capable of driving the

unit almost to its full power, the AC20 version will have the

necessary extra power when the unit is operating to its extremes.

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Construction

20222303 / A 9

2CONSTRUCTION

This assembly drawing shows a cross section of the direct drive.

The drive can be separated in 5 main parts: The electric motor,

the two step spur gearbox, the planetary gearbox, the electro-

magnetic clutch and the final spur reduction gearbox. The

Simrad direct drive has multiple advantages over existing

integrated drive units. These advantages will be explained per

section of the drive:

2.1 Electric Motor

The flat wound electric motor (pancake motor) used in the

Simrad direct drive is carefully selected for this application.

Pancake motors have multiple advantages over normal electric

DC motors:

•A large flat wound rotor to achieve a high starting toque and

an immediate response to the autopilot speed control signal.

•A motor efficiency of 72,5% to achieve a minimal power

consumption and maximal mechanical power output

(compared to max. 50% efficiency of a normal DC motor).

•Compact main dimensions compared to achievable output.

•Aluminum motor housing in stead of sheet steel plate to

avoid corrosion.

2.2 Planetary gearbox

To achieve a correct rudder travel speed (hard over time) the

electric motor has to be reduced in speed with a factor 750:1.

Some autopilot drive producers use a worm reduction box, but

the efficiency is extremely low as the gears rub each other. The

Simrad direct drive uses a combination of a planetary gearbox

and spur gear sets (one small gear and one big gear). The

planetary gearbox has following advantages:

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