Magnetics Business & Technology - March/April 2021 - 27

INDUSTRY NEWS
alternating field required via electric switching, the " frequency
converter " . No brush loss is produced and the motors are maintenance-free. It is only in the last few years that major advances
in the fields of electronic power components and circuit design
have allowed these high-performance motors to be produced at
an affordable price. Torqeedo motors are always electronically
commutated motors with tailor-made power electronics.

Permanent-magnet excitation

Torqeedo motors are always permanent-magnet excited motors
rather than electromagnetically excited. An electromagnetically
excited motor generates the required magnetic field by means
of a second coil field. This makes the motor less expensive but
at the price of greater volume and weight compared to a motor
with excitation from a permanent magnet, and also results in
significantly higher power consumption and lower efficiency.
Permanent magnets, however, can generate the required
magnetic field while avoiding loss of performance due to the
excitation coil.

External rotor motors

A key structural design element is the type of rotor, with
Torqeedo typically opting for external rotor motors over disc
rotor or internal rotor designs. Internal rotors constitute the
classical construction of an electric motor, where the rotor is
surrounded by the stator. The rotor is the part of the motor
that rotates, is connected to the motor shaft and is also called
the armature. Since, with an internal rotor, the coils are on
the outside, the motor has advantages with regard to cooling.
However, compared to other structural designs, it generates
relatively low torque.

saildrive system,
and since I was
already in contact
with Torqeedo,
I knew precisely
which components would be
involved in a
Deep Blue Hybrid
installation, their
" I work for Tesla; I know the benefits of
dimensions
electric power " , says Charles Kuehmann.
and how much they
weighed. A sailboat is
all about weight and
balance. I needed to keep the weight low and as close to the
centerline as possible. "
Now, looking ahead from its headquarters in Gilching, Germany, Torqeedo sees plenty of space for further growth. It estimates that today's global market share of electric boat drives is
approximately 2%, similar to the overall market share of electric
cars. On protected lakes, electric drives make up most of the
market because combustion engines are limited or banned.
The brains behind the company are provided by a more than
200-strong international team specializing in mechanical design, electronic development, software programming, procurement, production, marketing, controlling, sales, service and
management.
For more info, see www.torqeedo.com.

A disc rotor generates torque by arranging the axle of the magnetic field parallel to the shaft instead of radial to the shaft. This
allows geometries to be realized where the electromagnetic
force is generated well away from the axle, producing greater
torque with the same force. However, outboard motors with
direct water cooling have a disadvantage with the disc rotor
layout. Disc rotor motors cannot be installed direct in a pylon
due to their very large diameter.
In external rotors, though, the coils are located on the inside.
The magnets are situated on a bell rotating on the outside.
External rotor motors thus achieve significantly greater torque
than internal rotor motor with the same structural form, making
them preferred for most of Torqeedo's output.

Radial flux motors

Direction of the magnet field causes Torqeedo to go typically
with radial flux motors rather than transverse flux motors. In this
case the magnetic field is vertical to the rotational axis. Rotational movement comes from a lateral (rotational angle) offset
between stator and rotor. In transverse flux motors, though, the
magnetic field is largely parallel to the rotational axis. Rotational
movement also comes from a lateral (rotational angle) offset
between stator and rotor. Transverse flux motors need 3-dimensional magnetic flow management and are therefore complex
for marine applications, believes Torqeedo.
Dr Charles Kuehmann leads materials engineering at two of
the world's most innovative companies, Tesla and SpaceX.
An avid sailor, he is also the owner of an Elan GT5 sailboat
with a Torqeedo Deep Blue hybrid drive system. " Converting to hybrid-electric could bring a lot of advantages, " recalls
Kuehmann. " I wanted to prove it. I chose the 25 kW Deep Blue

www.MagneticsMag.com

March/April 2021 * Magnetics Business & Technology

27


http://www.torqeedo.com http://www.itg-electronics.com http://www.MagneticsMag.com

Magnetics Business & Technology - March/April 2021

Table of Contents for the Digital Edition of Magnetics Business & Technology - March/April 2021

Magnetics Business & Technology - March/April 2021
Editor’s Choice/ Features
Top-Tier Automotive Suppliers Transform to Become Fully Integrated e-Powertrain Manufacturers, Part 1 of 2 Wi
e-Traction of Netherlands Rolls Ahead with New EV Powertrain Designs
Electric Motors from ECA Group Power Nuclear Attack Subs for French Navy
Advanced e-Propulsion & EV Development Blossoms in UK with Fresh Government Funding
Research & Development
Product News
Industry News
Events Calendar/ Advertising Index
Visions
Magnetics Business & Technology - March/April 2021 - Magnetics Business & Technology - March/April 2021
Magnetics Business & Technology - March/April 2021 - Cover2
Magnetics Business & Technology - March/April 2021 - 3
Magnetics Business & Technology - March/April 2021 - Editor’s Choice/ Features
Magnetics Business & Technology - March/April 2021 - 5
Magnetics Business & Technology - March/April 2021 - Top-Tier Automotive Suppliers Transform to Become Fully Integrated e-Powertrain Manufacturers, Part 1 of 2 Wi
Magnetics Business & Technology - March/April 2021 - 7
Magnetics Business & Technology - March/April 2021 - 8
Magnetics Business & Technology - March/April 2021 - 9
Magnetics Business & Technology - March/April 2021 - e-Traction of Netherlands Rolls Ahead with New EV Powertrain Designs
Magnetics Business & Technology - March/April 2021 - 11
Magnetics Business & Technology - March/April 2021 - Electric Motors from ECA Group Power Nuclear Attack Subs for French Navy
Magnetics Business & Technology - March/April 2021 - 13
Magnetics Business & Technology - March/April 2021 - Advanced e-Propulsion & EV Development Blossoms in UK with Fresh Government Funding
Magnetics Business & Technology - March/April 2021 - 15
Magnetics Business & Technology - March/April 2021 - Research & Development
Magnetics Business & Technology - March/April 2021 - 17
Magnetics Business & Technology - March/April 2021 - 18
Magnetics Business & Technology - March/April 2021 - 19
Magnetics Business & Technology - March/April 2021 - Product News
Magnetics Business & Technology - March/April 2021 - 21
Magnetics Business & Technology - March/April 2021 - 22
Magnetics Business & Technology - March/April 2021 - 23
Magnetics Business & Technology - March/April 2021 - Industry News
Magnetics Business & Technology - March/April 2021 - 25
Magnetics Business & Technology - March/April 2021 - 26
Magnetics Business & Technology - March/April 2021 - 27
Magnetics Business & Technology - March/April 2021 - Events Calendar/ Advertising Index
Magnetics Business & Technology - March/April 2021 - 29
Magnetics Business & Technology - March/April 2021 - Visions
Magnetics Business & Technology - March/April 2021 - Cover3
Magnetics Business & Technology - March/April 2021 - Cover4
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