Tech Briefs Magazine - August 2023 - MD-8

Direct Drive Motors:
Delivering Reliability,
Precision,
and Performance
D
irect drive motors have a
long-standing history as a technology
that has continually evolved
and improved over several decades.
Despite the perception that it has
reached its limits, innovators such as
ETEL continuously evolve and improve
the performance and efficiency of their
direct drive products.
In this article, we will introduce the
technology behind direct drive motors,
explore their advantages, and discuss
example applications.
Understanding Direct Drive
Motors
Direct drive motors, whether linear or
rotary torque motors, directly couple
the payload to the source of motion.
This eliminates the need for mechanical
transmission elements like gearboxes,
timing belts, speed reducers and worm
gear drives. As a result, machine designs
can be simplified, and more compact
solutions can be achieved.
Torque motors and linear motors
belong to a distinctive category of
brushless permanent-magnet synchronous
motors. Linear motors are a
coiled assembly that travels along a
straight track of permanent magnets.
By leveraging the electromagnetic induction
between a coil assembly (primary
part) and a permanent magnet
assembly (secondary part), linear motors
efficiently convert electrical energy
into linear mechanical energy. These
motors are engineered to generate substantial
force at low speeds or even in
stationary conditions.
A torque motor can be viewed as a traditional
servo drive featuring numerous
poles that resembles a linear motor in a
rotary configuration or. The substantial
number of poles in conventional torque
motors allows them to achieve high
torque levels at moderate speeds, even
without any motion. Additionally, their
compact design is an appealing attribute,
encompassing a slender lamination stack
and a sizable hollow shaft or bore.
Both linear motors and torque motors
fall under the " frameless " motor
category. What this means is these motors
do not incorporate a housing, bearings,
or feedback device. Machine builders
have the flexibility to select and optimize
these components based on the
required performance or procure them
as part of a pre-assembled unit.
Unlike brushed rotary motors, direct
drive motors have no contact between
the rotor and stator. This absence
of mechanical
wear significantly
improves
8
Motion Design, August 2023

Tech Briefs Magazine - August 2023

Table of Contents for the Digital Edition of Tech Briefs Magazine - August 2023

Tech Briefs Magazine - August 2023 - Intro
Tech Briefs Magazine - August 2023 - Sponsor
Tech Briefs Magazine - August 2023 - Cov1
Tech Briefs Magazine - August 2023 - Cov2
Tech Briefs Magazine - August 2023 - 1
Tech Briefs Magazine - August 2023 - 2
Tech Briefs Magazine - August 2023 - 3
Tech Briefs Magazine - August 2023 - 4
Tech Briefs Magazine - August 2023 - 5
Tech Briefs Magazine - August 2023 - 6
Tech Briefs Magazine - August 2023 - 7
Tech Briefs Magazine - August 2023 - 8
Tech Briefs Magazine - August 2023 - 9
Tech Briefs Magazine - August 2023 - 10
Tech Briefs Magazine - August 2023 - 11
Tech Briefs Magazine - August 2023 - 12
Tech Briefs Magazine - August 2023 - 13
Tech Briefs Magazine - August 2023 - 14
Tech Briefs Magazine - August 2023 - 15
Tech Briefs Magazine - August 2023 - 16
Tech Briefs Magazine - August 2023 - 17
Tech Briefs Magazine - August 2023 - 18
Tech Briefs Magazine - August 2023 - 19
Tech Briefs Magazine - August 2023 - 20
Tech Briefs Magazine - August 2023 - 21
Tech Briefs Magazine - August 2023 - 22
Tech Briefs Magazine - August 2023 - 23
Tech Briefs Magazine - August 2023 - 24
Tech Briefs Magazine - August 2023 - 25
Tech Briefs Magazine - August 2023 - 26
Tech Briefs Magazine - August 2023 - 27
Tech Briefs Magazine - August 2023 - 28
Tech Briefs Magazine - August 2023 - 29
Tech Briefs Magazine - August 2023 - 30
Tech Briefs Magazine - August 2023 - 31
Tech Briefs Magazine - August 2023 - 32
Tech Briefs Magazine - August 2023 - 33
Tech Briefs Magazine - August 2023 - 34
Tech Briefs Magazine - August 2023 - 35
Tech Briefs Magazine - August 2023 - 36
Tech Briefs Magazine - August 2023 - 37
Tech Briefs Magazine - August 2023 - 38
Tech Briefs Magazine - August 2023 - 39
Tech Briefs Magazine - August 2023 - 40
Tech Briefs Magazine - August 2023 - 41
Tech Briefs Magazine - August 2023 - 42
Tech Briefs Magazine - August 2023 - 43
Tech Briefs Magazine - August 2023 - 44
Tech Briefs Magazine - August 2023 - 45
Tech Briefs Magazine - August 2023 - 46
Tech Briefs Magazine - August 2023 - 47
Tech Briefs Magazine - August 2023 - 48
Tech Briefs Magazine - August 2023 - Cov3
Tech Briefs Magazine - August 2023 - Cov4
Tech Briefs Magazine - August 2023 - MD-Cov1
Tech Briefs Magazine - August 2023 - MD-Cov2
Tech Briefs Magazine - August 2023 - MD-1
Tech Briefs Magazine - August 2023 - MD-2
Tech Briefs Magazine - August 2023 - MD-3
Tech Briefs Magazine - August 2023 - MD-4
Tech Briefs Magazine - August 2023 - MD-5
Tech Briefs Magazine - August 2023 - MD-6
Tech Briefs Magazine - August 2023 - MD-7
Tech Briefs Magazine - August 2023 - MD-8
Tech Briefs Magazine - August 2023 - MD-9
Tech Briefs Magazine - August 2023 - MD-10
Tech Briefs Magazine - August 2023 - MD-11
Tech Briefs Magazine - August 2023 - MD-12
Tech Briefs Magazine - August 2023 - MD-13
Tech Briefs Magazine - August 2023 - MD-14
Tech Briefs Magazine - August 2023 - MD-15
Tech Briefs Magazine - August 2023 - MD-16
Tech Briefs Magazine - August 2023 - MD-17
Tech Briefs Magazine - August 2023 - MD-18
Tech Briefs Magazine - August 2023 - MD-19
Tech Briefs Magazine - August 2023 - MD-20
Tech Briefs Magazine - August 2023 - MD-21
Tech Briefs Magazine - August 2023 - MD-22
Tech Briefs Magazine - August 2023 - MD-23
Tech Briefs Magazine - August 2023 - MD-24
Tech Briefs Magazine - August 2023 - MD-25
Tech Briefs Magazine - August 2023 - MD-26
Tech Briefs Magazine - August 2023 - MD-27
Tech Briefs Magazine - August 2023 - MD-28
Tech Briefs Magazine - August 2023 - MD-29
Tech Briefs Magazine - August 2023 - MD-30
Tech Briefs Magazine - August 2023 - MD-31
Tech Briefs Magazine - August 2023 - MD-32
Tech Briefs Magazine - August 2023 - MD-33
Tech Briefs Magazine - August 2023 - MD-34
Tech Briefs Magazine - August 2023 - MD-35
Tech Briefs Magazine - August 2023 - MD-36
Tech Briefs Magazine - August 2023 - MD-37
Tech Briefs Magazine - August 2023 - MD-38
Tech Briefs Magazine - August 2023 - MD-39
Tech Briefs Magazine - August 2023 - MD-40
Tech Briefs Magazine - August 2023 - MD-41
Tech Briefs Magazine - August 2023 - MD-42
Tech Briefs Magazine - August 2023 - MD-43
Tech Briefs Magazine - August 2023 - MD-44
Tech Briefs Magazine - August 2023 - MD-Cov3
Tech Briefs Magazine - August 2023 - MD-Cov4
https://www.nxtbook.com/smg/techbriefs/25TB01
https://www.nxtbook.com/smg/techbriefs/24TB12
https://www.nxtbook.com/smg/techbriefs/24TB11
https://www.nxtbook.com/smg/techbriefs/24TB10
https://www.nxtbook.com/smg/techbriefs/24TB09B
https://www.nxtbook.com/smg/techbriefs/24TB09
https://www.nxtbook.com/smg/techbriefs/24TB08
https://www.nxtbook.com/smg/techbriefs/24TB07
https://www.nxtbook.com/smg/techbriefs/24TB06
https://www.nxtbook.com/smg/techbriefs/24TB05B
https://www.nxtbook.com/smg/techbriefs/24TB05
https://www.nxtbook.com/smg/techbriefs/24TB04
https://www.nxtbook.com/smg/techbriefs/24TB03
https://www.nxtbook.com/smg/techbriefs/24TB02
https://www.nxtbook.com/smg/techbriefs/24TB01
https://www.nxtbook.com/smg/techbriefs/23TB12
https://www.nxtbook.com/smg/techbriefs/23TB11
https://www.nxtbook.com/smg/techbriefs/23TB10
https://www.nxtbook.com/smg/techbriefs/23TB09
https://www.nxtbook.com/smg/techbriefs/23TB08
https://www.nxtbook.com/smg/techbriefs/23TB07
https://www.nxtbook.com/smg/techbriefs/23TB06
https://www.nxtbook.com/smg/techbriefs/23TB05
https://www.nxtbook.com/smg/techbriefs/23TB04
https://www.nxtbook.com/smg/techbriefs/23TB03
https://www.nxtbook.com/smg/techbriefs/23TB02
https://www.nxtbook.com/smg/techbriefs/23TB01
https://www.nxtbook.com/smg/Testing/22TB12
https://www.nxtbook.com/smg/techbriefs/22TB12
https://www.nxtbook.com/smg/techbriefs/22TB11
https://www.nxtbook.com/smg/techbriefs/22TB10
https://www.nxtbook.com/smg/techbriefs/22TB09
https://www.nxtbook.com/smg/techbriefs/22TB08
https://www.nxtbook.com/smg/techbriefs/22TB07
https://www.nxtbook.com/smg/techbriefs/22TB06
https://www.nxtbook.com/smg/techbriefs/22TB05-P
https://www.nxtbook.com/smg/techbriefs/22TB05-D
https://www.nxtbook.com/smg/techbriefs/22TB04
https://www.nxtbook.com/smg/techbriefs/22TB03
https://www.nxtbook.com/smg/techbriefs/22TB02
https://www.nxtbook.com/smg/techbriefs/22TB01
https://www.nxtbook.com/smg/techbriefs/21TB12
https://www.nxtbook.com/smg/techbriefs/21TB11
https://www.nxtbook.com/smg/techbriefs/21TB10
https://www.nxtbook.com/smg/techbriefs/21TB09
https://www.nxtbook.com/smg/techbriefs/21TB08
https://www.nxtbook.com/smg/techbriefs/21TB07
https://www.nxtbook.com/smg/techbriefs/21TB06
https://www.nxtbook.com/smg/techbriefs/21TB05
https://www.nxtbook.com/smg/techbriefs/21TB04
https://www.nxtbook.com/smg/techbriefs/21BT03
https://www.nxtbook.com/smg/techbriefs/21TB02
https://www.nxtbookmedia.com