Table of Contents

1. Introduction | Beyond the News Headline


2. What Is a Ferroelectric Motor? — A Big Picture of “Motors Without Magnets”

2-1. The Difference Between Electromagnetic and Electrostatic Motors

2-2. Ferroelectric Nematic Liquid Crystals: “Over-Sensitive Liquids”

2-3. Maxwell Stress and TEF (Transverse Electrostatic Force)

2-4. A Motor That Can Spin With Plastic Rotors



3. What “Rare-Earth-Free and Magnet-Free” Really Means — Quiet Economic Security

3-1. Motors as Blocks of Strategic Minerals

3-2. An Alternative Path: Motors Based on Organic Materials

3-3. Why Having Options Builds Resilience



4. Where Could It Be Used? Lateral Thinking on Ferroelectric Motor Applications

4-1. Robots and Devices That Can Move Inside MRI Scanners

4-2. “Artificial Muscles” for Soft Robots and Wearables

4-3. Micro Pumps and Tiny Worlds on a Chip

4-4. Ferroelectric Motors as Energy-Harvesting Devices



5. From the Perspective of a Severely Disabled Person: The Value of “Light” and “Simple”

5-1. The Heavier the Motor, the Heavier the Life

5-2. Design Freedom With Plastic Rotors

5-3. Living While Holding Both Excitement and Fear Toward Technology



6. Current Challenges and Limits — Temperature, Speed, Lifetime, and Cost

6-1. Temperature Dependence of Ferroelectric Nematic Liquid Crystals

6-2. A Modest 40 rpm and What May Come Next

6-3. Reliability and Maintenance Issues Unique to Liquid-Crystal Motors



7. Conclusion | Entrusting Hopes to a Small Rotating Body Where Science Meets Literature


8. FAQ




—

1. Introduction | Beyond the News Headline

“University develops a ferroelectric motor that uses no rare earths, no magnetic fields, and no magnets.”

When I saw that headline on my small smartphone screen,
my thumb, used to endless scrolling, stopped in mid-air.

Rare-earth-free.
No magnetic field, no magnets.
Ferroelectric motor.

For most of my life, a “motor” simply meant a lump of copper wire and magnets.
Thanks to neodymium magnets and other rare-earth materials,
EVs, air conditioners, and industrial robots keep rotating as if it were the most natural thing in the world.
That’s the “normal” of our current society.

And now, a piece of research quietly emerging in Japan
may end up rewriting that normal from the ground up.

I suffered a cerebral hemorrhage in mid-life and acquired a severe disability.
Today, I live supported by wheelchairs, medical devices, and rehabilitation equipment.

Because of this, news about “technology that moves things”
is no longer just “someone else’s cool tech” for me.

I can’t help thinking:

Where will this technology enter daily life?

Which parts of the body, or of life, might it make lighter?

Or, might it introduce new risks somewhere?


Much more than before, these questions feel personal and urgent.

In this article:

I want to keep the scientific information as accurate as possible,

avoid drowning you in equations and jargon,

and occasionally borrow the language of literature,


to think about how this “ferroelectric motor,”
which needs neither rare earths nor magnets,
may change our bodies and our society.

I won’t lie.
I’ll write about both the hopes and the worries as they are.


—

2. What Is a Ferroelectric Motor? — A Big Picture of “Motors Without Magnets”

Let’s first gently—but honestly—unpack
the central character of this article: the ferroelectric motor.

2-1. The Difference Between Electromagnetic and Electrostatic Motors

Most motors we see in everyday life are electromagnetic motors.

Current flows through a coil

A magnetic field forms around the coil

That magnetic field interacts with magnets or other coils to generate torque

The torque makes the rotor spin


This setup is supported by:

large amounts of copper wire (for coils), and

rare-earth magnets such as neodymium magnets.


EVs, elevators, air conditioners,
robot arms in factories, and even massive pumped-storage generators—
all of them trace back to this electromagnetic motor family.

On the other hand, there has long existed another type, the electrostatic motor.
Instead of magnetic fields, it uses:

voltage applied between electrodes,

electrostatic attractive or repulsive forces between those electrodes.


However, traditional electrostatic motors suffer from:

low output,

the need for high voltages,

and a tendency for electrodes to contact and short.


As a result, their real-world applications have been very limited.

The ferroelectric motor enters this world of electrostatic motors
as a design that opens up an entirely new “pathway for driving motion.”

2-2. Ferroelectric Nematic Liquid Crystals: “Over-Sensitive Liquids”

The key material behind this new motor is something with a tongue-twisting name:

> Ferroelectric nematic liquid crystal.



Let’s break that down a bit.

“Ferroelectric” refers to materials that:

have a spontaneous polarization (a built-in separation of positive and negative charges)

even when no external electric field is applied, and

can flip that polarization direction sharply when an electric field is applied.


“Nematic liquid crystal” refers to a state of matter where:

molecules tend to align in roughly the same direction,

but still flow like a liquid rather than being locked in place as in a solid.


The display in your smartphone or TV uses liquid crystals;
one of the phases used there is also a nematic liquid crystal.

Now combine the two:
A ferroelectric nematic liquid crystal.

This material is extremely “sensitive”:

its relative permittivity can exceed 10,000,

and it has a large spontaneous polarization.


From the viewpoint of ordinary materials,
this is an almost shockingly high sensitivity.

To put it metaphorically:

> It’s a liquid so sensitive that,
with just a tiny electric field,
it responds thousands of times more strongly than ordinary substances.



The ferroelectric motor leverages this over-sensitivity,
but in a direction that was almost ignored until now.

2-3. Maxwell Stress and TEF (Transverse Electrostatic Force)

In regions where electric fields exist,
a concept called Maxwell stress is used to describe the forces that appear.

Leaving out the equations, we can imagine it like this:

wherever an electric field is present,

it creates a tendency to pull or push on objects

along the field lines and even in some perpendicular directions.


Conventional electrostatic motors mostly used
the component of this stress that:

> pulls electrodes together face-to-face.



But Maxwell stress also has another contribution:
a component that acts perpendicular to the electric field.

A research team at Tokyo University of Science focused on this “sideways” component
and intentionally designed for it, calling it:

> Transverse Electrostatic Force (TEF).



It is, quite literally, the sideways electrostatic force.

They then sandwiched a ferroelectric nematic liquid crystal—
this very over-sensitive material—between electrodes.
When an electric field is applied, TEF pushes the liquid crystal upward.

This sideways component, usually too small to matter with ordinary materials,
becomes a practically useful driving force
when amplified through the ferroelectric nematic liquid crystal.

2-4. A Motor That Can Spin With Plastic Rotors

The basic structure of a ferroelectric motor is something like this:

fixed electrodes (stator) above and below,

a plastic rotor in between,

and the space filled with a ferroelectric nematic liquid crystal.


The electrodes themselves are not moved.
Instead, the electric field causes the liquid crystal to move via TEF,
and that motion is transmitted as torque to the rotor.

This differs from conventional motors in several striking ways:

no magnetic field is used,

no magnets are required,

the rotor can be made entirely of plastic,

no slip rings or brushes are needed to feed electricity into the rotor.


In one prototype:

stator: 3-phase, 24 poles

rotor: 16 poles

drive: 3-phase pulse voltage, 60 V amplitude, 10 Hz

rotation speed: about 40 rpm (revolutions per minute)


On paper, 40 rpm looks modest, even underwhelming.
But the crucial point is this:

> A motor can spin using only liquid crystals and electrodes,
without rare earths, without magnets, and without magnetic fields.



That’s the physical fact being demonstrated.


—

3. What “Rare-Earth-Free and Magnet-Free” Really Means — Quiet Economic Security

The phrases “rare-earth-free” and “magnet-free” in the news
naturally capture a lot of attention.

But they are more than just technical buzzwords.
They tie directly into the broader story of economic security.

3-1. Motors as Blocks of Strategic Minerals

In today’s world, motors are, in effect,
blocks of strategic minerals.

They rely heavily on:

copper for coils,

rare-earth elements like neodymium for permanent magnets.


As the world pushes toward decarbonization and electrification,
we are deploying more and more EVs, wind turbines, and electric machinery.
The demand for motors is rising, and with it, the dependence on these materials.

At the same time:

rare-earth deposits are geographically concentrated,

mining and refining can impose severe environmental burdens,

and there is growing geopolitical tension around resource supply.


In other words,
“increasing the number of motors” is almost equivalent to
“increasing our dependence on strategic minerals”.

3-2. An Alternative Path: Motors Based on Organic Materials

By contrast, the ferroelectric motor uses
a ferroelectric nematic liquid crystal based on organic molecules.

Of course, this does not mean:

there are no issues with raw material supply,

or that synthesis processes and waste treatment are problem-free.


Those are serious topics in their own right.

Still, this kind of material:

may rely on a different supply chain than rare-earth mining,

can, in principle, be “designed” in terms of properties via organic chemistry,

might someday be synthesized from biomass or other alternative feedstocks.


In that sense, it suggests:

> Not just a world of motors heavily tied to rare earths and copper,
but the possibility of a different path based on organic materials.



3-3. Why Having Options Builds Resilience

When we talk about economic security,
the crucial question is not just “What do we use?” but:

> “What are we forced to rely on?”



If:

rare-earth supply is disrupted for political reasons, or

copper prices spike dramatically,


the key question becomes:

Can we simply buy the same kind of motor from another country?


and also:

Do we have alternative motor technologies based on different principles and materials?


The ferroelectric motor will not magically answer all of that on its own.
However, it does provide solid, physical proof that:

> “Motors can be built and operated
without magnets and without rare earths.”



Even that small proof increases the technological resilience of society,
quietly but surely.


—

4. Where Could It Be Used? Lateral Thinking on Ferroelectric Motor Applications

From here on, let’s do a bit of lateral thinking.
We’ll assume:

this is still a research-stage technology,

we’re not forecasting the future with certainty,


and instead ask:

> “Where might ferroelectric motors be useful?”



Not as firm predictions, but as “what if” ideas.

4-1. Robots and Devices That Can Move Inside MRI Scanners

In medicine, there is a very special environment:

The inside of an MRI scanner.

a strong static magnetic field is always present,

bringing metals or magnets inside can be dangerous,

electromagnetic motors are affected by the magnetic field and can generate unwanted noise.


Meanwhile, researchers worldwide are exploring scenarios where, inside MRI scanners:

small robots move within the body,

devices adjust their position during imaging,

cameras or sensors rotate quietly.


Ferroelectric motors, which use neither magnetic fields nor magnets and can have plastic rotors,
could be candidates for:

> “Drive sources that can operate inside MRI scanners
without fighting the magnetic field.”



Of course, there are many hurdles:

interference with RF pulses,

safety and biocompatibility of materials,

heating and electromagnetic noise.


These issues must be thoroughly addressed.

Still, having more options for motors that can work safely in strong magnetic fields
would significantly expand design possibilities for medical devices.

4-2. “Artificial Muscles” for Soft Robots and Wearables

In robotics, there is a clear trend:

> From “hard robots” to “soft robots”.



Examples include:

soft robot arms made of silicone or rubber,

collaborative robots designed to be safe when touching humans,

wearable power-assist suits worn like clothing.


In these domains, what matters most is:

light weight,

flexibility,

simple structures.


Ferroelectric nematic liquid crystals have long been considered candidates for artificial muscle materials.
As technologies like the ferroelectric motor mature, we could see:

lightweight exoskeletons that gently assist the shoulder or lower back,

rehabilitation gloves that softly support finger movements,

wearable devices that help expand the chest in sync with breathing.


Ferroelectric motors might serve as small, light, quiet actuators inside such devices.

4-3. Micro Pumps and Tiny Worlds on a Chip

The TEF (Transverse Electrostatic Force) has two notable characteristics:

it doesn’t require extremely tiny electrode gaps to work,

it lends itself to thin, multilayer structures that can generate force over an area.


This makes it potentially suitable for:

lab-on-a-chip devices,

biochips,

microfluidic systems — essentially “tiny worlds carved into chips”.


If we design around the phenomenon where liquid crystals are pushed up by electric fields,
we might create:

micro pumps to move minuscule volumes of reagents,

valves controlling flows of blood or chemical solutions in narrow channels,

on-chip actuators for biological or chemical analysis devices.


These are not confirmed applications,
but they appear as plausible directions on the horizon.

4-4. Ferroelectric Motors as Energy-Harvesting Devices

In essence, motors are reversible devices:

Feed them electricity and they spin as motors.

Spin them and they generate electricity.


If we run the ferroelectric motor principle in reverse, we could:

convert small human motions like walking or stepping,

vibrations from wheelchairs,

tiny oscillations of structures,


into small amounts of electrical power,
turning it into an energy-harvesting device.

For example:

powering small sensors,

providing supplemental power to wearable devices,

supplying trickle power for remote care equipment.


It wouldn’t be a large amount of electricity,
but it might be enough to keep distributed, low-power devices alive.


—

5. From the Perspective of a Severely Disabled Person: The Value of “Light” and “Simple”

Now let me step away from technology and markets
and look at ferroelectric motors from a very personal angle:
that of a mid-career, severely disabled person.

5-1. The Heavier the Motor, the Heavier the Life

Before I became disabled,
I never thought about how much a motor weighed.

Of course washing machines are heavy.

Of course electric beds are heavy.

Of course power wheelchairs are heavy.


“Weight” was just background noise
I never really noticed.

But once my life came to depend on machines, everything changed.

A heavy power wheelchair makes loading into a car a serious task.

A heavy care bed requires multiple people to move or install.

Heavy medical devices make going out more burdensome and restrict range of movement.


The weight of the motor becomes, directly:

> the weight of the machine that supports you,
and the “hard-to-move-ness” of your daily life.



That’s why the phrase “light and simple motors”
hits me so strongly.

5-2. Design Freedom With Plastic Rotors

One of the distinctive features of ferroelectric motors is that
the rotor can be made entirely of plastic.

This has consequences beyond:

“it’s lighter”,

“molding is simpler than machining metal”.


It means we may be able to:

> hide motors in places
where it was previously difficult to put them.



For instance, we might embed them:

in the joints of ankle braces,

inside support garments for shoulders or hips,

in small assistive robots that even children can lift.


For devices that stay in close contact with the body,
it’s a major advantage if the internal mechanism is not a dense lump of metal.

A rotor and structure primarily made of plastic
lowers both physical and psychological barriers to wearing such devices.

5-3. Living While Holding Both Excitement and Fear Toward Technology

Earlier, I read a news story about “electrode sheets covering the brain”
and brain–computer interfaces (BCI).
I felt both a visceral excitement and a quiet, lingering fear.

As technology, these ideas are dazzling.
They sketch visions of new kinds of communication and control.

But because I have actually experienced a brain hemorrhage—
because I’ve felt my own brain “break”—
the idea of placing more electrodes on it
is not something I can easily accept.

Ferroelectric motors do not directly touch the brain.
Even so:

they deal with strong electric fields,

they involve new materials whose long-term behavior we still don’t fully know,

and we have little long-term data on safety and reliability.


For these reasons, I don’t think it’s right
to shout “This is a dream technology!” and leave it at that.

For me, becoming severely disabled has meant
learning to live while holding:

excitement and fear,

hope and anxiety,


all at once.

I don’t want to deny the future of technology.
But I also can’t hand my life over to it naively.

Even so, when it comes to ferroelectric motors,
I find myself leaning slightly more toward excitement.

> Motors that are less tied to heavy, geographically concentrated resources.
Motors that might stay safely close to our bodies.



In those small rotations,
I see a quiet kind of hope.


—

6. Current Challenges and Limits — Temperature, Speed, Lifetime, and Cost

Up to this point I’ve mostly written about the appeal and potential of ferroelectric motors.
But since we’re committed to “no lies”,
we also need to look squarely at their current limitations.

6-1. Temperature Dependence of Ferroelectric Nematic Liquid Crystals

Ferroelectric nematic liquid crystals
exhibit their ferroelectric phase only within certain temperature ranges.

When the temperature goes out of that range, the material transitions to another phase.

Its polarization and permittivity can change drastically.


For motors built with such materials, that means:

operational stability is strongly tied to temperature,

design must consider the environment’s temperature range,

applications with wide temperature swings (like automotive) are especially challenging.


Current research includes efforts to:

widen the temperature range of the ferroelectric nematic phase,

shift the usable temperature closer to room temperature or other desired ranges.


But we’re still far from having a motor
that “works anywhere, under any conditions.”

6-2. A Modest 40 rpm and What May Come Next

The prototype motor currently spins at about 40 rpm.

For context:

EV traction motors often run at several thousand to over ten thousand rpm.

Industrial motors typically spin from hundreds to thousands of rpm.


Compared to this,
the ferroelectric motor is still at a “baby steps” stage.

Researchers believe they can improve:

rotation speed,

torque output,


by:

increasing drive frequency,

optimizing material properties (polarization, permittivity, viscosity),

refining the motor structure.


But all of these are future challenges.

It would be unrealistic to think that ferroelectric motors
will soon replace main traction motors in EVs or heavy industrial motors.

Instead, they likely fit better in places where:

> “It’s okay if it turns slowly,
as long as it’s light