SlimTorq™ Motors

Frameless Motors

The Thinnest & Lightest Torque Motor

  • Ideal for medical, defense & commercial applications.
  • Designed for geared & direct drive applications.
  • Made possible by FiberPrinting™.
SlimTorq™ MotorsSlimTorq™ Motors

The most flexible technology to make frameless motors, enabling infinite design possibilities

  • Slotless for precise motion control.
  • Brushless for reliability.
  • Frameless for minimum weight & maximum compactness.

FiberPrinted™ stator

The motors are based on the proprietary production technology FiberPrinting™.

High power

High precision

>2x acceleration

Safety & agility

Lightweight

Efficient

Low noise and vibrations

SlimTorq™ Motor Specifications

SlimTorq™ Motors

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Technology

MTOW - Octocopter

Outer diameter

25 - 180 mm

Axial length

10 - 40 mm

Continuous torque

0.02 - 15 Nm

Peak torque

0.05 - 100 Nm

Mechanical mass

ID

SlimTorq™ Product Page

Peak thrust

Continuous thrust

Thrust ratio

System Mass

Mass

Speed constant

Torque constant

Design life

Nominal voltage

Download Datasheet
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Halbach rotor

Every component is designed for maximum performance & reliability including the rotor.

Halbach array

Alva’s state-of-the-art Halbach array rotor maximise the magnetic field density

Composite sleeve

A composite sleeve assures failure free operation in any condition

Large OD/ID ratio

Alva’s slotless motor technology results in a thin stator & rotor compared to both slotted motors & other slotless motors, allowing a large inner diameter of the rotor. Other components, for example gears, can more easily be placed inside the frameless motor, to increase overall system compactness.

Technical Specifications

Performance
MTOW - Octocopter
Peak power
Peak thrust
Continuous power
Continuous thrust
Thrust ratio
Design life
Motor
Model name
Speed constant(KV)
Torque constant
0.02 - 15 Nm
Line-to-line resistance
Line-to-line inductance
Stator/Rotor poles
Nominal voltage
Mass
Electrical
Speed constant
Torque constant
Line-to-line resistance
Line-to-line inductance
Stator/Rotor poles
Winding connection
Nominal voltage
ESC
Model name
Rated voltage
Continuous current
Control method
Peak current
Telemetry output
Throttle input
Propeller
Model name
Size
-
Mass
-
Mechanical
Diameter
25 - 180 mm
Axial length
10 - 40 mm
Mass
Drone arm diameter
Environmental
IP-rating
Operating temperature

Thrust tables - 44VDC & 20°C

Ideal for Demanding Application

Medical devices
Defense
Marine propulsion
Wafer Handling Robots

Frequently Asked Questions

How do I mechanically integrate the motor?

There are three general concepts for mechanical integration of the frameless motors.

  1. Clamping
  2. Adhesion
  3. Interference fit

All three has their inherent advantages & considerations, please read more under the Mechanical Integration section of the Product Catalog.

I can’t find the motor size I need, do you offer custom motors?

Most of the SlimTorq™ motors can be ordered with a temperature sensor as an optional feature. Each specific product page in the Product Catalog specifies if it’s available with temperature sensor option under the Temperature Option row. Please the see Ordering Alva Motors section in the Product Catalog to see how you configure your product with a temperature sensor.

What’s the typical delivery time for a standard motor?

Depending on the version of the motor, the lead time may vary. As a general rule of thumb, for units that are standard configurations, the lead time for small volumes (1-5 units) is around 6-8 weeks. For bigger volumes or small customizations the lead time may change, please reach out to us at sales@alvaindustries.com or call us.

Are slotless motors more expensive than slotted motors?

Typically yes, slotless motors tend to be more expensive than slotted motors. The reason lies on the manufacturing methods required to manufacture the windings and the need for more powerful and heavier magnets. However FiberPrinting™ and Alva’s methods of manufacturing our Halbach Array rotors, can be quite competitive with slotted solutions.

Are these motors more expensive than other slotless motors?

No. Alva’s manufacturing methods, lead by the FiberPrinting™ technology, are comparable in cost and price with motors with similar characteristics (thin, light, cogging free slotless frameless motors).

Can I change the specifications of the motors?

The motors can be configured perfectly to your application. There are many sizes to choose from and each size have many options that can be configured to match with you needs.

Almost all the motor come in two main configurations: Lite and Max. Lite is the lightweight option and Max has been maximised in terms of motor constant and torque output.

Each motor has multiple winding configurations to align with your required max-speed. The motors can be configured in Star(Y) and Delta(D), and in different number of series-turns. The cables exit orientation also come in two variants: axial and radial.

The motors can be equipped with temperature sensors and different wire gauges.

To understand how to configure your product please see the Configured To Your Needs section of the Product Catalog and to simplify the process check out our Product Selector.

Please contact us at sales@alvaindustries.com if there isn’t a configuration that meets your needs. Our FiberPrinting™ technology allows us to quickly develop custom motors according to your requirements.

Does the motors come with a temperature sensor?

Most of the SlimTorq™ motors can be ordered with a temperature sensor as an optional feature. Each specific product page in the Product Catalog specifies if it’s available with temperature sensor option under the Temperature Option row. Please the see Ordering Alva Motors section in the Product Catalog to see how you configure your product with a temperature sensor.

How do I select the correct motor for my application?

The easiest way to select correct motor for your application is to use our Product Selector. Insert you requirements in the Product Selector and it will find precisely the right motor for you. It will also allow you to fully configure the motor and order it. We are happy to help if you desire personal assistance to select the right motor, just contact us on sales@alvaindustries.com.

What’s required to drive the motors?

The SlimTorq™ motors are of the three-phase BLDC type & can be driven with most off-the-shelf controllers. The motors can be driven in trapezoidal, FOC, sinusoidal mode & with or without sensor feedback. Special considerations need to be taken regarding the switching frequency due to low inductance of the motors. Please read more under Choosing a Motor Drive section of the Product Catalog.

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