Rotalink Ltd

Rotalink offers an extensive and growing catalogue of power transmission and control products including AC synchronous and shaded pole motors, brushed and brushless DC motors, permanent magnet and hybrid stepping motors, gearboxes up to 15Nm and auxiliary products ranging from encoders to lead screws.

Our own cost driven manufacturing facility has a varied process capability including injection moulding, coil winding and CNC turning. It utilizes the latest CAD technology and is supported by a number of worldwide partnerships. Our multi-disciplined sales and engineering team will work with you to produce the most effective solution for your application.
 

Permanent Magnet Brushed DC Motors

The simple permanent magnet brushed dc motor is an impressive component. Continuous improvement has delivered powerful and flexible performance at the very lowest cost.

Advantages of a brushed dc motor include low initial cost, high reliability, and simple control of motor speed.

Permanent Magnet Brushed DC Motors

Brushless DC Heavy Case Motors

Heavy case brushless motors are built for the most demanding
applications. Their solid construction gives unparalleled efficiency and lifespan and low levels of electrical and audible noise. They are too powerful to use built-in commutation, and so feature cables to connect them to Rotalink's BLC4A board or to a customer's own electronics.

Brushless DC Heavy Case Motors

Brushless DC Pressed Case Motors

Pressed case brushless motors bring brushless technology to
applications traditionally limited by cost of brushed motors, greatly increasing lifespan. Built-in commutation makes them a drop-in replacement for brushed motors, whilst at the same time providing speed feedback and control.

Brushless DC Pressed Case Motors

Rare Earth DC Motors

Rare earth magnet motors can be a cost effective option when high speed, high power density, long life or small size are important. This low cogging motor range offers greater power compared with other brushed motors of the same volume. This is achieved using very thin Neodymium magnets and high density windings.

Rare Earth DC Motors

Gearboxes

Our innovative gearbox design expertise together with today’s materials have been combined to maximise the full output power generated by this widest range of motors in the most price sensitive way. Each gearbox type is offered with many ratios, torque of 10mNm to 20Nm is achievable through the range with speeds peaking at 500 rpm.

Low noise and extended life are characteristics that are high on our agenda.

Gearboxes

Incremental Encoder

In order to support OEMs in their determination to maintain a competitive edge we have developed an ASIC based dual channel encoder. It uses capacitive sensing, which delivers cost effective feedback whilst minimizing size.

The capacitive design and custom ASIC, means the encoder can successfully operate over a wide range of temperatures and is unaffected by external magnetic forces. The ASIC has internal amplification and can directly drive TTL logic.

Various options of the encoder are available from 8ppr single channel to 24ppr dual channel(giving 48 positions per rev with signal processing).

A 300mm loom is available to link the encoder to a standard 2.54mm pitch 4-way PCB header. In full production the encoder connector allows customers to easily use a loom tailored to their requirements.

For our PG28 and PG38 planetary gearboxes the encoder fits neatly in place of a planetary stage, minimising length.

For use with our ovoid gearbox range there are three different size variants, providing a sandwich mount between our standard single shaft dc motors and gearboxes.

Incremental Encoder

Absolute Encoder

Magnetic Absolute Encoder

Rotalink's magnetic absolute encoder uses hall effect based
electronics to produce the same analogue output from a smaller package. It also gives the option to report position via SSI (synchronous serial interface), which is immune to the noise that can disrupt an analogue output.

Mechanical Absolute Encoder

A mechanical absolute encoder - commonly known as a potentiometer - is the simplest way track shaft movement over one or ten turns. Its resistance rises as the gearbox turns, providing an analogue signal. The single-turn version drops back to its minimum resistance (~30Ω) when a full rotation in completed. The multi-turn version increases to maximum resistance over 10 turns, then hits an end stop.

Absolute Encoder

DC Programmable Controller

The Red Drive board was designed with cost at the forefront of the specification and manufactured in volumes that deliver this promise.Use Red Drive throughout the product development process.

  • Write your own programs and modify them, at any stage, quickly and easily.

  • Prototype test and modification.

  • Compatible through pre-production and production stages.

  • Design with Red Drive PCB with the option of a Red Drive chip on your own board.

Red Drive is a compact yet powerful motor driver and controller designed for use with our wide range of dc motors, gearboxes and encoders. Our unique flowchart graphical software allows the user to easily program both simple and complex sequences of motion and quickly refine such programs as development continues.

The Red Drive chip can be incorporated into a customer's own PCB, providing advanced PID control and complex programmed behaviour without the need for further design time. When volumes are moderate or timeframes tight, Rotalink also offers Red Drive on a fully integrated PCB.

This will turn a brushed dc motor, when equipped with a well designed gearbox and feedback device, into a servo system able to produce more power using less space and for a lower price than an equivalent stepper or brushless motor.

Red Drive is engineered to make closed-loop speed, acceleration and positional control possible in the most price-sensitive applications. It can respond to both analogue and digital inputs and give outputs to control LEDs, buzzers and similar devices.

DC Programmable Controller

Speed Controller

A range of open loop Pulse Width Modulated speed and direction controllers for use with brushed dc motors up to 10A.

All our controllers use PWM adjustment running at 20Khz to provide high quality speed control. The motor will see an average voltage proportional to the duty cycle it is receiving.

There are 3 variants of controller, a 10A uni-directional (varies speed only) unit, a 1.5A bi-directional controller (varies speed and direction) and a 1.5A uni-directional (varies speed only) unit.

Bi-directional unit:
Using the onboard potentiometer it is easy to adjust direction and speed; with the potentiometer set full CW the motor turns clockwise at full speed, simply rotating the potentiometer to full AC will rotate the motor anticlockwise at full speed. Positioning the potentiometer at 50% will stop the motor.

Uni-directional unit:
More simple than the bi-directional controller. This PCB simply provides speed control in one direction. The potentiometer changes speed linearly from full speed to stop. The motor connection must be reversed to change direction.

Speed Controller

AC Synchronous Motors

Our range of ac synchronous single and reverse direction motors offer geared torque up to 4Nm. The direction of rotation is electrically switched or controlled by long-life mechanical anti-return devise. UL approved options are available. These long life motors are suitable for use in medical equipment, valves and pumps.

AC Synchronous Motors

Permanent Magnet (PM) Stepping Motors

Often referred to as a “tin can” the permanent magnet step motor is a low cost, low resolution motor. Our range of 25-55mm diameter uni and bi polar motors offer geared torque up to 10Nm with typical step angles of 7.5° to 15° (48–24 steps/revolution).  

Permanent Magnet (PM) Stepping Motors

Hybrid (HB) Stepping Motors

The hybrid stepper motor provides higher step resolution, torque and speed performance than a PM stepper motor. We have an extensive range of HB motors up to Nema size 23 in uni and bi polar windings with step angles of 3.6° to 0.9° (100 – 400 steps per revolution). Our stand alone SM02 unipolar drive offers low cost control up to 1A per phase.

Hybrid (HB) Stepping Motors

Customisation

Rotalink's website is presented in prime component form enabling the user to satisfy their application needs with a drive system produced from standard components customised to their application.

We understand that systems may need unique features at the point at which they interface with your machine. Typical areas that may be customised are:

  • Output shafts

  • Flying leads and looms that may include strain relief, crimps, heatshrink and connectors

  • Special gears, pinions or pulleys fitted to output shafts

Rotalink offers optional friction clutches that may be built into the gearbox output stage across the spur ovoid gearbox range.

These devices provide protection to the gearbox and/or driven load where shock loads or intermittent overloads could otherwise cause damage to the system. The clutches are set at manufacture to operate at the required torque level.

Our sales team are always available to assist customers at the specification stage, samples and pre-production quantities can be supplied.

We do offer a design and supply service for applications that demand a totally unique power transmission or control system

Customisation

Services To OEMs

A centre of excellence for the design and supply of miniature power transmission products.

There are times when you will have a specification that can only be met by a unique solution. We have considerable experience of working on such projects offering specialised design expertise supported by a first class prototyping capability.

Our flexible approach involves understanding your needs in terms of specification, cost, timing and finance at the outset. This enables us to deliver you a design and supply service that is uncompromising.

Our design philosophy carries a triple message:

  • Take known technologies and repackage them in fresh and novel ways

  • Awareness of the opportunity presented by today’s materials

  • Cost and quality established at the design stage

Being quick to adopt both commercial and technical advances ensures that we can support you in your determination to be a market leader.

Areas where we may be of special help include:

Cutting time to market
We actively develop and maintain our relationship with your project management team. Our unique blend of experienced, multidisciplined engineers use the latest 3D modelling software and in house prototyping facilities to deliver motion control products to your project timelines.

Product cost
Price is a critical driver, and imaginative design is the key to low cost. Our catalogue is proof of our ability to deliver products that meet this market test. We operate at a global level, and source in the most appropriate locations to deliver a real edge in the marketplace.

Design and development cost
We are always prepared to consider creative ways of moving a project forward, and we are committed to joining you in realising your market advantage.

Tooling, a positive stance
If you prefer to delegate the responsibility and cost of your tooling to a key supplier you can rely upon our support.

Volumes
Market projections are volatile. We recognise this and join with you as you develop your market.

From prototypes to full scale supply
A first class multi-disciplined manufacturing capability enables us to deliver prototypes, preproduction, and where possible, full supply programmes.

Services To OEMs

Rotalink Ltd Overview

0 PRODUCTS / SERVICES
0 EMPLOYEES
- YEAR FOUNDED