Motor Design
Magnet-free, sensorless and efficient
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Motor Control
Taking control to the next level
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Inverter Design
Fast switching and low loss
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Our Inverters

Our inverters use the latest technology to achieve the fastest switching and the lowest loss. They work perfectly in harmony with our motors.

Our Motors

A great motor needs great design and great control. We bring it all together to produce a motor that will fulfill your needs.

Our Solutions

We are one of the few companies in the the world that can bring the electronics and motor design together for a complete package. Have a look at some of our featured projects below.

Our Patents

With over 50 international patents our innovative technology is protected, take a look below for some of the work we've done.

There is described a system for measuring an environmental parameter such as temperature experienced by a resistive component such as a thermistor (107) in a galvanically isolated circuit, or for measuring the voltage developed by a component. The system comprises a measurement circuit (1) comprising a voltage pulse generator (114). The measurement circuit is inductively coupled to the galvanically isolated circuit by a flyback transformer (101) such that a stable voltage (V104) across a first capacitor (114) in the measurement circuit after many voltage pulses is proportional to a stable voltage (V106) across a second capacitor (106) connected across the component in the galvanically isolated circuit. The stable voltages across the first and second capacitors are adjustable by adjusting a duty cycle of the voltage pulses.

There is described a synchronous reluctance machine having a plurality of poles and comprising a stator with a plurality of spaced slots and a rotor. The rotor has one direct axis and one quadrature axis for each pole and comprises a plurality of flux barriers, each extending to a circumference thereof at least one barrier point. Successive angular separations between barrier points around the circumference of the rotor increase or decrease when moving around half a pole pitch from an initial axis to an adjacent finishing axis, the initial axis being one of a direct axis or a quadrature axis and the finishing axis being the other of a direct axis and a quadrature axis. The increase or decrease in size may be governed by a systematic progressive series.

A control system for an electronically commutated motor (401) can rotate smoothly to very low speeds without using a high resolution encoder and can respond to variations in load without excessive speed fluctuations. The control system can be applied to motors operating with low resolution encoders and motors operating with sensorless rotor position feedback. The electronic control system can vary the magnitude and frequency of the stator excitation applied to one or more stator phase windings, the electronic control system comprising a frequency setting section (402) and a magnitude setting section (403) characterized by the fact that the frequency setting section (402) is constrained to operate over a limited range of frequencies, the maximum frequency being a function which is closely related to the frequency associated with rotation of the rotor at the desired speed.

Disclosed herein is a design for flux switching machines with one or more armature windings which can deliver controlled torque, in either selected direction on start up, without the use of a mechanical position sensor. Flux switching machines without sensors can operate equally well in either direction. The invention discloses design features for such machines which improves the torque profile of the motor with angle. In three phase machines this delivers higher torque and lower ripple torque. In single phase flux switching machines the invention allows the rotor to be placed in a position where maximum torque can be delivered in either direction by selection of either positive or negative armature current. Rotor slotting is introduced to create a path of low permeability across a rotor tooth with minimal impact on the normal torque producing flux paths. Asymmetry of stator slots is used to further create a stable rotor position when energized by predominantly field means or armature means.

A power supply circuit having at least two conversion stages wherein the first conversion stage includes input terminals for connection to an ac or dc supply, an electronic converter with constant output current characteristics and output terminals for connection to at least one second conversion stages. Each second conversion stage includes input terminals to receive a substantially constant current input from a first conversion stage, current multiplier circuit and output terminals for connection to a load. The electric converter of the first conversion stage is a high frequency resonance converter having a series parallel resonant converter with an inductance connected in series with a capacitor. The output terminals for connection to the second conversion stage are connected across the capacitor and the inductance. Circuits are particularly suitable for lighting applications, for controlling the large number of LEDs in LED display panels or in backlighting for televisions and LCD displays.

Disclosed herein is a design for flux switching machines with one or more armature windings which can deliver controlled torque, in either selected direction on start up, without the use of a mechanical position sensor. Flux switching machines without sensors can operate equally well in either direction. The invention discloses design features for such machines which improves the torque profile of the motor with angle. In three phase machines this delivers higher torque and lower ripple torque. In single phase flux switching machines the invention allows the rotor to be placed in a position where maximum torque can be delivered in either direction by selection of either positive or negative armature current. Rotor slotting is introduced to create a path of low permeability across a rotor tooth with minimal impact on the normal torque producing flux paths. Asymmetry of stator slots is used to further create a stable rotor position when energised by predominantly field means or armature means.

An electrical machine for converting electrical energy into mechanical energy and/or mechanical energy into electrical energy, including at least one rotor position sensor device configured to undertake the steps of measuring an electrical signal during a switching cycle in an end region, and comparing the measurement with at least one similar measurement in at least one previous switching cycle to determine if a known rotor position has been reached.

The present invention relates to control of electrical motors and in particular, to the design and control of reluctance motors capable of micro-stepping position control. According to the invention there is provided a single stack variable reluctance machine with salient stator teeth and salient rotor teeth, the stator further comprising field magnet sections created by either permanent magnets or field windings or a combination of permanent magnets and field windings, and further comprising armature windings connected to form at least two armature phase windings, the armature phase windings connected to a power source or power electronic inverter for the supply of positive and negative current to at least two armature phase windings such that the rotor rotates in small incremental steps in response to small changes in the current in one or more of the phase windings.

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