Both brushed and brushless PMW motors are used in many industries. Examples include machining centres, semiconductor manufacturing positioning systems, winders and rewinders in the paper industry, vacuum and other environmental chambers and ovens.
For test and measurement equipment, they can be found in materials testing machines, coordinate measurement machines, sample preparation and polishing devices and other inspection devices. In the field of precision positioning systems, they are used to drive the pan and tilt mechanisms of radio telescopes, coastal and mobile radar dishes and devices for turning turrets.
Application: a low profile conveyor drive
PMW developed a brushless DC electric motor with gear and drive (motor controller) for a conveyor drive that was part of a handling system for high volume machining cells. The system had to carry heavy automotive components to and from each of the machine tools.
The client needed compact motors that would fit inside the conveyor frames, to replace existing motors that projected beyond the frame.
The IR16 brushless DC motor was designed to be as efficient and as short as possible. Savings in length were achieved by integrating the output face of the motor with the input side of the gearbox. The motor was matched with the high precision gearbox so that both were suitable for over 50,000 hours running.
Printed Motor Works’ phase-gated process to design the motor included systems engineering, electromagnetic modelling, mechanical design, and selection of specialist subcontractors, followed by manufacture, assembly and test.
The custom gearbox was developed with a specialist partner company, using steel casing materials, fine tolerance machining, high precision bearings and a lubrication regime to achieve 50,000 hours between oil changes. The bespoke drive was developed with a specialist partner company to minimise current consumption when running.
Application: a servo assisted brake for London Underground
PMW has supplied hundreds of brushed pancake motors in its GPM series that are being used to control the release of braking systems in the London Underground rail system.
The GPM16 was chosen because it is axially very compact, its components are suitable for use in high temperature environments and it is fitted with a safety brake so that in the event of system power loss, the main brake remains applied.