Geared motor offers simple four-point positioning

Dean Palmer reports on a small, AC geared motor and drive that offers simple, four point positioning and a unique stainless steel hub-to-shaft connector

A small, AC geared motor with integrated drive has been launched recently that offers users simple, four-point positioning in one package. Whereas customers might previously have purchased a geared motor, a variable speed drive and a position controller, with Lenze's new Panasonic B3 users get all three elements in one integrated package. The result is space savings and faster installation times. The positioning drive is built into the back of the motor, although dimensions remain similar to conventional geared motors. Programming of up to four positions is achieved via a keypad or a PC via an RS232 cable. Integrated Hall Effect sensors enable high resolution and positioning accuracy is better than 5° measured at the motor shaft. So, once the gear ratio is applied, this means excellent precision at the output shaft. The motor and drive enclosure is to IP65 for use in damp and dusty areas and no panel space is required. The drive comes in 30, 50, 90 and 130W versions and supply is 200-240V single phase with an option for 100V. And, to enable precise positioning, the B3 gearboxes have exact ratios and rated torques up to 18Nm. Another recent launch from Lenze is a new range of stainless steel hub-to-shaft connectors that look ideal for food machinery and process industries. Developed by Swedish company ETP, these locking bushes avoid the need for keyways, shaft steps, circlips and collars. They connect between shafts and hubs, pulleys, cans and gears with easy setting and adjustment. The joint is backlash-free, easy to unfasten and is re-usable. The ETP-Express version for example, has a single radially-mounted fixing screw, making it very fast and easy to use. It works on the unique ETP hydro-mechanical principle, where the fixing screw pressurises a chamber between the inner and outer walls. These walls expand outwards against the shaft and hub creating a rigid joint. On loosening the screw, the bush returns to its original dimensions and can be dismantled easily.