Dishwasher pump drive

US6775468B2 · kind B2 · utility

Assignees

• Diehl AKO Stiftung & Co. KG · DE
• SISME Societa Italiana Statorie Motori Ellettrici S.p.A. · IT

Inventors

• Michael Zinke · Schallstadt, DE
• Werner Kaps · Weiler-Simmerberg, DE
• Thomas Schlosser · Weingarten, DE
• Pietro Navarra · Malnate, IT
• Bruno Greco · Malnate, IT

Key dates

• Filing date: Aug 12, 2002
• Grant date: Aug 10, 2004
• Expiry date: Aug 12, 2022

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02P6/14
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

For their pump drive dishwashers are usually equipped for reasons of cost only with an unregulated asynchronous motor which however is temperamental in terms of the sealing requirements involved, and a simple controller operating circuit (13) for executing the functional program because a rotary speed-controllable drive could not comply with the price limit which is preset by the market. However rotary speed control would be highly desirable in terms of the level of efficiency, energy demand and the generation of noise. In order to embody a dishwasher with a pump drive which involves a low level of wear and which is controllable in respect of its rotary speed without a substantial increase in cost, the use of a dc motor (11) with field windings (19) which can be alternately supplied with current by way of sensor-controlled switching sections (34) is an optimum. In that case a commutator (18) which is responsive to the polarity of the multi-pole permanent-magnetic rotor (17) which is supported in the form of a wet rotor member in the air gap predetermines which of the field windings (19) is to be actuated at the time. Hum phenomena by virtue of the residual ripple of the dc field vo…