Household electrical appliance operable at more than one A.C. frequency

• US 6,710,571 B2
• Filed: 04/08/2002
• Issued: 03/23/2004
• Est. Priority Date: 04/18/2000
• Status: Expired due to Fees

• Current Assignee: BSH Balay S.A. (Robert Bosch GmbH)
• Original Assignee: BSH Balay S.A. (Robert Bosch GmbH)
• Inventors: Menendez Fernandez, Maria Del Carmen
• Primary Examiner(s): Nappi, Robert
• Assistant Examiner(s): COLON SANTANA, EDUARDO
• Application Number:
  US10/018,380
• Publication Number:
  US 20020113567A1
• Time in Patent Office: 715 Days
• Field of Search: 318/700, 318/709, 318/720, 318/721, 318/722, 318/723, 318/724, 318/254, 318/439, 318/138, 318/139, 318/713
• US Class Current: 318/709
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02P 4/00 Arrangements specially adapted for regulating or controlling the speed or torque of electric motors that can be connected to two or more different electric power supplies vector control H02P21/00

Abstract

A household electrical appliance for a.c. operation includes a synchronous motor, a dropping resistor, and a device for inserting the dropping resistor. The synchronous motor is rated at a first frequency. The device inserts the dropping resistor in series with the synchronous motor for operating the synchronous motor at a second frequency.

Claims

1. A household electrical appliance for a.c. operation, comprising:

an inductor having adjustable impedance, said inductor being controllable to increase its value for insertion purposes and

a dropping resistor; and

a device for inserting said inductor in series with said synchronous motor for operating said synchronous motor at a second frequency.

2. The appliance according to claim 1, wherein said device for inserting said inductor is a bypass being open for purposes of insertion.

3. The appliance according to claim 1, wherein said device for inserting said for inductor is manually activated.

4. The appliance according to claim 1, including a device for detecting the frequency of a connected a.c. supply, said device inserting said inductor depending upon the detected frequency.