Brushless direct current machine and method of controlling the same

• US 4,035,699 A
• Filed: 01/22/1974
• Issued: 07/12/1977
• Est. Priority Date: 11/10/1971
• Status: Expired due to Term

• Current Assignee: Walter Schade
• Original Assignee: Walter Schade
• Inventors: Schade, Walter
• Primary Examiner(s): Schaefer, Robert K.
• Assistant Examiner(s): Feldhaus, John J.
• Application Number:
  US05/435,583
• Time in Patent Office: 1,267 Days
• Field of Search: 318/138, 318/198, 318/199, 318/254, 318/171, 318/439
• US Class Current: 318/400.41
• CPC Class Codes: H02K 3/28 Layout of windings or of connections between windings windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32
• CPC Class Codes: H02P 6/14 Electronic commutators

Abstract

In a brushless D. C. motor which is controlled by electronic circuits, the armature which is of the shorted drum type, is constructed in the form of a double or multiple coil winding which acts to prevent high circuit interruption potential which might damage the electronic control circuits. The double or multiple winding may be constructed as a double or multiple conductor winding. The multiple windings are separate one from the other and are connected together to supply terminals through the electronic control circuits.

Claims

1. A brushless direct-current machine having a rotor comprising:

a plurality of at least four stationary coil windings connected in a loop;

a plurality of switching means at least equal in number to said plurality of stationary coil windings for sequentially connecting said coil windings to a source of direct-current electrical energy;

quenching means responsive to the energization of at least one of said switching means for connecting a next coil winding to said source of direct-current electrical energy to sequentially quench the energized switching means; and

a plurality of substantially identical timing networks independent of any mechanical connection to the rotor to which a common voltage is applied for cyclically activating each of said switching means at a cycle speed dependent upon the magnitude of the applied voltage, said windings comprising at least double-parallel coil windings insulated from one another.