John D Edick

US Patent:

41106768, Aug 29, 1978

Filed:

Aug 30, 1976

Appl. No.:

5/718798

Inventors:

John D. Edick - Wickliffe OH
Kenneth A. Ostrander - Columbus OH

Assignee:

Reliance Electric Company - Cleveland OH

International Classification:

G01P 342
H02K 2112
H02K 1600

US Classification:

322 31

Abstract:

A speed sensing tachometer is built into the end bracket or end bell of a variable speed dynamoelectric machine such as a DC motor. The tachometer is completely recessed and close to the bearing supporting the shaft to occupy a minimum of longitudinal space in the machine. Multiple poles are provided on the rim of the tachometer rotor fastened to the machine shaft and these poles cooperate with first and second Hall effect switches. An electrical circuit is also provided in the same recess in the end bracket and connected to the Hall switches so that the output from the stator of the tachometer includes both a digital and an analog signal output with rotational direction sensing. Such built-in tachometer permits the DC motor to be a double shaft extension motor so that a load, fan or brake may be mounted at each end. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.

US Patent:

43318959, May 25, 1982

Filed:

May 18, 1979

Appl. No.:

6/040134

Inventors:

John D. Edick - Wickliffe OH
Paul K. Doering - Massillon OH

Assignee:

Reliance Electric Company - Cleveland OH

International Classification:

H02K 132

US Classification:

310 61

Abstract:

A squirrel cage rotor, and a lamination is disclosed, wherein cooling ducts and passages are provided in the rotor. A first rotor section may be of standard laminations and only one type of duct section has radially extending passageways between fingers. The entire duct section is made from a plurality of laminations having such fingers radially extending from the central core portion of the individual laminations so that the radial passageways extend to the inner wall of longitudinal ventilating ducts. In the outer ends of each finger a rotor bar aperture is formed so that the finger is a casing for such rotor bar. Initially, each duct lamination has a unitary bridge at the outer periphery joining adjacent fingers to add rigidity to the fingers. The assembled stacks of laminations making the two rotor sections are then cast with molten metal, e. g. , aluminum, under low pressure to form a squirrel cage.