[D0101AAC], Letter from General Electric Co, Frederick Mason Kimball to Thomas Alva Edison, November 15th, 1901
https://edisondigital.rutgers.edu/document/D0101AAC
Transcription
[crossed out Marginalia] <Await arriving motors than give me this letter acknowledge receipt of motors when they come> Mr. Thomas A. Edison, Llewellan Park, Orange, N.J. Dear Sir:- Alluding to our conversation on the occasion of my recent visit to you with Messrs Hughes and Beach,-I desire to say that I have arranged to send you, for trial, two automobile motors,-one a GE-1007 and one a GE-1005; and also an S-11 controller,- in order that you may examine and try this apparatus thoroughly. As I said to you,-we have not hesitated to put enough material into these machines to allow great sturdiness of design, mechanical strength and reliability,-and we have aimed to supply sufficient material in our magnetic and electric circuits so that the molecular activity may be comparatively low at normal outputs, and the motors have all been built to withstand very large overloads without material decrease in efficiency without sparking and without heating. You will find the GE-1007 motor, giving about 76.5% efficiency at normal load,-or a little more,- and the GE-1005 giving about 81% at normal load. You will also find that these efficiencies are well maintained at 150% overload. You will find the brake horse power to be fully up to the rated amount and you will also find, I believe, that these motors,-considering that they are series wound motors,-lack to a marked degree the fault of lying down in speed and torque when heavy grades or other severe service is encountered. The normal winding of these motors is for 85 volts; the GE-1007 is rated for .87 HP and the GE-1005 for 1.48 HP. I would call your attention particularly to the substantial construction of the armatures, field coils, etc., and to the ease of making such repairs as may, at times, be necessary, in any automobile motor. While most other makers are still regarding as dominant factors in design, exceedingly light weight with high normal efficiency only,- we have endeavored to look at the business from such a commercial standpoint as will obtain, two or three years hence, and are making motors more nearly conforming to street car practice in weight,-looking for high average efficiency at normal and heavy overloads. Yours very truly, Fred M. Kindall