Electric Motors and Control Techniques

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Electric Motors and Control Techniques
Electric Motors and Control Techniques

by: Irving M. Gottlieb

Topics include: reluctance synchronous motor, bipolar windings, reluctance stepping motor, attain synchronous speed, repulsion motor, speed control range, improving commutation, regulating pulse width modulator, germanium power transistors, sequential stepping, exotic batteries, brush axis, speed control circuit, shorted armature, main field winding, azimuth dial, armature loops, main field flux, near constant speed, compensating windings, unipolar drive, generator action, interpole windings, programmable output, starting winding

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First Sentence:
THE APPLICATION OF ELECTRONIC CONTROLS TO ELECTRIC MOTORS AND GENERATORS has the appearance of a mere merger of two somewhat divergent practices of a common engineering discipline.

Book Description
Get greater flexibility, reliability, and reduced energy consumption from household appliances to automobiles. This book will show you how different types of motors operate and how electronic control devices can be used to improve efficiency in a wide range of applications. You'll get in-depth, updated coverage of: Electric motor control applications; dc and ac motors; Digital motors; Commutator-type motors; Noncommutator-types motors; Electric vehicles.

Overall I found this to be an excellent book. I enjoyed every page, and in particular tracing out circuit operations of the various schematics. I thought the diversity of circuits was great.

Nowhere in the title did I see "Basics of" or Fundementals of". This is not a book for the novice. The reader must have a good understanding of AC and DC motors, and solid state theory, circiuts, and devices.

I found the concatenation of induction motors, and the Kramer speed control system very interesting. I have many old industrial control books, but none shows these systems.

There are several errors, and examples of such are: Page 44, Para 3 is completely wrong. The proper way to reverse direction of compound motors is to reverse A1 and A2. Page 57, para 2 relates to this proper method. Fig. 5-9 Q102 shows a JFET- should be a UJT. Fig. 5-13 Q1 same thing. Fig. 5-10 has negative 250 VDC lines to emitters of Q532-Q536 and Q552-Q556 missing. Eliminate lead from motor to bottom of C541. Fig. 6-11 motor will never reverse with this scheme. Turning dial in opposite direction FWD biasis Q2 turning on Q1 which energizes RY2. RY1 drops out turning system off. Motor never runs CCW.

I have a comprehensive technical library, and one of my books is by this author entitled "Design and Operation of Regulated Power Supplies". It's an old book, and it's full of solid state circuits. I am indebted to authors like Mr Gottlieb, for it's their writings that enabled me to learn solid state electronics.


The book is good in giving a general (although a little dated) overview of motor types and control techniques. Unfortunately they are too special for a layman to understand and too general for a specialist to really do something with it. I have found the book a little disappointing, because it is assuming things without ever explaining them.

I had the impression, that the author had more interest in displaying the scope of his knowledge instead of helping someone else to get to the same level of understanding.

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