CONTENTS ix
PAGK
speeds of a couple of unequal motors—Internally concatenated
motor........................40
19. Generator equation of concatenated couple above half syn-
chronism—Second range of motor torque near full synchron-
ism—Generator equation above full synchronism—Ineffi-
ciency of second motor speed range—Its suppression by
resistance in the secondary of the second motor.......41
30. General equation and calculation of speed and slip of con-
catenated couple....................42
31. Calculation of numerical instances............44
32. Calculation of general concatenated couple........45
33. Continued.......................46
34. Calculation of torque and power of the two motors, and of the
couple..........................47
35. Numerical instance...................48
36. Internally concatenated motor—Continuation of windings into
one stator and one rotor winding—Fractional pitch—No inter-
ference of magnetic flux required—Limitation of available
speed—Hunt motor....................49
37. Effect of continuation of two or more motors on the character-
istic constant and the performance of the motor.......50.
CHAPTER IV. INDUCTION MOTOR WITH SECONDARY EXCITATION.
38. Large exciting current and low power factor of low speed in-
duction motors and motors of high overload capacity—
Instance........................52
39. Induction machine corresponding to synchronous machine ex-
cited by armature reaction, induction machine secondary corre-
sponding to synchronous machine field—Methods of secondary
excitation: direct current, commutator, synchronous machine,
com mutating machine, condenser ............53
40. Discussion of the effect of the various methods of secondary
excitation on the speed characteristic of the induction motor . 55
Induction Motor Converted to Synchronous
41. Conversion of induction to synchronous motor—Relation of
exciting admittance and self-inductive impedance as induction
motor, to synchronous impedance and coreloss as synchronous
motor—Danielson motor................57
42. Fundamental equation of synchronous motor—Condition of
unity power "factor—Condition of constant field excitation . . 60
43. Equations of power input arid output, and efficiency .... 01
44. Numerical instance of standard induction motor converted to
synchronous—Load curves at unity power factor excitation and
at constant excitation..................02
• 45. Numerical instance of low speed high excitation induction
motor converted to synchronous motor—Load curves at unity