Since the official manual is nearly unobtainable, here is a to check your work on Hubert problems.

"Electric Machines" by Charles Hubert is a comprehensive textbook that covers the fundamental principles and operation of electric machines. The textbook covers topics such as:

: A 10-kW, 220-V, 3-phase, 4-pole, 50-Hz induction motor has a slip of 0.05. Determine the rotor speed.

Because the manual is rare, you must leverage human networks.

The solution manual focuses on numerical problems. For conceptual ones, form a study group and debate answers. Use the manual’s numerical insight to reinforce concepts (e.g., why does a deep-bar rotor have higher starting torque? The manual’s calculation of rotor resistance at slip=1 will show you).

To appreciate the value of the solution manual, let’s examine the toughest chapters in Hubert’s book.

| Chapter | Topic | # of problems solved | Typical depth | |---------|-----------------------------|---------------------|----------------| | 1 | Magnetic Circuits | ~15 | Full derivations | | 2 | Transformers | ~22 | Phasor diagrams + numerical | | 3 | Electromechanics | ~12 | Energy method steps | | 4 | DC Machines – Principles | ~18 | Commutation analysis | | 5 | DC Motors & Generators | ~25 | Speed-torque curves | | 6 | Induction Motors – Theory | ~20 | Equivalent circuit | | 7 | Induction Motor Performance | ~20 | Circle diagram method | | 8 | Synchronous Machines | ~18 | V-curves, power angle | | 9 | Single-Phase Motors | ~14 | Cross-field theory | | 10 | Special Machines (Stepper, BLDC) | ~10 | Step response | | 11 | Machine Control & Drives | ~12 | SCR/DC drive calcs | | 12 | Transients & Dynamics | ~8 | Diff eq solutions | | 13 | Machine Selection | ~6 | Economic analysis |

This is a complex request because (often just called Hubert) is a classic, rigorous textbook, but it is notorious for not having an official, widely-available solutions manual.