The document discusses different types of single-phase induction motors, including split phase, shaded pole, capacitor start, and universal motors. It provides details on how each type of motor works, such as how split phase motors use a start and run winding to generate a phase shift for starting torque. Capacitor start motors are also described as having high starting torque and good speed regulation. Universal motors are noted as being able to run on both AC and DC power.

1. Single phase induction motors Jenneson chpt 10.6 p 232

2. Single phase motors Split phase Shaded pole Capacitor motors Universal motors

3. Single phase motors usually have and external starting capacitor. Appliance motor TEFC motor on a resilent mount.

4. www.angelfire.com/mo Stator winding for 1 phase cage motor. Separate start and run windings.

5. www.emerson-ept.com Singlephase motor driving a gearbox.

6. Cap start cap run motor

7. Standard split phase motor www.delviesplastics.com No capacitor. These rely on inductance between the main and axillary (run/start) windings for the phase shift.

8. Cap. Start motor driving a fan in a gas fired burner. Capacitor Fan drum Gas & burner controls.

9. To obtain a starting torque there needs to be some angle between the fluxes. This is achieved by a physical (spacial) displacement plus an electrical angle caused by the phase shift due to the added inductance between the windings.

10. These fluxes are NOT happening at the same instant in time due to the difference in inductance between the start and run windings.

11. The start winding is normally made of finer wire and with fewer turns compared to the run winding. To increase the inductance of the run winding, the run winding is deeper in the core. The run winding has less resistance than the start winding. More current flows in the run winding. Most standard split phase motors have a centrifugal switch to remove the start winding from the circuit after it has run up to about 75% speed. Not all motors have switches, some are designed to leave both windings in the circuit.

12. The number of poles of the motor is the number of poles of the run winding. A 4 pole single phase motor has 4 run winding poles and 4 start winding poles. 120 f p n = P 233

13. Permanently Split capacitor motor Jenneson p 237 Both windings have the same R The phase shift is due to the C.

14. Capacitor motors are the most popular type of single phase motor we find in industry. Cap. Start motors have high starting torque and good speed regulation. Cap. Start cap run motors have very high starting torque and very good running torque due to both windings being in circuit while the motor is running. Read carefully Jenneson p235 & 236 & 237. This is important !!

15. Universal motor http/csd.ijs.si

16. Bearing Brush Commutator Armature Field coil Magnetic circuit Slot insulation Universal motor

17. Shaded pole motor from a washing machine driving the main pump.

18. Series Motor This motor is also known as a universal motor as it will run on both AC and DC. Read carefully Jenneson section 10.7 The motor uses distinct field coils to produce the main fields and a wound armature which produces another field. The 2 fields interact to produce rotation. A commutator is used for switching the armature polarity (field).

19. http;//img.aibaba Shaded pole motor.

20. Flux is growing Flux is decaying P 237 & 238

21. A shaded pole motor has very poor starting torque and a large slip. P 238

22. Check page 240 table 10.2 for a comparison of 1 phase motors.

23. Power, torque and efficiency of 1 phase motors. P = V x I x pf P = 2 x Π x N x T / 60 1 HP = 746W Efficiency = power out / power in x 100