tailieunhanh - Lightweight Electric Hybrid Vehicle Design Episode 6

Tham khảo tài liệu 'lightweight electric hybrid vehicle design episode 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 72 Lightweight Electric lybrid Vehicle Design Typical machine specification for 60 kW 10 000 rpm surface mounted would be stator OD 10 in rotor diameter 7 in active length 3 in operating point tesla at 666 Hz 8 poles 380 V 103 A efficiency power factor 1 winding resistance Q L L winding inductance 300 mH L L iron loss kW at 666 Hz core Transil 270 mm non-orientated load torque 57 Nm peak torque 150 Nm vector control current 100 amps for tesla. IRONLESS PM SYNCHRONOUS MOTOR This machine has been developed by UNIQ USA for hub mounted motors for use in electric vehicles. It consists of a machine with both an internal and external rotor which are mechanically linked and a thin stator winding which is usually fabricated using printed circuit techniques. The result is a lightweight machine with a very high power density and low winding inductance since there is no stator iron. Performance is largely determined by the quality of permanent magnet used. The d-axis reluctance is high due to the double air gap so that the currents needed for vector control can be large compared with a conventional PM machine. Such machines have been built up to 40 kW rating at 7500 rpm with epicyclic speed reducers that are wheel-mounted. At present such machines are costly to manufacture because of the large amount of PM material involved which has to be of the cobalt neodynium variety to achieve good performance. Losses are all due to stator copper which is generally operated at extremely high current density to give a very thin stator. . 7 WOUND ROTOR SYNCHRONOUS MACHINE WITH BRUSHLESS EXCITATION This machine is sometimes used for inverter drives in addition to the well-known use as an electricity generator. The presence of the exciter rectifier means that this solution is applied at higher powers. The rotor can be salient pole or of surface slot construction at high speed. Whichever solution is chosen the full field thermal loss in the motor is .