tailieunhanh - Lightweight Electric Hybrid Vehicle Design Episode 5

Tham khảo tài liệu 'lightweight electric hybrid vehicle design episode 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 52 Lightweight Electric lybrid Vehicle Design resistivity. The magnets are retained by a prestressed carbon fibre ring of mm wall thickness. The generator has a 4 pole configuration and the machine winding is designed to give 165 V RMS at 150 000 rpm. resulting in a line current of 42 A at 10 kW. An advantage to this method of construction is that the generator may be built and tested separately from the turbine. The turbine rotors will be only 40 mm outside diameter and machined from aluminium. The rotors are held to the shaft by Loctited nuts and there is a hole down the centre to facilitate temperature measurement. One of the nuts contains the fork for the drive coupling. The design of these stages with their casing and expanders is confidential. The heat exchanger is an air to air unit rated for 30 kW at a temperature of 600 C. The same unit also functions as an exhaust silencer for the engine and special construction techniques are required to resist the high temperature of the exhaust from a Wankel engine typically 1000 C . Polaron envisage a battery of 216 V nominal varying between 180 V and 255 V. The speed of the turbine may vary over the entire range but meaningful output will only occur between 120 000 and 150 000 rpm. The turbine Fig. is started by a transistor bridge connected across the diode bridge and as the compression of inlet air starts and is expanded the output turbine takes over supplying rotational power and the transistor bridge is then used as a switching regulator to match the generator voltage to the battery voltage. Sensorless timing techniques are possible but it is simpler to use three Hall sensors operating from the rotor field system. 165 V AT 150 000 RPM 5 KHZ IGBT TRANSISTORS REVERSIBLE POWER FLOW 245 V DC Fig. Turbine recovery system and recuperator power control. Viable energy storage systems 53 You might ask Why not let the load line of the turbine generator intersect with that of the battery on an open loop basis