srms in hev applications comparison of electrical machines for hevs
TRANSCRIPT
SRMs in HEV applications
Comparison of electrical machines for HEVs
SRMs in HEV applications
Wheel loader It weighs over 180 tones 21m³ rock bucket handles a 38
tone payload
141:1 planetary gearbox 300kW / motor 20,000 hours life for the
bearings
SRMs in HEV applications Hybrid bus drive
2x SR drives (50kW and 160kW) One combustion engine (2.5L Di) Low loss Li-Pol battery
No gearbox CO2 emissions lower with 40% Fuel consumption lower with 30%
SRMs in HEV applications
SR drive variator system for Renaul TIVA The two SRMs are not in line any more The gearbox is excluded Infinite gear steps are obtained
The SRMs have 25kW Speed range from 1800rpm to 11000rpm Maximum torque of 135Nm Diameter: 192mm Active length: 160mm Voltage: 425V
SRMs in HEV applications
Starter alternator unit for trucks Power: 30kW Voltage: 340V Torque: 1200Nm
SRMs in HEV applications
Starter alternator technology: 65Nm torque, 2kW power 3kW power in generator regime
Sensorless position control Inverter based on MOSFET tech.
AC InductionBrushless DCSwitched Reluctance
AC Induction
Source: “AC, Brushless, Switched Reluctance Motor Comparisons” James R. Hendershot, Magna Physics Corporation
Brushless DC
Source: “AC, Brushless, Switched Reluctance Motor Comparisons” James R. Hendershot, Magna Physics Corporation
Switched Reluctance
Source: “AC, Brushless, Switched Reluctance Motor Comparisons” James R. Hendershot, Magna Physics Corporation
Source: “AC, Brushless, Switched Reluctance Motor Comparisons” James R. Hendershot, Magna Physics Corporation
Motor Comparison for BEVs & HEVs
PMBDC IM SRM Brushed DC
Speed [rpm] 1000 1000 1000 1000
Torque [Nm] 2866 2866 2866 2866
Max. Speed [Nm] 4000 4000 4000 4000
Torque [Nm] 716 716 716 716
Voltage [V] 380 380 190/300 500
Current [A] 753-486 980-630 1000/500 520
Frequency [Hz] 156 133 500 133
Weight [kg] 300 600 500 1000
Power [kW] 300 300 300 300
Efficiency %@1000 rpm@4000 rpm
9597
9395
9496
8589
Cooling Oil Oil Oil Air
Source: Lightweight Electric/ Hybrid Vehicle Design Ron Hodkinson and John Fenton
In Summary Due to the absence of rotor windings, SRM is very simple to construct, has
a low inertia and allows an extremely high-speed operation. SRM operates in constant torque from zero speed up to the rated speed. Above rated speed up to a certain speed, the operation is in constant power. The range of this constant power operation depends on the motor design and its control.
The brushless DC/AC has the benefit of embedded energy source, high torque densities and high speed rage. Already implemented on the Toyota Prius and Toyota SUV proved to have a good behavior in HEVs
The induction machines are a candidate in the fields of HEVs too. Them manufacture already reached a lot of experience during time and several optimization research activities were performed to push the limits of them performances. Studies proved that using them “in wheel”, like in the case of Audi E-Tron reached the request of fast and easy to control HEV.
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