Wheel Motors
External Rotor Wheel Motors for Electric Vehicles
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| The MBW400 is a sophisticated liquid-cooled permanent magnet synchronous motor for direct-drive use in vehicle propulsion.
The basic design is ideally suited to OEM products for a wide variety of applications where the external rotor and compact internal stator deliver a maximum torque-to-weight ratio at low rotation speeds.
In the first operating range, the motor delivers a constant torque from zero up to the base speed. The motor supply holds a constant voltage as the RPM and frequency increase, reaching maximum supply voltage at the base speed.The MBW400 is uniquely suited to applications where the external rotor serves as the base wheel mount. The motor produces almost no rotor heat, and negligible electromagnetic losses. Any minimal power loss in the stator is distributed in the stator winding and core.
In the second operating range from the base speed to the maximum speed, the motor operates under “flux weakening” conditions. In this range the mechanical power is constant as the output torque follows a hyperbolic decrease. Again, the supply voltage is held constant as the RPM and frequency increase.
The MBW400 is uniquely suited to applications where the external rotor serves as the base wheel mount. The motor produces almost no rotor heat, and negligible electromagnetic losses. Any minimal power loss in the stator is distributed in the stator winding and core.
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| Wheel Motors Specifications |
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Specifications
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Traction Motor Type
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Synchronous Permanent Magnet
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configuration
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cup-type external rotor, random wire inner stator
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maximum external diameter
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400 mm
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maximum axial length
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200 mm
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base electric speed
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325 rpm
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base mechanical speed
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325 rpm
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maximum speed
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600 rpm
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rated mechanical power at 325 rpm
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22 kW
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rated mechanical power at 600 rpm
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22 kW
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overload mechanical power
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37.5 kW
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rated torque at 325 rpm
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646 Nm
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rated torque at 600 rpm
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358 Nm
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peak torque
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1100 Nm
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(short-period) overload duty cycle
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15 %
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stall torque (zero speed) at 55 A(DC current)
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501 Nm
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stall torque (zero speed) at 100 A(DC current)
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892 Nm
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constant torque region
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0 - 325 rpm
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flux weakening (constant power) region
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325 - 600 rpm
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flux weakening ratio
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1 : 1.85
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rated phase current up to 325 rpm
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55 Arms
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rated phase current at 600 rpm
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51 Arms
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rated efficiency
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92 %
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expected winding average temperature
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83 °C
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peak winding temperature
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160 °C
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cosj at 325 rpm, 22 kW
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0.925
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cosj at 600 rpm, 22 kW
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0.983
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phase back-emf at 325 rpm, magnet at 55°C
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152 Vrms
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phase resistance at 95°C
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0.26 W
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phase inductance at 55 Arms
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5.5 mH
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rated DC bus voltage
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420 V
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electrical frequency at 325 rpm
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65 Hz
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electrical frequency at 600 rpm
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120 Hz
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estimated short circuit to rated current ratio at 325 rpm
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130 %
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demagnetization resistance to transitory short circuit
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yes
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shaft position feed back
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2 poles resolver
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