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Engineered Excellence... Industrial Strength  

Products
  
 MBW Wheel Motor Family
 38HP External Rotor Motors for Electric Vehicles


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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Specifications

 

Traction Motor Type

Synchronous Permanent Magnet

configuration

cup-type external rotor, random wire inner stator

maximum external diameter

400 mm

maximum axial length

200 mm

base electric speed

325 rpm

base mechanical speed

325 rpm

maximum speed

600 rpm

rated mechanical power at 325 rpm

22 kW

rated mechanical power at 600 rpm

22 kW

overload mechanical power

37.5 kW

rated torque at 325 rpm

646 Nm

rated torque at 600 rpm

358 Nm

peak torque

1100 Nm

(short-period) overload duty cycle

15 %

stall torque (zero speed) at 55 A(DC current)

501 Nm

stall torque (zero speed) at 100 A(DC current)

892 Nm

constant torque region

0 - 325 rpm

flux weakening (constant power) region

325 - 600 rpm

flux weakening ratio

1 : 1.85

rated phase current up to 325 rpm

55 Arms

rated phase current at 600 rpm

51 Arms

rated efficiency

92 %

expected winding average temperature

83 °C

peak winding temperature

160 °C

cosj at 325 rpm, 22 kW

0.925

cosj at 600 rpm, 22 kW

0.983

phase back-emf at 325 rpm, magnet at 55°C

152 Vrms

phase resistance at 95°C

0.26 W

phase inductance at 55 Arms

5.5 mH

rated DC bus voltage

420 V

electrical frequency at 325 rpm

65 Hz

electrical frequency at 600 rpm

120 Hz

estimated short circuit to rated current ratio at 325 rpm

130 %

demagnetization resistance to transitory short circuit

yes

shaft position feed back

2 poles resolver


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