BMW i3 motor and electronic control analysis
[BMW i3 motor and electronic control analysis]
The foreign Oak Ridge Laboratory disassembled and analyzed the BMW i3 (2016 model) motor and electronic control. Let's learn together:
As shown in the figure below, the motor and the reducer are separated, and the motor does not share the housing with the reducer.
The maximum power of the motor is 125kW, the maximum torque is 250Nm, the total weight is 42kg, and the power density is close to 3kW/kg.
The outer surface of the inner casing of the motor is milled with a spiral groove, two O-rings are installed at both ends, and the outer casing of the motor is sleeved to form a water channel.
The outer casing is 6.9kg, the inner casing is 4.6kg, and the stator (iron core, copper wire, insulating material, etc.) is 20.8kg.
12 pole 72 slots.
9 inches per slot, 12 (AWG21) copper wires per turn.
Two temperature sensors, one mounted at the winding and the other mounted at the bearing.
The stator core is not a complete ring type, and is composed of six iron cores in a splicing manner.
The stator core length is 132.3 mm and the outer diameter is 242.1 mm.
The rotor weighs 14.2 kg.
The outer diameter of the rotor is 178.6 mm.
Each pole is equipped with one large and one small NdFeB magnet.
