Answered Essay: An electric wheelchair with a maximum speed of 5 mph is powered using a 12 V lead-acid battery. Propulsionis

An electric wheelchair with a maximum speed of 5 mph is powered using a 12 V lead-acid battery. Propulsionis provided using a 12 V permanent magnet dc motor whose speed is proportional to voltage and torque is proportional to current in both magnitude and direction. Develop a power converter topology, incorporating ideal switches to drive the motor from the battery to control the motor in forward and reverse directions while providing both driving and braking torques. Populate the ideal switch(es) with MOSFETs and diodes.

Expert Answer

Dear Student,

For driving the permanent magnet DC motor , we should have a 3- Phase inverter driving the motor from the battery supply.

You might get a doubt why can’t we use 1-phase inverter but remember with 1-phase supply motors are not self starting unless you use auxiliary winding because rotating magnetic field is not generated with 1-phase supply.

Hence we use 3- Phase inverter topology for driving the motor from battery.

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