Abstract
Most electric vehicles use regenerative brakes, since this kind of braking system design recycles electromotive force to increase electric power endurance during braking. This research proposes a sensor-free, integrated driving and braking control system that uses a space-vector-pulse-width module to synthesize stator current by purpose. It calculates the rotor position angle of the motor by detecting variation in the stator current and completes a closed-loop control. When the motor receives a brake command, the controller changes the inverter-switching sequence to generate reverse torque and a magnetic field to complete the driving or braking function using field-oriented control (FOC). This provides a smoother and more accurate motor control than sinusoidal commands with Hall feedback. Compared to the regenerative brake and rheostatic brake, the proposed braking system has a powerful braking torque and shorter reaction time. Comparisons of reaction times for a modified four-wheel electric vehicle equipped with a permanent magnet synchronous motor under neutral-sliding-status, FOC based braking, and short-circuit braking were conducted.
Highlights
Most electric vehicles follow the design of regenerative braking, which converts lost energy back into the electric vehicle’s battery via the inverter
Stator coil from driving to braking—like we propose an idea by reversing the direction of the magnetic field force of the permanent magnet (PM)
If the motor is working below the knee-point in the BH-curve with the y-axis referred to the magnetic flux density and the x-axis referred to magnetic field strength [19], the permanent magnet will become demagnetized and cannot be recovered
Summary
Most electric vehicles follow the design of regenerative braking, which converts lost energy back into the electric vehicle’s battery via the inverter. This research proposes an integrated driving and braking system for electric vehicles that adopts is decreasing—which leads to relatively low braking torque. It causes poor braking performance when the vehicle speed is a senseless field-oriented control (FOC)driving method to achieve a compromise between. Plugsynchronous brake has been commonly adopted in heavy systems and can stopthe a permanent motor stator coil from driving to braking—like we propose an idea by reversing the direction of the magnetic field force of the permanent magnet (PM). A plugging brake drives the brake has been commonly adopted in heavy systems and can stop a controlled object quickly during is synthesized by changing the direction of the current on the power transistors. A plugging brake drives the electrical machine to the opposite same idea is applicable to the current design.
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