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A method for sensorless position estimation in PM synchronous motors is proposed. The high frequency zero sequence voltage generated by the PWM is used as carrier source. It is applied to the motor by closing the neutral point to the DC-link through a filter. The anisotropy information, and consequently the position of the rotor, is evaluated from the resulting non-zero sequence current. When compared...
An integral battery charger is proposed for an electric scooter with Li-Ion batteries and Interior-permanent-magnet (IPM) traction motor. The battery charger is integrated in the power hardware of the scooter, with the IPM traction drive that operates as three-phase dc-dc converter with power factor correction (PFC) capability. The control of the PFC battery charger is also integrated into the traction...
In this paper, we propose an injection axis switching (IAS) sensorless control scheme using a pulsating high-frequency (HF) signal to minimize the position detection error and the velocity estimation ripple due to the zero current clamping (ZCC) effect for permanent magnet synchronous motors (PMSMs). When a pulsating carrier-signal voltage is injected in an estimated synchronous frame, the envelope...
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