Patent ID: 11942882
Assignee: STMICROELETRONICS (BEIJING) R&D CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of starting a permanent magnet synchronous motor (PMSM) with field oriented control (FOC), the method comprises:
opening a first control loop of the PMSM;
setting a first direction for a first current component of the PMSM, wherein the first current component is perpendicular to a second current component of the PMSM, wherein the first current component and the second current component are obtained by transforming phase currents supplied to windings of a stator of the PMSM using a Clarke transformation followed by a Park transformation, wherein the first control loop is configured to be driven by a first error signal, wherein the first error signal is a first difference between a first reference current value and the first current component of the PMSM, wherein setting the first direction for the first current component comprises:
setting a transformation angle of the Park transformation to a first angle; and
setting the first reference current value to a pre-determined current value by gradually increasing the first reference current value from zero to the pre-determined current value;

after setting the first direction, aligning a rotor of the PMSM to the first direction;
after aligning the rotor, setting a second direction for the first current component, wherein the second direction is rotated from the first direction by 90 degrees;
after setting the second direction, starting the rotor in an asynchronous driving mode while the first control loop of the PMSM remains open, wherein in the asynchronous driving mode, the transformation angle of the Park transformation is provided by a controller of the PMSM and is independent of an angle of the rotor, wherein a value of the transformation angle changes from a first pre-determined value to a second pre-determined value;
after starting the rotor, increasing a rotation speed of the rotor by operating the first control loop in a first closed-loop mode; and
after increasing the rotation speed of the rotor, controlling the rotation speed of the rotor by operating the first control loop in a second closed-loop mode different from the first closed-loop mode, wherein the first reference current value remains at the pre-determined current value in the asynchronous driving mode and in the first closed-loop mode.