A minimum loss control method for surface-mounted permanent magnet synchronous motors

Abstract

The invention discloses a method for controlling loss minimization of a surface-mounted permanent magnet synchronous motor. The method comprises the following steps: 1, calculating specified exciting currents, leading to loss minimization, of d and q axes of the motor according to a Lagrange multiplier method according to a specified revolving speed and a specified electromagnetic torque; 2, calculating the exciting currents of the d and q axes according to the electric angle of a motor rotor, an A phase voltage, a B phase voltage and the current; 3, calculating specified voltages of the d and q axes according to the electric angular speed of the motor rotor, the exciting currents of the d and q axes, and the specified exciting currents of the d and q axes; 4, converting the specified voltages of the d and q axes into specified voltages in a three-phase static coordinate by using equipower two-phase rotating to three-phase static conversion; 5, producing 6 paths of SVPWM signals according to the specific voltages in the three-phase static coordinate to drive to 6 bridge arms of an inverter used for driving the motor, so as to control the loss minimization of the surface-mounted permanent magnet synchronous motor. The minimization of the steady loss is realized while a vector control system of the surface-mounted permanent magnet synchronous motor guarantees the dynamic response speediness and the steady accuracy.

Description

technical field [0001] The invention belongs to the field of motor control, and in particular relates to a minimum loss control method of a surface-mounted permanent magnet synchronous motor. Background technique [0002] The surface-mounted permanent magnet synchronous motor has the characteristics of small size, low noise, high efficiency, high power density, small moment of inertia, wide speed range, large starting torque, strong overload capacity, and stable output torque. It is widely used in Industrial robots, CNC machine tools, electric vehicles, medical equipment, aircraft and other applications that require high precision, high dynamic performance, and a wide range of position, speed, and torque control. The surface-mounted permanent magnet synchronous motor is a multi-input multi-output, high-order, nonlinear, and strong-coupling system. In order to obtain high dynamic and static performance, it is often controlled by a vector control system. However, the classic ...

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Problems solved by technology

However, the classic vector control system does not consider the influence of motor iron loss and other factors, and uses a PID regulator, which has problems such as insufficient system response speed, insufficient motor efficiency, and difficult adjustment of regulator parameters, making it difficult to meet increasingly stringent application requirements.

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