The invention provides a permanent magnet synchronous compressor rotating speed pulsation suppression method and device. The method comprises the steps: obtaining the current rotating speed of a compressor, determining the frequency of applying a feedforward compensation current according to the current rotating speed, and determining the phase of the moment when the feedforward compensation current is applied as a reference zero phase; determining a phase relationship between the reference zero phase and an optimal compensation phase of the feedforward compensation current; selecting two initial phases for binary iteration according to the phase relationship; binary iterative search is carried out according to the two initial phases, and the optimal compensation phase is determined; and determining the optimal compensation phase as the phase of the feedforward compensation current to carry out feedforward compensation so as to suppress the rotating speed pulsation. By applying the feedforward compensation sine wave current, the periodically changing compressor load torque is compensated, and the rotating speed pulsation of the compressor can be effectively inhibited. And the optimal compensation phase of the feed-forward compensation current can be quickly searched through a dichotomy, so that the convergence speed is increased.

Permanent magnet synchronous compressor rotating speed pulsation suppression method and device

The invention discloses a method for determining a q-axis current compensation value of a permanent magnet synchronous motor and a pulsation suppression method The method comprises the following steps: synchronously acquiring a q-axis current feedback signal iq and a rotor position signal theta m, determining a position interval of a rotor based on the theta m, accumulating the interval times by1 and performing synchronous averaging on the iq, and repeatedly acquiring until the accumulated value of the interval times is greater than a threshold value and all the intervals are not overlappedto form a circle of the rotor; performing fast Fourier transform on the synchronous average value corresponding to each interval arranged in sequence to obtain frequency domain characteristic information, determining the amplitude and the phase angle of a to-be-compensated spatial frequency component from the frequency characteristic information, and constructing a q-axis current compensation function; and obtaining a q-axis current compensation value based on the position of the actual compensation moment of the motor rotor and the current compensation function Time domain information is converted into a space domain, time lag is avoided, the whole process does not affect the dynamic performance of the system, extra devices are not needed, structures and parameters of all control links do not need to be adjusted, and operation is easy

Method for determining q-axis current compensation value of permanent magnet synchronous motor and pulsation suppression metho

The invention discloses a linear motion system health monitoring method based on spatial domain information, and belongs to the field of electromechanical system health state monitoring The method comprises the steps: measuring a spatial position signal of a linear motion system, and an electric signal for dragging an AC motor of the linear motion system; converting the electric signal based on the time domain into a space domain; calculating a local characteristic index of the local travel interval and a global characteristic index of the whole motion travel; judging whether the local feature indexes and the global feature indexes exceed corresponding set thresholds or not; if any index exceeds a set threshold value, determining that the linear motion system is in an abnormal state at the corresponding spatial position; and if not, determining that the motion travels of the linear motion system are all in a healthy state According to the method, the measurement information based onthe time domain is converted into the space domain, the health state of the linear motion system on the whole motion stroke can be comprehensively and accurately reflected, the position where the abnormal state occurs is indicated, and the method has great application value for linear motion system full-stroke monitoring

Linear motion system health monitoring method based on spatial domain information

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Method for determining q-axis current compensation value of permanent magnet synchronous motor and pulsation suppression metho

Linear motion system health monitoring method based on spatial domain information