Synchronous motor driving method, compressor driving method, device for the methods, and brushless DC motor driving device
OwnerHiroyuki Yamai, Nobuki Kitano +2inventors
InventorsHiroyuki Yamai, Nobuki Kitano, Yoshihito Sanga, Manabu Kosaka
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Abstract
When torque control is performed for suppressing speed change within one rotation using a synchronous motor (6) controlled by an inverter (5) for a load having cyclic torque changing, an arrangement is employed which includes inverter control means (8) (10) for controlling the inverter (5) so as to superpose a changing amount upon an amplitude and phase of a current waveform or voltage waveform, so that torque control is realized for reducing low speed vibration of a cyclic intermittent load with maximum efficiency condition and with practical arrangement.
Claims24
A synchronous motor driving method comprising the step of;
- superposing a varying amount upon an amplitude and a phase of a current waveform or voltage waveform when torque control is performed for suppressing speed change within one rotation by a synchronous motor controlled with an inverter which motor drives a load having a cyclic torque change.
A synchronous motor driving device comprising;
- inverter control means for controlling an inverter so as to superpose a varying amount upon an amplitude and a phase of a current waveform or voltage waveform when torque control is performed for suppressing speed change within one rotation by a synchronous motor controlled with an inverter which motor drives a load having a cyclic torque change.
A brushless DC motor driving, device comprising;
- resistances, each having one end which is connected to an output terminal of each phase of an inverter and another end which is connected to one another so that a first center point voltage is obtained,
- stator windings each corresponds to each phase of a brushless DC motor, each of which stator windings is connected at one end to one another so that a second center point voltage is obtained,
- integration means for integrating a difference between the first center point voltage and the second center point voltage and for obtaining an integration signal,
- magnetic pole position detection means for detecting a magnetic pole position of a rotor of the brushless DC motor based upon the integration signal,
- inverter control means for controlling the inverter so that a changing voltage which is advanced with respect to a phase of a load torque is superposed upon an average value voltage command in synchronism with intermittence of the load torque for applying to the brushless DC motor;
- and
- peak-value change suppression means for suppressing change in peak value of the integration signal.
A brushless DC motor driving device comprising;
- resistances each having one end which is connected to an output terminal of each phase of an inverter and another end which is connected to one another so that a first center point voltage is obtained,
- stator windings each corresponding to each phase of a brushless DC motor each of which stator windings is connected at one end to one another so that a second center point voltage is obtained,
- integration means for integrating a difference between the first center point voltage and the second center point voltage and for obtaining an integration signal,
- magnetic pole position detection means for detecting a magnetic pole position of a rotor of the brushless DC motor based upon the integration signal,
- inverter control means for controlling the inverter so that a changing phase which is advanced with respect to a phase of a load torque is superposed upon an average value phase command in synchronism with intermittence of the load torque for applying to the brushless DC motor, and
- peak value change suppression means for suppressing change in peak value of the integration signal.
Dependencies are inferred from the claim text.