CONTROL DEVICE

• US 20090021194A1
• Filed: 03/28/2006
• Published: 01/22/2009
• Est. Priority Date: 03/31/2005
• Status: Active Grant

• Current Assignee: Toshiba Elevator Kabushiki Kaisha
• Original Assignee: Toshiba Elevator Kabushiki Kaisha
• Inventors: Morishita, Mimpei, Tonami, Yosuke
• Granted Patent: US 7,671,552 B2
• Time in Patent Office: Days
• US Class Current: 318/400.20
• CPC Class Codes: B66B 1/308 with AC powered elevator drive
• CPC Class Codes: H02P 21/22 Current control, e.g. using a current control loop
• CPC Class Codes: H02P 25/06 Linear motors

Abstract

Parameters “n”, “ad”, “pd”, “aq”, “pq” and the like of a motor parameter setting unit 4 are set so as to satisfy [Expression 23] and the like, a d-axis current command value “Idco” outputted from a d-axis current instructing unit 2 and a q-axis current command value “Iqco” outputted from q-axis current instructing unit 3 are corrected based on these parameters “n”, “ad”, “pd”, “aq” and “pq”, on a detection result of rotation angle detecting unit 11, and on the like, and a (6×n)f sine component, (6×n)f cosine component, (6×(n+1))f sine component and (6×(n+1))f cosine component of torque “T” shown in [Expression 22] are made zero. In such a way, 6×n and 6×(n+1) ripple components and the like, which are generated in a motor provided in elevator equipment or the like, are suppressed, and a torque ripple of the motor is reduced to a large extent.

Claims

1. A control device, comprising:

a d-axis/q-axis current instructing unit for creating a d-axis current command and a q-axis current command in response to a deviation between an actually measured speed and preset rotation speed of a motor;

a rotation angle detecting unit for detecting a rotation of the motor and outputting an electrical angle;

a motor parameter setting unit in which parameters corresponding to characteristics of the motor are set;

a current command value correcting unit for performing a correction necessary to suppress a harmonic ripple component of torque generated by the motor for the d-axis current command and the q-axis current command, which are outputted from the d-axis/q-axis current instructing unit, in response to the electrical angle outputted from the rotation angle detecting unit and to the parameters outputted from the motor parameter setting unit, and creating already corrected d-axis current command value and q-axis current command value; and

a 3-phase driving unit for creating drive voltages of three phases and supplying the drive voltages to the motor based on the already corrected d-axis current command value and q-axis current command value, which are outputted from the current command value correcting unit, and on an output current detection signal of the motor, which is outputted from the current detecting unit.

2. The control device according to claim 1, further comprising:

a ripple detecting unit for detecting vibrations or noise of the motor; and

a correction parameter learning unit for obtaining a parameter necessary to minimize the vibrations or noise of the motor based on a detection result of the ripple detecting unit and on the already corrected d-axis current command value and q-axis current command value, which are created by the current command value correcting unit, and performing either processing for correcting the parameters for use in the current command value correcting unit or processing for notifying the obtained parameter from a notification device.

3. The control device according to claim 1, further comprising:

a ripple assuming unit for assuming a ripple of the motor based on the current command values created by the 3-phase driving unit, on the output current detection signal of the motor, which is outputted from the current detecting unit, and on a rotation angle outputted from the rotation angle detecting unit; and

a correction parameter learning unit for obtaining a parameter necessary to minimize the vibrations or noise of the motor based on the already corrected d-axis current command value and q-axis current command value, which are created by the current command value correcting unit and on an assumption result of the ripple detecting unit, and performing either processing for correcting the parameters for use in the current command value correcting unit or processing for notifying the obtained parameter from a notification device.

4. The control device according to claim 1, further comprising:

a temperature detecting unit for detecting a temperature of the motor; and

a correction parameters changing unit for obtaining a parameter necessary to minimize the vibrations or noise of the motor based on the temperature of the motor, which is detected by the temperature detecting unit, and on the already corrected d-axis current command value and q-axis current command value, which are created by the current command value correcting unit, and performing either processing for changing the parameters for use in the current command value correcting unit or processing for notifying the obtained parameter from a notification device.

5. The control device according to claim 1, further comprising:

an operation condition setting unit in which operation conditions are set; and

a correction parameter switching unit for switching the parameters of the current command correcting unit in response to the operation conditions set in the operation condition setting unit.

6. A control device, comprising:

a d-axis/q-axis current instructing unit for creating a d-axis current command and a q-axis current command in response to a deviation between an actually measured speed and preset rotation speed of a linear motor;

an electrical angle detecting unit for detecting the speed of the linear motor and outputting an electrical angle;

a motor parameter setting unit in which parameters corresponding to characteristics of the linear motor are set;

a current command value correcting unit for performing a correction necessary to suppress a harmonic ripple component in a Z-direction, which is generated by the linear motor, for the d-axis current command and the q-axis current command, which are outputted from the d-axis/q-axis current instructing unit, in response to the electrical angle outputted from the electrical angle detecting unit and to the parameters outputted from the motor parameter setting unit, and creating already corrected d-axis current command value and q-axis current command value;

a 3-phase driving unit for creating drive voltages of three phases and supplying the drive voltages to the linear motor based on the already corrected d-axis current command value and q-axis current command value, which are outputted from the current command value correcting unit, and on an output current detection signal of the linear motor, which is outputted from current detecting unit;

a ripple detecting unit for detecting vibrations or noise of the linear motor; and

a correction parameter learning unit for obtaining a parameter necessary to minimize the vibrations or noise of the linear motor based on an output of the ripple detecting unit and on the already corrected d-axis current command value and q-axis current command value, which are created by the current command value correcting unit, and performing either processing for correcting the parameters for use in the current command value correcting unit or processing for notifying the obtained parameter from a notification device.