Pump driving method and device therefor

• US 20060153689A1
• Filed: 11/17/2003
• Published: 07/13/2006
• Est. Priority Date: 11/15/2002
• Status: Active Grant

• Current Assignee: Daikin Industries Ltd
• Original Assignee: Daikin Industries Ltd
• Inventors: Ochi, Yoshiyuki, Yanagida, Yasuto, Nakata, Tetsuo
• Granted Patent: US 7,588,422 B2
• Time in Patent Office: Days
• US Class Current: 417/44.200
• CPC Class Codes: F04B 49/065 and making use of computers
• CPC Class Codes: F04D 15/0066 by changing the speed, e.g. of the driving engine

Abstract

A pump driving apparatus has a characteristic changing section which receives a set pressure, a set flowing amount, a set horse power, and a DC voltage of the converter section as input, outputs modified values of pressure, flowing amount, and horse power, and supplies the modified values to the horse power command generation section. Therefore, the motor can be driven to suit the change in power voltage so that the motor capacity can be utilized sufficiently.

Claims

1. A pump driving method comprising:

driving a motor based upon a command value using a discharge pressure—

discharge flow characteristic;

carrying out feedback control of a discharge pressure, and

driving a pump using the motor to change the discharge pressure—

discharge flow characteristic in correspondence with a power voltage.

2. A pump driving method as set forth in claim 1, further comprising

holding, the discharge pressure—

discharge flow characteristics corresponding to a plurality of power voltage, respectively, and

selecting a corresponding one of the discharge pressure—

discharge flow characteristics in correspondence with a detection value of the power voltage.

3. A pump driving method as set forth in claim 1, further comprising

defining a predetermined pressure, flowing amount, and horse power as characteristic values for a predetermined power voltage, and

changing the discharge pressure—

discharge flow characteristic in correspondence with a detection value of the power voltage.

4. A pump driving method comprising:

driving a motor based upon a command value using discharge pressure—

discharge flow characteristic,

carrying out feedback control of a discharge pressure,

driving a pump using the motor based on whether or not a DC voltage of an inverter for supplying a driving voltage to the motor is an ideal DC voltage value of an alternate current power voltage,

changing the discharge pressure—

discharge flow characteristic for the DC voltage upon judging that the DC voltage is the ideal DC voltage value of the alternate current power voltage, and

maintaining a changed discharge pressure—

discharge flow characteristic upon judging that the DC voltage is not the ideal DC voltage value of the alternate current power voltage and when just previously judged the DC voltage was the ideal DC voltage value of the alternate current power voltage.

5. The pump driving method as set forth in claim 4, wherein

the maintaining of the changed discharge pressure—

discharge flow characteristic is accomplished by maintaining a power voltage value instead the maintaining of the discharge pressure—

discharge flow characteristic.

6. A pump driving apparatus comprising:

a motor configured to be driven based upon a command value using a discharge pressure—

discharge flow characteristic to feedback control a discharge pressure,

a pump operatively coupled to the motor, and

a characteristic changing section configured to change the discharge pressure—

discharge flow characteristic in correspondence with a power voltage.

7. The pump driving apparatus as set forth in claim 6, wherein

the characteristic changing section is configured to hold the discharge pressure—

discharge flow characteristics corresponding to a plurality of power voltage, respectively, and to select a corresponding one of the discharge pressure—

discharge flow characteristics in correspondence with a detection value of the power voltage.

8. The pump driving apparatus as set forth in claim 6, wherein

the characteristic changing section is configured to define a predetermined pressure, flowing amount, and horse power as characteristic values for a predetermined power voltage, and to change the discharge pressure—

discharge flow characteristic in correspondence with a detection value of the power voltage.

9. A pump driving apparatus comprising:

a motor configured to be driven based upon a command value using a discharge pressure—

discharge flow characteristic to feedback control a discharge pressure,

a pump operatively coupled to the motor, and

judgment means for judging whether or not a DC voltage of an inverter for supplying a driving voltage to a motor is an ideal DC voltage value of an alternate current power voltage, for changing a discharge pressure—

discharge flow characteristic for the DC voltage when it is judged that the DC voltage is the ideal DC voltage value of the alternate current power voltage, and for maintaining the changed discharge pressure—

discharge flow characteristic upon judging that the DC voltage is not the ideal DC voltage value of the alternate current power voltage and when the just previously judged the DC voltage was the ideal DC voltage value of the alternate current power voltage.

10. The A pump driving apparatus as set forth in claim 9, wherein

the judgment means maintains a power voltage value instead the maintaining of the discharge pressure—

discharge flow characteristic.