Correction constant calculating system and method
A technology for calibrating constants and calculating systems, applied in control systems, electronic commutators, instruments, etc., can solve problems such as deviations in the gain of shunt resistance operational amplifiers, affecting speed control, differences, etc., and achieve easy calibration of constants. Effect
Active Publication Date: 2011-03-30
DAIKIN IND LTD
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[0005] However, since the value of the shunt resistor constituting the current detection unit and the gain of the operational amplifier vary, there may be a gap between the motor current detected by the current detection unit (that is, the detection result of the current detection unit) and the actual motor current. make a difference
In this case, the difference may affect the motor speed control performed using the detection result of the current detection part, that is, the motor current.
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[0111] (a)
[0112] In the above-described embodiments, the case where the current detection device 2 is connected to the motor device 94 including the motor 91 and the motor driver 92 has been described. However, the use of the current detection device of the present invention is not limited thereto. For example, as shown in Fig. 5, it is also applicable to the case where the current detection device 2' is connected to a motor 91' and a motor driver 92' which are provided separately.
[0113] In this case, usually, the GND wiring of the motor 91' and the GND wiring of the motor driver 92' are provided separately in many cases (L3a, L3b in FIG. 5 ). Here, the GND connection of the current detection device 2' may be divided into the GND connection 23a for the motor 91' and the GND connection 23b for the motor driver 92' in advance. Then, when connecting the motor 91' and the current detection device 2', and performing air volume control etc. using the motor current Im with ex...
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The invention provides a meter constant computing system and a computing method for meter constant which can compute the meter constant used for correcting the testing result of the correcting current testing part. The meter constant computing system is provided with a current testing device, a constant current source and a meter constant computing device. The current testing device can be connected with a motor, and is provided with a GND connection, a current testing part and a storage part. The electrifying current including the motor current Im circulates in the GND connection. The current testing part tests the electrifying current in the GND connection. The storage part can store the meter constant Ht which is used for correcting the detection result of the electrifying current. Theconstant current source makes at least two constant current flows on the GND connection at the state of un-connection of the testing device and the motor. The computing part computes the Ht dependingon at least two detection results of the constant current and writes in the storage part.
Description
technical field [0001] The invention relates to a correction constant calculation system and a correction constant calculation method. Background technique [0002] An air conditioner has various devices such as a compressor and a fan. Electric motors are often used as the power source for these devices. The motor is connected to a motor drive unit (hereinafter referred to as a motor driver) composed of a plurality of switching elements, and the motor can be rotated by a driving voltage output by switching each switching element in the motor driver. [0003] In addition, the rotation speed of the motor is sometimes controlled in order to operate various devices such as a compressor and a fan in an appropriate state. The motor current supplied to the motor is usually used for rotational speed control of such a motor. Here, as a detection method of the motor current, for example, the technology disclosed in Patent Document 1 is known, that is, a shunt resistor connected in ...
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IPC IPC(8): H02P6/00H02P6/14H02P29/00G01R19/00
Inventor 池田基伸八木达嶋谷圭介前田浩仁桥本雅文
Owner DAIKIN IND LTD