Method of detecting motor current and motor control device
A current detection and control device technology, which is applied in the direction of motor generator control, AC motor control, electronic commutation motor control, etc., can solve the problems of high price and limited use of Hall CT
Inactive Publication Date: 2007-10-10
TOSHIBA CARRIER CORP
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Problems solved by technology
Among them, the price of Hall CT is very high, and its use is limited
Method used
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[0018] The present invention will be described in detail below according to the preferred embodiments shown in the accompanying drawings. 1 is a structural block diagram of a current detection method of the present invention and a motor control device using the method. In the figure, the same components as those in FIG.
[0019] In this embodiment, the current detection resistor 4 for detecting overcurrent is commonly used as a phase current detection element, and the current detector 9a detects the current supplied to the three phases of the motor 7 based on the voltage generated at both ends thereof. In order to realize such current detection, a waveform changer 13 for changing the basic energization pattern used for pulse width modulation (PWM) is provided between the waveform generator 11 and the drive circuit 12, and the structure of the current detector 9a is designed to be able to The current of each phase is determined according to the output signal waveform of the wav...
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In a current detection system for detecting phase currents of an electric motor driven through a power converter adapted for carrying out ON / OFF control of bridge-connected plural switching elements in accordance with a predetermined excitation pattern to convert direct current into, e.g., three phase alternating currents, there are provided a current detecting element connected to the direct current side of the power converter and serving to provide a signal corresponding to current value, a waveform changer for changing the predetermined excitation pattern so that a signal directly or indirectly corresponding to the phase currents is produced at the current detecting element, and a current detector for detecting phase currents of the electric motor on the basis of the signal produced at the current detecting element and the changed excitation pattern. As a result, detections of phase currents of the electric motor can be carried out by using single current detecting element. Thus, vector control of the electric motor using such current detection system can be realized.
Description
technical field [0001] The present invention relates to vector control of motors, in particular to a current detection method of a motor using a single current detection element to detect phase currents and a control device for the motor using the method. Background technique [0002] In the case of vector control of the motor, it is required to obtain a voltage waveform with a small phase delay relative to the current waveform while converting the AC current into AC voltage. As a device for converting an alternating current into an alternating voltage, there are generally a measuring instrument current transformer called a CT (current transformer), a Hall CT using a Hall effect, and the like. Among them, the price of Hall CT is very high, and its use is limited. Therefore, the following description will focus on a current detection method and a control device for a motor using a measuring instrument current transformer. [0003] FIG. 7 is a block diagram showing the confi...
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IPC IPC(8): H02P6/18G01R19/00H02P6/06H02P6/08H02P6/182H02P21/00H02P21/14H02P21/18H02P21/22H02P21/24H02P23/14H02P25/022H02P25/026H02P27/04H02P27/08
CPCH02P6/002H02P6/28H02P6/18H02P27/06
Inventor 温品治信
Owner TOSHIBA CARRIER CORP