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Motor control device, motor control system, motor control module and refrigerating unit

A motor control and control system technology, applied in the fields of motor control modules and refrigeration devices, motor control systems, and motor control devices, can solve the problem of complicated devices, inability to adjust the error between the motor rotor shaft and the control shaft, and the undocumented load torque estimation method and other problems to achieve the effect of reducing the impact of switching

Active Publication Date: 2012-05-23
HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the technology of Patent Document 1, in order to determine the voltage in the synchronous operation mode, the change of the load torque is estimated from the change of the current flowing through the motor, but the method of estimating the load torque before and after switching is not described.
In addition, in order to detect the induced voltage phase of the motor, an additional circuit and a special energization pattern of the inverter are required, and the device becomes complicated
[0009] In the technology of Patent Document 2, the load torque before switching can be estimated, and the current command after switching can be set corresponding to the load torque. However, since the axis error between the motor rotor axis and the control axis cannot be adjusted, the while legacy switching axis error

Method used

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  • Motor control device, motor control system, motor control module and refrigerating unit
  • Motor control device, motor control system, motor control module and refrigerating unit
  • Motor control device, motor control system, motor control module and refrigerating unit

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no. 1 approach

[0031] figure 1 It is a block diagram of the motor control system of 1st - 3rd embodiment of this invention.

[0032] The motor control system 100 includes: a permanent magnet synchronous motor 1; a DC power supply 2; an inverter 3 for converting DC power into AC power; a DC voltage detector 4 for detecting the voltage of the DC power supply 2; A DC current detector 5 for detecting the current on the DC side; and a control device 6 .

[0033] Motor 1 is a permanent magnet synchronous motor.

[0034] The DC power supply 2 is a converter (rectifier) ​​or a battery that converts AC power supplied from a commercial power supply into DC power, and supplies power to the DC side of the inverter 3 .

[0035] The inverter 3 includes: six IGBTs (Insulated Gate Bipolar Transistor, insulated gate bipolar transistors); and commutation diodes connected to the collectors and emitters of the respective IGBTs.

[0036] In addition, the control device 6 processes the detection signals of the...

no. 2 approach

[0087] Figure 12 It is a detailed functional block configuration diagram of the voltage command controller 12 (12b) which is the motor control device according to the second embodiment of the present invention. and Figure 4 The difference is that the voltage command value calculation is changed to the sum of the output of the vector calculator 42 and the outputs of the current controllers 39 and 40 as shown in the formula (6). Current reproduction calculation and phase estimation processing are the same as those in the first embodiment.

[0088] V dc * = r * I dc * - ω 1 * ...

no. 3 approach

[0092] The constituent elements of the motor control device according to the third embodiment of the present invention and figure 1 The parts shown are the same, but the vector control method inside the control device 6 is different.

[0093] (Overall Composition of Control)

[0094] Figure 13 It is a functional block configuration diagram of the inside of the control device 6 (6b) which is the third embodiment of the present invention. Additionally, with figure 2 Parts with the same number perform the same actions.

[0095] and figure 2 The difference is that the qc-axis current command value Iqc in the position sensorless mode is calculated from the low-pass filter 52 ＊ ; and the PLL controller 7 ( figure 2 ) is changed to a speed error calculator 50 for calculating a speed error and an adder 51 for performing a sum calculation of the speed error and a speed command.

[0096] That is, the speed error calculator 50 calculates the speed error Δωm by proportionally c...

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Abstract

The invention provides a motor control device, a motor control system, a motor control module and a refrigerating unit, capable of reducing switching shock when switching from synchrony operation mode to non-position sensor mode. In a control device 6a comprising a dc vector control device for controlling rotating speed of permanent magnet synchronous motor consistent with speed instruction valueomega i through an inverter, comprising a synchrony operation mode for driving the permanent magnet synchronous motor together with a rotating angle theta m' obtained by integraling the speed instruction value; and a non-position sensor mode for proceeding feedback control to rotating angle theta m of the permanent synchronous motor, comprising a switcher 19 that speculating shaft error (delta theta c) of the stator shaft of the permanent magnet synchronous motor and control system shaft of the dq vector control part, and when the speculated shaft error almost consistent with phase differenceof current instruction value, the synchronous rotating mode is switched into the non-position sensor mode.

Description

technical field [0001] The invention relates to a motor control device, a motor control system, a motor control module and a refrigeration device. Background technique [0002] In a position sensorless drive device of a permanent magnet synchronous motor (hereinafter referred to as "motor"), a method is known in which the output of the inverter is gradually increased while a current of a predetermined amplitude is passed through the motor at the beginning of starting. Frequency, to accelerate the motor to a specified speed (called synchronous operation mode), and then estimate the axis error between the motor rotor axis and the control system axis based on the voltage and current information applied to the motor, and switch to control the estimated axis error to a specified value mode (called sensorless mode of operation). [0003] In this method, when the operation mode is switched at a predetermined rotational speed, the rotor shaft of the motor in the synchronous operati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P21/14H02P6/18H02P6/06H02P6/08H02P6/182H02P6/21
Inventor 李东升能登原保夫岩路善尚栗田佳明
Owner HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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