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Synchronous Motor Control System

A synchronous motor and control system technology, applied in motor generator control, AC motor control, control system and other directions, can solve the problems of submerging position information in noise, reducing the detection sensitivity of induced voltage, and reducing the cost of setting position sensors, etc. High-performance control characteristics, the effect of realizing control characteristics

Active Publication Date: 2016-10-05
HITACHI IND EQUIP SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, although sensorless control has great effects such as being able to reduce the cost of installing a position sensor, miniaturizing the device due to the absence of a sensor, and enabling use in harsh environments, such sensorless control There is a big problem in the position detection method when running at low speed
[0007] Specifically, since most of the sensorless control in practical use today is based on the induced voltage (speed electromotive force) generated by the synchronous motor, there is detection of the induced voltage near zero speed (substantial stop state) where the induced voltage is small, or in the low-speed region The problem of reduced sensitivity and position information being submerged in noise

Method used

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Experimental program
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Effect test

Embodiment 1

[0040] figure 1 It is a block diagram showing the configuration of the drive system of the synchronous motor according to the first embodiment of the present invention. Such as figure 1 As shown, the synchronous motor drive system of the first embodiment includes: a synchronous motor 4 to be controlled; and a controller that outputs a voltage command to the power converter 2 to control the synchronous motor 4 and is composed of a plurality of functional components.

[0041] This controller is configured to include means for applying a pulse voltage by selecting two energized phases from the three-phase windings of the synchronous motor 4 based on the electromotive force of the non-energized phase (that is, the open circuit phase, hereinafter referred to as the non-energized phase) at the time of pulse application. A unit for estimating the phase (magnetic pole position of the rotor) and speed (mode switching trigger 8, speed converter 20), and a unit for estimating phase and...

Embodiment 2

[0117] Figure 9 is a block diagram showing the configuration of a phase and speed estimation unit which is a main part of another embodiment of the synchronous motor control system of the present invention, and figure 1 The same objects are attached with the same symbol.

[0118]In the 120-degree energization, since a period in which energization phases overlap occurs immediately after the energization mode is switched, there is a possibility that an error may be included in the phase estimation result during this period. Therefore, phase estimation immediately after switching the energization mode can be prohibited for a predetermined period immediately after switching the energization mode, for example, for a predetermined time.

[0119] exist Figure 9 Here, the output of the axis error estimation calculation unit 17 is transmitted to the adder 23 d , and the mask setting unit 25 is provided between the adder 23 d and the speed estimation unit 18 . The mask setting unit...

Embodiment 3

[0125] Figure 10 A block diagram showing the configuration of a phase and speed estimation unit which is a main part of another embodiment of the synchronous motor control system of the present invention, and figure 1 The same objects are attached with the same symbol.

[0126] As described in Embodiment 2, since a period in which energization phases overlap occurs immediately after the energization mode is switched in 120-degree energization, there is a possibility that an error may be included in the phase estimation result during this period. Therefore, it is important to suppress this error.

[0127] Therefore, similarly to Embodiment 2, using the point where the voltage phase in 120-degree energization is updated every 60 degrees, a speed estimation part (normal) 18a that outputs a normal continuous estimated speed signal to the speed estimation part 18 is provided; every 60 degrees A speed estimation part (every 60 degrees) 18b that outputs an estimated speed signal i...

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PUM

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Abstract

When switching a synchronous motor from a 120-degree energization method to a 180-degree energization method, there has been a problem that a current phase in the 120-degree energization method advances and a power factor deteriorates at around a velocity smaller than a switching velocity. The present invention provides a control system for a synchronous motor which can perform a seamless drive with reduced torque shock in a broad velocity range from a zero velocity to a middle and high velocity region. In the control system which activates a synchronous motor by a 120-degree energization method and subsequently switches to a 180-degree energization method to drive the synchronous motor, a power factor improvement means for improving a power factor in the 120-degree energization is provided, and the synchronous motor is driven by the 180-degree energization method after switching from the 120-degree energization method with the improved power factor.

Description

technical field [0001] The present invention relates to a drive system of a synchronous motor, in particular to a synchronous motor control system suitable for controlling the rotation speed and torque of a synchronous motor by estimating the magnetic pole position of a rotor without using a position sensor. Background technique [0002] In technical fields such as home appliances, industrial machinery, and automobiles, motor drives are used for rotational speed control, torque assist control, and positioning control of fans, pumps, compressors, conveyor belts, elevators, and the like. [0003] Small and highly efficient synchronous motors using permanent magnets are widely used in motor drive devices in these technical fields. Furthermore, in order to drive a synchronous motor, information on the magnetic pole position of the motor rotor is required, so a position sensor such as a resolver or a Hall IC that detects the magnetic pole position is required. [0004] On the ot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/18H02P6/182H02P21/18H02P23/00H02P6/06H02P6/08H02P6/28H02P21/00H02P21/14H02P21/22H02P21/24H02P21/28H02P23/14H02P27/04H02P27/08
CPCH02P6/18H02P6/181H02P6/182H02P6/187H02P21/18H02P23/0027
Inventor 高畑良一岩路善尚青柳滋久户张和明
Owner HITACHI IND EQUIP SYST CO LTD