Controlling device of permanent-magnet synchro motor

A permanent magnet synchronous and control device technology, applied in the starting device, single motor speed/torque control, current controller, etc., can solve the problems of insufficient torque, time-consuming, large electric phase angle correction, etc. , to achieve the effect of rapid and smooth start

Active Publication Date: 2006-06-28
MITSUBISHI ELECTRIC SHANGHAI ELECTRIC ELEVATOR
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is easy to generate torque in the opposite direction to the command, or the torque is not enough, etc.
In this case, since the elevator cannot be operated normally, there is a problem that it is not suitable to apply the conventional method of performing excitation correction while running.
[0008] However, considering the manufacturing cost, it is not practical to install an absolute position detector to ensure an electrical angle accuracy of several orders of magnitude
Therefore, in the case of using an absolute position detector in a multi-pole permanent magnet synchronous motor, the correction of the electrical phase angle is a big problem
Also, there is the problem that absolute position detectors are prohibitively expensive compared to enhanced encoders typically used in induction motors
[0009] In addition, in the magnetic pole position estimation method of Patent Document 1, since the axis discrimination and pole discrimination must be performed when setting the initial value, and the convergence calculation is also performed, it may take time to estimate the magnetic pole position, and it may take time before the actual start. Spend time

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  • Controlling device of permanent-magnet synchro motor
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  • Controlling device of permanent-magnet synchro motor

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Embodiment approach 1

[0024] figure 1 It is a configuration diagram of a control device for a permanent magnet synchronous motor according to Embodiment 1 of the present invention. The control device of this permanent magnet synchronous motor is constituted to include a d-q axis non-interference control system 101 (equivalent to figure 1 The part shown by the dotted line) of the speed control system 100 (equivalent to figure 1 The part shown by the single dot-dash line), and a detection mode setting unit 18, a magnetic pole detection current command unit 19, a magnetic pole phase determination unit 20, and switches 21a to 21c are further added.

[0025] First, the configuration of the speed control system 100 will be described. The d-q axis non-interference control system is conventional, and is used to control the current of the permanent magnet synchronous motor 1, and is a general control method that also includes speed control. The speed control system 100 is composed of a position detector ...

Embodiment approach 2

[0073] In Embodiment 1, the case where the d-axis current command value Idph is increased has been described as a method for easily generating the hunting phenomenon. In Embodiment 2, another method that is likely to cause a hunting phenomenon will be described.

[0074] Such as Figure 4 As shown in the Bode diagram of , the oscillation phenomenon can also be easily generated by delaying the phase in the high-frequency region. Thus, in Figure 5 In the processing of step S512, a delay element (redundant time element) may be inserted into the current control loop instead of increasing the d-axis current command value Idph.

[0075] Figure 7 It is a block diagram showing a d-axis current control system including a delay element 23 and a switch 24 according to Embodiment 2 of the present invention. The delay element 23 outputs the feedback current value Id' having a time delay with respect to the feedback current value Id of the current control system. In addition, the swi...

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Abstract

The invention provides a controller of a permanent magnet synchronous motor in which smooth start can be realized in a short time without using an absolute position detector. The controller comprises a detection mode setting means (18) outputting a magnetic pole detection command for detecting the magnetic pole position of a permanent magnet synchronous motor; a magnetic pole detection current command means (19) outputting a plurality of different values as electric phase angle and current commands for detecting initial magnetic pole phase in response to the magnetic pole detection command; signal switch sections (21a-21c) outputting the electric phase angle and current commands for detecting initial magnetic pole phase being delivered from the magnetic pole detection current command means to a current control section when the magnetic pole detection command is inputted; and a magnetic pole phase judging means (20) for detecting oscillation phenomenon by extracting a high frequency component from a feedback current for a plurality of different values outputted from the magnetic pole detection current command means (19) in response to the magnetic pole detection command, and specifying an electric phase angle for maximizing oscillation as the initial magnetic pole phase.

Description

technical field [0001] The present invention relates to a control device for a permanent magnet synchronous motor that detects the magnetic pole position of the synchronous motor. Background technique [0002] Patent Document 1: Japanese Unexamined Patent Publication No. 2003-143894 (page 1, figure 1 ) [0003] An elevator traction machine using a permanent magnet synchronous motor generally has a sensor for detecting the rotor magnetic pole position of the motor, and this function is often embedded in a speed detector directly connected to the rotating shaft of the motor. The detection accuracy of the rotor pole position determines the control performance of the motor torque. If the electrical angle deviates by 60 degrees, the torque will be halved, and if it deviates by 90 degrees or more, the torque in the opposite direction will be generated. [0004] Therefore, not only the detection accuracy of the sensor itself is important, but also the positioning accuracy of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/20H02P6/16H02P6/06H02P6/08H02P6/28
Inventor 安江正德
Owner MITSUBISHI ELECTRIC SHANGHAI ELECTRIC ELEVATOR
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