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Detection method for accurately measuring initial magnetic pole angle of synchronous motor

A synchronous motor and precise measurement technology, which is applied in vector control systems, control generators, electronic commutation motor control, etc., to achieve cost-saving effects

Active Publication Date: 2010-06-30
SHANGHAI GIE EM
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Problems solved by technology

At the same time, it also successfully solved the problem of detecting the magnetic pole position of the rotor when the brake is locked. When replacing the encoder, there is no need to remove the wire rope, which saves the maintenance cost of the elevator and greatly facilitates the use and maintenance of the elevator.

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  • Detection method for accurately measuring initial magnetic pole angle of synchronous motor
  • Detection method for accurately measuring initial magnetic pole angle of synchronous motor
  • Detection method for accurately measuring initial magnetic pole angle of synchronous motor

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Embodiment Construction

[0026] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0027] see Figure 4a , 4b, ABC in the figure is a stationary three-phase coordinate system, D represents the direction of the assumed D-axis, and the angle between it and the A-axis of the stationary coordinate system is θ r . The rated operating point of the synchronous motor core is generally designed in such as Figure 4c Point A of the excitation curve shown in the figure. When a voltage space vector is applied in the direction of the magnetic pole N, a current will be generated in the direction of the magnetic pole N.

[0028] Such as Figure 4a As shown, the solid line with arrows represents the direction of stator flux linkage generated by the stator current, and the arrow with dotted lines represents the direction of rotor flux link...

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Abstract

The invention discloses a detection method for accurately measuring an initial magnetic pole angle of a synchronous motor. A frequency converter finishes drive control so as to start with the maximal torque under the condition that the synchronous motor is matched with an ABZ encoder. Meanwhile, the problem that the magnetic pole position of a rotor is detected in case of braking is solved successfully. During exchanging the encoder, a steel wire rope is unnecessarily disassembled. Therefore, the maintenance cost of the lift is saved and the use and maintenance of the lift are convenient. Due to the adoption of the detection method, a synchronous tractor only needs to be provided with the ABZ encoder without an expensive UVW+AB type encoder or a SinCos encoder. Therefore, the system cost is greatly saved.

Description

Technical field: [0001] The invention relates to the application field of a synchronous motor servo drive in an elevator system, in particular to a detection method for accurately measuring the initial magnetic pole angle of a synchronous motor. Background technique: [0002] In the elevator system, based on the consideration of the efficiency of the traction machine, the original asynchronous traction machine has been widely replaced by the synchronous traction machine. The original asynchronous traction machine only needs to cooperate with the incremental encoder of ABZ type to measure the speed, so as to realize the speed control of the elevator. When a synchronous traction machine is used, a UVW+ABZ square wave encoder is commonly used. One is a SIN / COS encoder. The UVW encoder has magnetic poles, which need to be the same as the number of magnetic pole pairs of the host. The SIN / COS encoder is essentially a resolver, which outputs sine / cosine analog signals, which ar...

Claims

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Application Information

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IPC IPC(8): H02P6/16H02P21/32
Inventor 吴志敢胡亚山
Owner SHANGHAI GIE EM
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