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A motor rotor position detection device

A technology for motor rotors and detection devices, applied to circuit devices, using electric/magnetic devices to transmit sensing components, electrical components, etc., can solve problems such as difficult structural layout, non-contact power supply methods for modulated rotors, etc., and achieve space The layout is flexible and diverse, the axial structure of the device can be adjusted flexibly, and the effect of strong anti-interference

Active Publication Date: 2021-02-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 3) In special occasions, the structural layout is more difficult
[0014] But this invention does not give how to specifically realize the modulation of the rotor position to WPT and how to realize the non-contact power supply method of the rotor

Method used

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  • A motor rotor position detection device
  • A motor rotor position detection device
  • A motor rotor position detection device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This embodiment focuses on how to realize the modulation effect of the rotor position on the mutual inductance.

[0050] The device in this embodiment is a rotor position detection device with 4 pairs of poles.

[0051]The primary and secondary windings are composed of an even number of coils with the same structure. Each coil is evenly distributed along the circumference, and its axis is parallel to the axis of the motor. image 3 (3a) is a schematic diagram of the winding structure of the primary and secondary windings of the four-pair pole detection device described above, wherein each coil is circular, and one primary winding is used to establish the excitation magnetic field, one secondary winding, and the primary , The secondary side is coupled by air and there is no iron core, the primary winding is consolidated with the rotor, and the mutual inductance between the primary side and the secondary side changes approximately sinusoidally with the rotor position unde...

Embodiment 2

[0065] This embodiment focuses on how to set up an excitation circuit on the basis of Embodiment 1 to realize the passive design on the rotor side.

[0066] Figure 7 , 8 The implementation methods of the excitation circuit in the case of quadrature double-winding and single-winding are given respectively.

[0067] The field circuit has a field winding and a relay winding, both with compensation circuits. The function of the excitation circuit is to realize the passive design of the primary winding.

[0068] A schematic diagram of the coil structure (of the excitation winding and the relay winding) conforming to the above expression is as follows: Figure 9 express. The excitation winding and the relay winding of the excitation circuit are composed of a circular coil whose axis is the rotation axis of the motor. The mutual inductance between windings is small enough to be ignored.

[0069] Notice, Figure 9 The coil structure can be used not only as a coil placed on the...

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Abstract

The invention relates to a motor rotor position detection device, which has a primary winding with a compensation circuit and at least one secondary winding with a compensation circuit, and the magnetic coupling resonant wireless power transmission is realized between the primary and secondary windings; the primary and secondary The side windings each include a coil module, which is formed by connecting an even number of coils with the same structure. The axes of the coils are all parallel to the rotation axis of the rotor of the motor. Through axial magnetic coupling, the winding directions of adjacent coils are opposite to form a staggered pattern. N, S magnetic poles, the mutual inductance between the primary and secondary windings alternates with the rotor rotation period; the primary winding is connected with an excitation circuit, and the excitation circuit applies AC excitation to the primary winding and makes it work in a resonance state; The secondary winding is connected to an external detection circuit. Compared with the prior art, the present invention has the advantages of flexible and diverse spatial arrangement, small size, high precision, strong applicability, etc., and can also realize signal input and output based on the stator side, that is, the rotor is passive design.

Description

technical field [0001] The invention belongs to the technical field of position detection and measurement, and relates to a motor rotor position detection device, in particular to a motor rotor position detection device based on the principle of magnetic coupling resonance wireless power transmission. The position detection device can also be used for other non-contact position detection. Background technique [0002] Motor position detection is an important reference for motor control. [0003] In the current motor position detection, the resolver is one of the most important forms, such as figure 1 shown. Taking a common reluctance resolver as an example, generally one primary excitation winding and several (generally two sine and cosine) secondary detection windings are set, and the magnetic permeability between the excitation winding and detection winding changes with the change of the motor rotor , thereby causing a change in the mutual inductance between the two. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/14H02J50/12
CPCG01D5/14H02J50/12
Inventor 钟再敏胡程宇
Owner TONGJI UNIV
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