# US 11,905,937 B2 · Magnetic pole structure for hall thruster

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- Number: US 11,905,937 B2
- Document ID: US11905937B2
- Status: Granted
- Kind: B2
- Application number: 18/029,382
- Filed: 2021-11-15
- Published: 2023-11-09
- Granted: 2024-02-20
- Earliest claimed: 2020-12-28
- Assignees: Shanghai Institute of Space Propulsion
- Applicants: Shanghai Institute of Space Propulsion
- Inventors: Zhen Zhao; Jiabing Cheng; Xiaolu Kang; Yanan Wang; Leichao Tian; Zhiyuan Zhang; Qingqing Jia; Caixia Qiao; Guanrong Hang
- Web page: https://patentgrep.com/patent/US11905937B2

## CPC

- F03H 1/0068: {with a central channel, e.g. end-Hall type}
- F03H 1/0075: {with an annular channel; Hall-effect thrusters with closed electron drift}
- F03H 1/0006: {Details applicable to different types of plasma thrusters (arrangements specially adapted for fitting plasma engines in or to cosmonautic vehicles B64G1/413)}
- F03H: PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR (from combustion products F02K)

## Abstract

A magnetic pole structure for a Hall thruster is provided. The magnetic pole structure includes: multiple wide-envelope outer magnetic pole components, a magnetic bridge, a pagoda-shaped inner magnetic pole component, a top plate, and a bottom plate, where the multiple wide-envelope outer magnetic pole components are arranged on an outer edge of the Hall thruster, symmetrical about the pagoda-shaped inner magnetic pole component, and enclose a semi-open structure; the magnetic bridge is located between each of the wide-envelope outer magnetic pole components and the pagoda-shaped inner magnetic pole component; the bottom plate is attached to a bottom part of each of the wide-envelope outer magnetic pole components and a bottom part of the pagoda-shaped inner magnetic pole component; and the top plate is attached to an upper part of each of the wide-envelope outer magnetic pole components.

## Claims

### Claim 1

A magnetic pole structure for a Hall thruster, comprising: a plurality of wide-envelope outer magnetic pole components, a magnetic bridge, a pagoda-shaped inner magnetic pole component, a top plate, and a bottom plate, wherein the plurality of wide-envelope outer magnetic pole components are arranged on an outer edge of the Hall thruster and symmetrical about the pagoda-shaped inner magnetic pole component, and the plurality of wide-envelope outer magnetic pole components enclose a semi-open structure;
the magnetic bridge is located between each of the plurality of wide-envelope outer magnetic pole components and the pagoda-shaped inner magnetic pole component, and is connected with a magnetic circuit formed by each of the plurality of wide-envelope outer magnetic pole components and the pagoda-shaped inner magnetic pole component;
the bottom plate is attached to a bottom part of each of the plurality of wide-envelope outer magnetic pole components and a bottom part of the pagoda-shaped inner magnetic pole component;
the top plate is attached to an upper part of each of the plurality of wide-envelope outer magnetic pole components, and the top plate is provided with a central through hole; and
the magnetic bridge and the pagoda-shaped inner magnetic pole component are connected with an outer magnetic circuit through the central through hole; and
the pagoda-shaped inner magnetic pole component is composed of a pagoda-shaped inner magnetic pole, an upper inner magnetic coil, and a lower inner magnetic coil;
the pagoda-shaped inner magnetic pole comprises an upper part and a lower part, and the upper part has a diameter less than a diameter of the lower part;
the upper part of the pagoda-shaped inner magnetic pole is wound by the upper inner magnetic coil; and
the lower part of the pagoda-shaped inner magnetic pole is wound by the lower inner magnetic coil.

### Claim 2 (depends on 1)

The magnetic pole structure according to claim 1, wherein the magnetic bridge is formed by welding an inner ring and an outer ring; a cavity is formed between the inner ring and the outer ring; the inner ring and the outer ring are provided with uniformly spaced pores; and the outer ring is connected with an outer gas tube.

### Claim 3 (depends on 1)

The magnetic pole structure according to claim 1, wherein each of the plurality of wide-envelope outer magnetic pole components is composed of a wide-envelope outer magnetic pole and an outer magnetic coil; and the outer magnetic coil is wound on the wide-envelope outer magnetic pole.

### Claim 4 (depends on 1)

The magnetic pole structure according to claim 1, wherein each of the plurality of wide-envelope outer magnetic pole components has a circumferential length of d, n wide-envelope outer magnetic pole components have a length of nd, and a circumference is of L, wherein 0.5≤nd/L≤0.7.

### Claim 5 (depends on 1)

The magnetic pole structure according to claim 1, wherein the plurality of wide-envelope outer magnetic pole components are jointly enclosed by a metal mesh.

### Claim 6 (depends on 1)

The magnetic pole structure according to claim 1, wherein a ceramic plate is provided between the magnetic bridge and the lower inner magnetic coil; and an inner outlet ceramic ring and an outer outlet ceramic ring are arranged on an upper part of the magnetic bridge.

### Claim 7 (depends on 2)

The magnetic pole structure according to claim 2, wherein the magnetic bridge is made of a soft magnetic material.

### Claim 8 (depends on 7)

The magnetic pole structure according to claim 7, wherein a working temperature of the magnetic bridge falls in a working temperature range of the soft magnetic material, and is less than 0.78 Tc (Tc refers to Curie temperature).

### Claim 9 (depends on 1)

The magnetic pole structure according to claim 1, wherein the plurality of wide-envelope outer magnetic pole components and the magnetic bridge have a variety of shapes.