ホール磁気回路選定ツール

Enter magnet dimensions, material grade and operating temperature to directly compute the Hall operate stroke, release stroke and hysteresis; the dual-Hall ring scheme gives a quadrature phase-error budget and breaks the error into four items - air gap, mounting, threshold mismatch and ring pole pitch - so you know where the tolerance budget should go.

Kernel: surface-charge method; cross-checked against the axial closed-form solution with error < 0.1%; valid for near-field cases without magnetic return path.

デバイス

ユニポーラ/オムニポーラのみ

実装方式

磁石

材料

使用条件

形状概略図

ストローク結果

動作ストローク S_op—mm
リリースストローク S_rp—mm
ヒステリシス ΔS—mm
全温度域ストロークバンド—mm

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ストローク–磁界曲線

The horizontal axis is the magnet-to-chip travel, far on the left and near on the right. The horizontal dashed lines are the operate threshold Bop and release threshold Brp; the red dot marks the operate-stroke point and the green one the release-stroke point.

SC245X 4段比較

型番Bop range (Gs)S_op(mm) S_rp(mm)全温度域バンド(mm)判定

Compare grades under the same magnet and mounting. Higher-sensitivity parts give longer operating stroke but are also more sensitive to stray fields.

Device (two of same type)

ラッチタイプのみ

検知モード

多極リング

材料

公差予算

形状概略図

直交結果

実装角度—°機械
2 個間隔—mm
エアギャップ磁界ピーク—Gs
最悪直交誤差—°電気

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Error-source breakdown

誤差源誤差(°電気角)比率伝導メカニズム

2 路出力波形

The horizontal axis is one full ring revolution = 360 deg mechanical. The upper half is the field‘s sensing component at the air gap; the two dashed lines are the operate thresholds +/-Bop. The lower half is the digitized output of the A/B comparators - the two quadrature high/low levels seen on a scope. One revolution holds P electrical periods (2P poles), so each channel shows P high and P low levels per turn; a larger P packs the pulses denser. The rising edges of the two square waves occur when the field crosses +/-Bop, ideally 90 deg electrical apart.

極対数スイープ

P実装角(°機械)Amplitude (Gs) ミスマッチ°実装°エアギャップ° 最悪°2 個間隔(mm)判定

Pole-pair count is the parameter customers change most often, and the same mechanical tolerance is amplified P times - this table directly judges whether a given ring scheme meets the target quadrature accuracy. The "two-device spacing" is the chord at 90 deg electrical; if it is smaller than the package footprint width it is flagged red, meaning the two devices cannot be placed side by side at that radiuscannot be placed side by side physically。

デバイス

タイプ別グループ

構造

磁石

材料

結果

判定成分—Gs
室温余裕—%
全温度域最悪余裕—%
室温判定—

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温度スイープ

Scan temperature at the tolerance upper-limit air gap. The solid line also serves as the vertical position; the red line toward -Bop is the worst-case threshold including tolerance.

デモ種別

デバイス

—

磁石

材料

使用条件

位置関係アニメーション

Below the position view is the field scale: the horizontal axis is the sensing component in Gauss (Gs); darker blocks mean stronger field and the sign shows field direction. The two vertical lines are the operate threshold Bop and release threshold Brp; the white dot is the measured field at the magnet‘s current position. The block beside the Hall in the figure shares the same colour scale as the ruler, so you can read them off directly.

磁界と出力状態

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The kernel is the surface-charge method (B = Br/4π·Σ dA·r/|r|³), cross-checked against the axial closed-form solution with error under 0.1%. It suits near-field selection estimates without a magnetic return path; it does not replace 3-D FEM when a back-iron or skewed multi-pole is present.

Device parameters: the SC245X family uses values from the Semiment datasheet Rev.V1.1 table 9.2 (1 mT = 10 Gs); the other parts are taken from the Notion Hall product library, with tolerances not published by the manufacturer counted at a general +/-10 Gs.

計算例(静的、引用可)

Results below are computed by the same kernel at build time with identical parameters — use them to cross-check trend and magnitude.

近接スイッチ計算例

φ10×5 mm cylindrical NdFeB 42SH, full temperature range -40 to 150 °C, stroke boundary under air-gap tolerance.

型番Bop typ. / max (Gs)実装方式動作ストローク (mm)リリースストローク (mm)ヒステリシス (mm)全温度域ストロークバンド (mm)
SC245025 / 35端面正対29.0935.045.9624.14 ~ 36.13
SC2451100 / 120端面正対17.1318.271.1414.88 ~ 19.35
SC2452180 / 200端面正対13.4615.411.9511.98 ~ 14.65
SC2455220 / 250端面正対12.3413.781.4410.84 ~ 13.63
SC245025 / 35平面横断23.4028.495.0918.91 ~ 29.40
SC2451100 / 120平面横断7.847.960.117.57 ~ 13.29
SC2452180 / 200平面横断7.347.640.307.06 ~ 7.53
SC2455220 / 250平面横断7.147.390.256.81 ~ 7.37

デュアルホール直交計算例

Multi-pole ring Ro 20 / Ri 14 / L 6 mm, air gap 2 mm, both Hall devices are SC2943, Mounting tolerance +/-0.1 mm, air-gap deviation +/-0.2 mm, ring pole-pitch error +/-1 deg, target quadrature accuracy +/-10 deg electrical.

極対数 P検知モード実装角度 (°機械)磁界ピーク (Gs)閾値ミスマッチ (°)実装誤差 (°)エアギャップ偏差 (°)最悪合計 (°)直交 ±10°
2ラジアル45.0031870.040.521.402.96PASS
2アキシャル45.0029360.040.671.523.24PASS
4ラジアル22.5032210.071.042.985.09PASS
4アキシャル22.5030610.091.353.315.75PASS
6ラジアル15.0030630.111.564.987.65PASS
6アキシャル15.0029150.132.025.949.08PASS
8ラジアル11.2527790.142.087.2410.47FAIL
8アキシャル11.2525820.172.708.9312.80FAIL
10ラジアル9.0024490.182.609.6213.41FAIL
10アキシャル9.0021950.223.3712.0316.62FAIL
12ラジアル7.5021180.233.1312.0816.43FAIL
12アキシャル7.5018200.294.0415.1320.46FAIL

Magnet material temp drift

磁石材料Br@20°C (T)Br@150°C (T)低下最高動作温度
NdFeB N421.3001.097-15.6%80 °C
NdFeB 42SH1.3001.114-14.3%150 °C
NdFeB N521.4451.220-15.6%80 °C
Ferrite Y300.3900.294-24.7%250 °C
Ferrite Y350.4100.309-24.7%250 °C
SmCo YXG-26H1.0350.988-4.5%350 °C

If margin still worries you, or you want parameters tailored to your magnet and structure, just send the magnet drawing and mounting dimensions.

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