201042889 六、發明說明： 【發明所屬之技術領域】 本發明是有關於·一種無刷轴流風扇馬達，特別是指一 種整合型高壓無刷軸流風扇馬達。 【先前技術】 一般用於散熱風扇之交流馬達，係可直接配合一交流 電源（例如AC110V或AC220V之市電電源）進行驅動，以藉 由馬達之轉動而連動設於其轉軸上之扇輪單元來產生氣流 〇 輸出以進行散熱，但是’由於此種市電交流電源之頻率皆 在50〜60Hz左右，因此，該交流馬達之轉速即受到限制 (50Hz通常是2800 rpm以下），要再提升的空間相當有限， 進而無法輕易藉由提高馬達轉速來進一步增加產生之氣流 量0201042889 VI. Description of the Invention: [Technical Field] The present invention relates to a brushless axial flow fan motor, and more particularly to an integrated high pressure brushless axial flow fan motor. [Prior Art] An AC motor generally used for a cooling fan can be directly driven by an AC power source (for example, a commercial power source of AC110V or AC220V) to interlock the fan wheel unit provided on the rotating shaft by the rotation of the motor. The airflow output is generated for heat dissipation, but 'because the frequency of the mains AC power supply is around 50~60Hz, the speed of the AC motor is limited (50Hz is usually 2800 rpm or less), and the space to be upgraded is equivalent. Limited, and thus can not easily increase the generated air flow by increasing the motor speed.
有鑑於此，為了突破交流電源之頻率限制，相關業者 已陸續開發出利用單相直流無刷馬達配合霍爾IC的單相啟 動方式來取代習知的交流馬達’其做法通常是先對一交流 電原進行降壓、整流及遽波，以產生__適當之直流電壓（通 常為DC48V)，再配合控制IC來驅動該單相直流無刷馬達 但疋，單相直流無刷馬達由於驅動線圈電流無法持續 穩流動的先天限制，造成輸出扭力不連貫，轉矩性能低 落’ °呆音振動也隨之增加。 達幹Π車:於馬達之功率=電壓x電流，因此在同樣之馬 達輪出功率條件下…個較低㈣壓值即代表對應的電流 3 201042889 元件升⑧，進而必須使用具有耐高電流特性之電路 =或馬達造成破壞。但是，此類耐高電流的電路元= 難取得’其價格也較為昂貴，無疑會提高電路的製 :’且額外的高電流保護電路同樣也會增加整體 的體積與製造成本。 再者，由於該單相直流無刷馬達是在相對高電流的狀 況下運轉’其運轉時的溫度上升程度相較於低電流的操作 方式要而’若在實際使用時無法對該馬達進行有效散熱， 則相當容易產生馬達過熱的情形。 【發明内容】 —此本發明之目的，即在提供一種高電壓、低電流 的二：直流無刷軸流風扇馬達驅動方式以有效降低馬達 運轉時之溫升，且不需使用耐高電流之電路元件以節省驅 動電路之製造成本的整合型高壓無刷軸流風扇 馬達。 於疋’本發明整合型高麼無刷轴流風扇馬達是與一 交流電源電連接，該無刷軸流風扇馬達包含：__基座、— 疋子早7L…轉子單元一整流濾波單元、—電源供應單 元，及一控制單元。 該定子單元具有多數設置於該基座上的極臂，以及分 別纏繞於相對應之極臂上的[線圈、第二線圈，第三線 圈，其中，該等極臂之數量為三的倍數，且該第一、二、 三線圈是等距間隔地平均分佈纏繞於該等極臂上。 該轉子單元是可樞轉地設置於言玄基座_L，且是被該第 201042889 " 一、第一、第二線圈及對應之極臂所驅動而旋轉。 該整流濾波單元具有一與該交流電源電連接的整流器 ，以及一與該整流器電連接的金屬化薄膜電容器，該整流 器及金屬化薄膜電容器是分別對該交流電源進行整流及濾 波’以將該父流電源轉換為一直流電源。 该電源供應單元是與該整流濾波單元之金屬化薄膜電 容器電連接，以將該直流電源轉換為一穩定之工作電壓並 輸出。 ° $控制單元具有-與該定子單元之第-線圏、第二線 圈、第三線圈、該電源供應單元，及該整流濾波單元之金 屬化薄膜電容器電連接的主控晶片，以及三個分別與該主 控晶片電連接並偵測該轉子單元之相對轉動位置的霍爾元 件，該主控晶片是援引該電源供應單元之工作電壓來作為 自身之工作電源，並將該直流電源輸送至該第一、第二， 及第三線圈使其與對應之極臂產生激磁效應，且是與該等 〇 霍爾元件相配合地控制該第一、第二、第三線圈的通電狀 態，以對該轉子單元進行三相驅動。 本發明之功效在於，利用該整流單元直接將該交流電 源轉換為一個直流電源，以配合該控制單元來將該直流電 原輸送至δ亥二相直流無刷軸流風扇馬達，進而以高電壓、 低電机之方式來對該三相直流無刷軸流風扇馬達進行驅動 x避免耐尚電流電路元件的使用，並提升馬達整體之運 轉效率，並使其轉速不受電源之頻率控制，進而大幅提升 軸流風扇之散熱效率。 5 201042889 【實施方式】 有關本發明之前述及其他技術内容'特點與功效，在 以下配合參考圖式之一個較佳實施例的詳細說明中將可 清楚的呈現。 參閱圖1、2,並配合參閱圖3,本發明整合型高壓無 刷軸流風扇馬達之較佳實施例，是與一交流電源1 〇〇電連 接’該無刷軸流風扇馬達包含：一基座4、一定子單元5 一轉子單元6、一整流濾波單元丨、一電源供應單元2，及 一控制單元3。 該定子單元5具有多數間隔設置於該基座4上的極臂 51 ’以及分別依序纏繞於相對應之極臂51上的第一線圈52 、第二線圈53’及第三線圈54,其中，該等極臂51之數 量為三的倍數，且該第一、二、三線圈52、53、54是等距 間隔地平均分佈纏繞於該等極臂5丨上。在本實施例中，是 採用具有九支極臂51的配置方式，也就是說，該第—線圈 52會纏繞於第一、四、七支極臂51上’該第二線圈53是 纏繞於第一、五、八支極臂51上，而該第三線圈54則是 纏繞於三、六、九支極臂51上的三相纏繞方式。值得注意 的是’本實施例僅是以九支極臂51的配置態樣來舉例說明 ，但也可以採用其他極臂51數量之配置方式（例如6支或 12支）’只要極臂51之數量為三或三的倍數以配合三相纏 繞之實施即可，在此並不加以設限。 該轉子單元6具有一可枢轉地設置於該基座4上的轉 軸61、一設置於該轉軸61上的輪轂62，以及一固設於該 201042889 輪轂62上，且是被該第一、第二、第三線圈52、53、54 及對應之極臂51所配合產生之激磁效應而驅動旋轉，進而 連動該輪轂62及轉軸61 —併轉動的磁鐵環63。 回顧圖2、3，並配合參閲圖4，該整流濾波單元1是 與該交流電源100電連接，並將該交流電源100轉換為一 直流電源。在本實施例中，該交流電源1〇〇為一個50Hz、 AC220V之市電交流電源，而該整流濾波單元i具有一與該 交流電源100電連接的整流器U，以及一與該整流器11電 〇 連接的金屬化薄膜電容器12，該整流器11及金屬化薄膜電 容器12是分別對該交流電源進行整流及濾波，以將該交流 電源100轉換為一穩定之直流電源。在本實施例中，該整 流器11為一橋式整流器（Bridge Rectifier)，以直接將該 50Hz、AC220V之交流電源1〇〇轉換為約DC310V之直流電 源。而上述電壓換算之基礎為：由於一般之市電交流電源 100通常是呈正弦波形式，且所謂之AC220V其所指的是平 ❹ 均電壓值（RMS value)，而其對應之峰值（peak vaiue)即是以 平均電壓值乘以2的平方根（220x/2)來計算，也就是約為 310V。至於橋式整流器之細部電路結構及工作原理，應為 所屬技術領域中具有通常知識者所熟悉的技術，在此即不 加以贅述。 該電源供應單元2是與該整流濾波單元丨之金屬化薄 膜電容器12電連接，以將該直流電源轉換為一穩定且相對 較低之工作電壓並輸出，在本實施例中，該電源供應單元2 為一切換式電源供應器（switching p〇wer supply)。藉此切換 7 201042889 式的電源設計，相較於以往線性式的電源設計，更可確保 其所供予後級電路之工作電壓能夠更為穩定’而此類切換 式電源1、應器應屬於電力電子（p〇wer electr〇nics)領域中具 有通常知識者所熟悉的電路結構，在此即不對其細部電路 組成及工作原理進行贅述。 該控制單元3具有一與該定子單元5之第一線圈52、 第一線圈53、第三線圈54、該電源供應單元2，及該整流 濾波單凡1之金屬化薄膜電容器12電連接的主控晶片， 以及三個分別與該主控晶片31電連接，並藉由該轉子單元 6之磁鐵環63來偵測該轉子單元6整體之相對轉動位置的 霍爾兀件32,該主控晶片31是具有内建脈波寬度調變 (Pulse·Width Modulation，PWM)功能之馬達控制 IC，且是 援引該電源供應單元2之工作電壓來作為自身之工作電源 ，並將該直流電源輸送至該第一、第二，及第三線圈52、 53、54使其與對應之極臂51產生激磁效應，且是與該等霍 爾元件32相配合地控制該第一、第二、第三線圈52、53、 54的通電狀態，以對該轉子單元6進行三相驅動，而該霍 爾元件32即為現有之利用霍爾效應而偵測磁場變動的霍爾 效應偵測器（Hall-effect sens〇r)。 另外要注意的是，該控制單元3更具有一與該主控晶 片31電連接的可變電阻式熱敏電阻迴路33及一轉向控制 器34，該熱敏電阻迴路33是用於偵測環境週遭之溫度，以 與s亥主控晶片33相配合地依據環境週遭之溫度而控制該轉 子單兀6之轉速，而該轉向控制器34則為一切換開關可 201042889 — :使用者藉由切換其開關狀態來決定該轉子單元6之正轉 或反轉。另外，該控制單元3更可提供轉速偵測之功能， 僅需在圖4中所標示之A點上外接一轉速偵測器(圖未示)即 可。 藉由上述設計，本發明整合型高壓無刷軸流風扇馬達 ’具有下列優點： 1·整體電路精簡且製造成本低： 〇 本發明藉由該交流電源100提供電源，並在不 降壓的情況下直接利用該整流濾波單元1將該交流 電源100轉換為一個與其電壓峰值相當的直流電源 ，進而是以一個高電壓、低電流的三相運轉方式， • 因此，在相同的輸出功率條件下，本發明之整體驅 動電路不需使用到耐高電流的電路元件即可製作， 因此在電路元件的選擇彈性上即相對較大，有助於 降低整體電路的製造成本。 D 再者，使用此種高電壓、低電流的馬達驅動方 式也可省去額外之高電流保護電路，進而使整體電 路的體積能夠更為精簡。 2·運轉效率高： 相較於習知的單相直流無刷馬達僅能達到35% 的運轉效率，本發明利用三相驅動架構之馬達可將 運轉效率提升至約75%’耗電量也只有習知單相無 刷直流馬達的一半’此外’在馬達之操作電流相對 較小的情況下，其在運轉時之溫度也相對較低， 9 201042889 有效降低馬達之線圈因電流過高而損壞的機率，有 助於延長馬達之使用壽命，並達到節能減碳之效果 0 3.馬達轉速可突破頻率之限制，大幅提高風量與靜壓 相較於習知交流馬達之轉速受限於供電源之頻 率’本發明之三相直流架構之馬達可輕易達到 PM以上，以藉此提升軸流風扇所能夠產生之 風量與靜壓’進而有助於提升風扇龍之散熱效能 〇 歸納上述，本發明整合型高壓無刷軸流風扇馬達，利 用該整流纽單元1直接將該交流電源、i⑽整流成—直流 電源，再配合該控制單A 3進行高電壓、低電流的三相: 動，進而不需使用到能夠耐高電流之電路元件，進而能夠 有效降低整體電路製造成本’並具有馬達的耗損率低、馬 達運轉溫升低，以及運轉效率高㈣點，並可成功突破t 源頻率對於馬達轉速之限制，故確實能達到本發明之目的 〇 惟以上所述者，僅為本發明之較佳實施例而已，當不 能以此限定本發明實施之範圍，即大凡依本發明申請:利 範圍及發明說明内容所作之簡單的等效變化與修飾皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一系統方塊示意圖，說明本發明整合型高壓無 10 201042889 刷軸流風扇馬達之較佳實施例與一交流電源之間的配置情 形； 圖2是一立體圖，說明該較佳實施例之結構； 圖3是一結構示意圖，說明本發明之一定子單元之結 構示意；及 圖4是一電路圖，說明圖1中之該較佳實施例的細部 電路結構。In view of this, in order to break the frequency limitation of AC power, related companies have successively developed a single-phase starting method using a single-phase DC brushless motor with Hall IC to replace the conventional AC motor. The original step-down, rectification and chopping to generate __ appropriate DC voltage (usually DC48V), and then with the control IC to drive the single-phase DC brushless motor, but 单, single-phase DC brushless motor due to drive coil current Unable to continue the steady flow of the innate limit, resulting in inconsistent output torque, low torque performance ° ° sound vibration also increased.达干Π车: The power of the motor = voltage x current, so under the same motor wheel power condition... a lower (four) pressure value means that the corresponding current 3 201042889 component rises 8, and must be used with high current resistance The circuit = or the motor caused damage. However, such high-current-resistant circuit elements = difficult to obtain 'it is expensive, and will undoubtedly increase the circuit's system' and the additional high-current protection circuit will also increase the overall size and manufacturing cost. Furthermore, since the single-phase brushless DC motor is operated under a relatively high current condition, the temperature rise during operation is higher than that of the low current operation, and the motor cannot be effectively used in actual use. Heat dissipation is quite easy to cause the motor to overheat. SUMMARY OF THE INVENTION - The purpose of the present invention is to provide a high voltage, low current two: DC brushless axial fan motor drive mode to effectively reduce the temperature rise of the motor operation, and does not need to use high current resistance Circuit components are integrated high-pressure brushless axial fan motors that save the manufacturing cost of the drive circuit.于疋' The integrated high-quality brushless axial fan motor of the present invention is electrically connected to an AC power source, and the brushless axial flow fan motor comprises: __ base, - 疋子早 7L... rotor unit-rectification filter unit, - a power supply unit, and a control unit. The stator unit has a plurality of pole arms disposed on the base, and [coils, second coils, and third coils respectively wound on the corresponding pole arms, wherein the number of the pole arms is a multiple of three, And the first, second, and third coils are equally distributed around the equipotential arms at equal intervals. The rotor unit is pivotally disposed on the base _L, and is rotated by the first and second coils and the corresponding pole arm. The rectifying and filtering unit has a rectifier electrically connected to the AC power source, and a metallized film capacitor electrically connected to the rectifier, the rectifier and the metallized film capacitor respectively rectifying and filtering the AC power source to the parent The streaming power is converted to a DC power supply. The power supply unit is electrically connected to the metallized film capacitor of the rectifying and filtering unit to convert the DC power source into a stable operating voltage and output. The control unit has a main control chip electrically connected to the first coil 圏, the second coil, the third coil, the power supply unit, and the metallized film capacitor of the rectifying filter unit, and three separate a Hall element electrically connected to the main control chip and detecting a relative rotational position of the rotor unit, the main control chip is to invoke the operating voltage of the power supply unit as its own working power source, and deliver the DC power source to the The first, second, and third coils generate an exciting effect with the corresponding pole arm, and control the energization states of the first, second, and third coils in cooperation with the first Hall elements, The rotor unit is driven in three phases. The utility model has the advantages that the rectifying unit directly converts the alternating current power source into a direct current power source, so as to cooperate with the control unit to transport the direct current electric source to the δHai two-phase DC brushless axial flow fan motor, thereby high voltage, Low-motor mode to drive the three-phase DC brushless axial fan motor x to avoid the use of current-resistant circuit components, and improve the overall operating efficiency of the motor, and its speed is not controlled by the frequency of the power supply, and thus Improve the heat dissipation efficiency of the axial fan. [Embodiment] The above and other technical features of the present invention will be apparent from the following detailed description of the preferred embodiments. Referring to Figures 1 and 2, and with reference to Figure 3, a preferred embodiment of the integrated high-pressure brushless axial fan motor of the present invention is electrically connected to an AC power source 1'. The brushless axial fan motor comprises: The base 4, the fixed subunit 5, a rotor unit 6, a rectifying and filtering unit, a power supply unit 2, and a control unit 3. The stator unit 5 has a plurality of pole arms 51 ′ spaced apart from the base 4 and first coils 52 , second coils 53 ′ and third coils 54 respectively wound on the corresponding pole arms 51 . The number of the pole arms 51 is a multiple of three, and the first, second, and third coils 52, 53, 54 are evenly distributed and equally wound around the pole arms 5A. In this embodiment, the configuration has nine pole arms 51, that is, the first coil 52 is wound around the first, fourth, and seventh pole arms 51. The second coil 53 is wound around The first, fifth and eighth poles 51 are on the other hand, and the third coil 54 is a three-phase winding method wound around the three, six and nine pole arms 51. It should be noted that the present embodiment is exemplified only by the configuration of the nine pole arms 51, but the configuration of the number of other pole arms 51 (for example, six or twelve) may be employed as long as the pole arm 51 The number is a multiple of three or three to match the implementation of the three-phase winding, and is not limited herein. The rotor unit 6 has a rotating shaft 61 pivotally disposed on the base 4, a hub 62 disposed on the rotating shaft 61, and a fixed body on the 201042889 hub 62, and is the first The second and third coils 52, 53, 54 and the corresponding pole arm 51 cooperate to generate an exciting effect to drive the rotation, thereby interlocking the hub 62 and the rotating shaft 61 and rotating the magnet ring 63. Referring back to Figures 2 and 3, and referring to Figure 4, the rectifying and filtering unit 1 is electrically connected to the AC power source 100 and converts the AC power source 100 into a DC power source. In this embodiment, the AC power supply 1 is a 50 Hz, AC 220V commercial AC power supply, and the rectification and filtering unit i has a rectifier U electrically connected to the AC power supply 100, and an electrical connection with the rectifier 11 The metallized film capacitor 12, the rectifier 11 and the metallized film capacitor 12 respectively rectify and filter the AC power source to convert the AC power source 100 into a stable DC power source. In this embodiment, the rectifier 11 is a bridge rectifier to directly convert the 50 Hz, AC 220V AC power supply to a DC power of about DC 310V. The basis of the above voltage conversion is: since the general commercial AC power supply 100 is usually in the form of a sine wave, and the so-called AC220V refers to the RMS value, and the corresponding peak (peak vaiue) That is, it is calculated by multiplying the average voltage value by the square root of 2 (220x/2), that is, about 310V. As for the detailed circuit structure and working principle of the bridge rectifier, it should be a technique familiar to those skilled in the art, and will not be described herein. The power supply unit 2 is electrically connected to the metallized film capacitor 12 of the rectifying and filtering unit , to convert the DC power into a stable and relatively low operating voltage and output. In this embodiment, the power supply unit 2 is a switching power supply (switching p〇wer supply). By switching the 7 201042889 type power supply design, compared with the previous linear power supply design, it can ensure that the working voltage supplied to the latter stage circuit can be more stable' and such switching power supply 1 should be part of the power supply. In the field of electronics (p〇wer electr〇nics), there is a circuit structure familiar to those of ordinary skill, and the detailed circuit composition and working principle are not described here. The control unit 3 has a main connection with the first coil 52 of the stator unit 5, the first coil 53, the third coil 54, the power supply unit 2, and the metallized film capacitor 12 of the rectifying filter. a control chip, and three Hall elements 32 respectively electrically connected to the main control chip 31 and detecting the relative rotational position of the rotor unit 6 by the magnet ring 63 of the rotor unit 6, the main control chip 31 is a motor control IC having a built-in pulse width modulation (PWM) function, and refers to the operating voltage of the power supply unit 2 as its own working power source, and supplies the DC power source to the The first, second, and third coils 52, 53, 54 cause an excitation effect with the corresponding pole arm 51, and control the first, second, and third coils in cooperation with the Hall elements 32. The energization state of 52, 53, 54 is to drive the three-phase drive of the rotor unit 6, and the Hall element 32 is a Hall effect detector that detects the magnetic field fluctuation by using the Hall effect (Hall-effect). Sens〇r). It should be noted that the control unit 3 further has a variable resistance thermistor circuit 33 electrically connected to the main control chip 31 and a steering controller 34 for detecting the environment. The surrounding temperature controls the rotation speed of the rotor unit 6 according to the ambient temperature in cooperation with the sigma master chip 33, and the steering controller 34 is a switch switch 201042889 - the user switches Its switching state determines the forward or reverse rotation of the rotor unit 6. In addition, the control unit 3 can further provide the function of the speed detection, and only needs to connect a speed detector (not shown) to the point A indicated in FIG. With the above design, the integrated high-pressure brushless axial flow fan motor of the present invention has the following advantages: 1. The overall circuit is simplified and the manufacturing cost is low: 〇 The present invention provides power by the AC power source 100, and does not step down. Directly using the rectifying and filtering unit 1 to convert the AC power source 100 into a DC power source equivalent to its voltage peak, and thus a three-phase operation mode of high voltage and low current, and therefore, under the same output power condition, The overall driving circuit of the present invention can be fabricated without using a circuit component resistant to high current, and thus is relatively large in the selection flexibility of the circuit component, contributing to a reduction in the manufacturing cost of the overall circuit. In addition, the use of this high-voltage, low-current motor drive eliminates the need for additional high-current protection circuits, which in turn makes the overall circuit compact. 2. High operating efficiency: Compared with the conventional single-phase DC brushless motor, only 35% of the operating efficiency can be achieved. The present invention can increase the operating efficiency to about 75% by using a three-phase driving structure motor. Only half of the conventional single-phase brushless DC motor is 'other', when the operating current of the motor is relatively small, the temperature during operation is relatively low, 9 201042889 effectively reduces the damage of the motor coil due to excessive current. The probability of helping to extend the life of the motor and achieve the effect of energy saving and carbon reduction. 3. The motor speed can break through the frequency limit, greatly increasing the air volume and static pressure. Compared with the conventional AC motor, the speed is limited by the power supply. The frequency of the motor of the three-phase DC structure of the present invention can easily reach above PM, thereby increasing the air volume and static pressure that can be generated by the axial fan, thereby contributing to the improvement of the heat dissipation performance of the fan dragon. The integrated high-pressure brushless axial flow fan motor directly rectifies the AC power source and i(10) into a DC power source by using the rectifier unit 1, and then performs high voltage with the control unit A3. The three-phase of the current: moving, and thus eliminating the need to use circuit components capable of withstanding high currents, thereby effectively reducing the overall circuit manufacturing cost', and having a low motor wear rate, low motor operating temperature rise, and high operating efficiency (four) points, The present invention can be successfully achieved by the fact that the t-source frequency is limited to the motor speed. Therefore, the above description is only for the preferred embodiment of the present invention, and the scope of the present invention cannot be limited thereto. That is, the simple equivalent changes and modifications made by the present invention in the scope of the invention and the scope of the invention are still within the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic block diagram showing a configuration between a preferred embodiment of an integrated high-voltage non-10 201042889 brush axial flow fan motor and an AC power supply; FIG. 2 is a perspective view illustrating FIG. 3 is a structural schematic view showing the structure of a stator unit of the present invention; and FIG. 4 is a circuit diagram showing the detailed circuit structure of the preferred embodiment of FIG. 1.
11 201042889 【主要元件符號說明】 1 ....... …整流濾波單元 5…… •…定子單元 11…… …整流器 51 …·· …·極臂 12…… …金屬化薄膜電容 52….· …·第一線圈 器 53…… •…第二線圈 2 ....... …電源供應單元 54 •…第三線圈 η ....... ...如t生!1 留 ； f....... J ....... …役制早兀 0 得卞早7L 31…… …主控日日片 61 ·_.·· …·轉軸 32…… …霍爾元件 62·.··· …·輪轂 33…… …熱敏電阻迴路 63·..·· •…磁鐵環 34…… …轉向控制器 100… •…交流電源 4 ....... …基座 1211 201042889 [Description of main component symbols] 1 ....... Rectifier filter unit 5... • Stator unit 11 ... Rectifier 51 ...····Pole arm 12... Metallized film capacitor 52... . . . ... first coiler 53... •...second coil 2 . . . ... power supply unit 54 •...third coil η ....... ...such as t raw! Leave; f....... J ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Hall element 62······· Hub 33... Thermistor circuit 63·..··•... Magnet ring 34... Steering controller 100... •...AC power supply 4... . . base 12