A7 五、發明説明（I ) 技^術範圍 (請先閲讀背面之注意事項再填寫本頁) 本發明有關一種線性電機馬達，尤指冷煤壓縮機之線性馬 達頻率控制。 _背蒉抟蘸 簡言之，冷煤壓縮機包括一裝設於兩彈簧間之電樞以驅動 冷煤壓縮機之活塞。該電樞因線圈繞組驅動而壓縮彈簧形成前 後往復運動。 此種線性運動壓縮機因電樞質量及彈簧拉力作用而會產生 自然的諧振頻率（Resonant Frequency)。由於活塞接合電樞，諧 振頻率將受到作用於活塞負荷之影響。在多數運用場合，該負 荷並非常數，因此壓縮機之諧振頻率亦非常數。爲達到較高頻 率，線性馬達應在壓縮機之諧振頻率値受驅動。亦即，驅動器 頻率應盡可能接近線性馬達壓縮機之諧振頻率。 有多種不同之既有技術企圖將驅動器頻率與壓縮機諧振頻 率同步化，其中一種方法爲測量壓縮機高壓側及低壓側之壓 力，而驅動器則依據該等測量壓力加以調整。此種方法之缺點 爲，並未考慮到線性馬達壓縮機在製造加工程序所引起壓縮機 線性馬達初始諧振頻率之既有變化。 經濟部中央標準局員工消費合作社印¾ 另一種習知方法爲企圖藉感知電流波形，並依感測波形調 整驅動器頻率，使驅動器頻率與諧振頻率同步。此方法之缺點 爲電流波形及壓縮機在所有不同操作狀況下之電樞移動，兩者 間並非常數。 澳洲專利第687,294號揭示一種具有單側電樞驅動器之線 性運動冷煤壓縮機·由電樞所產生之馳返電動勢（BackEMF)用 爲調整驅動器頻率。其於壓1(1機向下行程時，給予電力以測出 並無電力作用在壓縮機向下行程（按，壓縮機僅在上衝程接通電 本纸張尺度適用中國囡家標準（CNS ) 格（210X 297公釐) 4^6189 A7 B7 五、發明説明（2 ) 力），此時馳返電動勢爲零。此一習知技術系統有多種缺點，舉 例而言’壓縮機及驅動器上之微電流非常高，其相較於雙側驅 動器爲上衝程電流之兩倍。再者，壓縮機效率無法增大，因動 力僅作用於單一方向，且壓縮機接通時間爲常數，而頻率則可 被調整’在整個所有範圍之工作狀況下，其效率無法提高。 發明內容 本發明目的即在提供一種藉由測量馬達電樞所產生馳返電 動勢’使其接近壓縮機諧振頻率以驅動線性馬達壓縮機之方法。 線性電機馬達如同其他其他電機馬達會依電樞移動速度之 比例產生馳返電動勢。在上下衝程端點電樞速度爲零。因此線 性馬達在衝程端點之馳返電動勢均爲零。 由於電動勢爲零發生於電樞移動方向之反向端點，即新衝 程循環之起點或驅動器波形之一半循環處。驅動器之頻率可加 以調整使電樞移動方向改變與驅動器波形由一極性至另一極性 之改變一致。 本發明目的之一即在提供一種線性馬達驅動器電路頻率控 制方法，用以驅控產生諧振頻率之冷煤壓縮機，上述方法包含 測量壓縮機衝程起點及終點馳返電動勢之磁性及極性，分析此 一測得之電動勢以決定驅動器頻率較高或較低於壓縮機諧振頻 率，並調整驅動器頻率至接近壓縮機諧振頻率。 經濟部中央標準局員工消費合作社印裝 --------ilt. (請先閱讀背面之注意事項再填寫本頁) 本發明之另一目的爲提供一種用以驅控產生諧振頻率冷煤 壓縮機線性馬達驅動器電路之方法，該方法包括監測壓縮機衝 程起點及終點之馳返電動勢極性。分析監測得之馳返電動勢， 並調整驅動器頻率至接近壓縮機諧振頻率。 本發明之進一目的爲提供一種具有諧振頻率冷煤壓縮機驅 動馬達之控制電路，該控制電路包含馬達於壓縮機衝程起點及/ 2 本紙悵尺度適用中国囡家標準（CNS)A4現格（210X 297公釐） 476189 A 7 __B7_ 五、發明説明（3 ) 或終點之馳返電動勢磁性及極性之測量裝置，用以分析電動勢 測量値以決定驅動器頻率高於或低於壓縮機諧振頻率之裝置， 以及用以調整驅動器頻率至接近壓縮機諧振頻率之裝置。 圖式摘要說明 第1圖係依本發明實施例使用於線性馬達壓縮機驅動器之 簡圖， 第2圖顯示第1圖驅動器四個金屬氧化物半導體場效電晶 體（MOSFET)每一 Qi、Q2、Q3、Q4之驅動信號圖， 第3圖爲第1圖驅動器電晶體Q2於驅動器低於壓縮機諧振 頻率之放電壓圖， 第4圖顯示Q2洩極電壓及第一圖驅動器頻率高於壓縮機諧 振頻率時，衝程起點所測得之馳返電動勢，並顯示衝程終點所 感知之馳返電動勢。 第5圖爲第1圖驅動器電晶體Q!，於驅動器頻率高於壓縮 機諧振頻率時之洩極電壓， 第6圖爲本發明驅動器電流圖表， 第7圖係驅動器頻率相等於壓縮機頻率之洩極電壓圖，以 及 經濟部中央標隼局員工消費合作社印製 (請先閲讀背面之注意事項再填寫本頁) 第8圖爲壓縮機於一定整操作循環之電壓與相關時間結合 圖。 本發明較佳窗施模式 示於第1圖之電壓驅動器10包括四個電晶體Qi、Q2、Q3、 Q4供將動力傳送至冷煤壓縮機11之壓縮機，電晶體Qi、Q2、 3 本紙伕尺度適用中囡囡家標準（CNS )八4说格（210X297公釐） 經濟部中央標準局員工消費合作社印^ 476189 A7 ____B7_ 五、發明説明（斗） Q3、Q4以控制電路12經線13、14、15、及16個別控制。此一 實施例中，以一微控制器作爲控制電路12之主要電路組件，該 微控制器具有一類比數位轉換器可感知類比電壓並將轉換成可 由控制器加以處理之數位信號。 電力係以正極輸入線19及負極輸入線20供給驅動器1〇， 線21接於線17及控制電路12間，其包括一感測電阻22。 電晶體Qi、Q2、Q3及Q4如第2圖所示以控制電路12頻率 控制連續ON及OFF，如第2圖所示之較高信號表示一電晶體 接通（即ON狀態），低位信號則表示一電晶體未接通（即OFF 狀態）。正極輸入線19及負極線20經由Q4及Q2於一方向，Q3 及Qi於另一方向之兩對電晶體傳送至壓縮機。 壓縮機之ON時間依據工作狀況，如環境溫度改變而有所 不同。ON時間之不同介於衝程循環35%及75%之間。位於線 23上之熱溫器（thermistor) 24係用以決定冷凍系統凝結器之 溫度。線23應用通過熱溫計（其作爲測量凝結器溫度）至控制 電路之壓降，而將其轉換成一數位信號供給控制電路內部軟體 之查出表（look-ιιρ table)以決定給予系統此一特殊的凝結器溫 度及冷凍系統預定操作並列計之合適的ON時間。舉例而言， 若壓縮諧振頻率爲50HZ，整個循環爲20毫秒則ON時間爲12 毫秒，OFF時間則爲8毫秒。該熱溫計可爲一電阻或其他各種 不同之感應器以量測工作狀況之改變。 驅動器之操作將先以業經衝程終點感知驅返電動勢調整驅 動器頻率加以敘述。在tl時間前電晶體（^2及Q4接通正極線至 線17，負極線則接至線18。電流由正極輸入線19經電晶體Q4 通過線1 7至壓縮機11，而線1 8則經Q2至負極線20。 在t!時間驅動器內部電流位於或接近於如第6圖所示之最 大量。此時Q4關閉，而Q2則保持ON狀態。由於壓縮機11感 應及爲此感應誘導之慣性，電流將連續流過同方向，但減小至 --------ΙΦ, (請先閲讀背面之注意事項再填寫本頁) 訂 線 本紙伕尺度適用中囷囷家標準（CNS ) 格（21〇X297公釐） 476189 經濟部中央標準局員工消費合作社印製 A7 B7 五、發明説明（^ ) 如第6圖所示。電流將由壓縮機11至電晶體Q2 (仍保持ON) 及Q1內部二極体而馳返壓縮機。如第6圖所示，此一電流逐漸 下降直至所有感應所生已貯於壓縮機線圖及電晶體Q1，Q2電 阻中之能量消散。 在所有能量消散後，電流將降至〇(於tia時間）。由tia時 間至t2時間，在壓縮機終端之僅有電壓爲馳返電動勢（因電樞 移動所產生）。若壓縮機於tia至t2間之諧振頻率低於驅動器頻 率，電樞將如4前般同一方向繼續移動。此意謂電樞所產生之 馳返電動勢與作用於時間^前之電壓同極性，即電晶體h流出 或線17上之電壓爲如第5圖所示之正極。 當電樞慢下來時，電壓朝零下降，而於電樞停止時爲〇値。 於時間t2之後，壓縮機頻率低於驅動器頻率時，電壓爲正値。 而在t2之前或於t2時，壓縮機頻率高於驅動器頻率時，線17 上之電壓爲負値。 線17上之電壓將由電阻22送至微控制器之類比數位轉換 器。該A/D轉換器將此電壓轉成數位信號送至控制電路之微控 制器，微控制器檢測此一信號，若其於t2時間爲正値，將減少 驅動器頻率。若其在t2時間爲負値，微控制器將增加驅動器頻 率。在此兩種情況之下，微控制器改變驅動器頻率，使其在t2 時間之信號（代表馳返電動勢）將盡可能接近〇値，以確使驅 動器頻率接近壓縮機諧振頻率。 同樣結果可由感知線1 8或Q2在t3時間之放電端送出信號 至微控制器加以達成。如第7圖所示此一實施例中，兩頻率非 常接近，而馳返電動勢於時間t3時爲0。 驅動器頻率亦可於衝程開始時感知馳返電動勢而加以調 整。於時間t2電晶體Q1爲打開，Q2則關閉。同時Q3及Q4保 持關閉。時間2代表新衝程循環或循環中點。 本纸张尺度適用中國國家標準（CNS ) A4说格（210 X 297公釐） (請先閲讀背面之注意事項再填寫本頁) 訂 線一 476189 Α7 Β7 經濟部中央標準局員工消費合作社印製 五、發明説明（6 ) 在此一衝程循環，壓縮機11將經由線18上之電晶體Q3及 Q4或電晶體Q2端供電而爲正電位。若壓縮機在時間t2諧振頻 率高於驅動器頻率，電樞將沿新循環之方向移動，此意謂馳返 電動勢如第3圖所示將於Q2洩極端產生正電位。 若壓縮機諧振頻率於t2時間低於驅動器頻率，電樞將沿前 一循環方向移動。因此，馳返電動勢將於線18或Q2洩極端如 第4圖所示般產生負電位。此信號將經由電阻22送至微控制器 並轉成數位信號。如前述狀況，微控制器將調整驅動器頻率， 使Q2洩極端在t2時間接近0。理想的是，如此將確保驅動器頻 率如第7圖所示般接近壓縮機諧振頻率。同樣的結果亦可經由 Qi洩極端在如第5圖所示壓縮機頻率低於驅動之t3時間時之信 號感知來達成。 經由上述可知，較佳實施例中提供一種諧振型式線性馬達 之同步驅動器，其馬達線圈在所提供之死點時間（dead time) 處於非負荷（unload)狀態，使馬達之馳返電動勢可加以監測。 壓縮電壓之結合如第8圖所示，其中： TD-死點時間（DEAD TIME) —無電壓作用於壓縮機使馳返電動 勢可加以觀測。 T0N-接通時間（ON TIME) —壓縮機以驅動器接通電力。A7 V. Description of the invention (I) Technical scope (please read the notes on the back before filling this page) The present invention relates to a linear motor motor, especially the linear motor frequency control of a cold coal compressor. _Back Dip Briefly, a cold coal compressor includes an armature installed between two springs to drive the piston of the cold coal compressor. The armature is reciprocated forward and backward by the compression spring driven by the coil winding. This linear motion compressor generates a natural resonance frequency (Resonant Frequency) due to the armature mass and spring tension. As the piston engages the armature, the resonance frequency will be affected by the load acting on the piston. In most applications, the load is not constant, so the resonance frequency of the compressor is also very high. To achieve higher frequencies, the linear motor should be driven at the resonance frequency of the compressor. That is, the frequency of the driver should be as close as possible to the resonance frequency of the linear motor compressor. There are many different existing technologies that attempt to synchronize the driver frequency with the compressor resonance frequency. One method is to measure the pressure on the high and low side of the compressor, and the driver adjusts based on these measured pressures. The disadvantage of this method is that it does not take into account the existing changes in the initial resonance frequency of the linear motor of the compressor caused by the manufacturing process of the linear motor compressor. Printed by the Staff Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. Another method is to attempt to adjust the driver frequency based on the sensed current waveform and synchronize the driver frequency with the resonant frequency. The disadvantage of this method is that the current waveform and the armature movement of the compressor under all different operating conditions are not constant between the two. Australian Patent No. 687,294 discloses a linear motion cold coal compressor with a one-sided armature driver. The back-EMF generated by the armature is used to adjust the frequency of the driver. When it presses 1 (downward stroke of 1 machine), it gives power to measure that there is no power acting on the down stroke of the compressor (press, the compressor is only turned on in the up stroke. The paper size applies the Chinese standard (CNS) ) Grid (210X 297 mm) 4 ^ 6189 A7 B7 V. Description of the invention (2) Force), at this time the electromotive force of the flyback is zero. This conventional technical system has a variety of disadvantages, for example, 'compressors and drives The micro current is very high, which is twice the up-stroke current compared to the double-sided driver. Moreover, the compressor efficiency cannot be increased because the power only acts in one direction, and the compressor on-time is constant, and the frequency Then it can be adjusted 'the efficiency cannot be improved in the whole range of working conditions. SUMMARY OF THE INVENTION The object of the present invention is to provide a method to measure the flyback electromotive force generated by the motor armature' to approach the resonance frequency of the compressor to drive linearity. Method of motor compressor. Linear motors, like other motors, generate flyback electromotive force in proportion to the speed of the armature movement. The armature speed is zero at the end of the up and down strokes. Therefore, linear motors The galvanic back electromotive force at the end of the stroke is zero. Because the electromotive force is zero, it occurs at the opposite end of the armature movement direction, that is, the beginning of a new stroke cycle or a half cycle of the driver waveform. The frequency of the driver can be adjusted to make the armature The change of the moving direction is consistent with the change of the driver waveform from one polarity to another. One of the purposes of the present invention is to provide a linear motor driver circuit frequency control method for driving a cold coal compressor that generates a resonance frequency. The above method includes Measure the magnetism and polarity of the electromotive force at the beginning and end of the compressor stroke, analyze the measured electromotive force to determine whether the drive frequency is higher or lower than the compressor resonance frequency, and adjust the drive frequency to be close to the compressor resonance frequency. Printed by the Consumer Standards Cooperative of the Central Bureau of Standards -------- ilt. (Please read the precautions on the back before filling out this page) Another object of the present invention is to provide a cold coal compression for driving and generating resonance frequency Of a linear motor drive circuit for a motor, the method comprising monitoring the galvanic back electromotive force at the start and end points of a compressor stroke Polarity. Analyze and monitor the back electromotive force and adjust the driver frequency close to the compressor resonance frequency. Another object of the present invention is to provide a control circuit for a cold coal compressor drive motor with a resonance frequency. The control circuit includes a motor in the compressor. The starting point of the stroke and / 2 This paper's standard is applicable to Chinese standard (CNS) A4 (210X 297 mm) 476189 A 7 __B7_ V. Description of the invention (3) or the end point of the electromagnetism and polarity measuring device The electromotive force measurement is analyzed to determine the frequency of the driver above or below the compressor resonance frequency, and the device to adjust the frequency of the driver close to the resonance frequency of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is used in accordance with an embodiment of the present invention. For the schematic diagram of the linear motor compressor driver, Figure 2 shows the driving signal diagrams for each Qi, Q2, Q3, and Q4 of the four metal-oxide-semiconductor field-effect transistors (MOSFETs) in Figure 1; Figure 3 is the first Figure 1 shows the voltage of the driver transistor Q2 when the driver is lower than the compressor resonance frequency. Figure 4 shows the drain voltage of Q2 and the driver of the first figure. When the frequency is higher than the compressor resonance frequency, the flyback electromotive force measured at the beginning of the stroke is displayed, and the flyback electromotive force perceived at the end of the stroke is displayed. Figure 5 is the driver transistor Q! Of Figure 1 when the driver frequency is higher than the resonant frequency of the compressor. Figure 6 is the current chart of the driver of the invention. Figure 7 is the driver frequency equal to the compressor frequency. Leakage voltage diagram, and printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling out this page). Figure 8 is a combination of the voltage and related time of the compressor during a certain entire operation cycle. The preferred window application mode of the present invention is shown in Figure 1. The voltage driver 10 includes four transistors Qi, Q2, Q3, and Q4 for transmitting power to the compressor of the cold coal compressor 11. The transistors Qi, Q2, and 3 are paper. The standard is applicable to China Standards (CNS) Standard 8 (210X297 mm). Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs ^ 476189 A7 ____B7_ V. Description of the invention (Battle) Q3, Q4 Control circuit 12 Warp 13, 14, 15, and 16 are individually controlled. In this embodiment, a microcontroller is used as the main circuit component of the control circuit 12, and the microcontroller has an analog-to-digital converter that can sense the analog voltage and convert it into a digital signal that can be processed by the controller. The electric power is supplied to the driver 10 through a positive input line 19 and a negative input line 20. The line 21 is connected between the line 17 and the control circuit 12, and includes a sensing resistor 22. Transistors Qi, Q2, Q3, and Q4 are continuously turned on and off at the frequency of the control circuit 12 as shown in Figure 2. The higher signal shown in Figure 2 indicates that a transistor is turned on (that is, the ON state). The low-level signal It means that a transistor is not turned on (that is, OFF state). The positive input line 19 and the negative line 20 are transmitted to the compressor through two pairs of transistors Q4 and Q2 in one direction and Q3 and Qi in the other direction. The compressor's ON time varies depending on the operating conditions, such as changes in ambient temperature. The ON time varies between 35% and 75% of the stroke cycle. A thermostat 24 on line 23 is used to determine the temperature of the condenser of the refrigeration system. Line 23 should use a thermometer (which measures the temperature of the condenser) to the control circuit, and convert it into a digital signal for the software's internal look-up table. Special condenser temperature and refrigeration system scheduled operation are juxtaposed with appropriate ON time. For example, if the compression resonance frequency is 50 Hz, the entire cycle is 20 ms, the ON time is 12 ms, and the OFF time is 8 ms. The thermometer can be a resistance or various other sensors to measure changes in working conditions. The operation of the driver will be described firstly by adjusting the frequency of the driver by sensing the return electromotive force at the end of the stroke. Before tl time, the transistor (^ 2 and Q4 are connected to the positive line to line 17, and the negative line is connected to line 18. The current is input from the positive input line 19 through the transistor Q4 through line 17 to compressor 11, and line 1 8 Then it passes Q2 to the negative line 20. At t! Time, the internal current of the driver is at or close to the maximum amount as shown in Figure 6. At this time, Q4 is turned off, and Q2 remains on. Because the compressor 11 is inductive and for this reason Induced inertia, the current will continue to flow in the same direction, but reduced to -------- IΦ, (please read the precautions on the back before filling this page) (CNS) grid (21 × 297 mm) 476189 Printed by A7 B7, Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs 5. Description of the invention (^) As shown in Figure 6. The current will flow from compressor 11 to transistor Q2 (still maintained ON) and the internal diode of Q1 return to the compressor. As shown in Figure 6, this current gradually decreases until all the energy generated by the induction has been stored in the compressor line diagram and the transistor Q1, Q2 resistors dissipated. After all energy is dissipated, the current will drop to 0 (at tia time). From tia time to t2 time, at The only voltage at the compressor terminal is the flyback electromotive force (generated by the armature movement). If the compressor's resonance frequency between tia and t2 is lower than the driver frequency, the armature will continue to move in the same direction as before 4 It is said that the flyback electromotive force generated by the armature is the same polarity as the voltage applied before time ^, that is, the voltage flowing out of the transistor h or the voltage on line 17 is the positive electrode as shown in Figure 5. When the armature is slowed down, the voltage is The voltage drops to zero when the armature stops. After time t2, when the compressor frequency is lower than the driver frequency, the voltage is positive. When before t2 or at t2, the compressor frequency is higher than the driver frequency. The voltage on line 17 is negative. The voltage on line 17 will be sent from resistor 22 to an analog digital converter such as a microcontroller. The A / D converter converts this voltage into a digital signal and sends it to the microcontroller of the control circuit. The microcontroller detects this signal. If it is positive at time t2, it will reduce the frequency of the driver. If it is negative at time t2, the microcontroller will increase the frequency of the driver. In both cases, the microcontroller Change the drive frequency so that The signal at time t2 (representing the flyback electromotive force) will be as close as possible to ensure that the driver frequency is close to the compressor resonance frequency. The same result can be sent to the microcontroller by the sensing line 18 or Q2 at the discharge terminal at time t3. As shown in Figure 7, in this embodiment, the two frequencies are very close, and the flyback electromotive force is 0 at time t3. The driver frequency can also be adjusted by sensing the flyback electromotive force at the beginning of the stroke. At time t2 Transistor Q1 is on, Q2 is off. At the same time, Q3 and Q4 remain off. Time 2 represents the new stroke cycle or midpoint of the cycle. This paper size applies the Chinese National Standard (CNS) A4 grid (210 X 297 mm) (Please Please read the precautions on the back before filling this page.) Thread 1 476189 Α7 Β7 Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 5. Description of the invention (6) In this one cycle, the compressor 11 will be powered by line 18 The crystals Q3 and Q4 or the transistor Q2 are powered and have a positive potential. If the compressor's resonance frequency is higher than the driver frequency at time t2, the armature will move in the direction of the new cycle, which means that the flyback electromotive force will generate a positive potential at the discharge terminal of Q2 as shown in Figure 3. If the compressor resonance frequency is lower than the driver frequency at time t2, the armature will move in the direction of the previous cycle. Therefore, the flyback electromotive force will generate a negative potential at line 18 or Q2 as shown in Figure 4. This signal is sent to the microcontroller via resistor 22 and converted into a digital signal. As before, the microcontroller will adjust the driver frequency so that the Q2 leakage terminal approaches zero at time t2. Ideally, this will ensure that the drive frequency is as close to the compressor resonance frequency as shown in Figure 7. The same result can also be achieved through the signal perception of Qi leakage terminal when the compressor frequency is lower than the time t3 of the drive as shown in Figure 5. It can be known from the above that the preferred embodiment provides a synchronous drive of a resonance type linear motor. The motor coil is in an unload state at the dead time provided, so that the motor's galvanic back electromotive force can be monitored. . The combination of the compression voltage is shown in Figure 8, where: TD-DEAD TIME—No voltage is applied to the compressor so that the flyback electromotive force can be observed. T0N-ON TIME—The compressor is powered on by the drive.
T-半循環時間=T0N + 2Td f=頻率= 1/2T 若馳返電動勢於時間Τ爲0左右時之壓縮機諧振頻率。 因驅動器頻率之調整，於驅動器極性由一側改變時，馬達 之馳返電動勢接近〇，亦即，同一時間電樞移動亦接近0，電樞 本紙张尺度適用中國固家標準（CNS )六4说格（210Χ29*?公釐） (請先閲讀背面之注意事項再填寫本頁) 訂 線 476189 A7 B7 五、發明説明（1) 在接近驅動器由一側至另側改變波形’使驅動器頻率接近壓縮 機諧振頻率之此一時間改變方向。. 如上述，馳返電動勢之磁性用以指示其操作頻率與諧振頻 率之移型狀態（out of Phrase)程度’控制電路可於其修正動作 前容許少許量馳返電動勢存在。 舉例而言，驅動頻率變換前正負300mv之偏差爲可接受之 範圍。據此，300mv磁性係使用爲其界限。 可瞭解的是，如上述或圖示之波形爲壓縮機驅動波形’其 可使用於電機驅動器之不同位置而不脫離本案之精神及範疇。 齑挙k利用性 本發明之頻率控制可運用於驅動一線性運動冷煤壓縮機之 線性電機馬達。 (請先閲讀背面之注意事項再填寫本頁) 訂 線 經濟部中央標準局員工消費合作社印製 本紙張尺度逍用中囷國家標隼（CNS) A4说格（210X297公釐）T-half cycle time = T0N + 2Td f = frequency = 1 / 2T If the flyback electromotive force is around the time T of the compressor resonance frequency. Due to the adjustment of the driver frequency, when the polarity of the driver changes from one side, the electromotive force of the motor is close to 0, that is, the armature movement is also close to 0 at the same time. Grid (210 × 29 *? Mm) (Please read the precautions on the back before filling in this page) 476189 A7 B7 V. Description of the invention (1) Change the waveform near the driver from one side to the other to make the driver frequency close The compressor resonance frequency changes direction at this time. As mentioned above, the magnetism of the flyback electromotive force is used to indicate the degree of out of phase of its operating frequency and resonance frequency. The control circuit can allow a small amount of flyback electromotive force to exist before its corrective action. For example, a deviation of plus or minus 300mv before the drive frequency conversion is an acceptable range. Accordingly, the 300 mv magnetic system is used as its limit. It can be understood that the waveforms as described above or illustrated are compressor driving waveforms', which can be used in different positions of the motor driver without departing from the spirit and scope of the present case.利用 k availability The frequency control of the present invention can be used to drive a linear motor of a linear motion cold coal compressor. (Please read the precautions on the back before filling out this page) Orders Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs This paper size is not used in China National Standard (CNS) A4 (210X297 mm)