Current Specifications of DC Cooling Fans You Need To Know
Demystifying Power Supply Requirements for DC Fans: From Nominal to Startup Currents
When designing a system, it’s crucial to know the power supply requirements, particularly the worst-case current rating for the DC fans. This article provides an in-depth understanding of what factors need to be taken into consideration.
What is the Nominal Rated Current?
All DC fan manufacturers provide a nominal rated current, which is based on the fan operating at full speed in an open-air test bench condition. For instance, one of our models shown below has a nominal current rating of 3A at 100% PWM duty cycle on an open test bench.
However, this doesn’t represent the worst-case maximum current value. DC fans, being inductive loads, have a startup current (not to be confused with inrush current) that must be factored in.
Inrush Current
Inrush current is a brief current spike that occurs when power is applied to the fan to charge up all the components (primarily capacitors) on the PC board. In the graph below, we see an Imax of 6.5 A but only for a brief time of <20μs. This short spike generally has a minimal impact on the power supply supporting the fan and can often be disregarded.
Startup Current
On the other hand, the startup current lasts much longer as it’s needed to overcome the inertia of the fan’s rotor when first powered up. If the fan doesn’t receive the full startup current, it will fail to reach maximum speed and will shut down the motor. Below, we see an Imax startup current of 9.25A for almost 500ms. This has a greater impact on the power demanded by your power supply and must be considered.
The startup current issue is compounded if you have multiple fans turning on simultaneously, requiring a much higher rated power supply. For example, for a two-fan system, if both fans were turned on at the same time, they would require 9.25Ax2=18.5A for 500ms. One way to mitigate this issue and use a smaller rated power supply is to stagger or delay powering up the fans so that the second fan powers up after the first fan has reached full speed. This would then only require 3A+9.25A=12.25A for 500ms and then be reduced to 3Ax2=6A once both fans reached full speed.
Conclusion
In conclusion, the published nominal current rating of the fan is based on operating at full speed and measured under open-air test bench conditions. The inrush current occurs when power is applied to the fan to charge up all the components and is a very short spike.
The start-up current for all DC Cooling Fans must be considered to ensure your power supply is rated high enough to handle the current.
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SANYO DENKI 风扇选型表
SANYO DENKI 提供风扇选型，包含AC风扇、DC风扇、ACDC风扇，扇框尺寸：36mm~270mm，扇框厚度：10mm~119mm，扇框材质为铝或树脂，电压包含5v~240v，转速包含1500min-1~38000min-1，风量包含3.2CFM~1112CFM，噪音包含16dB(A)~83dB(A)。
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产品型号
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品类
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风扇特性
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扇框尺寸(mm)
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扇框厚度(mm)
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扇框材质
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额定电圧（V）
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额定电流(A)
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额定转速(min-1)
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最大风量(CFM)
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最大静圧(inchH2O)
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噪音(dB(A))
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最大风量(m³/min)
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最大静圧(Pa)
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使用温度范围(˚C)
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期待寿命(h)
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传感器种类
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是否带PWM调速
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是否带加强筋
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重量(g)
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9HV3612P3K001
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DC风扇
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直流冷却风扇
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36mm
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28mm
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树脂
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12V
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1.75A
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32500min-1
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25.4CFM
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5.62inchH2O
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67dB(A)
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0.72m³/min
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1400Pa
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-20℃～+60℃
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30000h/60℃（53000h/40℃）
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脉冲信号
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是
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是
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53g
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选型表 - SANYO DENKI 立即选型
SANYO DENKI（山洋电气）SAN Ace冷却系统产品选型指南
目录- Cooling Systems Products DC Fan Counter Rotating Fan Reversible Flow Fan Splash Proof Fan Splash Proof Blower Oil Proof Fan Long Life Fan Wide Temperature Range Fan G Proof Fan Centrifugal Fan Blower ACDC Fan AC Fan Option
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TYPE,9HV0912P4G001,9WV0924P1H001,9LG1224P1G001,109BD24HC2,9W2TM48P4G001,9S0924F401,109S025UL,9TJ TYPE,109E1748C501,9G0912A201,9RF0912P1H001,9WP1212H101,9CRA0312P4K03,109BD12HC2,9GV1248P4J01,109S484,9W2TP TYPE,109S488,9ADTV11P0G001,109S487,109S486,109S485,109S008,109S405UL,9HVA0848P1G601,109S006,9TGA24P0H001,109S005,9BMB TYPE,9GT0924P1M001,9ADW1TS,9ADW1TU,9GV TYPE,109BM24GC2-1,9WF,9WG,9ADW1TV11P0G001,9RA0648P4J001,9BMB12P2K01,9B1W2TP TYPE,9ADW1TV,9WL,9GV1448P1G001,9WP,109E5724C501,9W1TG TYPE,9WV,9RA1224P1K001,9ADB1TS11P0G001,9W2TGA,9RA0624P4J001,9ADTS11P0G001,9BMC TYPE,9GV1212P4G01,109-319E,9GV1424P1G001,9PC8045D-V101,109-047UL,9LG TYPE,9TGA48P0G001,9HV3612P3K001,9WPA0424P3G001,9GL1212G101,9ADB1TS,9W2TN24P1H001,9RA0924P4G001,9TN TYPE,9ADW1TS TYPE,9BJ TYPE,109-151,109-150,109-153,109-154,9LG0424P3G001,9B1TP TYPE,9CRA0948P0G601,9WPA0412P6G001,109S475UL,9WFA0624G6001,9WFA0424G6001,9WP1248H101,9ADAW TYPE,9W1TN,9W1TM,9WG1212G101-E,9G0912G101,9G0624P4S001,9W1TG,9PC8045D-T101,9CRJ0412P5J001,9RA1248P1K001,9GL1224G101,9RA1448P1G001,9ADW1601P5HT03,9GP1248P1G001,9GP5724P5H001,109P0405H3013,109-049E,109-049H,109S474UL,109-1128,9WL1412P1A001,9HVA TYPE,9TGA,9LG0924P4J001,9E TYPE,9LG1424P1A001,9CRA0612P0G001,9W1TN TYPE,9WPA0824P4G001,9GA0612P7G01,9GA0812P1G61,9W2TJ,9W2TN,9W2TM,9PC8045D-T001,109E1348G101,9ADTU11P0G001,9ADTU23P0G001,9W2TS,109L1748H501,9W2TP,9W1TN48P1H01,9WPA0612P4G001,9G0948G101,9GV0848P1G03,9GA TYPE,9W1TJ24P0H61,9GA0612P6G001,109-1147,9TM24P4H01,109-033UL,9GL1248G101,9WF0824S401,9ADB1TS TYPE,9WV TYPE,9BMB24P2K01,109S078UL,9ADA TYPE,9ADW,9ADAW1201P1H001,109-180,9TS TYPE,9CRE0412P5J03,9TG48P0G01,109-183,9PC8045D-R001,9BC TYPE,9ADTV TYPE,9RFA,109-044UL,109-059,9WPA,9RF0924P1H001,9BMC12P2G001,9ADTV23P0G001,9GA0848P2S001,9CRH TYPE,9W2TS TYPE,9TG TYPE,9BFB,9ADA,9LG0812P4J001,109S472UL,9GA0848P1S61,9GV0948P1H03,9SG TYPE,109E1724C501,9RA0848P1G001,9LG0648P4S001,109E4724H401,9GA0824P6G001,9GV1512H501,9LG1424P5G001,9HV5748P5G001,9CRV0412P5J201,9GA0912P1H03,9W2TN TYPE,109-139E,9AT2560A-000□,109-139H,109S010UL,109P0424H701,9B1TP,9B1TS,9CT1-001,109-043UL,9LG0912P1H001,9RA1212P1K001,9L0412J301,9WF1224H101,9CT1-002,9CRA TYPE,109S408UL,9GV1224P1J01,109-019E,9B1TS48P0G001,109-019K,9HVA,9AT2560C-000□,9WG1248G101-E,109-619H,9AD1201H12,9ADB1TS23P0G001,109-619E,9GA0924P4J03,9W2TJ48P0H001,9GP5748P5G001,9G0948A201,9CT1-P,9GT1212P1S001,109P0505M701,109BJ24HC2,9W2TJ TYPE,9CT1-T,9RA1412P1G001,9GA0648P1K03,9WFA TYPE,9PC8666X-S001,109S072UL,9AD,9GT0912P1M001,9WL0412P3J001,9B1W2TS,9TD TYPE,109E1712K501,9B1W2TP,9HV0612P1J001,9W1TJ48P0H61,109S008UL,9HVA0412P3J001,9RA0824P1G001,109BJ12HC2,9B1TS TYPE,9HV TYPE,9ADTS TYPE,9GA0912P4J03,9GX3612P3K001,9GA0624P1J03,9GV0812P1G03,9ADB1W1TS23P0H001,9BC,9BD,9CRLA TYPE,9GV1212P1J01,9BG,9CRE TYPE,9ADW1TV TYPE,9GA0948P1H03,9BJ,9GV2048P0G201,9BM,9GA0512P7G001,9GA0612P1J03,109L1724H501,9BM TYPE,9GA1224P4G001,109-210,109S091,109E1324G101,9SX TYPE,109S095,109S094,109S093,109S092,109E4712M401,109L5724H501,9ADW1601P5H003,109S096,9PC8666X-S101,9CRA0812P8G001,109E5712K501,109S478UL,109-719H,9CRL TYPE,9W1TM48P4G01,9RFA1324P3G001,9BMB,9BMC,9BFB12P2H003,9CR,109-041UL,9B1TP24P0H001,9GT0824P4S001,9PC8045D-R101,9TN24P1H01,109P0412H701,109-313,109-314,9WL1448P1A001,109-311,109-312,9LG1448P1A001,9GT0412P3J001,9GT0612P4G001,9GT TYPE,9SG5748P5G01,9B1W2TP24P0H001,9AD5701P5H003,9G TYPE,9W2TP48P0S001,9RA0812P4G001,109E4748S401,9WPA TYPE,9W2TJ24P0H001,9G0924A201,9ADW1TS23P0H001,9EC,9WL1424P1A001,9LG0612P4S001,109S074UL,9LG0824P4J001,9CRLA,9TP48P0G001,9AD1601P5HT03,9HVB0812P1G001,9WL0612P4S001,9WV1224P1J601,109-040UL,9GA1248P4G001,9HV1224P1A001,109-213,9WG TYPE,9CRE0812P8G001,9RA0912P4G001,9CR TYPE,9WG1224G101-E,9WP1224H101,9WV1248P1J001,9S TYPE,9CRL0812P8G001,9CRB,9GP TYPE,9GA0424P6G001,9CRA,9TJ24P0H61,9CRE,109-371,109-130,109-372,9WL0824P4J001,9WF0624H401,109-133,9TN48P1H01,109-373,109-374,9GA,9GA0812P4J001,9WP0412H6001,9ADW1TU23P0G001,9HV0948P1G001,9WPA0624P4G001,109S075UL,9ADTS,9B1W2TS48P0S001,9ADTU,9GL,109P0405H701,9ADTV,9GA0812P2S001,9GA0924P1H01,9GP,9LG0924P1H001,9GT,9GV,9WPA0924P4G001,9WL0924P1H001,9L
109BC12FA7-1型号索引/安全标准列表-直流风机标准和认证
描述- 本资料详细列出了多种直流风扇的型号、规格、认证标准和适用传感器。包括无传感器、脉冲传感器、锁传感器和PWM控制功能等选项。资料中提供了风扇的尺寸、认证状态和标准信息，并对低速传感器的购买方式进行了说明。
型号- 109P0524H7D01,9G0824P1G04,9GV0612P1G03,9G0948H2021,9G0924M2D011,9GA0412P3M011,109P0812M7D01,109R0812S4D011,9HV0812G10021,9GA0924J4021,9LG0612H4001,9WL0812G4D001,9G1212F4D01,9LG0612H4002,9GA0524P7G001,9LG0824S4002,9LG0824S4001,9G1212A4021,9A0924H401,9A0924H402,9G0948H2011,9HV0812G10011,9A0612H4011,9GL1248F102,9GA0624M6002,109P0424F3023,9GA0624M6001,9GE0412P3J03,9GL1248F101,9GV0912P1G031,9A0824S4011,109R0805M4011,9LG0912F4002,9LG0912F4001,9GV1224P1J011,9A0924S402,9A0924S401,9AH0812P4G04,9GA0924J4011,9WL1412A5D001,9S0612F402,9S0612F401,9G1212A4011,9WL0812P4H001,9GA0412P3K01,9GA0924H4D011,9WS0924F402,9CRD0412P5M03,9WL0948P1H601,9GA0624P1K031,9WP0848S4D011,109P0424F3013,9WS0924F401,9GA0812G4001,9G0812P1K081,9GA0812G4002,9GA0924P4S03,9A0824S4021,9GP1224P1G001,9G1224F4D011,9GA0924M401,109P0824M6D01,9GA0924M402,9GV1448P1S001,9A0612G4D011,9G1248P1G041,9GA0824P7G001,109R0812G4D01,9A0624F4D01,9A0912M402,9GA0412M3D01,9A0912M401,109P1412M10,9A0612M4D01,109L1724M501,109L1724M502,9GV0612P1G031,9GV1448P1H001,109R0624H4D011,9GV1248P4G01,9G1224E1D01,9GA0912P4J031,9GA0412H301,9GA0412H302,9GV1248J1021,9GV1524M502,9GA0412H3021,9GV1524M501,9WP0612G4D01,9GA0612J1011,9A0812G401,9WV0924P1H001,109P0412M601,9A0824M401,9A0824M402,9S0612P4M01,109P0412M602,9G1224G4011,109P0624H6D01,9G1248F1D01,9GV1248J1011,109P0624W6D01,9G1248F101,9GA0412H3011,109R0648J401,109R0648J402,9LG0912P1F001,9WP1212H101,9WP1212H102,109P0824M602,9G1248M4D01,9GA0612J1021,109P0824M601,9A0812G402,9GV1224G401,9GA0912F4D011,9GV1224G402,109P0505M7D01,9G0612H4D0011,9WL0612J4D001,109P0412M3013,9G0912S2D01,9GT0924P1M001,9G0612S40021,9G1224G4021,9G1224G1D011,9GA0824P4G0011,9A0912H4021,9A0612H4021,9GA0424J3D001,9WP0824H4D011,9HVA0812P1G001,109P0612H7D01,9WP0924H4011,9G0912P1G03,9GV0812G1021,9G1212G1011,9GA0924W4021,9WP0624H4011,109P0412M3023,109R0624G4011,9G1224M1021,9GL1212F1D01,9A0912H4011,9GA0912G402,9A0812M4D011,9LG0812P4G001,9GA0912G401,9WG1212E101-E,109P0605M702,109P0605M701,9G1212G1021,9GV0812G1011,9LG1224S1D001,9LG1412P1H001,109P0405M602,9G1212F101,9G1212F102,9G1248G401,9WP0624H4021,9G1248G402,109P0405M601,9GA0924W4011,109R0624G4021,9G1224M1011,9GA0612P1H031,9WL0924M4001,9WL0924M4002,109R0648H4011,109E4724F401,9GV0848G102,109P0512M7D01,9GV0412K301,9GV0412K302,109R0605H4021,9S0912P4F011,109P1348H1D01,9G0648P4S0011,109P0624S702,9LG0824F4D001,9CRA0948P0G601,9GA0812P1H61,9LG1424P5S001,109R0824F401,9GA0924H4011,9LG1412A5001,109P0624S701,109R0824F402,9LG1412A5002,9G1224A4D01,109P0612M702,109P0612M701,9GA0712P1H0011,9G0924M202,9L0412M3D01,9S0812H4011,9WP1248H102,9WP1248H101,9WL1412P1M001,9WG1248F102-E,9WS0824M4D01,109R0648H4021,9WP1212L101,9G0612S4002,9GA0612P,9CRE0412J502,9G0948G1D01,109P0624H701,109P0624H702,9A0624S4D01,9G0612S4001,109P1348S1D01,9GV1224G4021,9HV1248H1002,9A0824F402,9HV1248H1001,109P0412K3023,9A0824F401,9GA0824L2002,9GA0924H4021,9GA0824L2001,9A0624H4D01,9WG1248M102-E,9GA0612L9001,109R0824M4D01,9GA0612L9002,9GA0412K3D01,9GA0612H1021,109R0824G4D011,109P0612B702,9GA0524M7002,9S0812M4D01,9GA0812S2001,9GV1524M5011,9GA0524M7001,109L5748M502,109L5748M501,109P0612B701,9BMB24P2H01,9G1248F102,9G0848G1021,9BD24FA6-1,9GA0812H1621,9GV1212J1D01,109P0412K3013,9GT0612G4D001,9GA0924M4D01,9GT0912J4002,9LG0912S4001,9G0948H102,9G0948H2D011,9GA0412H3D011,9LG0912S4002,9G0948H101,9EC2024H0D01,9LG0924L4002,9WG1212G102-E,9LG0924L4001,9S0912M402,9GA0612H1011,9S0912M401,9GT0912J4001,9GV1212P1G011,9GA0612L9D001,9GV1224P1H01,109E4724F402,9GV0848G101,9WP0624G401,9PH0412P3J013,109R0605H4011,9WP0624G402,9GV0624P1G031,9G1212H4D01,9GA0812H1611,9G0924G1D011,9GA0312K3001,9GA0424H6001,9GA0424H6002,9WP0812H4D01,9G0848G1011,9LG1424M5002,9A0824F4021,9LG1424M5001,9WP0924F402,9WP0924F401,9GV0312G3011,9GV0812G102,9LG0824M4D001,109R0612P4J03,9GV0312K3D011,9GV0812G101,9GA0612P6G001,9G0812K1021,9G0812P1H03,9G1248H4021,9GA0612J102,9GA0612J101,9GV0412G3D01,9LG1448M1D001,9G0912H101,9GA0612P7H01,9G0912H102,9LG0924P4H001,9B1TS48P0H001,9WP0812H4D011,109R0848K4021,9WP0924F4021,9A0824M4D01,109R0848K402,9A0824H4D011,109R0848K401,109P0424H602,9LG1448H5002,9LG1448H5001,9LG0912L4D001,9LG0924P1F001,109P0424H601,9A0824F4D011,9A0924F4D01,9CRE0412P5J03,9G1224M4D011,9CRA0312K402,109P0612M6D01,9G0812K1011,109R0612S4D01,9G1224F402,9G1224F401,9A0812M4021,9GA0612M6D001,9WG1248E1D01-E,9G0948A2D011,109R0848K4011,109P0424G3D013,9A0912G4D011,9GV0812P1M03,9GV0812P1M031,9LG0924P4S001,9GV0948P1H03,9GA0412H7002,9GA0412H7001,9A0912M4D01,109R0824H4021,9A0912F4011,109P0405H6D01,109R0612P4J061,9A0812M4011,9G0624H1D01,9WG1224E101-E,109R0805M4021,9WP0624J4011,9CRA0412J402,9CRA0412J401,9LG1212M1002,9LG1224F1001,9GA0512A7002,9GV0948P1F031,9GA0512A7001,9G1224E102,9G1224E101,9GV0312G3021,9LG1212M1001,109R0824H4011,9A0912F4021,9GV1248H402,9G1248H4011,9GV1248H401,9GL1224E102,9GL1224E101,9G1224H4D011,9WS0924M402,9GA1224P4G0011,9WS0924M401,9A0824M4D011,9GA0924F401,9LG0824P4G001,9LG1224F1002,9GA0924F402,9S0612M401,9WP0924F4011,9A0824F4011,9S0612M402,9GA0924P4J031,109R0812S401,9LG0912S4D001,109R0812S402,9GA1248P4S001,9WL1448M1001,9G0948S2021,9G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SAN ACE 120W 9WV型120×120×38 mm防溅风扇
型号- 9WV1212P1J001,9WV1224P1H001,9WV,9WV TYPE,9WV1224P1J601,9WV1248P1J001
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SAN ACE 120AD 9AD型ACDC风扇
描述- 本资料介绍了9AD型号交流风扇的特性、规格和应用。该风扇具有高静压和高风量，长寿命设计，宽电压范围，低噪音节能等特点。资料提供了详细的规格参数，包括额定电压、工作电压范围、频率、PWM占空比、额定电流、功率、转速、最大空气流量、最大静压、声级、操作温度和预期使用寿命等。
型号- 9AD1201H4002,9AD TYPE,9AD1201P4H001,109S085,9AD1201L4002,9AD,9AD1201M4002
SANYO DENKI Launches 80×80×38mm DC Fan with the Lowest Noise in the Industry
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使用FloTHERM和Smart CFD软件，提供前期热仿真模拟、结构设计调整建议、中期样品测试和后期生产供应的一站式服务，热仿真技术团队专业指导。
实验室地址： 深圳 提交需求>
可定制DC风扇的尺寸范围：15mm~225mm；转速：≤16500 RPM；噪音：≥10.4dB，还可定制厚度、电压、风量、风压等参数，符合 RoHS 标准。
最小起订量： 1 提交需求>
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