Easy Guide on Open Loop vs. Closed Loop Control in DC Cooling Fans
Closed loop fan control has often been associated with external controllers to modify a DC fan’s performance. However, many SANYO DENKI Fans utilize an internal closed loop speed control to enhance performance.
This brief article will explain the differences between open and closed loop control and how to tell what type of loop control the fan model has.
Open Loop Control
Open loop control is basically just a free running motor and is the simplest design. It has no internal feedback circuitry and so the speed (RPM) can be affected by changes in pressure or temperature. Most of our older fan models are open loop controlled.
In order to tell if a DC fan is open loop controlled, look at the Speed vs PWM duty cycle graph provided in the data sheet. As you can see below, the nominal speed (black line) is not linear over the PWM duty cycle range.
Advantage: Lowest cost because there is no feedback circuitry.
Disadvantage: Will not self-correct the RPMs when conditions change.
Closed Loop Control
Over the last decade, many of our new fan models have closed loop control which keeps the speed (RPMs) constant regardless of temperature or back pressure variations. This is accomplished by adding a feedback circuit to the motor control via an internal tachometer signal so that the feedback circuit automatically makes corrections to bring the speed back to nominal.
For example, below is a Speed vs PWM duty cycle graph showing a fan with closed loop control. As you can see, the RPMs are linear over the PWM duty cycle range and will autocorrect the speed up to +/- 5% of the nominal value over the duty cycle range. This percentage can vary based on the fan model.
Advantage: Will autocorrect the RPMs based on external changes to maintain a constant airflow and thus provides the desired temperature in a system.
Disadvantage: Adds a small cost increase since additional internal feedback circuitry is needed.
In closing, DC fans with closed loop control features are a great way to maintain constant fan performance over the PWM duty cycle even when changes in system pressure or temperature occur.
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本文由玄子转载自SANYO DENKI Official Website，原文标题为:Easy Guide on Open Loop vs. Closed Loop Control in DC Cooling Fans，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。
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型号- 9BFB TYPE,9GV0612P1G03,109-1066,9G0948H2021,109-1065,9G0924M2D011,9GA0412P3M011,109-1068,109-1069,9GA0924J4021,109BM12GC2-1,9WL0812G4D001,ST1-109S429UL-20,9WPA0624M40011,9RA0612M40021,109BM24HD2-1,9RA1248P4G001,9WPA0612P4H0011,9SG5748H501,9RA1424S1001,9RA,9G0948H2011,9RF,9GL1248F102,9GA0624M6002,9GE0412P3J03,9GA0624M6001,9GL1248F101,109-1073,9WPA0624M40021,9GV0824G1D01,9GV1224P1J011,9GA0924J4011,9WL1412A5D001,9RA0824P4G001,9RA0912P4G0011,9RA1212H1001,9WL0812P4H001,9RA1212H1002,9RA0912G4D0011,9SG,9WL0948P1H601,109-1080,109-1081,9GA0812G4001,9GA0812G4002,9SX,ST1-109S484-30,9GA0824P7G001,9W2TN48P1H001,9TD,9TG,9TJ,9AD1601H5H001,9TM,109L1724M501,9TN,109L1724M502,9TP,9GV0612P1G031,9RA0612M40011,9TS,9GV1248P4G01,9GA0912P4J031,ST1-109S484-20,9GA0412H301,9GA0412H302,9GV1248J1021,9WL1448M5002,9WL1448M5001,9RA0624M4001,9RA0624M4002,9RA0612F40011,9GA0612J1011,9WPA0924F4002,9WPA0924F4001,ST1-109S024UL,9RA0848H1001,9RA0848H1002,9S0612P4M01,9BFB24H2002,9RA1212G4D001,9GV1248J1011,9GA0612J1021,9RA0612F40021,9GV1224G401,9GV1224G402,9RA1448S10011,9RA1224H4D0011,109P0505M7D01,109S484,9RA0612S4D001,109S488,109S487,109S486,109S485,109P0412M3013,9GA0312H30011,9GT0924P1M001,9G0612S40021,9WF,109BC12FA7-1,9GA0824P4G0011,9WG,9B1W2TP 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TYPE,9BD24HA6-1,9RA0924F4D0011,109S425UL-30,109P0405H702,9GA0424P6G001,9TJ24P0H61,9WPA0812G4001,9WPA0812G4002,9GL1224H102,109S425UL-20,9GL1224H101,109S075UL,109S472UL-20,109P0405H701,9LG1224A1D001,9G0912P2A01,9HV0924P1G001,9RA0612G4001,9RA0612G4002,9RA1248G40011,109S472UL-30,9G0612H4002,109E4748H4D01,9ADW1TU11P0G001,9RA1412M10011,9B1TP48P0G001,9WL0924H1D001,9LG0912H4002,109BD12MA2,9RA0624H40011,9GA0824P6M001,9LG1412P1A001,9S0812L4011,9HV0924P1G0011,9LG0912H4001,9G0612P4H001,9G0612P4S0011,109BD24MA2,9WG1212G1D01-E,ST1-109S072UL,9RA0812G1D001,9WL1424P1M001,ST1-109-644-30,9LG0912P4S001,9GV1248P4H011,9RA0848G40011,109-720H,9G0612P4S001,9GV0848G1011,9GA0812G4D001,9GA0924P4G03,9WL0912P4J001,9LG0912P4H001,9LG0824F4002,9LG0824F4001,109BD12MD2,9S0612H4D011,489-1635-L10,9GA0824A20011,109S491,9GV0812P1F031,ST1-109S472UL-20,9GV1412H1002,109S495,109-603,109S494,109-604,109S493,109-601,109S492,109-602,9RA0848G40021,109-721H,9WG1212H1D01-E,9GA0412P3G01,109S496,9RA0812G4D001,9GA0624H6D001,9RA1212P4H003,109BD12MC2,9GA0824A20021,9WPA0824G4D001,9WFA0624P6G001,9RA1448M1D0011,ST1-109S472UL-30,9S0924L401,9S0924L402,109-722H,109BM12P2M01,9WL0924H4D001,9GA0924H101,9GA0924H102,9GA0524G7002,9GV1212G1011,9RA0624J4D0011,9GA0524G7001,ST1-109S496-30,9RA1448S1D0011,109-620,ST1-109-374-30,9LG1212F1D001,109L5712H5D01,9GA0412P6H001,9WP1248M1D01,9GA0312G3D001,9WP1248H1021,AT2560A-000□,9RA1224P4G001,9WL0412G3D001,489-1635-L21,109E1724H502,109E1724H501,
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型号- 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型号- 9B1TS,9B1TS48P0H001,9B1TS TYPE,9B1TS48P0G001
A0054942 Change the resin material of Impeller
型号- 9CRA0824P8G001,109-U0053-01,9GA0312E3002,9GA0312P3K0031,9GA0312E3001,9GA0712P1G0051,109-U0042-01,SAN ACE 60,9GA0312P3G0011,9GA0312P3K0041,9GA0312K3D0011,9GA0312P3G004-2,9CRA0612P6K001-2,9CRA0812P8G009,9CRA0812P8G006,9GA0312P3K0051,9CRA0812P8G008,9CRA0812P8G007,109-U0060-01,9CRA0812P8G001,9CRA0812P8G003,9GA0312P3J0011,109-U0017-01,9GA0712P1HD003,9CRA0812G8001,SAN ACE 38,9GA0312P3K0061,109-U0023-01,9CRA0612P6K010,9CRA0612P6K011,9CRA0612P6K014,9CRA0612P6K015,9CRA0612P6K013,9GA0312P3K010,9GA0312P3K011,9GA0312P3K001,109-U0028-01,9GA0312P3K003,9GA0312P3K004,9GA0312P3K005,9CRA0812P8G028,9GA0312P3K006,9CRA0812P8G027,9GA0312P3K007,9GA0312P3K008,9GA0312P3K009,9CRA0612P6K018,9CRA0812P8G024,9CRA0612P6K016,9CRA0812P8G026,9CRA0612P6K017,9CRA0812P8G025,9CRA0812P8G020,9CRA0812P8G022,9CRA0812P8G021,9CRA0648P0G003,9CRA0812P8G017,9CRA0812P8G016,9CRA0812P8G019,9CRA0812P8G018,9CRE0812P8G001,9CRA0812P8G012,9CRA0812P8G015,9GA0312J3D001,9GA0312H30011,9CRA0812P8G010,109-U0016-01,9CRA0812P8G040,9CRA,9CRE,9GA0312K3D001,9GA0312K3D003,9GA0312P3K0011,9GA0312P3J011,9GA,9GA0312E3D001,9CRA0812P8G049,9CRA0812P8G046,9CRA0812P8G045,9CRA0812P8G048,9CRA0812P8G042,9CRA0812P8G041,9CRA0812P8G044,9CRA0812P8G043,9GA0312P3J009,9GA0312P3J008,9GA0312P3J007,9GA0312P3J006,9GA0312P3J005,9GA0312P3J004,9GA0312P3J003,9GA0312P3J001,9GA0312P3J010,9GA0312J3001,9GA0312J3002,9GA0312J3003,9GA0312J3004,9CRA0812P8G039,9GA0312J3005,9CRA0812P8G038,9GA0312J3006,9CRA0612P6G001,9CRA0812P8G034,9CRA0812P8G037,9CRA0812P8G036,9CRA0812P8G031,9CRA0812P8G030,9CRA0812P8H001,9CRA0812P8G032,9GA0712P1G001,9GA0312P3G007,9CRA0612P6J001,9GA0312P3G008,9GA0312P3G005,9GA0312P3G006,9GA0312P3G003,9GA0712P1G007,9GA0312P3G004,9GA0712P1G008,109-U0010-01,9GA0312P3G001,9GA0712P1G009,9GA0712P1G003,9GA0712P1G004,9GA0712P1G005,9GA0712P1G006,9CRA0612P6J008,9GA0712P1H0011,109-U0067-01,9GA0312G3001,9CRA0612P0G009,9CRA0612P0G008,9CRA0612P0G007,9CRA0848P8A006,9CRA0848P8A005,9CRA0848P8A004,9CRA0612P0G001,9CRA0612P0G006,9CRA0612P0G005,109-U0026-01,9CRA0612P0G004,9CRA0612P0G003,9CRA0824G8D001,9CRA0612P6K003,9CRA0612P6K004,9CRA0612P6K001,9CRA0848P8A003,9GA0312P3K020,9GA0312P3K012,9GA0312P3K013,9GA0312P3K014,9GA0312P3K016,9GA0312P3K017,9GA0312P3K018,9GA0312P3K019,9CRA0612P6K007,9CRA0612P6K008,9CRA0612P6K005,9CRA0612P6K006,9GA0312K3001,9CRA0612P6K009,9CRA0848P8G011,9CRA0848P8G012,9CRA0848P8G010,9GA0312H3D001,9CRA0848P8G013,9GA0312P3K0071,9GA0712P1G0011,9GA0312G3-3,9GA0312G3D001,9GA0712P1H001,9CRA0848P8G001,9GA0312G3D003,9GA0712P1H003,9CRE0612P0G001,9CRA0848P8G009,9CRA0848P8G006,109-U0057-01,9GA0312E3D0011,9CRA0848P8G007,9CRA0848P8G004,9CRA0848P8G005,9CRA0848P8G003,9GA0312E30011,109-U0025-01,109-U0064-01,SAN ACE 70,9GA0312H3001,9GA0312P3K2031,9GA0312H3002,9GA0312H3003,9GA0712P1G0031,9CRA0612P0S003,9CRA0824P8GD001,9GA0312E30021,9CRA0812H8001,9GA0312P3G016,9CRA0612P0S001,SAN ACE 80,9GA0312P3G014,9GA0712H1D003,9GA0312P3G015,9GA0312P3G012,9GA0712H1D001,9GA0312P3G013,9GA0312P3G010,9CRA0612P6K018-3,9GA0312P3G011,9GA0712P1G0041
SANYO DENKI（山洋电气）冷却系统/电力系统/伺服系统产品选型指南
型号- SANUPS P73J,9AT2560C-000□,SANUPS P73H,SMC100-B,SMC100-A,SANUPS E11A-LI,SANUPS P73L,9CT1-P,SMC520,9CT1-T,SANUPS N11C-LI,SANUPS A11M-LI,SANUPS A13A,SANUPS K33A,SANMOTION,SANUPS W73A,SANMOTION F3,SANMOTION F2,SANUPS E33A,SANUPS C23A,SANMOTION C S200,SANMOTION F5,SMC200-A,SMC200-B,SANUPS N11B-LI,9CT1-U001,SANUPS A22A,SANUPS A11N-LI,SANUPS P83E,SANMOTION R,SANUPS D11A,SANUPS A11N,SANUPS A11M,SANMOTION K,SANMOTION MODEL NO.PB,SANUPS A11K,SMC507,SANUPS A11J,SMC505,SANUPS S11A,SANUPS A11K-LI,SANUPS A23D,SANUPS A23C,SANUPS M53A,9AT2560A-000□,SANUPS K23A,9CT1-A,SANUPS E23A,SANMOTION C S500,SANUPS E11B,SANUPS E11A,9AT2560S-000□,SANUPS G53A,SANUPS E11B-LI,9CT1-001,SMC-USBW-01,SANMOTION C S100,9CT1-002,SANUPS T,SANMOTION G,SANMOTION C,SANUPS K23A M TYPE,9AP1600-1,SANUPS RMA
SANYO DENKI Develops 60×60×56mm Counter Rotating Fan with the Highest Static Pressure and Airflow in the Industry
SANYO DENKI has developed and launched the 60×60×56mm San Ace 60 9CRH type Counter Rotating Fan that features the highest static pressure and airflow in the industry. It is suitable for cooling servers and ICT equipment.
产品 发布时间 : 2024-06-19
DC Fan Counter Rotating Fan Splash Proof Fan Splash Proof Centrifugal Fan Oil Proof Fan Long Life Fan Centrifugal Fan Blower
型号- 9WS1212H101,9WV0848P1H001,9W1TM48P4H01,109L1212H101,9CRA0412K401,9GV1212P4G01,9TM48P4H,109BF12HC2,9BMB12P2G01,9CRA0312P4K03,9WF1224H101,9GV1212J1011,9BMB12G201,9LG0612P4S001
20 Years of Cost-Effective Performance With SANYO DENKI Long Life Cooling Fans
By drastically reducing maintenance needs, the Long Life Fan allows you to allocate resources more effectively, enhancing the cost-effectiveness of your projects. It’s a strategic choice that delivers ongoing savings and strengthens your competitive edge.
厂牌及品类 发布时间 : 2024-07-31
SANYO DENKI Launches φ250×99mm Centrifugal Fan with IP56 Splashproof option with the Highest Airflow of 936CFM Max
SANYO DENKI has developed and launched the San Ace 250AD φ250×99mm Centrifugal Fan and Splash Proof Centrifugal Fan. These fans feature the highest airflow in the industry. They are ideal for air conditioning systems and cooling inverters and telecom equipment cabinets.
新产品 发布时间 : 2023-01-22
SANYO DENKI Releases San Ace 120AD ACDC Fan and Splash Proof ACDC Fan with Highest Airflow of 3.9m³/min and Static Pressure of 170Pa Max
SANYO DENKI CO., LTD. has developed and launched the San Ace 120AD 120×120×38mm ACDC Fan(2) and Splash Proof ACDC Fan that feature the highest airflow and static pressure in the industry. (1) These fans are ideal for control panels, food manufacturing equipment, and plant factories.San Ace 120AD 9ADA type ACDC FanSan Ace 120AD 9ADAW type Splash Proof ACDC FanFeatures1. High Airflow and High Static PressureThe San Ace 120AD 9ADA type ACDC Fan delivers a maximum airflow of 3.9m³/min and maximum static pressure of 170Pa,(3) which are approximately 1.3 times and 2 times higher than SANYO DENKI cur
新产品 发布时间 : 2023-01-24
Current Specifications of DC Cooling Fans You Need To Know
When designing a fan 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.
技术探讨 发布时间 : 2024-07-24
SANYO DENKI Releases San Ace 160AD ACDC Fan and Splash Proof ACDC Fan with the Industry‘s Highest Airflow of 8.2m³/min and Static Pressure of of 167 Pa Max
SANYO DENKI has developed and launched the San Ace 160AD 160×160×51mm ACDC Fan and Splash Proof ACDC Fan that feature the highest airflow and static pressure in the industry. They deliver a maximum airflow of 8.2m³/min and maximum static pressure of 167 Pa, both of which are leading in the industry.
新产品 发布时间 : 2023-01-19
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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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