Easy Guide on Open Loop vs. Closed Loop Control in DC Cooling Fans

2024-07-26 SANYO DENKI Official Website
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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- 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

May 17, 2024  - SANYO DENKI  - 产品变更通知及停产信息 代理服务 技术支持 现货查询 批量订货

How to Use PWM Speed Control to Improve Efficiency of Cooling Fans

When designing in the right fan, design engineers must balance the airflow requirements within their system with the power requirements to run the fans and the noise constraints of their particular application. PWM is a tool that allows engineers to balance these variables based on the demands put on their system at any given time.

2024-07-23 -  技术探讨 代理服务 技术支持 现货查询 批量订货

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

24.5  - SANYO DENKI  - 选型指南  - Ver. 4 代理服务 技术支持 现货查询 批量订货

SANYO DENKI Company Profile 2023-2024

型号- N11C-LI,D11A,C23A,S500 SERIES,S500,W73A,H SERIES,P61B,K33A,A11K,ABS865,E23A,P73D,G53A,A22A,P83E

2023/8/10  - SANYO DENKI  - 商品及供应商介绍 代理服务 技术支持 现货查询 批量订货

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

2023-01-24 -  新产品 代理服务 技术支持 现货查询 批量订货

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.

2024-07-31 -  原厂动态 代理服务 技术支持 现货查询 批量订货

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.

2023-01-22 -  新产品 代理服务 技术支持 现货查询 批量订货

SANYO DENKI Technologies Creating Change Technical Report

型号- N11C-LI,RS1C15,RS3C15,N11C-LI SERIES,9LG1448P5S001,9WL1412P5G001,RS1D30,9LG1412P5G001,N11CL152,9WL1448P5S001,9LG1424P5G001,9CRLA0612P0G001,9WL1424P5G001,RS3C30,9LG1424P5S001,N11CL502,9CRLA,9WB1412S501,N11CL302,9LG1412P5S001,9WL1448P5G001,9CRLA TYPE,9WL1424P5S001,9LB1412S501,9WL1412P5S001,9LG1448P5G001

November 2018  - SANYO DENKI  - 技术文档 代理服务 技术支持 现货查询 批量订货

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.

2024-07-24 -  技术探讨 代理服务 技术支持 现货查询 批量订货
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射频无源器件定制

可定制射频隔离器/环行器(10M-40GHz),双工器/三工器(30MHz/850MHz-20GHz),滤波器(DC-20GHz),功分器,同轴负载,同轴衰减器等射频器件;可定制频率覆盖DC~110GHz,功率最高20KW。

最小起订量: 1 提交需求>

DC轴流扇定制

可定制DC轴流风扇的尺寸范围:30*30*10~92*92*38mm;转速:1000~16500RPM;噪音≥19 db-A;最大风压范围:1.25~110.83mmH20;风量范围:0.05~186.87CFM。

最小起订量: 3000 提交需求>

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