HVAC Motor Control

The following tables list the units requiring motor control that are used in the two types of air conditioning system. The use of inverters and brushless DC motors is increasing in variable speed motor control applications requiring energy efficiency. In addition, an individual indoor unit or outdoor unit may contain multiple motors requiring control. Renesas offers development kits for the control systems most appropriate for three motor types: induction motors, brushless DC motors, and stepping motors.
Also we offer a wide range of products that are able to control multiple motors, from low end to high end, low power consumption, and microcontrollers equipped with floating point processors (FPUs).

Motor Control Units in Central
Air Conditioning Systems

UnitMotor Control Application
AHUFan
FCUFan
VAVDamper
Outdoor-air processing unitFan
ChillerCompressor
Heat sourceFan
Cooling towerFan
Feed water pumpPump
Cooling water pumpsPump

Motor Control Units in Individual
Air Conditioning Systems

UnitMotor Control Application
Indoor unitFan, damper
Outdoor unitFan,compressor
Outdoor-air processing unitFan

Recommended Devices for Motor Control

Recommended Devices for Motor Control

HVAC Communications

Regardless of the type of air conditioning system, generally speaking the various units are connected to a wired or wireless network to facilitate control and state management. In the context of building automation in particular, BACnet* is used to connect HVAC devices from different manufacturers and configure the building management system. Figure below shows conceptual diagrams of HVAC system communication in a central air conditioning system and an individual air conditioning system, respectively.
In the central air conditioning system, digital signals (DI and DO) and analog signals (4-20mA) are used for communication between sensors, VAV units, and general-purpose controllers. Due to the long distances involved and need for noise tolerance, Renesas offers communication solutions that employ power line communication (PLC).

  • *BACnet (Building Automation and Control Networking protocol) is an open protocol established in 1995 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). In 2003 it was adopted as the international standard ISO 16484-5.

Overview of Building Air Conditioning Communication Network

Overview of Building Air Conditioning Communication Network

HVAC User Interface

They employ devices that use human machine interface (HMI) technology such as fan coil units (FCUs), variable air volume (VAV) and remote control for indoor machines to operate a screen in order to adjust the set temperature individually.
The recent trend is away from using fixed mechanical keys (mechanical switches) and toward the use of touch panels. These touch panels must be able to withstand demanding environmental conditions, including high noise levels, water, dirt, and temperature variations. Renesas offers HMI solutions that meet these challenges.

解决方案

电机控制

瑞萨电子电机控制解决方案旨在通过降低电机功耗来提高建筑效率。为适应各种产品应用,我们采用了一些列的电动机控制方法,这些方法在研发期间都存在困难。

感应

这些解决方案适用于构建安全系统,并提供低成本、低功耗、高精度的测量。使用这些参考板可显著缩短开发时间。

连接

瑞萨电子连接解决方案可用于无线通信(BLE和Sub-GHz)和有线通信(PLC)应用。它们使客户能够构建链接设备和系统网络,而无需安装新的布线。

用户界面

瑞萨电子HMI解决方案中包含用独有的触摸屏传感技术制作的微控制器,并在定制开发环境进行开发,有助于快速开发高级产品。还有一些解决方案可以通过支持视频和3D图形的界面提高易读性和易用性。