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Variable speed drive for a chiller system

一种变速驱动器、冷却器的技术，应用在单个同步机的启动器、控制系统、加热/冷却设备等方向，能够解决设计有效的和低成本的电动机困难、输入电压限制、限制高速感应电动机运转效率等问题，达到改善输入功率品质、成本降低、改善平稳运行的效果

Active Publication Date: 2008-07-09
JOHNSON CONTROLS TYCO IP HLDG LLP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the output voltage of the VSD depends on the magnitude of the DC link voltage, when operating close to the maximum speed, the ability to withstand such a temporary voltage dip for a few seconds will be limited, so the input voltage is limited.
[0006] Additionally, this limitation on the output voltage from the VSD limits the operational efficiency of high-speed induction motors in chiller systems
High speed electric motors for obtaining faster compressor speeds in the absence of a "boost" gearing arrangement are limited due to efficient and low cost designs when a reduced maximum operating voltage is available at maximum operating speed The motor is more difficult

Method used

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  • Variable speed drive for a chiller system
  • Variable speed drive for a chiller system
  • Variable speed drive for a chiller system

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Embodiment Construction

[0021] Figure 1 generally illustrates the system configuration of the present invention. An AC power source 102 supplies AC power to a variable speed drive (VSD) 104 , which in turn supplies AC power to an electric motor 106 . In another embodiment of the invention, VSD 104 is capable of powering more than one electric motor. The electric motor 106 is preferably used to drive a corresponding compressor of a refrigeration or chiller system (see generally FIG. 3 ). AC power source 102 provides single-phase or multi-phase (eg, three-phase) fixed voltage and fixed frequency AC power to VSD 104 from an AC power grid or distribution system provided at the site. The AC power grid can be supplied directly from the power facility or from one or more substations between the power facility and the AC power grid. The AC power source 102 can preferably supply a three-phase AC voltage at a nominal line frequency of 50 Hz or 60 Hz or a nominal line voltage of 200V, 230V, 380V, 460V, or 600...

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PUM

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Abstract

Provides a variable speed drive with a boost converter for chiller systems driven by induction motors. The boost converter can be a diode or silicon controlled rectifier followed by a boost DC / DC converter or a three-phase pulse width modulated boost converter. The boost converter provides a boosted voltage to the DC link, which causes the boosted voltage to be applied to the induction motor by the inverter of the variable speed drive.

Description

technical field [0001] The present invention generally relates to variable speed drives for chiller systems. More particularly, the present invention relates to variable speed drives with boost capability for use in variable speed cooler systems. Background technique [0002] In the past, the motors used to drive the compressors in chiller systems were designed to run from the standard line (primary) voltage and frequency available from the distribution system of the facility at which the motors were run. Because the electric motor is limited to one operating speed based on the input frequency of the motor, the use of line voltage and frequency typically limits the options for modulating the capacity of the compressor to less efficient mechanisms like inlet guide vanes and slide valves device. Additionally, if the operating speed of the motor is not equal to the desired operating speed of the compressor, a "step up" or "step down" transmission is inserted between the motor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/45H02M7/48H02M7/00
CPCB60H1/00428H02P27/08H02P2201/09Y02T10/88H02P1/46H02M7/48
Inventor 伊凡·杰德里克哈罗德·R·施内茨卡
Owner JOHNSON CONTROLS TYCO IP HLDG LLP
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