Fan system and electronic device

By using the pulse signal generation unit and the rotation detection unit for feedback control in a multi-fan system, the noise problem caused by inconsistent fan speeds is solved and the mute effect of the multi-fan system is achieved.

Active Publication Date: 2012-03-14
NIDEC CORP(JP)
View PDF6 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such an approach, complex control is required
In addition, when many fans are rotated, there is a concern that chopping noise may be generated due to a period in which the rotational speeds of the plurality of fans are close to each other.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0032] figure 1 It is a front view showing the rack-type electronic system 1 according to the first exemplary embodiment of the present invention. figure 2 is a right side view of the rack-type electronic system 1 . A rack-mounted electronic system 1 as electronic equipment includes a housing 11 , a plurality of substantially plate-shaped blade servers 12 , a plurality of power supply units 13 , and four fan units 14 . Hereinafter, the blade server 12 is simply referred to as "server 12".

[0033] The outer shape of the housing 11 is a cuboid. The casing 11 houses a plurality of servers 12 , a plurality of power supply units 13 and a plurality of fan units 14 . The housing 11 has openings at the upper and lower portions. The servers 12 are arranged horizontally in an upright state. The rows of servers 12 are installed at three positions in the vertical direction. Such as figure 2 As shown, the power supply unit 13 is disposed behind the row of servers 12 . Fan units ...

no. 2 approach

[0051] Figure 7 It is a figure which shows the fan system 20a of 2nd Embodiment which was illustrated in this invention. The fan system 20 a has a first fan 2 a , a second fan 2 b and a pulse signal generator 4 . The first fan 2a and the second fan 2b are axial flow fans, and are arranged so that their central axes coincide. A so-called double counter-rotating axial flow fan is constituted by the first fan 2a and the second fan 2b.

[0052] The basic structure of the first fan 2a and the second fan 2b and Figure 4 same. That is, FLL control is performed by the rotation detection unit 241 , the drive circuit 242 , and the rotational speed control circuit 243 . Reference pulse signals are input from the pulse signal generating unit 4 to the first fan 2 a and the second fan 2 b, respectively. For the two fans 2a, 2b, the reference pulse signals of the same period can be input, and the reference pulse signals of different periods can also be input. The fans 2a, 2b rotate a...

no. 3 approach

[0055] Figure 8 It is a figure which shows the fan system 20b of 3rd Embodiment which was illustrated in this invention. The fan system 20 b has a first fan 2 c , a second fan 2 d , and a pulse signal generator 4 . The 1st fan 2c and the 2nd fan 2d are centrifugal fans, and are arrange|positioned at intervals in the left and right so that the central axis may coincide.

[0056] Heat generating bodies 6 such as a CPU are arranged between the first fan 2c and the second fan 2d. In the first fan 2c, from the opening 24 along the central axis Figure 8 Intake is carried out in the left direction of the impeller, and the exhaust is carried out from the opening 25 along the direction perpendicular to the central axis through the impeller. In the second fan 2d, from the opening 24 along the central axis Figure 8 The right direction of the air intake is carried out, and the exhaust is carried out from the opening 25 along the direction perpendicular to the central axis through t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A fan system includes a pulse signal generation portion and a plurality of fans. Each of the plurality of fans preferably includes a motor portion; an impeller arranged to be rotated by the motor portion; a drive circuit arranged to drive the motor portion; a rotation detection portion arranged to detect rotation of the motor portion; and a rotation rate control circuit arranged to, based on a reference pulse signal supplied from the pulse signal generation portion and an actual rotation pulse signal supplied from the rotation detection portion, exercise feedback control on a rotation rate of the motor portion in accordance with a period of the reference pulse signal.

Description

technical field [0001] The invention relates to a fan system with a plurality of fans, preferably arranged in an electronic device. Background technique [0002] In large-scale communication equipment and routers, a so-called fan tray in which many fans are arranged is used. In the fan tray, the speed of the fans is controlled according to the temperature inside the device. Since various PWM (Pulse Width Modulation: Pulse Width Modulation) control devices dedicated to fans are sold on the market, fans have been controlled using PWM in the past. In PWM control, a PWM signal having a pulse width corresponding to the rotational speed of the fan is input to the fan. The PWM signal is generated by a control board mounted on the fan tray. In the fan, the PWM signal is smoothed by an internal circuit and converted into a direct current (DC) voltage. The microcomputer inside the fan performs feedback control on the rotational speed according to the DC voltage. [0003] However,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityApplications(China)
IPC IPC(8): F04D25/08F04D29/66F04D27/00
CPCF04D25/166F04D27/004F04D29/582Y02B30/70
OwnerNIDEC CORP(JP)