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Fan and its speed control method

A control method and technology of fan speed, applied in the direction of single motor speed/torque control, pump control, excitation or armature current control, etc., can solve the problems of complex circuit, difficult use and maintenance, easy to generate noise, etc. The effect of closed space stabilization

Active Publication Date: 2020-12-04
SUNONWEALTH ELECTRIC MACHINE IND
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] However, to read the current value, the ammeter must be connected in series with the circuit under test. Therefore, the motor line needs to be cut off before installing or replacing the ammeter, which makes it difficult to use and maintain, and the current signal needs to be enhanced by an amplifier, which is prone to noise. Additional components such as filters need to be connected to remove noise, so the circuit is complex, increasing the cost of circuit setup, and the accuracy of calculation results affects the stability of the speed

Method used

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  • Fan and its speed control method

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Embodiment Construction

[0044] In order to make the above-mentioned and other objects, features and advantages of the present invention more comprehensible, the following is based on the preferred embodiments of the present invention and is described in detail as follows in conjunction with the accompanying drawings:

[0045] The "flow rate" mentioned throughout the present invention refers to the product of the ventilation area of ​​the fan and the wind speed passing through the area, and the unit is cubic meter per second (m 3 / s), those of ordinary skill in the technical field of the present invention can understand.

[0046] The "static pressure" mentioned in the present invention refers to the pressure that the gas acts on the surface of the object, and the pressure perpendicular to the air flow direction is measured by a pressure measuring hole on the pipe wall, and the unit is Pa (Pa), Those of ordinary skill in the technical field to which the present invention belongs can understand.

[0047]...

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Abstract

A method for controlling a rotational speed of a fan ( F ) includes using a control unit (1) to start a motor (2) according to an initial duty cycle value ( D ). In a first constant speed step ( S1 ), the duty cycle value ( D ) is changed to make a motor rotational speed ( R ) equal to a first target rotational speed ( R1 ). When the duty cycle value ( D ) and a first target duty cycle value ( D1 ) satisfy a first relational expression, the motor rotational speed ( R ) is compared with a second target rotational speed ( R2 ), and the duty cycle value ( D ) is changed to make the motor rotational speed ( R ) equal to the second target rotational speed ( R2 ). When the duty cycle value ( D ) and a second target duty cycle value ( D2 ) satisfy a second relational expression, the first constant speed step ( S1 ) is performed. A fan ( F ) is also disclosed.

Description

technical field [0001] The present invention relates to a fan and its speed control method, in particular to a fan capable of automatically adjusting the speed without referring to the operating current value of the motor and its speed control method. Background technique [0002] Existing ventilation fans, or ventilators, can be connected to multiple spaces or machines by multiple air ducts, and a motor drives the fan to rotate to push air flow for ventilation or exhaust. Factors such as the size and quantity of the space to be exhausted, the length of the air duct, and the width of the diameter will all affect the static pressure on the fan. When the power driven by the motor to rotate the fan is fixed, the increase in the static pressure will reduce the air volume of the fan, and vice versa. , the decrease in static pressure increases the air volume of the fan. When the air volume of the fan is less than the required total exhaust volume, it will cause low exhaust gas emi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D27/00
CPCF04D27/004H02P6/08H02P7/29
Inventor 洪银树邱智翔
Owner SUNONWEALTH ELECTRIC MACHINE IND
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