Unlock instant, AI-driven research and patent intelligence for your innovation.

System for controlling ac motor rotation speed

An AC motor and motor technology, applied in control systems, AC motor control, electrical components, etc., can solve problems such as interfering noise and poor efficiency

Inactive Publication Date: 2006-03-29
EBM PAPST MULFINGEN GMBH & CO KG
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method only involves three-phase motors, not single-phase AC motors such as capacitor motors or shaded pole motors
[0009] All these known control systems have a major disadvantage of poor efficiency and in some cases disturbing noise

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • System for controlling ac motor rotation speed
  • System for controlling ac motor rotation speed
  • System for controlling ac motor rotation speed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] Identical parts are always marked with the same reference symbols in the various figures and are therefore generally only described once in each case.

[0038] According to FIG. 5 , the controllable electronic switching device 2 is connected upstream of the AC motor M. As shown in FIG. The switching device 2 is preferably formed as an electronic power switch, in particular a triac or a thyristor, in which case an additional driver stage can also be arranged between the control device 4 and the power switch. In this case, the motor M takes the form of a capacitor motor having a main winding AW and connected in parallel to this main winding a series circuit formed by an auxiliary winding HW and a capacitor. The motor M can also take the form of a shaded pole motor, in which case there is no auxiliary winding HW or capacitor C. The switching device 2 is excited by the control device 4 so that the input sinusoidal AC voltage (power supply voltage) U N Generates a motor AC...

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

The system has an electronically controlled switch (2) connected before the motor that is driven by a control unit (4) so that a variable AC motor voltage (UM) is produced from a sinusoidal input AC voltage (UN) to vary the revolution rate. The control unit is designed to vary the AC motor voltage with respect to its fundamental frequency and / or amplitude by phase conduction.

Description

technical field [0001] The invention relates to a system for controlling the rotational speed of an AC motor, in particular a capacitor motor or a shaded pole motor, in which case a controllable electronic switching device connected upstream of the motor is activated by a control device so that a sinusoidal input AC voltage is used to generate a variable Change the AC voltage of the motor to change the speed. Background technique [0002] Capacitor motors or shaded pole motors are generally operated from a single-phase AC power supply and are used, for example, to drive fans, pumps and the like. In the case of such a drive, for example in the case of a fan, the various available power levels (airflow levels), usually in specific steps, are often required for different modes of operation. Thus, for example, in the case of fume hoods, various fan speeds can be used in order to vary (increase / decrease) the air flow. In air-conditioning systems, heat exchangers, or generally i...

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 & Authority Patents(China)
IPC IPC(8): H02P27/02H02P25/04H02P27/18
CPCH02P25/04H02P27/18
Inventor A·莱尔克斯J·克罗特希
Owner EBM PAPST MULFINGEN GMBH & CO KG