CN102545157A - Motor temperature measurement and overtemperature protection method of drum washing machine - Google Patents
Motor temperature measurement and overtemperature protection method of drum washing machine Download PDFInfo
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- CN102545157A CN102545157A CN2011104541281A CN201110454128A CN102545157A CN 102545157 A CN102545157 A CN 102545157A CN 2011104541281 A CN2011104541281 A CN 2011104541281A CN 201110454128 A CN201110454128 A CN 201110454128A CN 102545157 A CN102545157 A CN 102545157A
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- motor
- temperature
- washing machine
- protection method
- stator
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Abstract
The invention discloses a motor temperature measurement and overtemperature protection method of a drum washing machine. The motor temperature measurement and overtemperature protection method comprises the following steps of: after receiving speed output, a motor drive controller first outputs a direct-current voltage and stabilizes the direct-current voltage for a certain time; a stator current is acquired by adopting a current sampling circuit; a stator resistance R is calculated by the Ohm's law; and a stator temperature T is calculated with a formula and judging whether overtemperature happens. The motor temperature measurement and overtemperature protection method disclosed by the invention has the advantages of no need of extra equipment, low cost, simple structure, short whole measurement and judgment, high temperature and capability of effectively protecting a motor.
Description
Technical field
The present invention relates to roller washing machine, particularly the motor protection method of roller washing machine.
Background technology
Roller washing machine comprises cabinet, gate, tube, clothing tube and control system are filled with water; Gate is positioned at the positive or end face of casing to open and close; The tube that is filled with water is fixed in the casing through supporting mechanism and hitch, and it is inner that the clothing tube is installed in the tube that is filled with water, and motor and clothing tube are through belt and belt pulley transmission; Motor driver is used for drive motors, and the master controller system is used for controlling the entire work process of washing machine.
The operational environment of the motor of roller washing machine is more abominable, usually in hot and humid environment, work, and loading condition is complicated, easily the overheated fault that causes.Motor commonly used is a threephase asynchronous machine, can find out that from the structure of threephase asynchronous machine the stator coil of motor is parts the hottest in the motor, so can estimate the temperature of whole motor according to the temperature of stator coil.Given this, in order to realize the motor overheat protector, all in stator coil, seal in overheated short-circuiting device at present, so not only increased the motor reliability of cost but also influence.
On the other hand; Stator for copper coil; The corresponding relation of its temperature and resistance is
; Can find out by formula; If know Coilreference temperature
and resistance
, just can calculate corresponding temperature
through the resistance value of measuring sometime
then.
Summary of the invention
The objective of the invention is in order to overcome the shortcoming of the described existing overheated short-circuiting device mode of background technology; Characteristics to copper coil stator; Invent the motor temperature method of measurement that a kind of measuring speed is fast, precision is high, and the motor overheating guard method that relies on this method.
The method of concrete measurement roller washing machine motor temperature is:
1, after the master controller inbound pacing output command of washing machine, motor drive controller at first drive motors gets into the temperature survey program; The operation of said main controller controls whole washing machine, driving governor are the driver elements of motor;
2, driving governor is exported a direct voltage, and time-delay a period of time makes it stable;
3, driving governor obtains the electric current I through the stator coil of motor through current sampling circuit;
4, calculate the resistance of coil of stator of motor according to Ohm's law;
5, calculate the temperature T that obtains stator coil with formula
;
6, judge whether motor overheating according to the stator coil temperature T, if overheated, then get into electric motor protecting, do not move; If not overheated, motor normally moves.
The method that the present invention adopted needs only the overtemperature protection that just can realize motor through the method for software, need not the overheated short-circuiting device of extra increase, and cost is low, and is simple in structure.And this method measurement motor temperature precision is high, and speed is fast.
Description of drawings
Fig. 1, temperature survey sequential chart of the present invention.
Fig. 2, flow chart of the present invention.
Embodiment
Like Fig. 1; Match with the output speed
of master controller; The direct voltage V1 that temperature is used is measured in driving governor output; And time-delay lets voltage stable a period of time, measures computing again.
Idiographic flow like Fig. 2.When motor for washer does not have operation; Be in holding state; Temperature monitoring to motor is ready with protection, and when whole flow process began, at first master controller received user's instruction: the operation motor; The motor speed of service that receives is
; Just instruct at first output dc voltage V1 of electric machine controller, the direct voltage here is according to electric current and the decision of motor coil resistance, and requirement is that the electric current I that is used for participating in calculating is 1.4 ~ 1.8A; So according to the specification of existing motor for washer, the direct voltage V1 of output is 5 ~ 7V.
Time-delay 80 ~ 100ms; Wait voltage is stable; Obtain the electric current I through coil of stator of motor through current sampling circuit then,
calculates stator coil resistance according to Ohm's law.
Using formula according to stator coil resistance:
calculate the temperature T of stator coil.
Protection critical temperature with this stator coil temperature T and setting at last compares, and setting the protection critical temperature is 130 ~ 140 ℃.Surpass this temperature, think motor overheating, motor gets into guard mode, do not move; Do not surpass, motor normally moves, and in the time of normal operation, appliance controller output AC electricity lets motor rotation, and voltage requires to be the scope between 20V ~ 120V according to different rotating speed.
The time of whole measurement and judgement is no more than 120ms, concerning the user, postpones sensation, and computational accuracy higher (can reach ± 5 ℃ level), thereby effectively protects the motor of roller washing machine.Whole flow process can be used computer control, realizes that with the mode of software need not to increase extra transducer, cost is low, simple in structure, does not also influence the operate as normal of motor.
Claims (4)
1. the motor temperature of roller washing machine is measured and excess temperature protection method, and it is characterized in that: step is following,
One, after the master controller inbound pacing output command of washing machine, motor drive controller at first drive motors gets into the temperature survey program; The operation of said main controller controls whole washing machine, driving governor are the driver elements of motor;
Two, driving governor is exported a direct voltage, and time-delay a period of time makes it stable;
Three, driving governor obtains the electric current I through the stator coil of motor through current sampling circuit;
Four, calculate the resistance of coil of stator of motor according to Ohm's law;
Five, calculate the temperature T that obtains stator coil with formula
;
Six, the protection temperature comparison according to stator coil temperature T and setting judges whether motor overheating, if overheated, then gets into electric motor protecting, does not move; If not overheated, motor normally moves.
2. the motor temperature of roller washing machine according to claim 1 is measured and excess temperature protection method, and it is characterized in that: described step 2, the direct voltage of output are 5 ~ 7V; Time-delay 80 ~ 100ms makes it stable.
3. the motor temperature of roller washing machine according to claim 1 is measured and excess temperature protection method, and it is characterized in that: described step 6, the protection temperature of setting is 130 ~ 140 ℃.
4. the motor temperature of roller washing machine according to claim 1 is measured and excess temperature protection method, and it is characterized in that: described step 3, the electric current I scope of the stator coil of acquisition is 1.4 ~ 1.8A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104541281A CN102545157A (en) | 2011-12-30 | 2011-12-30 | Motor temperature measurement and overtemperature protection method of drum washing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104541281A CN102545157A (en) | 2011-12-30 | 2011-12-30 | Motor temperature measurement and overtemperature protection method of drum washing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102545157A true CN102545157A (en) | 2012-07-04 |
Family
ID=46351382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104541281A Pending CN102545157A (en) | 2011-12-30 | 2011-12-30 | Motor temperature measurement and overtemperature protection method of drum washing machine |
Country Status (1)
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| CN (1) | CN102545157A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110545066A (en) * | 2018-05-29 | 2019-12-06 | 青岛海尔智能技术研发有限公司 | Linear compressor coil temperature monitoring method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1540930A (en) * | 2003-10-31 | 2004-10-27 | 华中科技大学 | Synthetic Testing System of Mail Server Performance |
| CN101029915A (en) * | 2006-09-11 | 2007-09-05 | 国电南瑞科技股份有限公司 | Method for measuring winding temperature and overheat protecting AC inductive motor |
| CN101838917A (en) * | 2009-10-27 | 2010-09-22 | 南京乐金熊猫电器有限公司 | Washing machine and control method thereof |
| CN101841300A (en) * | 2008-12-22 | 2010-09-22 | 伊顿公司 | Monitor and control the system and method for stator winding temperature in the de-energized AC motor |
-
2011
- 2011-12-30 CN CN2011104541281A patent/CN102545157A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1540930A (en) * | 2003-10-31 | 2004-10-27 | 华中科技大学 | Synthetic Testing System of Mail Server Performance |
| CN101029915A (en) * | 2006-09-11 | 2007-09-05 | 国电南瑞科技股份有限公司 | Method for measuring winding temperature and overheat protecting AC inductive motor |
| CN101841300A (en) * | 2008-12-22 | 2010-09-22 | 伊顿公司 | Monitor and control the system and method for stator winding temperature in the de-energized AC motor |
| CN101838917A (en) * | 2009-10-27 | 2010-09-22 | 南京乐金熊猫电器有限公司 | Washing machine and control method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110545066A (en) * | 2018-05-29 | 2019-12-06 | 青岛海尔智能技术研发有限公司 | Linear compressor coil temperature monitoring method |
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Application publication date: 20120704 |