TW416177B - Control method and protection device using current control to prevent overheating of the internal parts of motor - Google Patents

Abstract

The invention relates to a control method and protection device that uses current control to prevent the internal parts of the motor to be overheated. The major part include the setup unit, sensor unit, central processing unit, current control unit, alarm unit, power supply cut-off and protection unit. It uses the sensor unit to detect the temperature of fixed position of the motor's coil (or stator, shell, etc.). And output a corresponding signal to the current control unit bases on the comparsion result of detected value and setup value. The current control unit controls the current input the motor based on the control signal to control the rotation speed so as to obtain the object of unloading to protect the motor from being broken due to overheated or making disaster and increase the lifetime of the motor effectively.

Description

416177 V. Description of the invention α) The present invention relates to a method for controlling the overheating of a part and the change of the rotational speed of the protective installed device 'to perform timely unloading and prolong the service life. According to the normal motor operation, the internal temperature will damage the insulation of the bad coils, which shortens the result. When the temperature rises, "the temperature rise is generally controlled for every 10th design of the motor protection device." The main use of external relations (such as bimetallic pieces) to carry out different operations on overloaded relays. The 'thermodynamic' operating principle is that when the overcurrent or the short circuit occurs, the protector's normally closed contact will be opened. When the current flowing through the coil is large, the normally closed contact is opened to prevent the motor from turning off. Generally, it is placed in the motor to measure the internal temperature of the motor. When the electric power occurs, the 'internal temperature protection opens and stops operation' to ensure that the motor is not loaded. The protection of the electric power and the internal temperature is controlled by F). That is, when the electric power is used to prevent the electric motor from being built-in. The electric power is controlled to control the electric motor, which effectively protects the motor from being overheated and generating an overload condition. As the temperature rises, the life of the motor will be ruined. In fact, the insulation life of experiment c is halved, so the temperature rise is the main consideration, that is, it can be resolved immediately; while the traditional motor part overload release and internal temperature protection open the motor overload and overheat protection, this can be divided into Two basic types, which are the action of electric bimetallic elements of thermal sensing elements (such as bimetallic pieces), thus stopping the motive; the second type is electromagnetic, which generates a large magnetic force to cause the protector to burn out due to overload. The internal temperature protects the proper position of the windings in order to accurately shut down the power due to overload or other poor heat dissipation and force the motor to burn out due to overheating. Only the above-mentioned various overload types are two-position type (〇N — 〇p >

Unnamed

IIMM ^-~~~ 416177 V. Description of the invention (2) Stopping the motor 'and the motor's life will be shortened at this time to prevent damage to the motor and prevent it from protecting the operating life. The guaranteed work will inevitably be suspended, and the roles it produces will vary, but there are similarities. The inventor of the present invention has finally completed the creation of this case in view of Xi ’s protection and taking into account the operation of the motor, that is, the temperature value of a fixed point of the machine, and after the comparison is made, a corresponding control signal is turned out according to this signal. Proper unloading operation can cause the motor to stop due to high temperature or the user to take precautions beforehand. It can avoid electricity to prevent the motor from burning due to internal overheating and prolong the service life of the motor. The purpose of the present invention is to improve the control method of overheating inside the electric motor, which is controlled by the electric quantity, preventing the overheating damage, and ensuring the performer of the motor.圏 It is often damaged due to overheating. The overload and overheating protection device * can only ensure the reliability of the operation. In addition, when the protection switch is activated and protected, the degree of damage caused by stopping the operation depends on the degree of damage. The degree of damage played by the motor is unavoidable. The overheating protection device cannot play the function of reliable disk protection in time. It is actively developed and invented. The sensing unit detects the electric power into the central processing unit and the set value for power control. Unit, and the electric power control motor changes its speed to properly control the temperature to prevent damage to the power treasure. In addition, a timely alarm is issued to remind the motive that only by selecting shutdown protection, plating and avoiding disasters, and effectively extend a supply Electricity control can be used to prevent and protect the device, so that the motor can be used to improve the service life of the motor under the condition of not overheating and not aging.

416177 V. Description of the invention (3) '' ~ * The following is a detailed description of the specific embodiments of the present invention in conjunction with the illustrations of the drawings. [Schematic description] ^ _ is a block diagram of the protection device of the present invention. The second figure 'is a flowchart of the control method (C) of the present invention. —Figure 'is a schematic block diagram of the connection between the protection device and the central monitoring room of the present invention. The fourth figure 'is a flowchart of the alarm control of the alarm unit of the present invention. The fifth figure 'is a flow chart of current control of the present invention. Fig. 'And Fig.' Are flowcharts for controlling the degree of aging of the present invention. The seventh diagram 'is a flow chart of the warning and registration control of the aging degree of the present invention. The first figure is a circuit embodiment (1) of the present invention. The ninth figure is a circuit embodiment (b) of the present invention. [Illustration of drawing number] Central monitoring room (3) Setting difference (X) Setting coefficient (Y) 122) Current (A) Setting current (AS) Protection device (1) Setting unit (11) Sensing unit (12) Sensing Test element (丨 21), central processing unit (13), alarm unit (14), power failure protection unit (15), power control unit (1 6)

416177 V. Description of the invention (4) Motor (2) Circuit (4) Aging index values Q (Qml, Qm2, ..., Qmn) at all levels Aging index value (Q t) Set aging index value (Q s) Aging Index value setting difference (Z) Detection side value (TA) Set temperature value TS (TS 1, TS 2, ..., Ding Sn-1, TSn, TS'l, TS'2, * '. TS' n -1, TS 'η) Speed of each stage N (N 1, N 2, ... Ninin, Npl, Np2, ... N pmax) Control method (C) Temperature difference between the detected value and the set temperature of each stage △ D (△ T 1, AT2, ΔΔη-1, ΔΤη, ΔΔ ', ΔΤ' 1, ΔΤ '2' ... ΔΤ'η-1 ΔΔ '')

Untitled page 7 416177__ V. Description of the invention (5) It has the function of detecting temperature. It mainly uses the sensing element (1 2 1) to set the fixed temperature for the motor (2) its coil (or stator, housing), etc. Detect and transmit this detection value to the central processing unit (1 3); a central processing unit (13) is a processing unit containing a control program as a command basis for creating its control method, and this central The main function of the processing unit (1 3) is to compare the detected value (TA) input by the sensing unit (1 2) with the set temperature value (TS) set by the setting unit (1 1), and then press the control The control method specified by the program outputs a corresponding control signal to the power control unit (1 6), alarm unit (1 4), power failure protection unit (1 5); an alarm unit (14), which unloads and cools down the motor (2) At the time, according to the preset operating modes and conditions, the central processing unit (1 3) will turn out the warning signals of each stage in a timely manner in order to cause the warning unit (1 4) to perform a warning action; a power failure protection unit ( 1 5), for the temperature of the motor (2) to reach the setting The time limit indicates that the aforementioned unloading can not effectively control the temperature rise of the motor. According to the signal output from the central processing unit (1 3), the power is turned off to prevent the motor (2) from being damaged due to overheating. An electric power control unit (16 ), According to the signal input from the central processing unit (13) to control the electric power input to the motor (2), and thereby to control the change of the rotation speed of the motor; by the combination of the above components, when the motor (2) is running, the sensing unit ( 1 2) its sensing element (1 2 1), that is, it continuously detects the temperature value of the set detection point of the motor (2) (ie, the detection value TA), and

Untitled page 8 416177 V. Description of the invention (6) This value (TA) is transmitted to the central processing unit (13) via the sensing unit (12), and this central processing unit (13) is a processing unit. According to the detection value (TA) and the set temperature value (TS1,.--TSu-l, TSn, TS, l, T S'2, ..., D-1, D-1, D-1) 8'1〇 According to the setting control program, the corresponding control signal is output to the power control unit (16), and the power control unit (16) controls the speed (N, N1) of the motor (2) based on the control signal. , N2, · · · Nmin 'Npl' N p 2,. * · N pmax) change, do the necessary unloading deceleration or reload speed-up operation, and when the temperature of the motor (2) reaches its maximum set temperature, The central processing unit (1 3) outputs a control signal to issue a warning action to the alarm unit (1 4), and a power-off protection unit (1 5) forcibly operates the power-off protection to prevent the motor (2) from overheating in time and thereby The motor (2) is used without overheating, thereby improving the service life and ensuring the The running function is performed in the state of not overheating and not aging. In addition, the internal overheating protection device (1) of the motor of the present invention can also be connected with the central monitoring room (3) (as shown in the third figure), that is, the central processing The signal output from the unit (1 3) is transmitted to the central monitoring room (3) to monitor the operation of the device. As for the installation position of the sensing element (1 2 1), it can be installed at an appropriate position on the motor (so as to be correct Where the temperature of the motor body is detected), such as a fixed point position on the housing of the motor (2) or an appropriate point embedded in the coil or stator, as shown in the circuit of FIG. 8 is a specific embodiment of the present invention

Untitled page 9 416177 V. Description of the invention (7) (1), in which the sensing element (the temperature value of the work 'electricity control unit (central processing unit (1 3) output control speed; the one shown in the ninth figure) Is), wherein the power control unit (2 2) is used to detect its temperature, and to detect the temperature of the motor (2), so that the two (TA) are overheated or aged to unload or Reload control. The control method of the operation mode of the present invention is based on the central processing of its instructions. The steps are as follows: 1 When TA > TSl + x, X represents the set difference), that is, the temperature value (TS 1) plus the setting Machine (2) its detection temperature value (τ deceleration unloading to reduce the temperature of the motor is low, DC brushless motor input unloading means), so when TA > χ (△ Τ 1 represents the first A temperature difference), electric 1: 2: when TA — TS2 == △ 丁 2 1) is used to detect the motor (2) iS) according to the signal produced by the device (1) to control the motor (2) The present invention Another specific embodiment (two 16) may be provided with a sensing element (1 in this case because there are two detection points, one is' one for the power control unit (only one temperature detection in the six detection points) Values can be controlled according to the following control method (C). The control method (C) is shown in the second figure. The control program in the unit (13) is

(TS1 represents the first set temperature detection value (TA) is greater than the value of the first set difference (X), 'represents electric A') exceeds the set temperature value 'must be used (for example, by stepping down the frequency of the inverter motor ... When tsi = ati 'is obtained by deceleration, and △ 丁 1 TA and the first set temperature value TS 1 are unloaded and decelerated to the first-stage speed N 2, and △ 丁 2 > ΔΤ1 + ×

416177 — ----- • BL, description of the invention (8) CTS2, TS3 ’’ ’TSii represent the second and third, respectively! ^ Stage set temperature values 'ΔΊΓ2, ΔΤ3 ·.. Respectively represent the second' third '' '11-1, 11th temperature difference in order), continue unloading and decelerate to the second stage speed N 2; In order, gradually continue to decelerate according to the following conditions: When Ding Bayi TS3 = △ Ding 3 'and △ Τ3 &gt; ΛΤ2 + χ, i continues to unload and decelerate to the third speed N3; until when τα — TSn = ATn, When 1 + χ, the motor is unloaded and stalled to the minimum speed Nmin, where TS2,.. TSn respectively represent the second set temperature value, ·., The Nth set temperature value, △ τ 2,.., △ 丁 n-1 , △ τπ respectively represent the second temperature difference, · *. The temperature difference of the η-1 term, the temperature difference of the η term, N 2 ·.. Nmin (Nmin stands for the lowest speed) respectively represents the deceleration of each level Rotation speed; 3-When ΊΑ-TS, 1 = ΛΤ, 1, and ΛΤ, 1 <△ 丁, — χ (TS, 1 represents the first set temperature value for speed increase, △ τ, 丄 represents the detection time T a and Speed-up first set temperature value T S '(the first temperature difference between 1)' indicates that the motor temperature has been reduced 'The motor can gradually reload and increase the speed to- Npi growth speed; gradually and sequentially under the following conditions, followed by reproduced ^

Page 11 416177 _.-I 1 _ V. Description of the invention (9) When TA — TS, 2 = AT '2 and Δτ' 2 &lt; ΔΤ, 1-X, the motor speed increases to the second speed. Νρ2 rotation speed; (and sequentially increase speed) until Ding Bayi Ding 5'11 = 8 1:11, and / \ 1''11 &lt;: Ba Ding '〇-1 —; ^, the motor speed increases to Maximum speed Np-max, where Npl, NP2,... Npmax respectively represent the speed of each level of speed increase "The above indicates that as long as the internal temperature of the motor exceeds a preset value, the motor is automatically unloaded to reduce the speed of the motor, so that the motor can be maintained at Operate at the maximum speed of overheating. When the motor is decelerated due to automatic unloading and its overheating factor is removed, it will automatically reload and increase speed, so that the motor will automatically recover the speed without any overheating, so as to maximize its operating performance. In addition, according to the present invention, the alarm unit (i 4) and the power failure protection unit C 1 5) receive signals from the central processing unit (1 3) and act according to the following control flow (as shown in the fourth figure): 1 When A &gt; TSl + x, it means that the internal temperature of the motor exceeds the set value of 疋 / · μ · degree, and the temperature must be reduced by unloading and deceleration, and the first stage warning is issued by the alarm unit (14); 2. When TA &gt; TS2 When + Yx (γ indicates the set coefficient), the second stage warning will be issued;

Untitled Page 12 416177 V. Description of the invention (10) TA &gt; TSn-l + Yx, issue the N- 丄 stage warning; until TA &gt; TSn + YX, the alarm unit (14) issues a warning at the most stage, and Power-off protection unit (i 5) forcibly performs power-off protection. ^ As mentioned above, the control method of the present invention mainly uses temperature as a control parameter, but in order to improve the control accuracy, the current can be classified as a control

When the number of field AC current) is greater than the set current (as), that is, A AS ^ because the motor load is too large, although the sensing temperature (τΑ) has not been set under the conditions of f *, but to protect the motor's service life, Then, the processing unit (1 3) outputs a control signal to the power-off protection unit (1 to enter the T-forced power-off protection (as shown in the first picture and the fifth)) The machine stops running. Although the Tanger L motor has not overheated, However, it may not be able to operate due to the aging positive f π. At this time, it will affect the subcontracting of the motor's connection system to a serious loss. For this reason, another embodiment of the present invention performs a degree of early warning control such as the sixth. As shown in the figure, the control after the control &gt;

Page 13 416177_ Description of the invention (11) The total aging index value of the system or component, Q s represents the set aging index value), when Qt &gt; Qs, the aging warning is issued by the alarm unit (1 4) 0 2 · When the aging warning is issued, when Qt &gt; Qs + Z (Z stands for the difference of the aging index setting), it indicates that the aging degree is serious. If it continues to be used, it will endanger the normal operation of the connected system, so the central processing unit (1 3) Output a control signal to the power control unit (16), alarm unit (1 4), power failure protection unit (1 5) to forcibly stop power output, and do a forced shutdown. 3 · When QtSQs or QtSQs + Z, it means that the range of aging degree is not exceeded. The running mode of the motor is executed according to the steps of control method (C). As for the alarm unit (1 5) to coordinate the monitoring of the degree of aging, and the central processing unit registers its value of the aging index (Q), the operation process is as follows (see Figure 7) 1. When TA &gt; TS1 + X At that time, issue the first stage warning and register the value of Qmi (Qml represents the system or component aging index value of TA> TS 1 + X). 2. When TA &gt; TS2 + YX (Y represents the set coefficient), issue the second stage warning and register the value of Qm2 (Qm2 represents the system or component aging index value of TA &gt; T S2 + YX) and sequentially follow TA &gt; T S3 + YX, issue the third stage warning and register the value of Qm3;

Untitled page 14 416177 V. Description of the invention (12) TA &gt; Sn-1 + YX, issue the N-1 stage warning, register the value of Q m (π-1); until TA &gt; TSn + YX, warning The unit (1 4) issues a warning at the final stage 'the power failure protection unit (1 5) forcibly performs power failure protection, and registers the value of Qinn. The present invention utilizes electric power control to prevent overheating protection inside the motor. It has a wide range of applications such as machinery and equipment using a motor as a source of rotational motion, such as compressors for refrigeration systems, dust shrinkers for compressed air, blowers, and water systems ... 'The protective effect is very significant; in addition, the electric power control of the present invention is used to control the speed of the motor to prevent overheating inside the motor.' It is intended to implement such as variable frequency controllers, brushless motor speed controllers, variable power or Variable voltage motor speed controllers, etc., can be implemented by the technical means of the present invention, and good use results are also obtained. In summary, the present invention can use the control of the motor speed change at the initial stage of the temperature rise of the motor to appropriately perform the unloading action, effectively overcome the shortcomings of the conventional motor overheating protection device, improve the service life of the motor and ensure the reliability of its operation. 'Practical progressive benefits.

Claims (1)

416177 VI. Application for Patent Scope 1. A control method that can use electric power control to prevent the motor from overheating. The control method (c) is mainly based on the control program in the central processing unit as its command basis. The steps are as follows: (1 ) When the detection value (τ A) is greater than the value of the first set temperature value (T s 1) plus the set difference value (X) (ie TA &TS; TS 1 + X) 'The motor is decelerated to a first speed (N1) ) (2) When the detected value (τ A) minus the second set temperature value (T s 2) is equal to the second temperature difference value (ΔΤ2), and the second temperature difference value (ΔΤ2) is greater than the first temperature difference value (ΛΤΙ) plus the value of the set difference (X), continue unloading to the second speed (N 2), and then sequentially subtract the set temperature value (TS) from the detection value (丁 A) in order. 3., · · Τ S η) is equal to the temperature difference between the detected value and the set temperature value at each level (△ T 3, ·· △ Τη-Ι'ΔΤη), and the temperature difference value at each level (ΛΤ 3 '· * · △ Τ'η-Ⅰ, △ Τπ) is greater than the temperature difference of the previous stage plus the set difference (X) of the stage, and then unloads and decelerates to electric in order in each stage Minimum speed (N mi η); (3) When the detected value (TA) minus the speed-up first set temperature value (TS '1) is equal to the speed-up first temperature difference (AT' 1) 'and the speed-up When the first temperature difference (Z \ T, 1) is less than the value of the first temperature difference (ΔΤΙ) minus the set difference (X), the speed at which the motor is reloaded to increase to the first speed (NP1) * ji sequentially subtracts the setpoint temperature value (TS4, ·. _ TSn) from the detection value (Τ A) in order to equal the temperature difference (△ T'2,... △ Τ'η-Ι ' ΛΤ'η), and the difference in the speed increase of each stage (△ Τ '2, * ·· △?' !!-1, ΛΤ'η) is less than the temperature of the previous stage Unnamed Page 16 416177_ VI. Patent application range When the difference is subtracted from the value of the set difference (X) in this level, the speed will be increased in order to the maximum speed of the motor (Npiuax). 2 · As described in item 1 of the scope of patent application, "a control method that can use electric power control to prevent overheating inside the motor", the operation process of its alarm unit is as follows: (1) When the detection value (TA) is greater than the first set temperature When the value (TS 1) is added to the set difference (X), the first-stage warning is issued by the alarm unit; (2) When the detected value (TA) is greater than the second set value (TS 2) plus the set coefficient (Y) When multiplying the value of the set difference (X), the alarm unit will issue a second stage warning, and the detection value (TA) will be greater than the set temperature value of each level (TS 3, TS η-1 ... TS η) plus When the setting coefficient (Υ) is multiplied by the value of the set difference (X), the warning unit will issue warnings in each stage in sequence, until the warning at the final stage is issued, the power-off protection unit will force the power-off action to stop the motor. . 3 · As described in item 1 of the patent application, "A control method that can use electric power control to prevent the motor from overheating", where the current can be listed as a control parameter, that is, when the current (A) is greater than the set current (AS) , The central processing unit outputs a control signal to the power-off protection unit to perform a forced power-off protector. 4 · As described in item 1 of the patent application, "a control method that can use electric power control to prevent the motor from overheating", in order to achieve early warning control of the motor aging degree, the control process is as follows: (1) Reading system Or the aging index value of the component, when its total value (Q t) is greater than the set value (Qs), the aging alarm is issued by the alarm unit. Unnamed page 17 VI. Patent application group (2) When aging means J until its 1 t ί Straight (Q t) is greater than the identified value (Q s) plus _ -j-π. Όχ fixed difference (Z) Hours &gt; Out of the central processing unit — control signals to the power control unit, alarm unit, power outage protection unit &gt; forcibly stop the power out &gt; and stop the disposal 〇 5-as described in the patent scope Plants 2 and 4-A control method that can use electric power control to prevent the internal rail of the motor from being overrun. J 7 Where the alarm OP Early warning is issued by the central processing unit and the aging index value is registered at the same time as aging. The judgement of the degree of judgement is 0. A protection device that can use electric power control to prevent the internal rail of the motor mainly includes a setting unit, a sensing unit, a central processing unit, an alarm unit, and a The power failure protection unit and an electric power control unit are one of them -i-fX. The Fenyou fixed unit has the function of m to a fixed value and the selection of the operating mode j-'' Sensing T39 early element 5 series contains Temperature sensing function with sensing element 9 Mainly use the sensing element to perform fixed-point temperature detection on the coils (or stator, housing) of the motor and transmit this detection value to the central processing unit} — Central Processing Unit It is a processing unit containing a control program, which is mainly based on the comparison between the input detection value and -in. E and a predetermined temperature value. A corresponding control signal is output to the power control unit, alarm unit and power failure protection unit » An alarm unit &gt; when the motor is unloaded and cooled down &gt; can be timely adjusted by the central processing unit according to the preset settings Alarm output views illustrating various stages of the inquiry number of warning issued actuator » Untitled Page 18 41β177_ Six 'patent application scope-power failure protection unit, when the temperature of the motor reaches a set upper limit, it receives a central processing unit control signal to force a power outage; a power control unit, based on the signal from the central processing unit In order to control the electric power input to the motor and thereby control the change of the rotation speed of the motor; the combination of the above-mentioned components enables the protection device to output a corresponding control signal to the electric power control unit according to the comparison result between the detection value and the set value, and timely control The timing of unloading is to control the speed change of the motor and effectively extend the service life of the motor. 7 · As described in item 6 of the scope of patent application, "a protection device that can use electric power control to prevent the motor from overheating", which allows this device to be connected to a central monitoring room, that is, the signal output by the central processing unit can be transmitted Those who go to the central monitoring room to monitor the operation of this device. 8. As described in item 6 of the scope of patent application, "a protection device that can use electric power control to prevent the motor from overheating", wherein the electric power control unit can be provided with a sensing element to detect its temperature. Untitled Page 19