JP6096633B2 - Water supply device and inverter for controlling synchronous motor for driving pump used therefor - Google Patents

Description

  The present invention relates to protection of a synchronous motor and a pump at a low temperature in a pump driven by a synchronous motor whose speed is controlled by an inverter or a water supply device using a plurality of pumps.

  As an antifreezing device for a pump, there are JP-A-2006-46151 (Patent Document 1) and JP-A-2012-172644 (Patent Document 2).

In Patent Document 1, when a temperature below a predetermined value is detected by a temperature sensor disposed in the vicinity of a pump chamber, an arbitrary stator winding is energized without rotating the rotor of a motor that drives the pump. Then, it is disclosed to output a control signal to the inverter circuit so as to generate heat.
Patent Document 2 also states that the temperature detected by the temperature detecting means provided in the water supply unit is not more than the first set value and the amount of water detected by the flow rate detecting means is not more than the first set flow rate. A method for preventing freezing of a water supply unit is disclosed in which a heating means for heat insulation is energized when a period is continued, and a portion assumed to be frozen is heated to a predetermined temperature.

JP 2006-46151 A JP 2012-172644 A

  In Patent Document 1 and Patent Document 2, it is necessary to provide a temperature sensor or temperature detection means in the vicinity of the pump chamber or in the water supply unit. However, the labor, reliability, and cost of attaching a temperature sensor to piping such as a pump chamber and a water supply unit are problems.

  On the other hand, the motor that drives the pump is controlled by an inverter. The inverter has a power switching element that is a heat generating element, and a temperature detector is provided for the purpose of monitoring and protecting the heat generation state. Therefore, considering the case where a temperature sensor is attached to the motor, it is necessary to provide a temperature detector for each of the motor and the inverter, and there are problems that the number of parts increases and the structure becomes complicated.

  The present invention has been made in view of the above circumstances, and has an object of protecting a synchronous motor and a pump in a low temperature state with a simple structure, and further continuing stable water supply.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present invention includes a plurality of means for solving the above-mentioned problems. For example, an inverter that controls a synchronous motor that rotationally drives a pump unit, and a housing that forms an outer periphery of an armature of the synchronous motor Is below a first predetermined temperature that is a temperature determination value at which reactive current starts to flow through the synchronous motor, the reactive current is passed through the synchronous motor to warm the motor, and the housing temperature is When the temperature is lower than a second predetermined temperature, which is a temperature determination value at which the heater provided at the end of the heater starts to operate, a signal for turning on the heater is output.

  According to the present invention, it is possible to heat a motor in a low temperature state to prevent demagnetization, and to prevent demagnetization and step-out of the motor due to freezing in the pump unit, and to perform stable water supply.

It is the figure which showed the external view with which the synchronous motor for pump drive and the inverter were united. FIG. 2 is a development view of a rotating electrical machine portion and an inverter in FIG. 1. It is a figure which shows the whole structure of the water supply apparatus of the present Example 1. It is a figure explaining the data content of the memory | storage part of the inverter of the present Examples 1-3. It is a main control flow of the first embodiment. It is a detailed control flow of the confirmation process of the temperature variation determination method of the first embodiment. It is a figure explaining the primary approximation of the temperature change with respect to elapsed time. 4 is a detailed control flow of inverter operation / stop processing according to the first and third embodiments. It is a detailed control flow of the electric motor heating process of the present Example 1. FIG. It is the first half part of the detailed control flow of the heater operation process of the first embodiment. It is the second half part of the detailed control flow of the heater operation process of the first embodiment. It is a figure which shows the whole structure of the water supply apparatus of the present Example 2. It is a main control flow of the second embodiment. It is a detailed control flow of the inverter operation / stop process of the second embodiment. It is the first half part of the detailed control flow of the freeze prevention pump driving | running | working process of the present Example 2. FIG. It is the second half part of the detailed control flow of the freeze prevention pump driving | operation process of the present Example 2. It is a figure which shows the whole structure of the water supply apparatus of the present Example 3. It is a figure explaining the data content of the memory | storage part of the control apparatus of the present Example 3. It is a figure which shows the content of the communication data from the inverter of a present Example 3 to a control apparatus. It is a figure which shows the content of the communication data from the control apparatus of the present Example 3 to an inverter. It is a figure which shows the main control flow of the present Example 3. It is a figure explaining the data content of the memory | storage part in the case of calculating automatically a temperature change determination value in the control apparatus of the present Example 3. It is a figure which shows the content of the communication data from a control apparatus in the case of performing the automatic setting of the temperature change determination value of the present Example 3. It is a control flow in the case of performing automatic setting of the temperature change determination value of the third embodiment.

Embodiments of the present invention will be described below with reference to the drawings.

  The first embodiment is a water supply apparatus using a pump driven by a synchronous motor whose speed is controlled by an inverter, wherein the inverter is attached to a part of a housing constituting the outer periphery of the armature of the synchronous motor, The temperature of the housing is detected using a temperature detector provided in the inverter. Then, the inverter detects the housing temperature using the temperature detector, and when the housing temperature falls below a first predetermined temperature (temperature at which the motor needs to be heated: temperature 1), an invalid current is supplied to the motor. When the temperature falls below the second predetermined temperature (temperature at which the heater must be operated to warm the pump: temperature 2), a signal to turn on the heater is output. It is. Heating the motor prevents demagnetization due to the starting current, and warms the pump unit to prevent demagnetization and step-out due to freezing.

First, the relationship between the synchronous motor and the inverter, which is a premise of the present embodiment, will be described. FIG. 1 is a diagram showing an external view in which a synchronous motor for driving a pump and an inverter are integrated.
In FIG. 1, 1 is a cover that covers the outer periphery of the synchronous motor main body, 2 is a cooling cover 2 that incorporates a centrifugal fan 25, which will be described later, and 3 is an inverter that will be described later, attached to the outer peripheral surface of the cover 1. 4 is a terminal box with a built-in noise filter, 5 is an end bracket, and 6 is a rotating shaft formed integrally with the rotor of the synchronous motor.

FIG. 2 is a development view of the rotating electric machine portion housed in the cover 1 and each portion of the inverter. In FIG. 2, 9 is a housing of a rotating electrical machine, and cooling fins 22 are formed on a part of the outer peripheral surface thereof. Although not shown in the figure, a stator and a rotor of a rotating electric machine are inserted inside the housing 9, and 24 is attached to the end of the housing 9 on the side opposite to the end bracket 5 described above. The end bracket 25 is a centrifugal fan attached to the rotating shaft 6 outside the end bracket 24. Further, the inverter 7 is attached to the flat surface 23 of the housing 9 through an opening 21 provided in a part of the cover 1, and then the cover 3 for protecting the inverter 7 is attached from the outside. Moreover, since the inverter has a power switching element or the like as a heat generating element, a temperature detector is provided for the purpose of monitoring and protecting the heat generation state. Reference numeral 26 denotes a control & I / F board case, and 27 denotes a smoothing capacitor case. And the cooling cover 2 mentioned above is attached to the other edge part (left end of a figure) of the housing 9. FIG. Moreover, the code | symbol 8 in a figure has shown the small hole in order to take in external air formed in the mesh shape in the approximate center part of the wall surface of the said cooling cover 2. FIG.
That is, the inverter 7 is directly attached to a part of the flat surface 23 of the housing 9 of the rotating electrical machine, and the inverter 7 is thermally integrated with a housing made of a material having excellent heat conductivity, It is possible to control the temperature of the inverter and the housing integrally with the temperature detector in FIG.

FIG. 3 is a diagram showing the overall configuration of the water supply apparatus. In FIG. 3, reference numeral 10 denotes a pump, which is driven by an electric motor indicated by 20. The inverter indicated by 30 is supplied with power from the power source side, and is driven by changing the rotation speed of the motor 20 by changing the frequency of the output current by the power converter indicated by reference numeral 32. Reference numeral 31 denotes an arithmetic processing unit that performs operation / stop of the motor 20 and changes in the rotation speed in accordance with a signal input from a signal input unit indicated by 34 in accordance with a control parameter stored in a storage unit indicated by 33.
61 is a heater provided on the pump suction side, and 62 is a heater provided on the pump discharge side. These heaters are preferably provided at both ends of the pump, but depending on the pump shape or piping shape, only the suction side or the discharge side of the pump may be provided. The heater has a shape attached to a connection portion (flange or the like) between the pump and the pipe and a shape wound around the pipe, but may have any shape.

  The signal input unit 34 of the inverter and the heaters 61 and 62 are connected by communication / control lines denoted by reference numerals 50-4 and 50-5, respectively, and exchange heater operation / stop signals.

  Next, the contents of the volatile memory and the nonvolatile memory stored in the storage unit 33 of the inverter 30 will be described.

  FIG. 4A shows the contents of the volatile memory, and FIG. 4B shows the contents of the nonvolatile memory. In addition, it does not have a memory | storage part inside an inverter, and it does not interfere even if it attaches a memory | storage device outside an inverter and substitutes.

In FIG. 4A, the current temperature TMP of the housing detected by the temperature detector in the inverter is stored at address 1000 of the volatile memory.
At the address 1202, if the setting method DGM of the temperature change determination value is 0: set value at the nonvolatile memory 3000 described later, the temperature change determination value TD2 for operating the heater at the nonvolatile memory 2202 is stored, and the DGM is stored. In the case of 1: data table or 2: automatic setting, the determination value determined or automatically set from the data table is stored.
Addresses 1211 and 1212 store the housing temperature DGA at the time when the determination is started and the housing temperature DGB at the time when the determination is completed, respectively, when the temperature change is determined.
When the temperature change determination is automatically set at address 1213, the temperature DGC before the start of the temperature change determination process is stored.
Address 1302 stores the remaining time TN2 of the timer for setting the time for temperature change determination.
Address 1304 stores a remaining time TN4 of a timer for setting a time for prohibiting operation until the motor is heated and there is no risk of demagnetization after detecting a low temperature and starting to flow a reactive current to the motor. After detecting the low temperature and starting to operate the heater at the address, the remaining time TN5 of the timer for setting the time to prohibit the operation until the pump unit is heated and there is no fear of demagnetization or step-out is stored.
After the low temperature is detected at address 1306 and the reactive current starts to flow to the motor, the remaining time TN6 of the timer for setting the time for which the reactive current continues to flow is stored, and the heater is operated by detecting the low temperature at address 1307. After starting, the remaining time TN7 of the timer for setting the time for which the heater is kept on is stored.

Further, in FIG. 4B, a temperature determination value (temperature 1) TP1 at which the reactive current starts to flow through the motor is stored in advance at address 2101.
A temperature determination value (temperature 2) TP2 at which the heater is started to be operated is stored in advance at address 2102.
A temperature determination value (temperature 4) TP4 for stopping the flow of reactive current to the motor is stored in advance at address 2104.
A temperature judgment value (temperature 5) TP5 for stopping the operation of the pump is stored in advance at address 2105.
In the address 2202, a value TD2 to be referred to as a temperature change determination value for operating the heater is stored in advance when the temperature change determination value setting method DGM is set to 0: set value in the non-volatile memory 3000 described later. Keep it.
In the address 2302, a temperature change determination confirmation time TM2 is stored in advance.
At address 2304, after a low temperature is detected and a reactive current starts to flow through the motor, a time TM4 during which the operation is prohibited until the motor is heated and there is no risk of demagnetization is stored in advance.
At address 2305, after the low temperature is detected and the heater is started to operate, a time TM5 for prohibiting the operation is stored in advance until the pump unit is heated and there is no fear of demagnetization or step-out.
At time 2306, after detecting a low temperature and starting to supply a reactive current to the motor, a time TM6 during which the reactive current continues to flow is stored in advance.
At time 2307, after detecting a low temperature and starting to operate the heater, a time TM7 for which the heater is kept on is stored in advance.
A temperature change determination value setting method DGM is set at address 3000. When DGM is 0 (set value), TD2 stored at the address 2202 as the temperature change determination value is stored as DG2 at the volatile memory 1202, and when the DGM is 1 (data table), the nonvolatile memory 3001 is stored. The temperature change determination value is calculated using the address 3307 from the address, and the result is stored in the volatile memory 1202 as DG2. Details will be described in the control flow. A case where DGM is 2 (automatic setting) will also be described in a later-described control flow.

  In addition, the above description was only about the part used by a present Example. Other parts not described above will be described later when used in other embodiments.

  Next, the control flow of the present embodiment will be described with reference to FIG.

  FIG. 5 is a main control flow of this embodiment. In step 100, each control parameter is read / written as an initialization process. In step 120, the temperature change amount determination method is checked, and the temperature change amount determination values DG2 and DG3 at the volatile memory addresses 1202 and 1203 are stored according to the processing result. The operation / stop state is changed in 130 steps. In step 131, the current housing temperature is confirmed. In step 140, the motor heating process is performed. In step 150, the heater operation process is performed.

  Next, details of the confirmation process of the temperature change determination method in 120 steps will be described with reference to FIG.

  In FIG. 6, first, the temperature change determination method selection DGM stored in advance in the non-volatile memory 3000 is confirmed in step 200. If DGM is set to 0, manual setting is performed. That is, the determination reference value is set manually, and the temperature change amount determination value TD2 for heater operation stored in advance at address 2202 in step 211 is read and stored as the determination reference value in DG2 of the volatile memory 1202. , 212, and the temperature change amount determination value TD3 for the pump operation stored in advance at address 2203 is read out and stored as a determination reference value in DG3 at address volatile memory 1203, and the process proceeds to step 130 in FIG.

  When DGM is set to 1, the data table is set. That is, the thermal time constant is selected in 220 steps. When the time constant selection DT1 stored in advance in the nonvolatile memory 3201 is confirmed and 1 is set, it corresponds to the thermal time constant selection 1 stored in advance in the address 3301 in step 221. The constant DC1 is set as a constant HR1. When DT1 is set to 2, the constant DC2 corresponding to the thermal time constant selection 2 stored in advance at address 3302 in step 222 is set as the constant HR1. Similarly, when DT1 is set to 6, the constant DC6 corresponding to the thermal time constant selection 6 stored in advance at address 3306 in step 226 is set as the constant HR1.

The amount of change in temperature with respect to the elapsed time is expressed by a curve that changes according to the time constant as shown in FIG. Since the temperature change is proportional to the temperature difference and inversely proportional to the thermal time constant (reciprocal of the heat capacity), for example, when determining the heater operation determination value, the heater operation temperature determination value TD2, 3001 of the non-volatile memory 2102 The reference value HGB, the reference thermal time constant HRB at address 3002, and the selected thermal time constant HR1 are used to obtain the determination value DG2 by the equation (1).

DG2 = TD2 × (DGA ÷ HGB) × (HR1 ÷ HRB) (1)

And it memorize | stores in DG2 of the volatile memory 1202 as a determination reference value.
Similarly, when determining the determination value of the pump operation, the determination value DG3 is determined by the equation (2) using the temperature determination value TD3 of the pump operation at the non-volatile memory 2103.

DG3 = TD3 × (DGA ÷ HGB) × (HR1 ÷ HRB) (2)

And it memorize | stores in DG3 of the volatile memory 1203 address as a judgment reference value. After calculating and storing the temperature change amount determination value in step 228, the process proceeds to step 130 in FIG.

  For steps 220 to 228, if a value other than 0 is stored in the thermal time constant HR1 of the non-volatile memory 3101 without calculating each time the temperature change determination value is confirmed, It is only necessary to proceed to 130 steps without performing the calculation. Further, the control parameter of HR1 may be set directly, and fine adjustment may be made according to the actual temperature change.

When DGM is set to 2, it is automatically set. That is, the current temperature TMP is stored as DGC at address 1213 of the volatile memory in step 231 and then the motor is heated for the set time of the timer 6 in step 232. In step 233, the temperature TMP is stored as DGA at address 1211 of the volatile memory, and then in step 234, heating is stopped for the set time of the timer 2 and cooling is performed. After the temperature TMP is stored as DGB at address 1212 of the volatile memory in step 235, for example, when determining a determination value for heater operation, determination value DG2 is obtained from TP2 at address 2102 of the nonvolatile memory and DGA, DGB, and DGC. Is obtained by equation (3).
DG2 = (DGA-DGB) × (DGA-TP2) × (DGA-DGC) (3)

And it memorize | stores in DG2 of the volatile memory 1202 as a determination reference value. Similarly, when determining the determination value of the pump operation, the determination value DG3 is determined by Expression (4) using TP3 at address 2103 of the nonvolatile memory.

DG3 = (DGA-DGB) × (DGA-TP3) × (DGA-DGC) (4)

And it memorize | stores in DG3 of the volatile memory 1203 address as a judgment reference value. After calculating and storing the temperature change judgment value in step 236, the process proceeds to step 130 in FIG.

  In addition, from step 231 to step 236, the calculation result of the first time is stored in the determination values TD2 and TD3 of the nonvolatile memory addresses 2202 and 2203 without calculating each time the temperature change determination value is confirmed. Thereafter, when values other than 0 are stored as TD2 and TD3, it is only necessary to proceed to step 130 without performing calculation.

  When the pump part is easier to cool than the housing, the pump part may be lowered to a temperature that requires operation even if the housing is not lowered to a temperature that requires heater operation or pump operation. By determining the temperature change amount determination value in this way, the outside air temperature is calculated from the temperature change of the housing, and the outside air temperature is estimated, so that the estimated outside air temperature is a temperature at which the pump part may be frozen. In such a case, the heater or pump is operated to prevent freezing, and step-out and demagnetization can be prevented.

  Next, details of the 130-step inverter operation / stop process in FIG. 5 will be described with reference to FIG.

In FIG. 8, when an operation command is input in step 300, the process proceeds to step 320, where it is confirmed whether it is not the motor operation prohibition time (not counting the timer 4) during the heating of the motor. If it is not the prohibited time, the process proceeds to 330 step. In 330 step, it is confirmed whether it is not the motor operation prohibition time (not counting the timer 5) during the heater operation. If it is not the operation prohibition time, the pump operation is started in 331 step. Go to step 131 in step 5.
If the operation prohibition time is reached in either 320 steps or 330 steps, the operation proceeds to step 131 in FIG. 5 without starting the pump operation.
If no operation command is input in step 300 and a stop command is input in step 310, the pump operation is stopped in step 341 and the process proceeds to step 131 in FIG. If no stop command is input, the process proceeds to step 131 in FIG. 5 without doing anything.

  In addition, when the motor temperature is lower than the temperature judgment value TP1 for heating the motor, the reactive current is caused to flow to the motor when the motor temperature is lower than the temperature judgment value TP1 for heating the motor. The operation is not permitted until the housing temperature reaches the temperature judgment value TP4 for stopping the operation.

  Further, similarly to not permitting operation during the motor operation prohibition time during the operation of the heater, when the housing temperature falls below the temperature determination value TP2 for operating the heater, the temperature determination value for stopping the pump operation The operation is not permitted until the housing temperature reaches TP5. The above process is to prevent the pump life from being shortened by repeating the operation and stop of the motor many times in a short time.

  Next, details of the 140-step motor heating process in FIG. 5 will be described with reference to FIG.

  In FIG. 9, when the motor is not in the warming operation in 400 steps, the timer 6 is stopped in 401 steps, and the current temperature TMP of the volatile memory 1000 is stored in advance in the nonvolatile memory 2101 in 402 steps. It is confirmed whether or not the temperature determination value TP1 for heating the motor that has been heated is equal to or greater than TP1. Proceed to

  If TMP is less than TP1 in step 402, that is, if the housing temperature is lower than the first predetermined temperature, it is determined that heating is necessary, and heating of the motor is started in step 431, and step 432 In step 433, the motor operating prohibition time timer TM4 set value is stored in advance in the non-volatile memory 2304 and the set value of the motor operation inhibition time timer TM4 is stored in the timer 4 remaining in the volatile memory 1304. Store at time TN4 and start counting down TN4. In step 434, the set value of the timer setting timer TM6 for warming the motor previously stored in the nonvolatile memory 2306 is stored in the timer 6 remaining time TN6 of the volatile memory 1306, and the countdown of TN6 is started. Proceed to step 150 in FIG.

When the motor is in the warming operation in 400 steps, if the count of TN6 is not completed in 440 steps, the process proceeds to step 150 in FIG. 5 without doing anything.
When the TN6 count is completed, the motor heating is stopped in step 441, the motor heating in the operating state is canceled in step 442 (the corresponding bit is set to 0), and the timer 4 is stopped in step 443. In step 444, the timer 6 is stopped and the process proceeds to step 150 in FIG.

  Next, details of the 150-step heater operation process of FIG. 5 will be described with reference to FIG.

  Although FIG. 10 is divided into FIG. 10A and FIG. 10B for the sake of space, it is continuous with reference numerals A, B, and C. In the following description, FIG. 10A and FIG. 10B are collectively described as FIG. In FIG. 10, when the heater is not operating in 500 steps, the timer 7 is stopped in 501 steps, and the current temperature TMP of the volatile memory 1000 is stored in advance in the nonvolatile memory 2102 in 502 steps. It is confirmed whether or not the temperature judgment value TP2 or more for operating the heater is exceeded. If TMP is TP2 or more, it is confirmed whether or not the timer 2 for judging the temperature change of the heater is stopped. In step 511, the current temperature TMP is stored in the volatile memory 1211 as the temperature DGA at the start of temperature change determination, and the motor temperature change stored in advance in the non-volatile memory 2302 in step 512. Stores the set value of judgment timer TM2 in timer 2 remaining time TN2 at volatile memory 1302, and counts down TN2 It started, the flow returns to 120 steps in FIG.

  If the timer 2 is not stopped in step 510, it is checked in step 520 whether the timer 2 is counting. If it is counting, the processing returns to step 120 in FIG. 5 without doing anything.

  If the timer 2 is not counting in step 520, the current temperature TMP is stored in the volatile memory address 1212 as the temperature DGB at the start of temperature change determination in step 521, and the timer 2 is stopped in step 522. In step 530, the difference between DGA and DGB is confirmed, and if the difference between DGA and DGB, which is the amount of temperature change, is less than DG2 stored in the volatile memory 1202, no action is taken. Return to step.

  If TMP is less than TP2 in step 502, that is, if the housing temperature is below the second predetermined temperature, and if the difference between DGA and DGB is greater than or equal to DG2 in step 530, that is, the second When the predetermined temperature change amount is exceeded, it is determined that the heater needs to be operated, the heater operation is started at step 533, the operation state is changed to the heater operation at 532 step, and the nonvolatile memory 2305 is set at 533 step. The set value of the motor operation prohibition time timer TM5 during the heater operation stored in advance at the address is stored in the timer 5 remaining time TN5 of the volatile memory 1305, and the countdown of TN5 is started. In step 534, the setting value of the timer setting timer TM7 for operating the heater previously stored in the non-volatile memory 2307 is stored in the timer 7 remaining time TN7 of the volatile memory 1307, and the countdown of TN7 is started. Returning to step 120 in FIG.

  If the heater is operating in 500 steps, the timer 2 is stopped in 502 steps, and if the TN7 count is not completed in 540 steps, the process returns to 120 steps in FIG. 5 without doing anything.

  When the counting of TN7 is completed, the heater operation is stopped in step 541, the heater operation in the operation state is canceled in step 542 (corresponding bit is set to 0), the timer 5 is stopped in step 543, In step 544, the timer 7 is stopped and the process returns to step 120.

  As described above, in this embodiment, the inverter is attached to a part of the housing of the synchronous motor, and the housing temperature is detected using the temperature detector provided in the inverter. When the temperature falls below the first predetermined temperature, a reactive current is supplied to the motor to heat it, and when the temperature falls below the second predetermined temperature, the heater provided at the end of the pump is turned on. Output a signal. This eliminates the trouble of attaching a temperature sensor to the piping, reliability, and the problem of increased cost, and it is not necessary to provide a temperature detector for each of the motor and the inverter, the number of parts is small, the structure is simple, Heating the motor prevents demagnetization due to the starting current, and warming the pump can prevent demagnetization and step-out due to freezing, protecting the synchronous motor and pump in a low temperature state, and stable It becomes possible to continue water supply. Further, energy can be saved by not operating the heater excessively.

  In the second embodiment, similarly to the first embodiment, in a water supply apparatus using a pump driven by a synchronous motor whose speed is controlled by an inverter, the inverter is one of the housings constituting the outer periphery of the armature of the synchronous motor. The temperature of the housing is detected by using a temperature detector provided in the inverter. When the housing temperature is detected using the temperature detector and the housing temperature falls below a third predetermined temperature (temperature at which the pump needs to be operated to prevent freezing: temperature 3), The pump is operated. By continuing to operate the pump, water is prevented from freezing, and at the same time, the motor is started at a higher temperature than the water freezes to prevent demagnetization of the motor.

  Hereinafter, it demonstrates using drawing. FIG. 11 shows the overall configuration of this embodiment. The configuration is almost the same as that of the first embodiment, and the heaters 61 and 62, the signal input unit 34, and the communication / control lines 50-4 and 50-5 of the first embodiment are not necessary.

  The contents of the volatile memory and the nonvolatile memory stored in the storage unit 33 of the inverter 30 in this embodiment will be described with reference to FIG. In addition, it does not have a memory | storage part inside an inverter, and it does not interfere even if it attaches a memory | storage device outside an inverter and substitutes. Since the content is almost the same as that of the first embodiment, only the differences will be described.

In FIG. 4A, at the address 1203, the temperature change determination value for operating the heater at the nonvolatile memory 2203 is set at a temperature change determination value setting method DGM 0 at a nonvolatile memory 3000 described later. When TD3 is stored and DGM is 1: data table or 2: automatic setting, a determination value determined or automatically set from the data table is stored.
Address 1303 stores the remaining time TN3 of the timer for setting the time for temperature change determination.
Address 1308 stores a remaining time TN8 of a timer for setting a time during which the operation of the electric motor is continued after detecting the low temperature and starting the electric motor.

In FIG. 4B, address 2001 indicates the pump operation speed (rotational speed of the motor) HzC at the time of low temperature detection. By continuing the operation at a low speed of HzC, the water in the pump section and in the front and rear pipes are prevented from freezing.
At temperature 2103, a temperature judgment value (temperature 3) TP3 at which the pump is started is stored in advance. A temperature determination value (temperature 6) TP6 for stopping the operation of the pump is stored in advance at address 2106.
In the address 2203, when the temperature change determination value setting method DGM is set to 0: a non-volatile memory 3000 described later, when the set value is set, a value TD3 to be referred to as a temperature change determination value for operating the pump is stored in advance. Keep it.
At the address 2303, a confirmation time TM3 for temperature change determination is stored in advance.
At time 2308, after the low temperature is detected and the motor is started to operate, the time TM8 during which the motor continues to be operated is stored in advance.

  A temperature change determination value setting method DGM is set at address 3000. When DGM is 0 (set value), TD3 stored at the address 2203 as the temperature change determination value is stored as DG3 at the volatile memory 1203, and when the DGM is 1 (data table), the nonvolatile memory 3001 is stored. The temperature change determination value is calculated using the address 3307 from the address, and the result is stored as DG3 in the volatile memory 1203. Details are the same as the control flow of the first embodiment. The details of the case where DGM is 2 (automatic setting) are the same as the control flow of the first embodiment.

  Next, the control flow of the present embodiment will be described with reference to FIG.

  FIG. 12 is a main control flow of this embodiment. In step 100-2, each control parameter is read / written as an initialization process. In step 120-2, the temperature change amount determination method is checked, and the temperature change amount determination values DG2 and DG3 at the volatile memory addresses 1202 and 1203 are stored according to the processing result. The operation / stop state is changed in step 130-2. In step 131-2, the current housing temperature is confirmed. In step 160, antifreezing pump operation processing is performed, and the process returns to step 120-2.

  Since the confirmation process of the temperature change amount determination method in step 120-2 is the same as that of the first embodiment, the description thereof is omitted.

  Next, details of the 130-2 step inverter operation / stop process will be described with reference to FIG.

In FIG. 13, when an operation command is input in step 300-2, the pump starts operating in step 312-2, and proceeds to step 131-2 in FIG.
If no operation command is input at step 300-2 and a stop command is input at step 310-2, it is not the freeze prevention operation time when the pump is at a low temperature at step 340-2 (during timer 8 counting). If it is not during the freeze prevention operation, the process proceeds to step 341-2. The operation of the pump is stopped in step 341-2, and the process proceeds to step 131-2 in FIG. If no stop command is input, or if the pump is in a freeze prevention operation, the operation proceeds to step 131-2 in FIG. 12 without doing anything.

Next, details of the 160-step freeze pump operation processing will be described with reference to FIG.
FIG. 14 is divided into FIG. 14A and FIG. 14B for the sake of space, but is continuous with reference numerals A, B, and C. In the following description, FIG. 14A and FIG. 14B are described together as FIG.

  In FIG. 14, when the pump is not in the freeze prevention operation in step 600, the timer 8 is stopped in step 601 and the current temperature TMP of the volatile memory 1000 is stored in advance in the nonvolatile memory 2103 in step 602. It is confirmed whether or not the temperature judgment value TP3 for operating the pump has been exceeded, and if TMP is TP3 or more, it is confirmed whether or not the timer 3 for judging temperature change of the pump is stopped. If it is stopped, the current temperature TMP is stored in the volatile memory 1211 as the temperature DGA at the start of temperature change determination in step 611, and the pump stored in advance in the non-volatile memory 2303 in step 612 Is stored in the timer 3 remaining time TN3 of the volatile memory 1303, and the TN3 counter Starts down, it returns to 120-2 step of FIG.

  If the timer 3 is not stopped in step 610, it is checked in step 620 whether the timer 3 is counting. If it is counting, the processing returns to step 120-2 in FIG. 12 without doing anything.

  If the timer 3 is not counting in step 620, the current temperature TMP is stored in the volatile memory 1212 as the temperature DGB at the start of temperature change determination in step 621, and the timer 3 is stopped in step 622. In step 630, the difference between DGA and DGB is confirmed, and if the difference between the DGA and DGB, which is the temperature change amount, is less than DG3 stored in the volatile memory 1203, nothing is done. -Return to step-2.

  If TMP is less than TP3 in step 602, i.e., if the housing temperature is below the third predetermined temperature, and if the difference between DGA and DGB is greater than or equal to DG3 in step 630, i.e., the third If the predetermined temperature change amount is exceeded, it is determined that the pump freeze prevention operation is necessary, the pump freeze prevention operation is started in step 631, the operation state is changed to the freeze prevention operation in step 632, and step 634 Stores the set value of the timer TM8 for time setting for preventing freezing operation of the pump previously stored in the nonvolatile memory 2308 in the timer 8 remaining time TN8 of the volatile memory 1308, and starts the countdown of TN8. Returning to step 120-2 in FIG.

  Although not shown in FIG. 14, when the housing temperature falls below the third predetermined temperature, after the determination at step 602, the motor is turned on before starting the anti-freezing operation of the pump at step 631. Whether the temperature does not fall below the first predetermined temperature that is the temperature determination value TP1 at which the reactive current starts to flow, or the second predetermined temperature that is the temperature determination value TP2 at which the heater needs to be operated to warm the pump unit Add a decision and if it is below either, do not let the motor run. This is a temperature at which the motor is demagnetized when the motor is operated when the temperature is lower than the first predetermined temperature, and the motor is demagnetized by trying to operate the motor. This is to prevent this. In addition, when the temperature is lower than the second predetermined temperature, the temperature inside the pump may be frozen, so the pump casing may be frozen and cannot be operated. It is.

If the pump is in anti-freezing operation at 600 steps, the timer 3 is stopped at 602 steps, and if the count of TN8 is not completed at 640 steps, nothing is done and the steps 120-2 in FIG. Return to.
When the TN8 count is completed, the freeze prevention operation of the pump is stopped at 641 step, the freeze prevention operation state is released at 642 step (the corresponding bit is set to 0), and the timer 8 is stopped at 644 step. Return to step 120-2 in FIG.

  As described above, according to this embodiment, the inverter is attached to a part of the housing of the synchronous motor, and the housing temperature is detected using the temperature detector provided in the inverter. The pump is operated when the housing temperature falls below a third predetermined temperature (temperature at which the pump must be operated to prevent freezing: temperature 3). By continuing to operate the pump, water can be prevented from freezing, and at the same time, the motor can be prevented from demagnetizing by starting the motor at a higher temperature than the water freezes. That is, freezing can be prevented by operating the pump.

  Note that Example 1 and Example 2 may be combined. When Example 1 and Example 2 are combined, the set value of temperature 3 (temperature at which the pump needs to be operated to prevent freezing) is set to temperature 1 (temperature at which the motor needs to be warmed), temperature 2 (pump) The temperature is set higher than the temperature at which the heater needs to be operated to warm the part), so it seems that the pump only operates to prevent freezing, but when the power is cut off due to a power failure or maintenance. There is a possibility that the temperature drops to the temperature 1 and the temperature 2. By combining the first embodiment and the second embodiment, it is possible to cope with the case where the temperature is lowered while the power is shut off.

  In this third embodiment, in the water supply apparatus using a plurality of pumps driven by a plurality of synchronous motors whose speed is controlled by a plurality of inverters, as in the first embodiment, the inverter is an outer periphery of the armature of the synchronous motor. The temperature of the housing is detected using a temperature detector provided in the inverter. Each inverter detects the housing temperature using a temperature detector, and is invalid for the motor when the housing temperature falls below a first predetermined temperature (temperature at which the motor needs to be heated: temperature 1). When the temperature is lowered by passing an electric current and the temperature falls below a second predetermined temperature (temperature at which the heater needs to be operated to warm the pump section: temperature 2), a control device is used to turn on the heater power. Is output.

  In the third embodiment, the first embodiment is efficiently applied to the water supply device.

Hereinafter, it demonstrates using drawing. FIG. 15 shows the overall configuration of this embodiment. In FIG. 15, 10-1, 10-2, and 10-3 indicate pumps and are driven by electric motors indicated by 20-1, 20-2, and 20-3. Here, for the sake of convenience, the number 1 pump, the number 2 pump, the number 3 pump, and the number 1 motor, the number 2 motor, and the number 3 motor are referred to from the smaller number. The suction side of these pumps is connected to the water source side via a suction pipe denoted by 11. The water source side receives water from a water main (not shown) in the direct connection system, and receives water from a water receiving tank (not shown) in the water receiving tank system. 12-1, 12-2, 12-3, 14-1, 14-2, 14-3 are gate valves, 13-1, 13-2, 13-3 are check valves, and 15 is a water supply pipe. Reference numeral 17 denotes a pressure detection means which is provided in the water supply pipe 15 and generates an electrical signal in accordance with the pressure here. Based on the detection value of the pressure detection means, the pump discharge pressure is controlled (for example, discharge pressure constant control, estimated terminal pressure constant control). Further, as the demand side, when the end of the water supply pipe 15 terminal is a direct feed type, it is connected to the demand side water supply pipe to supply water to a faucet of an apartment house, for example. In the case of a high water tank type, it is connected to this demand side water supply pipe to supply water to the high water tank. Reference numeral 18 denotes a pressure tank provided in the water supply pipe 15 for suppressing rapid pressure fluctuations.
The No. 1 inverter, No. 2 inverter, No. 3 inverter indicated by 30-1, 30-2, and 30-3 are supplied with power from the power source side, and the electric power indicated by 32-1, 32-2, and 32-3, respectively. By changing the frequency of the output current by the conversion device, the rotational speeds of the electric motors 20-1, 20-2, 20-3 are changed and driven. Reference numerals 31-1, 31-2, and 31-3 denote arithmetic processing units, and 34-1, 34-2, and 34 according to the control parameters stored in the storage units indicated by 33-1, 33-2, and 33-3. The motors 20-1, 20-2, 20-3 are operated / stopped and the rotational speed is changed according to the signal input from the signal input unit indicated by -3.

  Reference numeral 40 denotes a control device that manages the number of operating pumps through the inverters 30-1, 30-2, and 30-3. An arithmetic processing unit 42 manages the number of operating pumps according to a signal input from a signal input unit 44 according to a control parameter stored in a storage unit 43. The control device 40 and the inverters 30-1, 30-2, 30-3 are connected by communication / control lines indicated by 50-1, 50-2, 50-3, respectively, and the control device 40 and the inverters 30-1, 30- 2, exchanges signals necessary for the control of 30-3.

  61 is a heater provided on the pump suction side, and 62 is a heater provided on the pump discharge side. It is desirable to be at both ends of the pump, but depending on the pump shape or piping shape, only the suction side or the discharge side of the pump may be used. The heater has a shape attached to a connection portion (flange or the like) between the pump and the pipe and a shape wound around the pipe, but may have any shape.

  The signal input unit 44 of the control device and the heaters 61 and 62 are connected by communication / control lines indicated by 50-4 and 50-5, respectively, and exchange heater operation / stop signals.

  Next, the contents of the volatile memory and the contents of the nonvolatile memory stored in the storage units 33-1, 33-2, and 33-3 of the inverters 30-1, 30-2, and 30-3 in the present embodiment. This will be described with reference to FIG. In addition, it does not have a memory | storage part inside an inverter, and it does not interfere even if it attaches a memory | storage device outside an inverter and substitutes. Further, since the content is almost the same as that of the first embodiment, only the differences will be described.

In FIG. 4A, the current operating state PN is stored at address 1001 of the volatile memory.
In order to store a plurality of operating states with one variable, for example, each bit of the PN variable is assigned to each state, the first bit is stopped at High, the second bit is operating at High, and the third bit is High Thus, it is good to store such that the motor is warming, the fourth bit is high and the heater is operating, and the fifth bit is high and the operation is to prevent freezing. Thus, if PN is 1, it is stopped, if PN is 2, it is operating, if PN is 4, the motor is warming, if PN is 12 (= 4 + 8), the motor is warming and the heater is operating, It can be judged that.
In FIG. 4B, the pump machine number NO is stored in advance at address 2000 of the nonvolatile memory. When the control device and the inverter communicate with one-to-many multi-connection, the control device is used to distinguish the inverter. This is not necessary when the control device and the inverter are connected in a 1: 1 ratio.

  Next, the contents of the volatile memory and the contents of the nonvolatile memory stored in the storage unit 43 of the control device 40 will be described with reference to FIG. FIG. 16A shows the contents of the volatile memory, and FIG. 16B shows the contents of the nonvolatile memory. It should be noted that a storage device may not be provided inside the control device, and a storage device may be attached outside the control device and used instead.

In FIG. 16A, the currently stopped pump number SNO is stored at address 1101. In order to store the status of multiple pumps with one variable, for example, each bit of the SNO variable is assigned to each status. The first bit is High and the Unit 1 pump is stopped. The second bit is High and the Unit 2 pump is stopped. It is better to memorize such that the third bit is High and the Unit 3 pump is stopped. Thus, if SNO is 1, the Unit 1 pump is stopped, if SNO is 2, the Unit 2 pump is stopped, and if PN is 3 (= 1 + 2), the Unit 1 pump and the Unit 2 pump are stopped. I can judge.
Similarly, at 1102 the pump number RNO currently being operated is indicated by each bit.
At 1103, the pump number DNO that is currently heating the motor is indicated by each bit.
At address 1104, the pump number HNO currently being operated by the heater is stored in each bit.

  In FIG. 16B, the pump machine number NO is stored in advance at address 2000 of the nonvolatile memory. The machine number of the control device is 0. When the communication is performed with the inverter in a 1: multi connection, the control device is used to distinguish the inverter. This is not necessary when the control device and the inverter are connected in a 1: 1 ratio.

  The number of water supply pumps PNUM is stored in advance at address 2002 of the nonvolatile memory. The control device communicates with the inverter of the machine number from 1 to the value set in PNUM and controls the inverter.

  Next, communication data will be described.

  FIG. 17 shows an example of communication data transmitted from the inverter to the control device via the communication / control lines 50-1, 50-2, 50-3. Instead of communication, the same number of analog signal lines or digital signal lines as the number of data may be prepared, and data may be exchanged by analog signal line voltage or current, or digital signal line High / Low.

  In FIG. 17, a bit string STA for starting communication is first transmitted from the inverter. Next, it is necessary to operate the transmission source machine number (own pump number) NO, transmission destination machine number (“0” indicating the control device) TO, current operation state PN, current temperature TMP, and heater. Send a driving instruction HRD (HRD is 0, driving is not required, HRD is 1, driving is required) to give instructions in some cases, and a specific calculation formula to confirm that these data are correctly transmitted The checksum value CRC of the calculated data is transmitted, and finally the bit string STP for communication termination is transmitted. The control device can determine whether or not the data has been received correctly by comparing the checksum value calculated from the received data using a specific calculation formula with the received checksum value CRC.

  FIG. 18 shows an example of communication data transmitted from the control device to the inverter via the communication / control lines 50-1, 50-2, 50-3.

In FIG. 18, the control device first transmits a bit string STA for starting communication. Next, send the source machine number (“0” indicating the control device) NO, the destination machine number (pump machine number) TO, and the operation / stop instruction DRC, and confirm that these data have been sent correctly. A checksum value CRC of the data calculated using a specific calculation formula for confirmation is transmitted, and finally a bit string STP for communication termination is transmitted. The inverter can determine whether or not the data has been received correctly by comparing the checksum value calculated from the received data using a specific calculation formula with the received checksum value CRC.
The control device stores the operation state of each inverter from the volatile memory addresses 1101 to 1103 based on the current operation state sent from the inverter.
When the operation / stop instruction DRC is 0, the inverter stops the electric motor. When the operation / stop instruction DRC is 1, the inverter operates the electric motor, and changes the rotation speed of the electric motor so as to reach a preset target discharge-side pressure. In this embodiment, detailed description of pressure control is omitted.

  Next, the control flow of the present embodiment will be described with reference to FIG.

  FIG. 19 is a main control flow of the third embodiment. In FIG. 19, in step 100-3, each control parameter is read / written as initialization processing. In step 120-3, the temperature change amount determination method is checked, and the temperature change amount determination values DG2 and DG3 at the volatile memory addresses 1202 and 1203 are stored according to the processing result. In step 121, communication is performed from the control device to each inverter. In step 122, each inverter communicates with the control device. The inverter receives the communication content from the control device in step 121, and changes the operation / stop state in step 130-3. The control device receives the communication content from each inverter in 122 steps, grasps the current operating state of each inverter, and stores it in the corresponding number in the volatile memory. When there is a heater operation instruction, the control device turns on the heater. The inverter confirms the current housing temperature in step 131-3, performs motor heating processing in step 140-3, the controller performs heater operation processing in step 150-3, and returns to step 120-3. The details of each control process are the same as those in the first embodiment, and thus the description thereof is omitted.

As described above, according to the present embodiment, the pump can be started immediately by warming the motor or operating the heater before the temperature becomes low, so that the pump can be started immediately when water supply is required. It can be activated. As a result, stable water supply can be performed even at low temperatures.
Moreover, it becomes possible to set the automatic setting of the temperature change determination value more accurately by using the control device. This will be described below.

  FIG. 20 shows the contents of the volatile memory and the nonvolatile memory stored in the storage unit of the control device when the temperature change determination value is automatically set more accurately. FIG. 20A shows the contents of the volatile memory, and FIG. 20B shows the contents of the nonvolatile memory. Differences from the above-described embodiment will be described.

In FIG. 20A, the housing temperature of the electric motor having the lowest housing temperature among the electric motors is stored at address 1100 of the volatile memory.
Addresses 1111 and 1112 store the housing temperature AA1 of Unit 1 when the determination is started and the housing temperature AB1 of Unit 1 when the determination is completed, respectively.
Addresses 1121 and 1122 store the housing temperature AA2 of Unit 2 when the determination is started and the housing temperature AB2 of Unit 2 when the determination is completed, respectively.
Addresses 1131 and 1132 store the housing temperature AA3 of the No. 3 machine when the determination is started and the housing temperature AB3 of the No. 3 machine when the determination is completed, respectively.
Other memory contents are the same as the memory contents of the previous embodiment or the inverter of the same address.

  FIG. 21 shows an example of communication data transmitted from the control device to the inverter via the communication / control lines 50-1, 50-2, 50-3 when the temperature change determination value is automatically set more accurately. Show.

  In FIG. 21, the difference from the above-described embodiment is that a CMD indicating communication contents is added to the fourth of the data. When CMD is 0, as in the previous embodiment, the next data (fifth data) means an operation / stop instruction. When CMD is 2, it means that the temperature change determination value (determination value 2) of the heater operation is transmitted to each inverter, and the next data (fifth data) is the determination value 2. When CMD is 3, it means that the temperature change determination value (determination value 3) of the pump operation is transmitted to each inverter, and the next data (fifth data) is the determination value 3.

  FIG. 22 shows a control flow in the case where the temperature change determination value is automatically set more accurately.

  In FIG. 22, in step 700, the electric motor to be heated is selected and confirmed. When selecting No. 1, the No. 1 motor starts to be heated in step 701. When selecting No. 2, the No. 2 unit is selected. Start heating of Unit 2 motor. Similarly, when selecting No. 3, the heating of No. 3 motor is started in step 703.

  After the motor is heated, the current temperature TMP sent from the No. 1 inverter in Step 711 is set as the temperature AA1 at the start of the temperature change determination of No. 1 and address 1111 of the volatile memory shown in FIG. In addition, the current temperature TMP sent from the No. 2 inverter is set to the address 1121 of the volatile memory as the temperature AA2 at the start of the temperature change determination of No. 2 and the current temperature TMP sent from the No. 3 inverter is similarly used. The temperature AA3 at the start of the temperature change determination of the No. 3 machine is stored at address 1131 of the volatile memory. In step 712, heating is stopped and cooled for a set time (TM2) of timer 2.

  After the motor is cooled, the current temperature TMP sent from the No. 1 inverter in step 713 is sent from the No. 2 inverter to the address 1112 of the volatile memory as the temperature AB1 at the end of the temperature change judgment of the No. 1 unit. The current temperature TMP is sent to the address 1122 of the volatile memory as the temperature AB2 at the end of the temperature change determination of the second unit, and the current temperature TMP sent from the third unit inverter is similarly used at the end of the temperature change determination of the third unit. The temperature AB3 is stored at address 1132 of the volatile memory.

  In step 720, the lowest temperature motor is checked among the first to third motors. If the lowest temperature motor is the first motor, the volatile memory 1100 uses the temperature of the first motor as TMC in step 721. If the motor with the lowest temperature is No. 2, the temperature of the No. 2 motor is stored as TMC at the volatile memory address 1100 in step 722, and the motor with the lowest temperature is No. 3 as well. In step 723, the temperature of the No. 3 motor is stored as TMC in the volatile memory 1100.

In step 731, a temperature change determination value is obtained. For example, when the determination value of the heater operation is obtained, the determination value DG2 is obtained from Expression (5) from TP2 at address 2102 of the nonvolatile memory shown in FIG. 20B and DGA, DGB, and TMC.

DG2 = (DGA-DGB) × (DGA-TP2) × (DGA-TMC) (5)

And it memorize | stores in DG2 of the volatile memory 1202 as a determination reference value. Similarly, when determining the determination value of the pump operation, the determination value DG3 is determined from Equation (6) using TP3 at address 2103 of the nonvolatile memory.

DG3 = (DGA-DGB) × (DGA-TP3) × (DGA-DGC) (6)

And it memorize | stores in DG3 of the volatile memory 1203 address as a judgment reference value.

  In step 732, the control device transmits a determination value to each inverter. When the determination value is sent from the control device, the inverter stores the determination value in the corresponding number (address 1202 or address 1203) in the volatile memory. deep.

  As described above, in this embodiment, in the water supply apparatus using a plurality of pumps driven by a plurality of synchronous motors controlled in speed by a plurality of inverters, each inverter is a part of a housing of each synchronous motor. Each inverter uses a temperature detector to detect the housing temperature and the housing temperature falls below a first predetermined temperature (temperature at which the motor needs to be heated: temperature 1) When an electric current is passed through the motor for heating, the heater is turned on when the temperature falls below a second predetermined temperature (temperature at which the heater must be operated to warm the pump: temperature 2). The control device outputs a signal. As a result, the water supply system can be started efficiently by warming the electric motor or operating the heater before it becomes low temperature, so that the pump can be started at all times. The pump can be started.

  Although the embodiments have been described above, the present invention is not limited to the above-described embodiments, and includes various modifications. Moreover, it is not necessarily limited to what has all the structures demonstrated. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Moreover, it is also possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

9 ... Housing,
10, 10-1, 10-2, 10-3 ... pump,
20, 20-1, 20-2, 20-3 ... electric motor,
7, 30, 30-1, 30-2, 30-3 ... inverter,
40 ... Control device,
61, 62 ... heater

Claims (12)

An inverter that controls a synchronous motor that rotationally drives the pump unit,
The inverter is attached to a part of the housing constituting the outer periphery of the armature of the synchronous motor, and is configured to detect the housing temperature of the housing by a temperature detector provided in the inverter,
A signal output unit for turning on and off the power of the heater provided at the end of the pump unit;
An arithmetic processing unit for determining the rotational speed of the synchronous motor;
A storage unit for storing control parameters necessary for the calculation performed by the calculation processing unit;
A power converter for supplying a drive current to the armature of the synchronous motor;
Have
Before kiha Ujingu temperature, if a value below the first predetermined temperature is a temperature determination value a reactive current is started to be passed to the synchronous motor, the synchronous flowing a reactive current to the synchronous motor from the power converter Warm the motor,
When the housing temperature falls below a second predetermined temperature, which is a temperature determination value at which the heater starts operating, a signal for turning on the heater is output .
When the temperature drop of the housing temperature exceeds a second predetermined temperature change amount that is a temperature change determination value for operating the heater during a second predetermined time, the heater is turned on. An inverter characterized by outputting a signal for the purpose . An inverter that controls a synchronous motor that rotationally drives the pump unit,
The inverter is attached to a part of the housing constituting the outer periphery of the armature of the synchronous motor, and is configured to detect the housing temperature of the housing by a temperature detector provided in the inverter,
A signal output unit for turning on and off the power of the heater provided at the end of the pump unit;
An arithmetic processing unit for determining the rotational speed of the synchronous motor;
A storage unit for storing control parameters necessary for the calculation performed by the calculation processing unit;
A power converter for supplying a drive current to the armature of the synchronous motor;
Have
The housing temperature, if a value below the first predetermined temperature is a temperature determination value a reactive current is started to be passed to the synchronous motor, the synchronous motor by supplying a reactive current to the synchronous motor from the power converter Warm,
When the housing temperature falls below a second predetermined temperature, which is a temperature determination value at which the heater starts operating, a signal for turning on the heater is output .
When the housing temperature falls below the first predetermined temperature, the temperature reaches a fourth predetermined temperature that is higher than the first predetermined temperature and is a temperature determination value for stopping the heating of the synchronous motor. The inverter is characterized in that the synchronous motor is not operated during the period . An inverter that controls a synchronous motor that rotationally drives the pump unit,
The inverter is attached to a part of the housing constituting the outer periphery of the armature of the synchronous motor, and is configured to detect the housing temperature of the housing by a temperature detector provided in the inverter,
A signal output unit for turning on and off the power of the heater provided at the end of the pump unit;
An arithmetic processing unit for determining the rotational speed of the synchronous motor;
A storage unit for storing control parameters necessary for the calculation performed by the calculation processing unit;
A power converter for supplying a drive current to the armature of the synchronous motor;
Have
When the housing temperature falls below a first predetermined temperature, which is a temperature determination value at which reactive current starts to flow to the synchronous motor, the reactive current is passed from the power converter to the synchronous motor to cause the synchronous motor to Warm,
When the housing temperature falls below a second predetermined temperature, which is a temperature determination value at which the heater starts operating, a signal for turning on the heater is output.
When the housing temperature is lower than the second predetermined temperature, the temperature is higher than the second predetermined temperature until reaching a fifth predetermined temperature that is a temperature determination value for stopping the pump operation. An inverter characterized by not operating a synchronous motor .
An inverter characterized by that. A plurality of pump parts provided in the pump casing and having an impeller;
A plurality of synchronous motors that respectively rotate and drive the plurality of pump units;
A plurality of inverters respectively controlling the plurality of synchronous motors;
Pressure detection means provided in common on the discharge side of the plurality of pumps;
A water supply pipe provided on the discharge side of the plurality of pumps;
A suction pipe provided on the suction side of the plurality of pumps;
A control device for controlling operation / stop of the plurality of inverters;
In a water supply apparatus having
The plurality of inverters are:
It is attached to a part of the housing constituting the outer periphery of each armature of the plurality of synchronous motors, and is configured to detect the temperature of the housing by a temperature detector provided in the inverter,
An arithmetic processing unit for determining the rotational speed of the synchronous motor;
A storage unit for storing control parameters necessary for the calculation performed by the calculation processing unit;
A power converter for supplying a drive current to the armature of the synchronous motor;
A communication means for communicating with the control device;
Have
The controller is
A signal output unit for turning on and off the heater provided in the water supply pipe or the suction pipe, or both;
A communication means for communicating with the inverter;
Have
The inverter is
When the housing temperature is detected using the temperature detector and the housing temperature falls below a first predetermined temperature that is a temperature determination value at which a reactive current starts to flow through the synchronous motor, the power conversion device Pass a reactive current through the synchronous motor to warm the synchronous motor,
The controller is
When the housing temperature of any one of the synchronous motors falls below a second predetermined temperature that is a temperature determination value at which the heater starts operating, a signal for turning on the heater is output.
When the temperature drop of the housing temperature exceeds a second predetermined temperature change amount that is a temperature change determination value for operating the heater during a second predetermined time, the heater is turned on. The water supply apparatus characterized by outputting the signal for A plurality of pump parts provided in the pump casing and having an impeller;
A plurality of synchronous motors that respectively rotate and drive the plurality of pump units;
A plurality of inverters respectively controlling the plurality of synchronous motors;
Pressure detection means provided in common on the discharge side of the plurality of pumps;
A water supply pipe provided on the discharge side of the plurality of pumps;
A suction pipe provided on the suction side of the plurality of pumps;
A control device for controlling operation / stop of the plurality of inverters;
In a water supply apparatus having
The plurality of inverters are:
It is attached to a part of the housing constituting the outer periphery of each armature of the plurality of synchronous motors, and is configured to detect the temperature of the housing by a temperature detector provided in the inverter,
An arithmetic processing unit for determining the rotational speed of the synchronous motor;
A storage unit for storing control parameters necessary for the calculation performed by the calculation processing unit;
A power converter for supplying a drive current to the armature of the synchronous motor;
A communication means for communicating with the control device;
Have
The controller is
A signal output unit for turning on and off the heater provided in the water supply pipe or the suction pipe, or both;
A communication means for communicating with the inverter;
Have
The inverter is
When the housing temperature is detected using the temperature detector and the housing temperature falls below a first predetermined temperature that is a temperature determination value at which a reactive current starts to flow through the synchronous motor, the power conversion device Pass a reactive current through the synchronous motor to warm the synchronous motor,
The controller is
When the housing temperature of any one of the synchronous motors falls below a second predetermined temperature that is a temperature determination value at which the heater starts operating, a signal for turning on the heater is output.
When the housing temperature falls below the first predetermined temperature, the temperature reaches a fourth predetermined temperature that is higher than the first predetermined temperature and is a temperature determination value for stopping the heating of the synchronous motor. The water supply device is characterized in that the synchronous motor is not operated during the period . A plurality of pump parts provided in the pump casing and having an impeller;
A plurality of synchronous motors that respectively rotate and drive the plurality of pump units;
A plurality of inverters respectively controlling the plurality of synchronous motors;
Pressure detection means provided in common on the discharge side of the plurality of pumps;
A water supply pipe provided on the discharge side of the plurality of pumps;
A suction pipe provided on the suction side of the plurality of pumps;
A control device for controlling operation / stop of the plurality of inverters;
In a water supply apparatus having
The plurality of inverters are:
It is attached to a part of the housing constituting the outer periphery of each armature of the plurality of synchronous motors, and is configured to detect the temperature of the housing by a temperature detector provided in the inverter,
An arithmetic processing unit for determining the rotational speed of the synchronous motor;
A storage unit for storing control parameters necessary for the calculation performed by the calculation processing unit;
A power converter for supplying a drive current to the armature of the synchronous motor;
A communication means for communicating with the control device;
Have
The controller is
A signal output unit for turning on and off the heater provided in the water supply pipe or the suction pipe, or both;
A communication means for communicating with the inverter;
Have
The inverter is
When the housing temperature is detected using the temperature detector and the housing temperature falls below a first predetermined temperature that is a temperature determination value at which a reactive current starts to flow through the synchronous motor, the power conversion device Pass a reactive current through the synchronous motor to warm the synchronous motor,
The controller is
When the housing temperature of any one of the synchronous motors falls below a second predetermined temperature that is a temperature determination value at which the heater starts operating, a signal for turning on the heater is output.
When the housing temperature is lower than the second predetermined temperature, the temperature is higher than the second predetermined temperature until reaching a fifth predetermined temperature that is a temperature determination value for stopping the pump operation. A water supply apparatus characterized by not operating a synchronous motor. An inverter that controls a synchronous motor that rotationally drives the pump unit,
The inverter is attached to a part of the housing constituting the outer periphery of the armature of the synchronous motor, and is configured to detect the housing temperature of the housing by a temperature detector provided in the inverter,
An arithmetic processing unit for determining the rotational speed of the synchronous motor;
A storage unit for storing control parameters necessary for the calculation performed by the calculation processing unit;
A power converter for supplying a drive current to the armature of the synchronous motor;
Have
When the housing temperature falls below a third predetermined temperature, which is a temperature determination value at which the pump unit starts operating, the synchronous motor is operated,
The synchronous motor is operated when the temperature drop of the housing temperature exceeds a third predetermined temperature change amount that is a temperature change determination value for operating the pump during a third predetermined time. And inverter. An inverter that controls a synchronous motor that rotationally drives the pump unit,
The inverter is attached to a part of the housing constituting the outer periphery of the armature of the synchronous motor, and is configured to detect the housing temperature of the housing by a temperature detector provided in the inverter,
An arithmetic processing unit for determining the rotational speed of the synchronous motor;
A storage unit for storing control parameters necessary for the calculation performed by the calculation processing unit;
A power converter for supplying a drive current to the armature of the synchronous motor;
Have
When the housing temperature falls below a third predetermined temperature, which is a temperature determination value at which the pump unit starts operating, the synchronous motor is operated,
Even when the housing temperature is lower than the third predetermined temperature, the synchronous motor is operated when the housing temperature is lower than a first predetermined temperature which is a temperature determination value at which a reactive current starts to flow through the synchronous motor. An inverter characterized by not operating . An inverter that controls a synchronous motor that rotationally drives the pump unit,
The inverter is attached to a part of the housing constituting the outer periphery of the armature of the synchronous motor, and is configured to detect the housing temperature of the housing by a temperature detector provided in the inverter,
A signal output unit for turning on and off the power of the heater provided at the end of the pump unit;
An arithmetic processing unit for determining the rotational speed of the synchronous motor;
A storage unit for storing control parameters necessary for the calculation performed by the calculation processing unit;
A power converter for supplying a drive current to the armature of the synchronous motor;
Have
When the housing temperature falls below a third predetermined temperature, which is a temperature determination value at which the pump unit starts operating, the synchronous motor is operated,
Even when the housing temperature falls below the third predetermined temperature, the synchronous motor is not operated when the housing temperature falls below a second predetermined temperature, which is a temperature determination value at which the heater starts operating. An inverter characterized by that. The inverter according to claim 1 or 7 ,
An inverter characterized in that a data table of a temperature change determination value which is the second or third predetermined temperature change amount is stored in the storage unit . The inverter according to claim 1 or 7 ,
An inverter that automatically calculates a temperature change determination value that is the second or third predetermined temperature change amount . A plurality of pump parts provided in the pump casing and having an impeller;
A plurality of synchronous motors that respectively rotate and drive the plurality of pump units;
A plurality of inverters respectively controlling the plurality of synchronous motors;
Pressure detection means provided in common on the discharge side of the plurality of pumps;
A water supply pipe provided on the discharge side of the plurality of pumps;
A suction pipe provided on the suction side of the plurality of pumps;
A control device for controlling operation / stop of the plurality of inverters;
In a water supply apparatus having
The plurality of inverters are:
It is attached to a part of the housing constituting the outer periphery of each armature of the plurality of synchronous motors, and is configured to detect the temperature of the housing by a temperature detector provided in the inverter,
An arithmetic processing unit for determining the rotational speed of the synchronous motor;
A storage unit for storing control parameters necessary for the calculation performed by the calculation processing unit;
A power converter for supplying a drive current to the armature of the synchronous motor;
A communication means for communicating with the control device;
Have
The controller is
A signal output unit for turning on and off the heater provided in the water supply pipe or the suction pipe, or both;
A communication means for communicating with the inverter;
Have
The inverter is
When the housing temperature is detected using the temperature detector and the housing temperature falls below a first predetermined temperature that is a temperature determination value at which a reactive current starts to flow through the synchronous motor, the power conversion device Pass a reactive current through the synchronous motor to warm the synchronous motor,
The controller is
When the housing temperature of any one of the synchronous motors falls below a second predetermined temperature that is a temperature determination value at which the heater starts operating, a signal for turning on the heater is output.
When the temperature drop of the housing temperature exceeds a second predetermined temperature change amount that is a temperature change determination value for operating the heater during a second predetermined time, the inverter supplies power to the heater. Outputs a signal to enter,
The control device automatically calculates a temperature change determination value for operating the heater.

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