JP2012241947A - Pump motor control device - Google Patents

Pump motor control device Download PDF

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Publication number
JP2012241947A
JP2012241947A JP2011110756A JP2011110756A JP2012241947A JP 2012241947 A JP2012241947 A JP 2012241947A JP 2011110756 A JP2011110756 A JP 2011110756A JP 2011110756 A JP2011110756 A JP 2011110756A JP 2012241947 A JP2012241947 A JP 2012241947A
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pump motor
pump
motor
control device
motor control
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JP2011110756A
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Japanese (ja)
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Shuichi Iwata
秀一 岩田
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Hitachi Appliances Inc
日立アプライアンス株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a pump motor control device that can operate a pump as normal as possible irrespective of a use environment of the pump.SOLUTION: A heat pump water heater 11 includes a hot water storage cycle 16 communicating and connecting, via pieces of water piping 17a, 17b, a hot water storage tank 31 storing water supplied from a water supply and hot water to be supplied to a hot water supply destination, and a circulation pump 33 sucking in low temperature water from the hot water storage tank 31, delivering the sucked in low temperature water to a heating part 21, and returning heated hot water to the hot water storage tank 31. A pump motor control part 65 operates in a high load mode of passing a motor current exceeding a rated current to a pump motor 34 such that a suction side water temperature Tp reaches a target boiling temperature Ttg within a boiling time when it is required to pass the motor current exceeding the rated current in which a size of an operation load of the pump motor 34 is a characteristic value guaranteeing stable operation of the pump motor 34.

Description

  The present invention relates to a heat pump water heater including a pump driven by a pump motor, and more particularly to a pump motor control device that controls the pump motor.

  As part of energy saving measures, for example, heat pump water heaters that drive a heat pump cycle and a hot water storage cycle using midnight power, heat low temperature water, and store hot water at a set temperature in a hot water storage tank have become widespread. In such a heat pump water heater, heat exchange is performed between the high-temperature and high-pressure gas refrigerant compressed by the compressor of the heat pump cycle and the low-temperature water sucked from the bottom of the hot water storage tank of the hot water storage cycle. The high-temperature water boiled by this heat exchange is circulated so as to return to the top of the hot water storage tank through the water pipe. For example, by causing the pump described in Patent Document 1 to perform such water circulation operation, hot water having a set temperature is stored in a hot water storage tank.

JP 2010-119164 A

  In such a heat pump water heater, the usage environment of the pump varies depending on the customer. For example, a situation where the pump and the hot water storage tank are installed 15 m apart from each other, and a situation where the hot water storage tank is installed 3 m higher than the pump are assumed. Moreover, the scene where the environmental temperature around a pump will be -20 degrees C or less, for example is also assumed. In these various situations, the pump and hot water storage tank are located close to each other, there is almost no difference in height between the pump and the hot water storage tank, or the ambient temperature around the pump never falls below -20 ° C. Compared with the case, a large load is imposed on the pump motor that drives the pump. As a result, the pump may not be able to operate normally.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to enable normal operation of the pump as much as possible regardless of the use environment of the pump.

  The present invention relates to a tank for storing a liquid supplied from a liquid supply source and a liquid supplied to a liquid supply destination, and a liquid obtained by sucking a low-temperature liquid from the tank and discharging the sucked low-temperature liquid to a heating unit. It is premised on a liquid storage type liquid heating and supply device (in the embodiment described later, “heat pump water heater”) having a liquid storage cycle in which a pump for returning the fuel to the tank is connected in communication via a liquid pipe. .

  The present invention includes a pump motor that drives the pump, a suction side liquid temperature detection unit that detects a suction side liquid temperature of the heating unit, a motor current detection unit that detects a motor current flowing in the pump motor, and the pump A motor voltage detection unit for detecting a motor voltage applied to the motor; a target boiling condition setting unit for setting a target boiling temperature and boiling time; and the heating detected by the suction side liquid temperature detection unit Suction side liquid temperature, motor current detected by the motor current detection unit, motor voltage detected by the motor voltage detection unit, and target boiling condition set by the target boiling condition setting unit And a pump motor control unit for controlling the rotational speed of the pump motor based on the calculated operating load.

  The pump motor control unit, when the calculated operating load is required to flow a motor current exceeding a rated current value, which is a characteristic value that guarantees stable operation of the pump motor, The operation is performed in a high load mode in which a motor current exceeding the rated current value is supplied to the pump motor so that the liquid temperature reaches the target boiling temperature within the boiling time.

  ADVANTAGE OF THE INVENTION According to this invention, a pump can be normally operated as much as possible irrespective of the operating environment of a pump.

1 is a system configuration diagram of a heat pump water heater to which a pump motor control device according to an embodiment of the present invention is applied. It is a block block diagram of the pump motor control apparatus which concerns on embodiment of this invention. It is a block block diagram of a vector control part among the pump motor control parts of FIG. It is a flowchart figure with which it uses for operation | movement description of the pump motor control apparatus at the time of making the heat pump water heater perform boiling operation for predetermined time. It is a flowchart figure with which it uses for operation | movement description of the pump motor control apparatus at the time of making a heat pump water heater perform boiling operation. It is a flowchart figure with which it uses for operation | movement description of the pump motor control apparatus at the time of making a heat pump water heater perform boiling operation. It is a characteristic view showing the relationship between the rotational speed of a pump motor and motor current. It is a figure showing the installation environment (large pressure loss) of a heat pump water heater. It is a figure showing the installation environment (large pressure loss) of a heat pump water heater. It is a characteristic view showing the relation between the boiling time and the boiling temperature of the pump motor control device in comparison with the comparative example.

Hereinafter, a pump motor control device according to an embodiment of the present invention will be described in detail with reference to the drawings.
(System configuration of the heat pump water heater 11)
FIG. 1 is a system configuration diagram of a heat pump water heater 11 to which a pump motor control device 49 according to an embodiment of the present invention is applied. As shown in FIG. 1, a heat pump water heater 11 to which a pump motor control device 49 according to an embodiment of the present invention is applied includes a heat pump unit 13 and a hot water storage unit 15 that are connected to an outward piping 17a and a return piping 17b (of the present invention). (Equivalent to “Liquid Piping”).

  As shown in FIG. 1, the heat pump unit 13 includes a compressor 19, a heat exchanger (corresponding to a “heating unit” of the present invention) 21, an electric expansion valve 23, and an evaporator 25. A heat pump cycle 14, a circulation pump 33, and a heat pump unit control device 47, which are connected in a ring shape through a refrigerant pipe 22 serving as a passage, are provided. The compressor 19 has a function of compressing the refrigerant. The heat exchanger 21 includes a refrigerant-side heat transfer tube 21 a through which high-temperature and high-pressure compressed refrigerant discharged from the compressor 19 circulates, and a water-side heat transfer tube 21 b through which water sent from the hot water storage tank 31 circulates. The heat exchanger 21 heats water by heat exchange with a high-temperature and high-pressure compressed refrigerant.

  As shown in FIG. 1, the electric expansion valve 23 through which the refrigerant condensed in the heat exchanger 21 depressurizes the medium temperature / high pressure refrigerant and sends it to the evaporator 25 as a low temperature / low pressure refrigerant that easily evaporates. The evaporator 25 evaporates the low-temperature and low-pressure refrigerant expanded by the electric expansion valve 23 and returns it to the compressor 19. Specifically, as shown in FIG. 1, the evaporator 25 takes in the outside air by the blower fan 27 that is rotated by the operation of the fan motor 27 a, exchanges heat between the air and the refrigerant, and absorbs heat from the outside air. Take a role.

  The circulation pump 33 has a function of pumping out water circulating in the hot water storage cycle 16 to be described later by rotationally driving an impeller (not shown) in the pump chamber by a pump motor 34 (see FIG. 2). The circulation pump 33 sucks low temperature water from the bottom of the hot water storage tank 31 and discharges the sucked low temperature water to the heat exchanger 21 on the heat pump cycle 14 side so as to return the heated hot water to the top of the hot water storage tank 31. The pump motor 34 includes, for example, a rotor in which a stator made of a permanent magnet is arranged on the outer periphery, and a brushless motor having 4 or 8 magnetic poles can be suitably used.

  On the other hand, the hot water storage unit 15 includes a hot water storage tank 31 and a hot water storage unit controller 39 as shown in FIG. The hot water storage tank 31 plays a role of storing water supplied from a water supply source via the water supply pipe 35 and hot water supplied to the hot water supply system via the hot water supply pipe 37. The hot water storage tank 31 and the circulation pump 33 on the side of the heat pump cycle 14 and the heat exchanger 21 are connected in a circular manner through the forward piping 17a and the backward piping 17b, respectively, which serve as hot water flow passages, so that the hot water storage cycle. (Corresponding to the “liquid storage cycle” of the present invention) 16 is formed.

  A casing (not shown) of the compressor 19 is provided with a compressed refrigerant temperature sensor 20 for detecting the temperature of the high-temperature and high-pressure compressed refrigerant, as shown in FIG. Further, on the downstream side of the compressor 19, a compressed refrigerant pressure sensor (not shown) that detects the pressure of the refrigerant discharged from the compressor 19 is provided. As shown in FIG. 1, a heat exchanger outlet refrigerant temperature sensor 40 and a heat exchanger outlet refrigerant pressure sensor 41 are provided in the refrigerant pipe 22 positioned on the downstream side of the heat exchanger 21. As shown in FIG. 1, an outside air temperature sensor 42 that measures the ambient temperature of the outside air is provided in the vicinity of the evaporator 25.

  As shown in FIG. 1, a pump water temperature sensor for measuring the temperature of water flowing into the circulation pump 33 (the “suction side liquid temperature detection unit” of the present invention) is provided in the forward piping 17a located upstream of the circulation pump 33. 43) is provided. In addition, a heat exchanger outlet water temperature sensor 45 that measures the temperature of the water flowing out from the heat exchanger 21 is provided on the return pipe 17 b located on the downstream side of the heat exchanger 21. The detected values of these temperature sensors 20, 40, 42, 43, 45 and the detected values of the compressed refrigerant pressure sensor and the heat exchanger outlet refrigerant pressure sensor 41 are given to the heat pump unit controller 47.

  In addition, as shown in FIG. 1, hot water storage sensors 31 a to 31 e for detecting the hot water storage temperature and the amount of hot water stored in the hot water storage tank 31 are provided inside the hot water storage tank 31. The detection values of the hot water storage sensors 31 a to 31 e are given to the hot water storage unit control device 39.

  The hot water storage unit control device 39 and the heat pump unit control device 47 are, for example, a microcomputer (not shown) (hereinafter referred to as “microcomputer”) including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. Is omitted). The microcomputer reads and executes a program stored in the ROM, and operates to perform various controls such as hot water storage operation / stop control described below.

  The hot water storage unit control device 39 and the heat pump unit control device 47 operate in cooperation with each other, thereby controlling the operation / stop of the heat pump cycle 14, the capacity / rotational speed control of the compressor 19, and adjusting the opening of the electric expansion valve 23. It controls the rotational speed control of the fan motor 27a, the operation / stop control of the hot water storage cycle 16, the operation / stop control of the circulation pump 33, and the like. Thereby, the hot water storage unit control device 39 and the heat pump unit control device 47 can appropriately perform the hot water storage operation, the defrosting operation, the hot water supply operation, and the like. The heat pump unit controller 47 includes a pump motor controller 49 that plays an important role in this embodiment. The pump motor control device 49 is provided separately from the circulation pump 33.

Next, the configuration of the pump motor control device 49 according to the embodiment of the present invention will be described in detail with reference to the drawings.
(Configuration of pump motor control device 49)
FIG. 2 is a block diagram of the pump motor control device 49 according to the embodiment of the present invention. FIG. 3 is a block diagram of the vector control unit 75 in the pump motor control device 49 shown in FIG.

As shown in FIG. 2, the pump motor control device 49 according to the embodiment of the present invention includes a PAM circuit 53 connected to an AC power supply 51, a motor drive circuit 55, a driver 57 connected to the PAM circuit 53, and an AD conversion unit. 59, a driver 61 connected to the motor drive circuit 55, an AD conversion unit 63, and a pump motor control unit 65.

  The PAM circuit 53 converts the AC power of the AC power supply 51 into DC power and adjusts the level of the DC voltage. The driver 57 performs drive control of the PAM circuit in accordance with a command from the PAM control unit 83 of the pump motor control unit 65. The AD conversion unit 59 includes, for example, a resistor and a sensor, converts the DC voltage signal whose level has been adjusted by the PAM circuit 53 into a digital value, and provides the digital value to the PAM control unit 83 of the pump motor control unit 65.

  The driver 61 passes a rotation speed control signal of the pump motor 34 in accordance with a command from the pump motor control unit 65 to the motor drive circuit 55. In response to this, the motor drive circuit 55 rotationally drives the pump motor 34 in accordance with the rotational speed control signal. The AD conversion unit 63 converts the rotation speed signal of the pump motor 34 into a digital value and supplies the digital value to the pump motor control unit 65.

  As shown in FIG. 2, the pump motor control unit 65 includes a target heating capacity processing unit 71, a target boiling condition processing unit 73, a vector control unit 75, an abnormality detection processing unit 77, and a motor information storage unit 79. The motor current limit processing unit 81, the PAM control unit 83, and the field weakening control unit 85 are provided. The pump motor controller 65 is provided with information on the outside air temperature detected by the outside air temperature sensor 42 and information on the pump inlet water temperature Tp detected by the pump inlet water temperature sensor 43.

  The target heating capacity processing unit 71 performs processing related to the target heating capacity. Specifically, the target heating capacity processing unit 71 sets the target boiling temperature Ttg based on the outside air temperature Tot detected by the outside air temperature sensor 42 (for example, any one of 65, 85, and 90 ° C.). Based on the deviation ΔT between the outside air temperature Tot and the pump water temperature Tp detected by the pump water temperature sensor 43, the target rotational speed Ntg of the pump motor 34 for satisfying the required flow rate is set. The setting of the target boiling temperature Ttg based on the outside air temperature Tot is, for example, 65 ° C. when the outside air temperature Tot is low (less than 15 ° C.), and 85 ° when medium (15-25 ° C.). When C is high (over 25 ° C), it is set at 90 ° C. When the target boiling temperature Ttg is set to a high temperature when the outside air temperature Tot is low, it is difficult to reach the target temperature.

  A target boiling condition processing unit (corresponding to the “target boiling condition setting unit” of the present invention) 73 performs a target boiling condition process for realizing the target boiling temperature Ttg. At the initial setting of the target boiling temperature Ttg, the temperature of the water in the hot water storage tank 31 is normally low. In this state, the high-temperature and high-pressure gas refrigerant compressed by the compressor 19 and the low-temperature water sucked from the bottom of the hot water storage tank 31 are heat-exchanged in the heat exchanger 21, and the high-temperature water boiled by this heat exchange is Then, a boiling operation for returning to the top of the hot water storage tank 31 is performed. Then, the water in the hot water storage tank 31 has a high temperature in the upper part where the high-temperature water is returned, but has a temperature distribution such that the intermediate part has a medium temperature and the lower part has a low temperature.

  In order to bring the entire water in the hot water storage tank 31 having such temperature distribution to 90 ° C. set as the target boiling temperature Ttg, for example, boiling operation for a long time is required. In this case, it is also assumed that it is necessary to perform the boiling operation even in a time zone outside the nighttime power time zone. Therefore, for example, even when 90 ° C. is set as the target boiling temperature Ttg, a predetermined ratio (for example, a ratio that can be changed as appropriate, such as 55% to 75%) of the entire capacity of the hot water storage tank 31. Water is approximately 90 ° C., and the pump water temperature Tp converges within a predetermined temperature range (for example, a temperature range that can be changed as appropriate, such as 55 ° C. to 65 ° C.). The boiling condition processing unit 73 considers that the boiling has been completed.

  The vector control unit 75 has a function of inputting a digital conversion value of the motor current Iu flowing through the pump motor 34 via the AD conversion unit 63 and outputting a drive control signal of the pump motor 34 via the driver 61.

  The abnormality detection processing unit 77 detects an abnormal state of the circulation pump 33 based on digital data relating to the motor current and performs appropriate abnormality processing such as stopping the pump motor 34 when the abnormal state is detected. It has a function.

  The motor information storage unit 79 has a function of storing characteristic data unique to the pump motor 34 (rated current value, upper limit current value, lower limit current value, excessive current value, rated torque, resistance, induced voltage, inductance, etc.). The characteristic data unique to the pump motor 34 stored in the motor information storage unit 79 is, for example, the magnitude of the motor current Iu and any of a rated current value, an upper limit current value, a lower limit current value, and an excessive current value. Is referred to as appropriate when comparing the two.

  The motor current limit processing unit 81 performs a process related to motor current limit for protecting a motor driving IC (not shown) included in the driver 61 from an excessive current.

  The PAM control unit 83 performs processing related to generation of a DC voltage signal to be given to the PAM circuit 53. The field weakening control unit 85 works to reduce the field magnetic flux (excitation current) of the pump motor 34 when a request to increase the rotational speed of the pump motor 34 occurs.

  Here, the operation of the PAM circuit 53 will be described. The PAM circuit 53 seamlessly boosts the current DC voltage with the aim of causing the current DC voltage applied to the pump motor 34 to follow the target DC voltage value. As a result, the motor current flowing through the pump motor 34 becomes a motor current at a high load that is larger than the motor current at the pump rated load. Then, the PAM circuit 53 further boosts the current DC voltage. As a result, the PAM circuit 53 functions to increase the output torque of the pump motor 34 more than the rated torque.

  In order to boost the current DC voltage seamlessly, for example, active converter (whole area high frequency switching) control using a power factor correction drive IC may be employed. Further, in order to suppress high-frequency switching loss, one-pulse shot control for detecting the power supply voltage, multi-pulse shot control in which harmonic components are suppressed, or the like may be employed. Note that the PAM circuit 53 including an active filter, which is a component of the pump motor control device 49 according to the present embodiment, has a power factor improvement function. This is because the current waveform of the AC power supply 51 can be shaped into a sine wave by the waveform shaping action of the active filter.

  Here, in the high load operation control in which the circulation pump 33 is operated in the high load mode (meaning that the pump motor 34 is driven in a range exceeding the rated current value Iu_R), an approach in which the DC voltage is increased by the PAM circuit 53 is employed. If the torque is insufficient, the approach for field weakening control is used. That is, it is known that the load torque of the pump motor 34 generally increases in direct proportion to the magnitude of the motor current. Therefore, the field weakening control unit 85 reduces the magnetic field that acts to prevent high-speed rotation. This facilitates the flow of the motor current while suppressing an increase in the voltage applied to the pump motor 34. As a result, the motor drive circuit 55 can operate the pump motor 34 at high speed (high load mode).

  For example, when attempting to operate the circulation pump 33 in the high load mode with a large pressure loss, the following processing is sequentially performed. First, the target boiling condition processing unit 73 obtains a target boiling temperature Ttg based on the outside air temperature Tot. The target heating capacity processing unit 71 calculates the target heating capacity by calculation based on the actual rotational speed Nre of the pump motor 34 based on the motor current and the detected value of the pump water temperature sensor 43. The motor drive circuit 55 can perform high-load operation control while continuously changing the necessary rotation speed of the pump motor 34 from a low speed to a high speed (flowing a motor current proportional to the torque).

  In addition, each function part 53, 55, 57, 59, 61, 63, 65 which comprises the pump motor control apparatus 49 is collectively provided on one control board (not shown). This control board is provided on the heat pump water heater 11 on either the heat pump unit 13 side or the hot water storage unit 15 side and at a site away from the circulation pump 33.

Next, the configuration of the vector control unit 75 in the pump motor control device 49 according to the embodiment of the present invention will be described in detail with reference to the drawings.
(Configuration of vector control unit 75)
FIG. 3 is a block diagram of the vector control unit 75 in the pump motor control device 49 shown in FIG. As shown in FIG. 3, the vector control unit 75 includes a motor voltage equation calculation unit 87, a two-phase → three-phase conversion unit 89, a phase calculation unit 91, a phase current reproduction unit 93, and a three-phase → two-phase conversion. And a two-phase to three-phase conversion unit 97.

In FIG. 3, Id * is a d-axis current command, f * is a frequency (pump rotation speed calculated from magnetic pole estimation) command, Vd * is a d-axis voltage command, Vq * is a q-axis voltage command, θ is a voltage phase, Iu Is the U-phase motor current (the motor current estimated from the digital conversion value of the AD converter 63), Iw is the W-phase motor current, Iq is the q-axis motor current proportional to the torque, and Id is the d-axis motor current (weakens the field) Iu 'is the previous value of Iu, Iw' is the previous value of Iw, Idc is the direct current value flowing through the pump motor 34, Vu is the U-phase motor voltage, Vv is the V-phase motor voltage, and Vw is the W-phase. Motor voltage.

Based on the d-axis current command, the frequency command, and the actual q-axis current that is the current feedback value, the vector control unit 75 calculates a pulse train to be applied to a switching element (not shown) that is a component of the motor drive circuit 55, and the pump motor 34 is a general one that performs rotation speed control. Since the calculation formula of each calculation block is a well-known formula shown in an electrical engineering handbook or the like, detailed description thereof is omitted. Equation (1) shows a motor voltage equation of the vector control unit 75. This equation (1) determines the motor applied voltages (d-axis voltage command Vd * and q-axis voltage command Vq * ) to become the d-axis current command Id * and the q-axis current command Iq * .

An example of motor constants used in the motor voltage equation of equation (1) will be described. r is the phase resistance of the motor coil, Lq is an inductance of the q-axis component, Ld is d-axis component of the inductance (easy street field flux direction), K E is a constant phase induced voltage, 2πf * (= ω *) is Electrical angular frequency.

The motor voltage equation calculation unit 87 calculates the d-axis voltage command for Vd * and the q-axis voltage command for Vq * based on the d-axis current command for Id * , the frequency command for f * , and the q-axis motor current for Iq. .

The two-phase to three-phase conversion unit 89 refers to the voltage phase θ and determines the Vu U-phase motor voltage, Vv V-phase motor voltage, Vw from the Vd * d-axis voltage command and Vq * q-axis voltage command. The W-phase motor voltage is calculated.

The phase calculator 91 advances the motor voltage phase in proportion to the frequency command of f * , calculates an instantaneous value of the motor voltage phase, and stores it in the voltage phase θ.

  The phase current reproduction unit 93 reads the motor current Idc converted into a digital value by the AD conversion unit 63, and calculates the U-phase motor current of Iu, the V-phase motor current of Iv, and the W-phase motor current of Iw.

  The three-phase to two-phase converter 95 calculates the Iq q-axis motor current and the Id d-axis motor current based on the Iu U-phase motor current, the Iv V-phase motor current, and the Iw W-phase motor current. .

  The two-phase to three-phase conversion unit 97 refers to the voltage phase θ and calculates the Iu previous value of Iu ′ and the Iw previous value of Iw ′ from the q-axis motor current of Iq and the d-axis motor current of Id. The Iu previous value of Iu ′ and the Iw previous value of Iw ′ are used to substitute the previously calculated value of the phase current as the current value when the phase current reproduction unit 93 cannot reproduce the phase current. The d-axis and q-axis currents are respectively adjusted according to the purpose of high efficiency or the purpose of high-speed operation.

  For example, when the pump 33 is operated at a high speed (high load mode), the field weakening control unit 85 causes a negative d-axis current to flow by field weakening control. That is, the magnetic field that acts to prevent high-speed rotation is reduced. Thereby, the rise of the voltage applied to the pump motor 34 can be suppressed. By using the field weakening control, the motor voltage applied to the pump motor 34 can be kept within a predetermined range, and the motor voltage can be rotated at high speed by flowing a motor current proportional to the torque without increasing the DC voltage.

(Operation of the pump motor control device 49 of the heat pump water heater 11)
Next, the flow of processing performed by the pump motor control device 49 according to the embodiment of the present invention will be described with reference to FIGS. 4A, 4B, and 4C. 4A to 4C are flowcharts for explaining the operation of the pump motor control device 49 when the heat pump water heater 11 performs a boiling operation for a predetermined time.

  In step S11, as shown in FIG. 4A, the boiling is performed within a predetermined boiling time (for example, 8 hours or the like, which can be appropriately changed in advance. The same applies hereinafter). The heat pump unit control device 47 that has received the operation execution command starts the boiling operation and sends to the pump motor control unit 65 that the boiling operation is started.

  In step S13, as shown in FIG. 2 and FIG. 4A, the pump motor control unit 65 acquires the outside air temperature data detected by the outside air temperature sensor 42 and the pump incoming water temperature data detected by the pump incoming water temperature sensor 43.

  In step S15, as shown in FIGS. 2 and 4A, the target heating capacity processing unit 71 of the pump motor control unit 65 sets the target boiling temperature Ttg based on the outside air temperature data (for example, 65, 85, 90 °). C). The target boiling temperature Ttg set here is referred to, for example, in the target heating capacity process according to step S67 described later.

  In step S17, as shown in FIG. 2 and FIG. 4A, the pump motor control unit 65 determines whether or not the pump incoming water temperature Tp exceeds 0 ° C. The purpose of this determination is based on the fact that when the pump incoming water temperature Tp is 0 ° C. or less, the water in the pump chamber may freeze, and countermeasures are required. As a result of the determination in step S17, when the pump incoming water temperature Tp exceeds 0 ° C, the pump motor control unit 65 advances the process flow to step S19, while the pump incoming water temperature Tp decreases to 0 ° C. If not, the process flow proceeds to step S33.

  In step S19, as shown in FIGS. 2 and 4A, the pump motor control unit 65 executes a subroutine program of steps S21 to S27 related to the pump motor start control 1 under normal temperature conditions.

In step S21, as shown in FIG. 2 and FIG. 4A, the pump motor control unit 65 executes a process of positioning the rotor of the pump motor 34 at a predetermined position. This positioning process is a process required when a brushless motor is employed as the pump motor 34. Therefore, depending on the type of the pump motor 34, this positioning process can be omitted. In the block diagram of the vector control unit 75 shown in FIG. 3, the q-axis current command Iq * = 0 and the frequency command f * = 0 during the positioning operation of the pump motor 34. For this reason, by giving these values to the equation (1), the d-axis voltage command Vd * = r · Id * and the q-axis voltage command Vq * = 0 are derived, respectively.

In step S23, as shown in FIGS. 2 and 4A, the pump motor control unit 65 executes a synchronous operation process. In this synchronous operation process, for example, the value of the q-axis current command Iq * = 0 is given to the equation (1), so that the d-axis voltage command Vd * = r · Id * and the q-axis voltage command Vq * = 2πf * ·. Ld · Id * + 2πf * · K E is derived, respectively. Therefore, the pump motor control unit 65 repeatedly executes the frequency command f * until the actual rotational speed Nre reaches the target synchronous rotational speed (N = 60 · f * / number of magnetic pole pairs p).

  In step S25, as shown in FIGS. 2 and 4A, the abnormality detection processing unit 77 of the pump motor control unit 65 performs an excessive current determination during the synchronous operation processing according to step S23. For the determination of the excessive current, for example, a table storing demagnetization start currents corresponding to the assumed temperature range of the pump inlet water temperature Tp is prepared in advance, and at the time of the excessive current determination, the motor current Iu is converted into the pump inlet water temperature Tp. When the demagnetization start current corresponding to is exceeded, an overcurrent is judged. As a result of the determination of the excessive current in step S25, the pump motor control unit 65 advances the process flow to step S27 when it is determined that the excessive current has flowed, while the excessive current does not flow. When the determination is made, the process flow proceeds to step S47.

  In step S27, as shown in FIGS. 2 and 4A, the pump motor control unit 65 determines whether or not the preset number of retries (at least n = 2) has been reached continuously. As a result of this determination, if it is determined that the preset number of retries has not been reached continuously, the pump motor control unit 65 returns the process flow to step S17 and repeats the loop process of steps S17 to S25. . However, before satisfying the condition of step S27, it is determined in step S17 that the pump water temperature Tp is 0 ° C. or lower (No), or in step S25, it is determined that no excessive current flows (No). In this case, the pump motor control unit 65 goes out of the loop process of steps S17 to S25 and advances the process to each flow.

  In step S29, as shown in FIGS. 2 and 4A, if the result of determination in step S27 is that the preset number of retries has been reached continuously, the pump motor control unit 65 stores “pump lock” in the storage area of the microcomputer. An abnormality detection process 1 for storing and notifying an abnormal state related to “abnormal” and stopping the operation of the pump motor 34 is executed.

  In step S31, the pump motor 34 whose motor current Iu has been cut off by stopping its operation stops its operation. Thereby, the boiling operation is stopped.

  On the other hand, as a result of the determination in step S17, if it is determined that the pump incoming water temperature Tp does not exceed 0 ° C. (“No” in step S17), that is, if there is a risk that the water in the pump chamber may freeze. In S33, as shown in FIGS. 2 and 4A, the pump motor control unit 65 executes a subroutine program of steps S35 to S41 related to the pump motor start control 2 under a low temperature condition.

  In step S35, as shown in FIG. 2 and FIG. 4A, the pump motor control unit 65 executes a positioning process aiming at a temperature rise in the pump chamber in order to prevent freezing of the impeller and the water circulation unit in the pump chamber. . In this positioning process, for example, the pump motor 34 is energized with a positioning current 1.2 to 2.0 times the normal temperature condition described above. As a result, intermittent currents are supplied to the U phase, V phase, and W phase of the motor coil to generate Joule heat to prevent freezing.

  In step S37, as shown in FIGS. 2 and 4A, the pump motor control unit 65 counts the number of times that the predetermined cycle time is repeated during the positioning process of step S35, and the count value is the predetermined number of times. It is determined whether or not. In short, the positioning process in step S35 is repeated until the result of the repeat count determination in step S37 is “Yes”.

  By the way, for example, when an intermittent current is supplied to the pump motor 34, it is necessary to take measures to prevent burning or thermal destruction. In this regard, in this embodiment, the pump motor control unit 65 prepares a table in which the correspondence relationship between the motor current energization mode and the motor coil temperature is stored in advance, and the motor current energization mode is set to burnout or heat. Limit reaching motor coil temperature leading to destruction. For this reason, the pump motor 34 can be protected from burning or thermal destruction without separately providing a sensor for detecting the motor coil temperature.

If the result of the determination of the number of repetitions in step S37 is “Yes”, in step S39, as shown in FIGS. 2 and 4A, the pump motor control unit 65 executes a synchronous operation process. In the synchronous operation process, the impeller is rotated after the temperature in the pump chamber is raised by the action of Joule heat by the positioning process in step S35. For this reason, it is possible to prevent damage to the impeller and the pump chamber due to water freezing. When the water in the water pipe 17b extending from the pump 33 to the hot water storage tank 31 is frozen, the water does not flow at all. In this case, the starting torque of the pump motor 34 is high, and the torque current Iq * > 0 (the motor current Iu and the torque correlate).

  In step S41, as shown in FIGS. 2 and 4A, the abnormality detection processing unit 77 of the pump motor control unit 65 performs the same excessive current determination as in step S25 during the synchronous operation processing in step S39. As a result of the determination of the excessive current in step S41, the pump motor control unit 65 advances the process flow to step S43 when it is determined that the excessive current has flowed, while the excessive current does not flow. When the determination is made, the process flow proceeds to step S47 as in step S25.

  In step S43, as shown in FIG. 2 and FIG. 4A, the pump motor control unit 65 causes the storage area of the microcomputer to store and notify the abnormal state related to “pump lock abnormality due to freezing” and to operate the pump motor 34. An abnormality detection process 2 for stopping the process is executed.

  In step S45, the pump motor 34 whose motor current Iu has been cut off by stopping its operation stops its operation. Thereby, the boiling operation is stopped.

  In step S47, as shown in FIG. 2 and FIG. 4A, the pump motor control unit 65 executes a speed increasing operation process. In this speed increase operation process, the pump motor control unit 65 sets the speed increase completion speed Naccelend as the target speed Ntg when the pump motor 34 is started, and the determination condition “actual speed Nre is increased in step S63 described later. The actual rotational speed Nre is increased in accordance with the rotational speed deviation ΔN between the actual rotational speed Nre and the target rotational speed Ntg (acceleration complete rotational speed) until the “completed rotational speed Naccelend” is satisfied.

In the acceleration process Nacc, an acceleration process according to the rotational speed deviation ΔN between the actual rotational speed Nre and the target rotational speed Ntg is performed. Specifically, for example, in the acceleration process Nacc corresponding to the rotational speed deviation ΔN, when the deviation ΔN is (−470 −1 / s) or less, the deviation ΔN is (deviation Δ−) at least 133 min −1 / s. 470 -1 / s) exceeds the, and, (- for 170 -1 / s) or less, at least 42 min -1 / s, the deviation ΔN exceeds the (deviation Δ-170 -1 / s) In the case of (0 −1 / s) or less, acceleration processing is performed at least for 6 min −1 / s. Note that the target rotation speed Ntg (speed increase completion rotation speed), the rotation speed deviation Δ, and the variable values of the acceleration process Nacc used in the speed increasing operation process can be appropriately changed according to the product specifications.

  In step S49, as shown in FIGS. 2 and 4B, the abnormality detection processing unit 77 of the pump motor control unit 65 determines whether or not the motor current Iu exceeds 0 during the speed increasing operation processing in step S47. This determination is performed. The phenomenon that the motor current Iu does not exceed 0 occurs when there is no water in the pump chamber. Therefore, it is possible to check whether or not the pump 33 is idling based on the determination result of step S49. As a result of the determination in step S49, when it is determined that the motor current Iu does not exceed 0, the pump motor control unit 65 advances the process flow to step S51, while the motor current Iu is 0. If it is determined that the value exceeds, the flow of processing proceeds to step S55.

  In step S51, as shown in FIG. 2 and FIG. 4B, the pump motor control unit 65 causes the storage area of the microcomputer to store and notify the abnormal state related to “abnormal pump operation” and to operate the pump motor 34. The abnormality detection process 3 to be stopped is executed.

  In step S53, the pump motor 34 whose motor current Iu has been cut off by stopping its operation stops its operation. Thereby, the boiling operation is stopped.

  If it is determined in step S49 that the motor current Iu exceeds 0 (the pump 33 is not idling), in step S55, as shown in FIGS. 2 and 4B, the pump motor The control unit 65 performs an overcurrent determination related to whether or not an excessive current has flowed through the pump motor 34 during the speed increasing operation processing according to step S47. This excessive current determination is performed based on whether or not the motor current Iu has exceeded an excessive current threshold Iu_max_th that is a characteristic value of a boundary that causes an abnormality of the pump motor 34. As a result of the determination of the excessive current in step S55, the pump motor control unit 65 advances the process flow to step S57 when it is determined that the excessive current has flowed, while the excessive current does not flow. If the determination is made, the flow of processing proceeds to step S63.

  In step S57, as shown in FIG. 2 and FIG. 4B, the pump motor control unit 65 repeats the loop processing of steps S17 to S55 until the preset number of retries (at least n = 2) is reached continuously. . However, before satisfying the condition of step S57, whether the pump inlet water temperature Tp is determined to be 0 ° C. or less (No) in step S17, or whether it is determined that an excessive current has flowed (Yes) in step S25, Alternatively, when it is determined in step S49 that the motor current Iu does not exceed 0 (the pump 33 is idling), the pump motor control unit 65 goes out of the loop processing of steps S17 to S55, Proceed with each process.

  In step S59, as shown in FIG. 2 and FIG. 4B, when the preset number of retries is continuously reached, the pump motor control unit 65 detects an abnormality related to “foreign matter contamination or clogging abnormality” in the storage area of the microcomputer. The abnormality detection process 4 is executed to store and notify the state and stop the operation of the pump motor 34.

  In step S61, the pump motor 34 whose motor current Iu has been cut off by stopping its operation stops its operation. Thereby, the boiling operation is stopped.

  On the other hand, if it is determined in step S55 that no excessive current flows, in step S63, the pump motor control unit 65 increases the actual rotational speed Nre as shown in FIGS. 2 and 4B. It is determined whether or not the rotation speed indicating the completion of the speed (target rotation speed Ntg at the start) has been reached. As a result of the determination in step S55, when the actual rotational speed Nre does not reach the target rotational speed Ntg, the pump motor control unit 65 returns the process flow to the speed increasing operation process in step S47, and sequentially performs the following processes. On the other hand, if the actual rotational speed Nre has reached the target rotational speed Ntg, the flow of processing is advanced to step S65.

  In step S65, as shown in FIG. 2 and FIG. 4B, the pump motor control unit 65 acquires pump incoming water temperature data detected by the pump incoming water temperature sensor 43.

  In step S67, as shown in FIGS. 2 and 4B, the target heating capacity processing unit 71 of the pump motor control unit 65 is based on the target boiling temperature Ttg set in step S15 and the deviation ΔT of the pump incoming water temperature Tp. Thus, the target rotational speed Ntg of the pump motor 34 for setting the pump incoming water temperature Tp to the target boiling temperature Ttg within a predetermined boiling time is set.

  In step S69, as shown in FIG. 2 and FIG. 4B, the pump motor control unit 65 determines that the motor current Iu during the speed increasing operation process in step S47 is a characteristic value that guarantees a stable operation of the pump motor 34. The operation mode of the pump motor 34 is determined based on whether or not the current value Iu_R is exceeded.

  Specifically, when the motor current Iu is equal to or less than the rated current value Iu_R, the pump motor control unit 65 determines that the normal mode for driving the pump motor 34 with the rated current value Iu_R or less should be selected. The case where the motor current Iu is equal to or less than the rated current value Iu_R is a case where the load imposed during the operation of the pump motor 34 is small. This is because the motor current Iu and the magnitude of the load have a positive correlation. For this reason, if the load imposed during the operation of the pump motor 34 is small, the motor current Iu need only be smaller than the rated current value Iu_R. Therefore, in this case, it is appropriate to select the normal mode.

  On the other hand, when the motor current Iu exceeds the rated current value Iu_R, the pump motor control unit 65 determines that the high load mode for driving the pump motor 34 should be selected within the range exceeding the rated current value Iu_R. . The case where the motor current Iu exceeds the rated current value Iu_R is a case where the load imposed during the operation of the pump motor 34 is large. This is because the motor current Iu and the magnitude of the load have a positive correlation. For this reason, if the load imposed during the operation of the pump motor 34 is large, the motor current Iu needs to be larger than the rated current value Iu_R. Therefore, in this case, it is appropriate to select the high load mode.

  As a result of the determination in step S69, the pump motor control unit 65 selects the normal mode (the mode in which the pump motor 34 is driven with the motor current Iu less than the rated current value Iu_R) as the operation mode, as shown in FIGS. 2 and 4B. In this case, the flow of the process is advanced to the normal operation process in the normal mode according to step S77, while the high load mode (the mode in which the pump motor 34 is driven with the motor current Iu exceeding the rated current value Iu_R) as the operation mode. Is selected, the process flow is advanced to the high load operation process in the high load mode according to the next step S71.

In step S71, as shown in FIGS. 2 and 4B, the pump motor control unit 65 operates in the high load mode in which the pump motor 34 is driven with the motor current Iu exceeding the rated current value Iu_R.
The rated current value Iu_R of the pump motor 34 means a current value that can be used stably in design. This rated current value Iu_R is generally determined with a margin. Therefore, in the pump motor 34 according to the present embodiment, the pump motor 34 can be used in a range exceeding the rated current value Iu_R as long as the limit value (including the lower limit value and the upper limit value) separately determined is not exceeded. it can.

  Here, in the heat pump water heater 11 shown in FIG. 1 (the same applies to the conventional heat pump water heater), the specifications of the piping related to the forward piping 17a and the backward piping 17b (total piping) connecting the heat pump unit 13 and the hot water storage unit 15 Length, height difference, etc.), outside air temperature, etc., according to the specified specifications (for example, the height difference of the pipe is in the range of +0.1 m to -3 m, the total pipe length is 15 m or less, and the bending part is within 10 places. If the outside air temperature Tot is -20 ° C or higher, etc., even if the pump motor 34 is operated in the normal mode, it is within a predetermined boiling time (boiling time guaranteed by this system). In principle, the boiling process can be completed.

  However, in the case of temporary problems such as foreign matter contamination, chalk clogging, water leakage, and air entrapment due to poor air venting in the hot water storage cycle, conventional heat pump water heaters have deteriorated heat exchange capacity and poor water circulation. Thus, the boiling process cannot be completed within a predetermined boiling time. In addition, when such a problem occurs temporarily, it is difficult to detect an abnormality.

  Therefore, in this embodiment, when the above-described problem occurs temporarily and the operation in the normal mode is continued, the heating capacity is insufficient and the boiling is performed within a predetermined boiling time. When there is a high probability that the heating process cannot be completed, the pump motor 34 is switched to the high load mode and operated at high speed to compensate for the lack of heating capacity and complete the boiling within a predetermined boiling time. I decided to aim. Further, during the operation in the high load mode, it is monitored whether or not the motor current Iu and the motor voltage are maintained at normal values, and if any abnormality is detected as a result of the monitoring, the pump motor 34 Appropriate abnormal processing including abnormal stop and abnormal state discrimination and display was performed.

  In step S71, as shown in FIGS. 2 and 4B, the pump motor control unit 65 operates in the high load mode in which the pump motor 34 is driven with the motor current Iu exceeding the rated current value Iu_R. The rated current value Iu_R of the pump motor 34 means a current value that can be used stably in design. This rated current value Iu_R is generally determined with a margin. For this reason, in the pump motor 34 according to the present embodiment, the pump motor 34 is used in a range that exceeds the rated current value Iu_R as long as it does not exceed the separately determined limit values (including the lower limit value Iu_L and the upper limit value Iu_H). be able to.

  In step S73, as shown in FIGS. 2 and 4B, the PAM control unit 83 of the pump motor control unit 65 performs PAM circuit processing related to generation of a DC voltage signal to be supplied to the PAM circuit 53. As a result, the PAM control unit 83 linearly boosts the motor voltage applied to the pump motor 34.

  In step S75, as shown in FIG. 2 and FIG. 4B, the field weakening control unit 85 of the pump motor control unit 65 receives the field magnetic flux of the pump motor 34 when a request to increase the rotational speed of the pump motor 34 occurs. It works to reduce the excitation current. Thereby, the field weakening control unit 85 increases the rotation speed of the pump motor 34.

  In step S77, as shown in FIGS. 2 and 4C, the abnormality detection processing unit 77 of the pump motor control unit 65 performs an excessive current determination during the operation of the pump motor. This overcurrent determination may be performed in the same procedure as in step S55. As a result of the determination of the excessive current in step S77, the pump motor control unit 65 advances the process flow to step S79 when it is determined that the excessive current has flowed (Yes), while the excessive current flows. If it is determined that there is not (No), the flow of processing proceeds to step S85.

  In step S79, as shown in FIGS. 2 and 4C, the pump motor control unit 65 repeatedly performs the loop processing of steps S17 to S77 until the preset number of retries (at least n = 2) is reached continuously. . However, before satisfying the condition of step S77, whether the pump water temperature Tp is determined to be 0 ° C. or lower (No) in step S17, or whether it is determined that no excessive current flows (No) in step S25, If it is determined in step S49 that the motor current Iu does not exceed 0 (No), or if it is determined in step S55 that an excessive current has flowed (Yes), the pump motor control unit 65 performs steps S17 to S17. The process goes out of the loop process of S77 and proceeds to each flow.

  In step S81, as shown in FIGS. 2 and 4C, when the preset number of retries is continuously reached, the pump motor control unit 65 displays an abnormal state related to “overcurrent abnormality” in the storage area of the microcomputer. The abnormality detection process 5 for stopping the operation of the pump motor 34 is executed while storing and notifying.

  In step S83, the pump motor 34 whose motor current Iu has been cut off by stopping its operation stops its operation. Thereby, the boiling operation is stopped.

  On the other hand, if it is determined in step S77 that an excessive current has flowed, the abnormality detection processing unit 77 of the pump motor control unit 65 causes the pump motor 34 to Perform overvoltage judgment during operation. In this overvoltage determination, the direct current motor voltage value linearly adjusted by the PAM control unit 83 instantaneously (for example, 25 ms) changes a predetermined overvoltage value (for example, a preset variable value such as 400 V). ) Based on whether or not. In addition, as a scene where it is determined that the voltage is excessive, for example, a step-out of the pump motor 34 during acceleration processing or deceleration processing, pump lock due to sudden foreign matter contamination or clogging may be assumed. it can.

  As a result of the overvoltage determination in step S85, the pump motor control unit 65 advances the process flow to step S87 when it is determined that the overvoltage is detected, but determines that the overvoltage is not exceeded. If it has been lowered, the process flow proceeds to step S91.

  In step S87, as shown in FIG. 2 and FIG. 4C, the abnormality detection processing unit 77 of the pump motor control unit 65 causes the storage area of the microcomputer to store and notify the abnormal state related to “overvoltage abnormality” and An abnormality detection process 6 for stopping the operation of the motor 34 is executed.

  In step S89, the pump motor 34 whose motor current Iu has been cut off by stopping its operation stops its operation. Thereby, the boiling operation is stopped.

  On the other hand, if it is determined in step S85 that the voltage is not excessive, in step S91, as shown in FIGS. 2 and 4C, the abnormality detection processing unit 77 of the pump motor control unit 65 It is determined whether the motor current Iu during operation of the motor 34 exceeds the rated current value Iu_R. As a result of the determination in step S91, when it is determined that the motor current Iu is equal to or less than the rated current value Iu_R (No), the pump motor control unit 65 advances the process flow to step S93, When it is determined that the motor current Iu exceeds the rated current value Iu_R, the process flow proceeds to step S107.

  In step S93, as shown in FIG. 2 and FIG. 4C, the pump motor control unit 65 acquires pump incoming water temperature data detected by the pump incoming water temperature sensor 43.

  In step S95, as shown in FIG. 2 and FIG. 4C, the pump motor control unit 65 determines whether or not the motor current Iu flowing during the operation of the pump motor 34 exceeds the lower limit value Iu_L. . As a result of the determination in step S95, when it is determined that the motor current Iu exceeds the lower limit value Iu_L (Yes), the pump motor control unit 65 advances the process flow to step S97, If it is determined that the motor current Iu is less than or equal to the lower limit value Iu_L, the flow of processing proceeds to step S103. Details of the processing in step S103 will be described later.

As a result of the determination in step S95, if it is determined that the motor current Iu exceeds the lower limit value Iu_L (Yes), in step S97, as shown in FIGS. 2 and 4C, the pump motor control unit 65 Then, the target rotation speed Ntg is changed to the maximum rotation speed (for example, a value that can be appropriately changed in advance, such as 6,500 −1 / s).

  In step S99, as shown in FIGS. 2 and 4C, the PAM control unit 83 of the pump motor control unit 65 converts the command value of the motor voltage adjusted to, for example, 260V to the maximum DC voltage value (for example, 285V or the like). To a value that can be changed as appropriate).

  In step S101, as shown in FIG. 2 and FIG. 4C, the pump motor control unit 65 changes the target rotational speed Ntg to the maximum rotational speed as shown in step S97 and step S99, and the motor voltage command value. Execute the forced acceleration process Nacc in which is changed to the maximum DC voltage value. Thereafter, the pump motor control unit 65 returns the process flow to step S65, and causes the process from step S65 to be performed.

In the forced acceleration process Nacc according to step S101, an acceleration process according to the rotation speed deviation ΔN between the actual rotation speed Nre and the target rotation speed Ntg is performed. Specifically, for example, in the forced acceleration process Nacc corresponding to the rotational speed deviation ΔN, when the rotational speed deviation ΔN is (−3,000 −1 / s) or less, the forced acceleration is performed at least at 760 min −1 / s. . Rotational speed deviation ΔN has exceeded (-3,000 -1 / s), and, (- 1,500 -1 / s) in the following cases, force accelerates at least 266min -1 / s. Further, the rotational speed deviation .DELTA.N is exceeded (rotation speed deviation ΔN-1,500 -1 / s), and, (- 470 -1 / s) in the following cases, forced at least 133min -1 / s Accelerate.

When the rotation speed deviation ΔN decreases, normal acceleration processing (rotation speed deviation ΔN is above the (-470 -1 / s), and (- 170 in the case of -1 / s) or less, at least 42 min -1 / S and the rotational speed deviation ΔN exceeds (rotational speed deviation ΔN−170 −1 / s) and (0 −1 / s) or less, at least 6 min −1 / s) return. By performing the forced acceleration process Nacc according to step S101, it is possible to prevent a decrease in the amount of flowing water even in the hot water storage cycle 16 even if, for example, air is trapped due to air bleeding failure.

  As a result of the determination in step S95, if it is determined that the motor current Iu is equal to or lower than the lower limit value Iu_L (No), in step S103, as shown in FIGS. The detection processing unit 77 stores / notifies an abnormal state related to “low load abnormality” in the storage area of the microcomputer and executes an abnormality detection process 7 for stopping the operation of the pump motor 34. The abnormal state related to this “low load abnormality” is caused by, for example, temporary air trapping of the circulation pump 33 or the like.

  In step S105, the pump motor 34 whose motor current Iu has been cut off by stopping its operation stops its operation. Thereby, the boiling operation is stopped.

  On the other hand, if it is determined in step S91 that the motor current Iu exceeds the rated current value Iu_R, in step S107, as shown in FIGS. 2 and 4C, the pump motor control unit 65 A determination is made as to whether or not the motor current Iu during operation of the pump motor 34 exceeds the upper limit current value Iu_H. The determination in step S107 is performed by referring to the upper limit current value Iu_H corresponding to the current rotational speed of the pump motor 34 in the motor current upper limit line 103 of FIG.

  As a result of the determination in step S107, when it is determined that the motor current Iu is equal to or greater than the upper limit current value Iu_H (Yes), the pump motor control unit 65 advances the process flow to step S109, When it is determined that the motor current Iu is less than the upper limit current value Iu_H (No), the process flow proceeds to step S123.

  If it is determined in step S107 that the motor current Iu is equal to or greater than the upper limit current value Iu_H, in step S109, the pump motor control unit 65 performs forced deceleration as shown in FIGS. 2 and 4C. Execute the process. Here, when the motor current Iu becomes equal to or higher than the upper limit current value Iu_H (when the pump motor 34 rotates at a high speed), for example, a scale component (calcium or the like crystallized in hard water of about 120 to 180 mg / liter is crystallized. Can be assumed to have accumulated in the water pipes 17a, 17b over time. In such a case, the pressure loss is increased, the heat exchange capacity is lowered, and consequently, boiling cannot be performed within a predetermined time. Therefore, forced deceleration processing appears.

In the forced deceleration process Ndec according to step S109, a deceleration process according to the rotational speed deviation ΔN between the actual rotational speed Nre and the target rotational speed Ntg is performed. Specifically, for example, in the forced deceleration process Ndec according to the rotational speed deviation ΔN, when the deviation ΔN is (3,000 −1 / s) or less, the forced deceleration is performed at least at −760 min −1 / s. When the deviation ΔN is not less than (1,500 −1 / s) and less than (3,000 −1 / s), forced deceleration is performed at least at −266 min −1 / s. When the deviation ΔN is not less than (470 −1 / s) and less than (1,500 −1 / s), forced deceleration is performed at least at −133 min −1 / s. When the rotational speed deviation ΔN decreases, the normal deceleration process (when the rotational speed deviation ΔN is (170 −1 / s) or more and less than (470 −1 / s), at least −42 min −1 / s, and When the rotational speed deviation ΔN is (0 −1 / s) or more and less than (170 −1 / s), at least −6 min −1 / s) is returned. In the forced deceleration process according to step S109, the speed is not reduced to a rotational speed lower than the minimum rotational speed Nmin.

  In step S111, as shown in FIGS. 2 and 4C, the pump motor control unit 65 determines whether or not the motor current Iu during operation of the pump motor 34 is less than the rated current value Iu_R. As a result of the determination in step S111, the pump motor control unit 65 determines that the motor current Iu is less than the rated current value Iu_R (Yes), that is, the pump motor 34 by the forced deceleration process in step S109. If the rotational speed of the above is excessively suppressed, the process flow is returned to step S65, and the processes after step S65 are performed. On the other hand, if it is determined that the motor current Iu is equal to or greater than the rated current value Iu_R, that is, if the rotational speed of the pump motor 34 is not sufficiently suppressed even by the forced deceleration process according to step S109, the process flow Is advanced to step S113.

As a result of the determination in step S111, if the rotational speed of the pump motor 34 is not sufficiently suppressed even by the forced deceleration process in step S109 (No), in step S113, the pump motor control unit 65 is shown in FIG. 2 and FIG. 4C. As described above, the target rotation speed Ntg is changed to the minimum rotation speed Nmin (for example, a value that can be changed in advance, such as 100 −1 / s).

  In step S115, as shown in FIGS. 2 and 4C, the pump motor control unit 65 acquires pump incoming water temperature data detected by the pump incoming water temperature sensor 43.

  In step S117, as shown in FIG. 2 and FIG. 4C, when the current operation state is maintained, the pump motor control unit 65 determines that the pump incoming water temperature Tp acquired in step S115 is the target boiling set in step S15. It is determined whether or not the temperature Ttg can be reached within a predetermined boiling time. The determination related to step S117 is performed in the target heating capacity processing unit 71 with reference to the maximum heating capacity that can be exhibited by the heat exchanger 21, the maximum rotation speed Nmax of the pump motor 34, and the like.

  If it is determined in step S117 that the pump inlet water temperature Tp cannot reach the target boiling temperature Ttg within the predetermined boiling time (No), in step S119, the process shown in FIGS. 2 and 4C is performed. As shown, the abnormality detection processing unit 77 of the pump motor control unit 65 stores and reports an abnormal state related to “overload abnormality” in the storage area of the microcomputer, and also stops the operation of the pump motor 34. 8 is executed.

  In step S121, the pump motor 34 whose motor current Iu has been cut off by stopping its operation stops its operation. Thereby, the boiling operation is stopped.

  On the other hand, as a result of the determination relating to step S107, it is determined that the motor current Iu is less than the upper limit current value Iu_H (when the pump operation corresponding to the target heating capacity process is being performed), or step S117. As a result of the determination, if it is determined that the pump water temperature Tp can reach the target boiling temperature Ttg within a predetermined boiling time (Yes), in step S123, as shown in FIG. 2 and FIG. 4C. In addition, the pump motor control unit 65 determines whether or not the current pump incoming water temperature Tp has reached the target boiling temperature Ttg.

  As a result of the determination relating to step S123, if it is determined that the current pump water temperature Tp does not reach the target boiling temperature Ttg (No), the pump motor control unit 65 proceeds to step S65. Return, and the processing from step S65 is performed. On the other hand, when it is determined that the current pumping water temperature Tp has reached the target boiling temperature Ttg (Yes), the pump motor control unit 65 regards that the boiling operation has ended, and performs a series of processing. End the flow.

(Relationship between the rotational speed N of the pump motor 34 and the motor current Iu)
Next, the relationship between the rotational speed N of the pump motor 34 and the motor current Iu will be described with reference to FIGS. FIG. 5 is a characteristic diagram showing the relationship between the rotational speed N of the pump motor 34 on the horizontal axis and the motor current Iu on the vertical axis. 6A and 6B are diagrams illustrating an installation environment example of the heat pump water heater 11 having a large pressure loss.

  The horizontal axis in FIG. 5 shows the minimum and maximum rotational speeds Nmin and Nmax that can be taken by the pump motor 34. Between these Nmin and Nmax, the first set value N1, the second set value N2, and the speed increasing completion rotational speed. Each set point Naccelend is plotted. In FIG. 5, an excessive current threshold line 101, a motor current upper limit line 103, a motor current rating line 105, a motor current lower limit line 107, and a set point 109 relating to the acceleration completion rotation speed are provided. It is represented.

  As shown in FIG. 5, the excessive current threshold line 101 is a line that represents an excessive current threshold Iu_max_th that the motor current Iu flowing through the pump motor 34 should not exceed. The excessive current threshold value Iu_max_th is a characteristic value at the boundary where the pump motor 34 is abnormal, and means the maximum current (demagnetization start current) that can flow through the pump motor 34. When the motor current Iu reaches the excessive current threshold value Iu_max_th, the pump motor control unit 65 forcibly stops the operation of the pump motor 34. This is to protect the pump motor 34 from abnormalities such as burnout.

  In this embodiment, the pump motor control unit 65 inputs digital data related to the motor current flowing through the pump motor 34 via the AD conversion unit 63, and performs vector calculation based on the input digital data related to the motor current, An estimated current value is obtained. In the present embodiment, the estimated value of the motor current is regarded as the motor current Iu, and the pump motor 34 is controlled.

  As shown in FIG. 5, the motor current upper limit line 103 is obtained when the rotational speed of the pump motor 34 is changed when the water existing in the water pipes 17a and 17b having a large pressure loss is circulated by the circulation pump 33. It is a characteristic graph showing the operation limit which connected between each point which concerns on each upper limit electric current value Iu_H by piecewise linear interpolation. Here, each point relating to the upper limit current value Iu_H must not exceed the overcurrent threshold line 101. The upper limit current value Iu_H is a characteristic value at a boundary with a high probability that the pump motor 34 is abnormal. An installation example of the heat pump water heater 11 used in the experiment for obtaining such a characteristic graph is shown in FIGS. 6A and 6B.

In the heat pump water heater 11A illustrated in FIG. 6A, a torii pipe having a height of h1 = 1 m with respect to the base surface is provided in the middle of the pipe path L1, and water pipes 17a and 17b having a large pressure loss are configured. . In addition, in the heat pump water heater 11B illustrated in FIG. 6B, a water pipe having a large pressure loss is provided in the middle of the pipe path L2 connecting the hot water storage tank 31 and the circulation pump 33 with a height difference of h2 = 3 m with respect to the base surface. 17a and 17b are configured.
Although the description is simplified in FIG. 6A, the water pipe 17 b is piped up to the top of the hot water storage tank 31. This also applies to FIG. 6B described later.

  In setting the motor current upper limit line 103, as shown in FIG. 5, not only the upper limit current value Iu_H is considered, but, for example, along the motor current rating line 105, the getter is set by an arbitrary α value. May be set. That is, as shown in FIG. 5, the motor current upper limit line 103 in this case includes the 0th set point N0 (Iu_H0 = Iu_R0 + α0), the first set point N1 (Iu_H1 = Iu_R1 + α1), and the second set point N2 (Iu_H2). = Iu_R2 + α2) is set by connecting the points by piecewise linear interpolation. In addition, a unique set point that is not set along the motor current rating line 105 but is connected by arbitrarily optimal set piecewise linear interpolation with a set point that is different from each point related to the upper limit current value Iu_H. The limit line may be used.

  If a motor current Iu exceeding the motor current upper limit line 103 flows, the pump motor control unit 65 suppresses an increase in the motor current Iu by executing a forced deceleration process according to step S109 in FIG. 4C. This prevents the motor current Iu from reaching the overcurrent threshold line 101. If the motor current Iu falls below the rated current value during the forced deceleration process according to step S109, the pump motor control unit 65 returns the process flow to step S65 in FIG. 4B, and executes the processes after step S65. .

  As shown in FIG. 5, the motor current rating line 105 is a rated operation in which the points related to the respective rated current values Iu_R are connected by piecewise linear interpolation when the rotational speed of the pump motor 34 is changed. It is a characteristic graph to represent. The rated current value Iu_R guarantees stable operation of the pump motor 34 when the heat pump water heater 11 is installed in a standard installation state (for example, a pipe length of 5 m, a height difference of 1 m, 5 bends, and no torii pipe). The characteristic value to be used. The rated current value Iu_R is set to a specific value according to the specification of the pump motor 34. When the specification change of the pump motor 34 occurs, the rated current value Iu_R can be changed according to the change contents.

When setting the motor current rating line 105, the following singular points are plotted on the horizontal axis related to the rotational speed of the graph shown in FIG. That is,
Maximum speed Nmax> n-th set point Nn (Iu_Rn)> second set point N2 (Iu_R2)> first set point N1 (Iu_R1)> minimum speed Nmin> origin N0 (Iu_R0)

  In this motor current rating line 105, as shown in FIG. 5, at least two settings are made so that the line between the second set point N2 (Iu_R2) and the first set point N1 (Iu_R1) can be connected by linear interpolation. Set a point. For example, if the load is the same as the second set point N2 (Iu_R2) until reaching the maximum rotation speed Nmax (maximum pump operation) in the region of the rotation speed higher than the second setpoint N2 (Iu_R2) Linear interpolation between the point N2 (Iu_R2) and the maximum rotational speed Nmax is made by connecting with a horizontal inclination line.

  On the other hand, when the second set point N2 (Iu_R2) and the maximum rotational speed Nmax have different loads, the set point between the two is increased as necessary and connected by optimal piecewise linear interpolation. What should I do?

  Similarly, in the region of the rotational speed lower than the first set point N1 (Iu_R1), as shown in FIG. 5, the first set point N1 (Iu_R1) is reached until reaching the minimum rotational speed Nmin or the origin N0 (Iu_R0). When the load is the same, linear interpolation between the first set point N1 (Iu_R1) and the minimum rotation speed Nmin is made to connect with a horizontal inclination line. However, if the first set point N1 (Iu_R1) and the minimum rotational speed Nmin have different loads, the set point between the two is increased as necessary and connected by optimal piecewise linear interpolation. do it.

  Furthermore, if the load has different inflection points between the first set point N1 (Iu_R1) and the second set point N2 (Iu_R2), increase the set points between the two as necessary. Therefore, it is only necessary to connect by optimal piecewise linear interpolation.

  As shown in FIG. 5, the motor current lower limit line 107 is such that the water pipes 17 a and 17 b in the hot water storage cycle 16 are caught in air due to poor air bleeding or water leakage, and the pipes 17 a and 17 b have a constant water pressure. 6 is a characteristic graph showing an operation limit obtained by connecting the points related to the respective lower limit current values Iu_L by piecewise linear interpolation when the rotational speed of the pump motor 34 is changed in a low load state not satisfied by. The lower limit current value Iu_L is a characteristic value at a boundary with a high probability that the pump motor 34 is abnormal.

  In setting the motor current lower limit line 107, as shown in FIG. 5, not only the lower limit current value Iu_L is taken into account, but, for example, the motor current rating line 105 is lowered by an arbitrary β value. May be set. In this case, the motor current lower limit line 107 is between the origin N0 (Iu_L0 = Iu_R0−β0), the first set point N1 (Iu_L1 = Iu_R1−β1), and the second set point N2 (Iu_L2 = Iu_R2−β2). Are connected by piecewise linear interpolation. Note that β1, β2, and β3 may be different from each other. In this way, it is possible to arbitrarily adjust the slope of the line segment connecting the set points. Further, the same number of set points as the motor current lower limit line 107 can be set as the set points related to the motor current rating line 105.

  If a motor current Iu below the motor current lower limit line 107 flows, the pump motor control unit 65 increases the motor current Iu by executing the forced acceleration process according to steps S97 to 101 in FIG. 4C. As a result, the motor current Iu is prevented from falling below the motor current lower limit line 107. Further, by drawing water into the pump chamber, the amount of water in the water pipes 17a and 17b is ensured, and at the same time, the motor current Iu is increased up to the rated current value Iu_R.

  The set point Naccelend related to the acceleration completion rotation speed (target rotation speed at start-up) can be arbitrarily set as shown in FIG. The set point Naccelend relating to the completed rotation speed is less than the first set point N1. Note that this set point Naccelend is a state in which there is no water in any of the water pipes 17a and 17b and in the pump chamber in the speed increasing operation processing at the start of the pump motor 34 according to steps S47 to S63 shown in FIG. 4A ( Under the motor current is substantially equal to “0”), the upper limit rotational speed for preventing idling of the pump 33 is set.

(Operational effect of the pump motor control device 49 of the heat pump water heater 11)
Next, the effect of the pump motor control device 49 according to the present embodiment will be described with reference to FIG. FIG. 7 is an explanatory diagram showing the characteristics of the boiling temperature and the boiling time when the pump motor control device 49 according to the present embodiment is applied, in comparison with the comparative example.

  First, when the target boiling temperature is set to “90 ° C.” and the hot water tank 31 is tried to be filled with hot water at the target boiling temperature with respect to the condition for determining when the boiling is completed. An example is considered. In this case, the vicinity of the top of the hot water storage tank 31 is quickly filled with hot water having the target boiling temperature “90 ° C.”. On the other hand, in the vicinity of the bottom of the hot water storage tank 31, generally low-temperature tap water (water temperature varies depending on the season and region. For example, 10 to 30 ° C.) is introduced. For this reason, at the initial stage of the boiling operation, the vicinity of the bottom of the hot water storage tank 31 is filled with low-temperature water. Further, in the vicinity of the middle part of the hot water storage tank 31, high temperature water near the top of the hot water storage tank 31 and low temperature water near the bottom of the hot water storage tank 31 are mixed. For this reason, in the initial stage of the boiling operation, the vicinity of the center of the hot water storage tank 31 is filled with medium-temperature water (for example, 50 to 70 ° C.).

  The first determination mode for determining the end of the boiling operation using the detection value of the hot water storage sensor 31a located near the top of the hot water storage tank 31 is when the completion of boiling in a relatively short boiling time is desired. Preferably used. For example, when hot water is used in the daytime, the boiling operation is performed for the purpose of supplementing about 20 to 30% of hot water in the entire hot water storage tank 31.

  Moreover, the 2nd determination aspect which determines the completion | finish of a boiling operation using the detected value of the hot water storage sensor 31c located in the center vicinity of the hot water storage tank 31 is, for example in the middle of the night when the outside temperature is about 16-25 degreeC. It is preferably used when boiling slowly over time. For example, the boiling operation is performed for the purpose of supplementing about 55 to 60% of hot water in the entire hot water storage tank 31.

  Furthermore, the 3rd determination aspect which determines the completion | finish of boiling operation using the detected value of the hot water storage sensor 31e located near the bottom part of the hot water storage tank 31 is, for example, in the middle of the night when the outside air temperature is about 2 to 7 ° C. It is preferably used when boiling slowly over time. For example, the boiling operation is performed for the purpose of supplementing approximately 65 to 70% of hot water in the entire hot water storage tank 31.

  The detection value of the pump water temperature sensor 43 is in the range of 55 ° C. to 65 ° C. instead of or in addition to the determination based only on the water temperatures of the top, middle, and bottom regions of the hot water storage tank 31. You may comprise so that the completion of boiling may be determined using the effect as a boiling end condition.

  Here, using the heat pump water heater 11A having a large pressure loss in the installation environment shown in FIG. 6A, the characteristics of the boiling temperature and the boiling time when the pump motor control device 49 according to the present embodiment is applied, A description will be given in comparison with a comparative example (not applying the pump motor control device 49 according to the present embodiment). Note that the most severe third determination mode was used as the type of boiling completion determination. The target boiling temperature was set to “90 ° C.”.

  When the characteristics of the boiling temperature and the boiling time when the pump motor control device according to the comparative example is applied, as shown in FIG. 7, the boiling time until the target boiling temperature “90 ° C.” is reached. Was about 8 hours.

  On the other hand, when the characteristics of the boiling temperature and the boiling time when the pump motor control device 49 according to the present embodiment is applied are evaluated, as shown in FIG. 7, the target boiling temperature “90 ° C.” is obtained. The total boiling time was about 6 hours. Therefore, according to the pump motor control device 49 according to the present embodiment, the boiling could be completed about two hours earlier than the comparative example.

[Other Embodiments]
The embodiment described above shows an embodiment of the present invention. Therefore, the technical scope of the present invention should not be limitedly interpreted by these. This is because the present invention can be implemented in various forms without departing from the gist or main features thereof.

  For example, in the description of the present embodiment, the example in which the circulation pump 33 is provided in the heat pump unit 13 has been described, but the present invention is not limited to this example. The pump motor control device 49 according to the present invention may be applied to the heat pump water heater 11 in which the hot water storage unit 15 is provided with the circulation pump 33.

  In the description of the present embodiment, the example in which the circulation pump 33 is provided in the middle of the water pipe 17a from the hot water storage tank 31 to the heat exchanger 21 has been described. However, the present invention is not limited to this example. The circulation pump 33 may be provided in the middle of the water pipe 17 b extending from the heat exchanger 21 to the hot water storage tank 31.

  Finally, as the heat pump water heater 11 according to the embodiment of the present invention, a mode in which the heat pump unit 13 and the hot water storage unit 15, which are separate from each other, are connected to each other via the outward piping 17a and the backward piping 17b, respectively. Although illustrated and described, the present invention is not limited to this example. The aspect of the heat pump water heater 11 in which the heat pump unit 13 and the hot water storage unit 15 are integrally configured, and the constituent members 13 and 15 are connected to each other via the forward piping 17a and the backward piping 17b, respectively. Included in range range.

11 Heat pump water heater 13 Heat pump unit 15 Hot water storage unit (liquid storage unit)
17a, 17b Outward piping, return piping (liquid piping)
21 Heat exchanger (heating unit)
31 Hot water storage tank (tank)
33 Circulation pump (pump)
34 Pump motor 43 Pump water temperature sensor (suction side liquid temperature detector)
59 AD converter (motor voltage detector)
63 AD converter (motor current detector, motor rotation speed detector)
65 pump motor control unit 73 target boiling condition setting unit 75 vector control unit 77 abnormality detection processing unit 83 PAM control unit 85 field weakening control unit

Claims (12)

  1. A tank for storing a liquid supplied from a liquid supply source and a liquid supplied to a liquid supply destination, and sucking a low-temperature liquid from the tank, and discharging the sucked low-temperature liquid to a heating unit and supplying the heated liquid to the tank In a storage-type liquid heating and supply apparatus having a storage cycle in which a returning pump is connected in communication via a liquid pipe,
    A pump motor for driving the pump;
    A suction side liquid temperature detection unit for detecting a suction side liquid temperature of the heating unit;
    A motor current detector for detecting a motor current flowing in the pump motor;
    A motor voltage detector for detecting a motor voltage applied to the pump motor;
    A target boiling condition setting section for setting a target boiling temperature and boiling time;
    The suction side liquid temperature of the heating unit detected by the suction side liquid temperature detection unit, the motor current detected by the motor current detection unit, the motor voltage detected by the motor voltage detection unit, and the target boiling point A pump motor control unit that calculates the operating load of the pump motor based on the target boiling condition set by the raising condition setting unit and controls the rotational speed of the pump motor based on the calculated operating load When,
    With
    The pump motor control unit, when the calculated operating load is required to flow a motor current exceeding a rated current value, which is a characteristic value that guarantees stable operation of the pump motor, Operate in a high load mode in which a motor current exceeding the rated current value flows to the pump motor so that the liquid temperature reaches the target boiling temperature within the boiling time.
    A pump motor control device characterized by that.
  2. The pump motor control device according to claim 1,
    A motor rotation speed detector for detecting the rotation speed of the pump motor;
    The pump motor controller is
    A vector controller for variably controlling the magnitude of the motor current;
    A PAM controller that variably controls the magnitude of the motor voltage;
    With
    At least one of the vector control unit and the PAM control unit is at least one of the motor current and the motor voltage based on the rotation speed of the pump motor detected by the motor rotation speed detection unit. The rotational speed of the pump motor is controlled by variably controlling the size of
    A pump motor control device characterized by that.
  3. The pump motor control device according to claim 1 or 2,
    The pump motor control unit further includes a field weakening control unit that reduces a field magnetic flux of the pump motor.
    A pump motor control device characterized by that.
  4. The pump motor control device according to any one of claims 1 to 3,
    The pump motor controller is
    When detecting an abnormal state of the pump motor, further comprising an abnormality detection processing unit for performing an abnormality detection process for stopping the operation of the pump motor;
    Detection of an abnormal state of the pump motor is performed based on the motor current or the motor voltage.
    A pump motor control device characterized by that.
  5. The pump motor control device according to claim 4,
    The abnormality detection processing unit detects an abnormality of the pump motor before the rotational speed at the start of the pump motor reaches a preset target rotational speed. When the excessive current value that is the characteristic value of the boundary to be exceeded is exceeded, the abnormality detection processing is performed assuming that the pump is locked abnormally.
    A pump motor control device characterized by that.
  6. The pump motor control device according to claim 5,
    The abnormality detection processing unit freezes the pump when the pump lock abnormality is detected when the suction side liquid temperature of the heating unit detected by the suction side liquid temperature detection unit is 0 degrees Celsius or less. An abnormality detection process is performed assuming that the lock is abnormal.
    A pump motor control device characterized by that.
  7. The pump motor control device according to claim 4,
    The abnormality detection processing unit, when the motor current during the speed increasing operation processing of the pump motor does not increase before the rotational speed at the start of the pump motor reaches a preset target rotational speed, An abnormality detection process is performed assuming that the pump is idling.
    A pump motor control device characterized by that.
  8. The pump motor control device according to claim 7,
    The abnormality detection processing unit is a characteristic value of a boundary at which the motor current increases and causes an abnormality of the pump motor before the rotation speed at the start of the pump motor reaches a preset target rotation speed. When a certain excessive current value is exceeded, the pump is considered to be mixed with foreign matter or clogged, and an abnormality detection process is performed.
    A pump motor control device characterized by that.
  9. The pump motor control device according to claim 4,
    When the motor current during normal operation of the pump motor exceeds an excessive current value that is a characteristic value of a boundary causing the abnormality of the pump motor, the abnormality detection processing unit regards it as an excessive current abnormality of the pump. Anomaly detection processing,
    A pump motor control device characterized by that.
  10. The pump motor control device according to claim 4,
    When the motor voltage during normal operation of the pump motor exceeds an excessive voltage value that is a characteristic value of a boundary causing the abnormality of the pump motor, the abnormality detection processing unit regards the pump as an excessive voltage abnormality. Anomaly detection processing,
    A pump motor control device characterized by that.
  11. The pump motor control device according to claim 4,
    The abnormality detection processing unit is configured such that the motor current during normal operation of the pump motor is not more than the rated current value and not more than a lower limit current value that is a characteristic value of a boundary having a high probability of causing an abnormality of the pump motor. In the case, the abnormality detection processing is performed considering the low load abnormality of the pump.
    A pump motor control device characterized by that.
  12. The pump motor control device according to claim 4,
    The abnormality detection processing unit has a motor current during normal operation of the pump motor that exceeds the rated current value and is equal to or higher than an upper limit current value that is a characteristic value of a boundary that is likely to cause an abnormality of the pump motor. When the determination is made that the suction side liquid temperature of the heating unit cannot reach the target boiling temperature within the boiling time, it is regarded as an abnormal overload of the pump and is detected as abnormal. Process,
    A pump motor control device characterized by that.
JP2011110756A 2011-05-17 2011-05-17 Pump motor control device Pending JP2012241947A (en)

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CN105276654A (en) * 2014-07-07 2016-01-27 三菱电机株式会社 Hot water apparatus and failure notification method for hot water apparatus
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