JP4655692B2 - Motor and pump equipped with the same - Google Patents

Description

  The present invention relates to a motor in which a rotor is rotationally driven by a stator and a pump including the motor.

  For example, a brushless motor includes a rotor and a stator, and a switching element is connected to the stator. The motor further includes a position detector that detects the position of the rotor and a controller that drives the switching element. Has been proposed (see, for example, Patent Document 1).

When the motor is used, it has a function of controlling the speed of the motor by inputting a signal for controlling the speed or the rotational speed from the outside and controlling the energization to the stator by a switching element (for example, Patent Document 1). reference).
JP-A-5-260784

  However, in the motor described in (Patent Document 1) of the prior art, when a signal for controlling the speed or the rotational speed input from the outside is input to the control unit before the voltage applied to the switching element. When the control unit starts controlling the switching element first and a voltage is applied to the switching element in that state, the load on the switching element may increase.

  The present invention solves such a conventional problem, and an object thereof is to provide a motor that can reduce the burden on the switching element and can be driven accurately at all times, and a pump including the motor.

In order to achieve the above object, the present invention includes a rotor on which magnets are arranged, a stator that drives the rotor, and a switching element that is connected to the stator and energizes the stator, and detects the position of the rotor. position detecting means for a control unit for controlling the switching element to output a control signal based on the speed command signal input from the position and the outside of the rotor detected in the switching element by the position detection means, to the switching element and a voltage detecting means for detecting a voltage applied, the speed command signal for transmitting a speed command signal to the controller upon detection of a voltage applied to the switching element by the voltage detecting means at the start of rotation of said rotor It is characterized by providing a transmission means.

  As a result, it is possible to achieve the effect of transmitting the speed command signal to the control unit when the voltage detecting means for detecting the voltage application to the switching element detects the voltage application to the switching element.

  The present invention has an effect that a brushless motor can be driven accurately at all times with less burden on the switching element.

An embodiment of the present invention includes a rotor on which a magnet is disposed, a stator that drives the rotor, and a switching element that is connected to the stator and energizes the stator, and detects the position of the rotor. a control unit for controlling the switching element to output a control signal based on the speed command signal input from the position and the outside of the rotor detected by the position detecting means to the switching element, for detecting a voltage applied to the switching element and a voltage detecting means, so as to provide a speed command signal transmitting means for transmitting the speed command signal to the controller upon detection of a voltage applied to the switching element by the voltage detection means at the start of rotation of said rotor It is a thing.

  As a result, when the voltage detecting means for detecting the voltage application to the switching element detects the voltage application to the switching element, the speed command signal can be transmitted to the control unit, and the burden on the switching element is small and accurate at all times. Can drive a brushless motor.

  In addition, the stator, the switching element, the position detection unit, the control unit, the voltage detection unit, and the speed command signal transmission unit may be integrally formed with a thermosetting resin.

  In this case, it is possible to realize a dustproof / waterproof structure without using an integrally molded resin part as an outer shell or using special dustproof / waterproof means, and further adopt a heat dissipation structure using the integrally molded resin as a heat dissipation material. be able to.

  Furthermore, if the motor of this invention is used for a pump, the usability of a pump can be improved greatly.

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

Example 1
As shown in the block diagram of the motor shown in FIG. 1 of the present invention, there is a rotor 1 in which magnets are arranged, and a stator 2 for driving the rotor 1 is arranged. Is connected to the switching element 3.

  The position detecting means 4 for detecting the position of the rotor 1 is connected to a control section 5 for controlling the switching element 3 based on the position of the rotor 1 detected by the position detecting means 4 and the speed command signal 8 inputted from the outside. ing.

  Between the switching element 3 and the converter 9, voltage detecting means 6 for detecting that a voltage is applied to the switching element 3 is arranged, and the voltage detecting means 6 detects the voltage application to the switching element 3. Then, a speed command signal transmission means 7 for transmitting a speed command signal 8 to the control unit 5 is connected.

  With the above configuration, the operation of the motor in the first embodiment will be described with reference to FIG.

  When a voltage is applied from the converter 9 to the switching element 3, the voltage detection means 6 arranged between the switching element 3 and the converter 9 detects that the voltage is applied to the switching element 3, and the voltage detection signal is transmitted to the switching element 3. It outputs to the command signal transmission means 7.

  The speed command signal transmission means 7 disposed between the speed command signal 8 input from the outside and the control unit 5 can transmit the speed command signal 8 to the control unit 5 by the voltage detection signal output from the voltage detection means 6. As a result, the speed command signal 8 is input to the control unit 5.

  The control unit 5 controls the switching element 3 from position information output from the position detection means 4 arranged at a position where the position of the rotor 1 can be detected and the speed command signal 8 transmitted from the speed command signal transmission means 7. The rotor 1 is rotationally driven by energizing the stator 2 by controlling the switching element 3.

  As described above, according to the first embodiment, it is possible to detect that a voltage is applied to the switching element 3 and to input the speed command signal 8 to the control unit 5 while the voltage is applied to the switching element 3. .

  Therefore, it is possible to provide a brushless motor that can start controlling the switching element 3 in a state in which a voltage is always applied to the switching element 3 and that can be always driven accurately without a sudden load on the switching element 3.

  In the above embodiment, the position detecting means 4 is used for detecting the position of the rotor 1. However, a sensorless type configuration that detects the position of the rotor 1 from the winding voltage and winding current of the stator 2 may be used.

(Example 2)
As shown in the cross-sectional view of the stator portion of the motor integrally molded with the thermosetting resin shown in the second embodiment of the present invention in FIG. 2, the driving device 12 includes the switching element 3, the position detecting means 4, the control portion 5, the voltage The detection means 6 and the speed command signal transmission means 7 are mounted on at least one substrate.

  The driving device 12 is connected to the stator 2 by a pin 14 electrically connected to a winding provided on the stator 2.

  With the drive device 12 and the stator 2 electrically connected, the inner diameter of the stator 2 is inserted into the resin curing mold, and the thermosetting resin 13 is put on the resin curing upper mold. The stator is completed by injection.

  With the above configuration, by integrally molding the thermosetting resin 13 with the drive device 12 electrically connected to the stator 2, the integrally molded resin portion can be used as a motor shell, and the rotor 2 In combination, a robust brushless motor can be provided.

  Further, since the outer portion is formed of the thermosetting resin 13, it is resistant to intrusion of dust and water, can be provided with a dustproof / waterproof function, and is further integrally thermoset. A heat dissipation structure can be provided by using the resin 13 as a heat dissipation material.

(Example 3)
As shown in the cross-sectional view of the pump shown in Embodiment 3 of the present invention in FIG. 3, the drive device 12 is electrically connected to the stator 2 to control the energization of the stator 2.

  The partition plate 16 made of PPS resin is inserted into the mold, and the stator 2 connected to the driving device 12 is inserted on the partition plate 16 with the inner diameter as the center, and the upper mold for thermosetting resin is inserted. And the thermosetting resin 13 is injected to form a finished stator product.

  A bearing portion for fixing a shaft 17 made of ceramic is provided inside the partition plate 16, and a minute gap is provided in the outer diameter of the shaft 17 so that the bearing 18 is rotatably installed.

  A magnet 19 and an impeller 20 are integrally formed on the bearing 18 as an impeller finished product, and the impeller finished product is rotatable about the shaft 17.

  A pump case 21 having a pump suction port 22 and a pump discharge port 23 is attached to the outside of the impeller 20 with a tightening screw 24. An O-ring 25 is provided to prevent water leakage from the fitting portion between the partition plate 16 and the pump case 21.

  In the above configuration, the operation of the pump including the motor in the third embodiment will be described with reference to FIG.

  The liquid storage tank and the suction port 22 of the pump case 21 are piped, and the discharge port 23 is piped to a place where it is desired to be transferred by the pump.

  Next, a liquid is injected into the pump chamber surrounded by the inside of the partition plate 16 and the inside of the pump case 21, and the liquid flow path of the suction port 22 and the pump chamber are filled with the liquid.

  When the power supply and speed command signal 8 is input to the terminal of the driving device 12, the stator 2 is energized, a rotational force acts on the magnet, and the impeller finished product rotates.

  As a result, the liquid in the pump chamber is stirred by the impeller 20, and the liquid is discharged from the discharge port 23 by centrifugal force, and the suction port 22 has a negative pressure, so that the liquid in the liquid storage tank is sucked and the blade Invade the car 20.

  Thus, the liquid in a liquid storage tank is pressurized by a pump, and the liquid is transferred.

  As described above, according to the third embodiment, since the pump can be configured by using the brushless motor 11 that can be driven accurately at all times without a sudden load on the switching element 3, the usability of the pump is greatly increased. Can be increased.

  In the above embodiment, PPS resin is used as the material of the partition plate, but stainless steel, carbon-containing PPS resin, or the like may be used.

  The motor of the present invention and the pump equipped therewith can be used as a fuel cell and cogeneration motor and pump.

1 is a block diagram of a motor shown in Embodiment 1 of the present invention. Cross-sectional view of a stator portion of a motor integrally molded with a thermosetting resin shown in Embodiment 2 of the present invention Cross-sectional view of the pump shown in Example 3 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor 2 Stator 3 Switching element 4 Position detection means 5 Control part 6 Voltage detection means 7 Speed command signal transmission means 8 Speed command signal 9 Converter 10 Power supply 11 Brushless motor 12 Drive device 13 Thermosetting resin 14 Pin 15 Insulator 16 Partition plate 17 shaft 18 bearing 19 magnet 20 impeller 21 pump case 22 suction port 23 discharge port 24 tightening screw 25 O-ring

Claims (3)

A rotor on which a magnet is disposed; a stator that drives the rotor; a switching element that is connected to the stator and energizes the stator; a position detecting unit that detects the position of the rotor; and a position detecting unit that detects the rotor and a control unit for controlling the switching element control signal based on the input speed command signal position and from the outside of the rotor and outputs a switching element, a voltage detection means for detecting a voltage applied to the switching element, motor, wherein the voltage detection means providing the speed command signal transmitting means for transmitting the speed command signal to the controller upon detection of a voltage applied to the switching element at the start of rotation of the rotor.   2. The motor according to claim 1, wherein the stator, the switching element, the position detection means, the control section, the voltage detection means, and the speed command signal transmission means are integrally molded with a thermosetting resin.   A pump comprising the motor according to claim 1.

Images