CN110221207A - A kind of device and method for testing PG motor feedback circuit - Google Patents

Abstract

The present invention provides a device and method for testing the feedback circuit of the PG motor. The device for testing the feedback circuit of the PG motor includes: a power supply module, which is used to provide the working voltage required by the feedback circuit of the PG motor; A connecting wire connected to the PG motor to be tested; a display module for receiving and displaying the rotational speed signal sent by the feedback circuit of the PG motor. The invention solves the problem that the existing equipment is not easy to carry and expensive, and the function is far greater than the need, resulting in waste.

Description

A device and method for testing PG motor feedback circuit

technical field

The invention relates to the technical field of air conditioning, in particular to a device and method for testing a feedback circuit of a PG motor.

Background technique

The PG motor is a motor with a Hall element. The output signal of the Hall element can be used to determine the speed of the motor. Since the speed of the PG motor is not affected by the change of the air conditioner load and the change of the power supply voltage, and the control accuracy is very high, therefore, PG motors are widely used in various air conditioning units.

The feedback circuit of the PG motor is prone to defects during mass production. Among the various adverse symptoms of PG motors, the failure of the feedback circuit accounts for a large proportion of the adverse symptoms, so the feedback circuit needs to be detected emphatically. The current testing equipment includes a control chip, a speed control module, an alarm system, and a high and low voltage protection system. The entire testing equipment is expensive and difficult to carry. Moreover, when the PG motor feedback circuit is fully inspected separately before the PG motor is assembled into the home appliance in the home appliance assembly factory, multiple sets of this expensive equipment need to be configured, which again causes redundant functions and waste.

It can be seen that there is a need for a low-cost device that can quickly detect the feedback circuit.

Contents of the invention

The technical problem solved by the present invention is to provide a device and method for testing the feedback circuit of PG motors, so as to solve the problem that the current equipment is not easy to transport and expensive, and its functions are far greater than required, resulting in waste.

In order to solve the above problems, the technical scheme adopted in the present invention is as follows:

According to one aspect of the present invention, a device for testing a PG motor feedback circuit is provided, which includes:

The power module is used to provide the working voltage required by the PG motor feedback circuit;

A connection module, which includes a connection wire for being connected to the PG motor to be tested;

The display module is used for receiving and displaying the rotational speed signal sent by the feedback circuit of the PG motor.

The test device of the invention is low in cost, convenient to carry, and can quickly detect the feedback circuit of the PG motor.

In some embodiments of the present invention, the connection module also includes:

Terminal (3), which is used in conjunction with the terminals used in the PG motor feedback circuit; wherein,

The terminal transmits the voltage and current output by the power supply module to the PG motor feedback circuit and the rotational speed signal sent by the PG electrode feedback circuit to the display module through multiple pins included.

Terminals can prevent misplugging and reduce the number of times of plugging.

In some embodiments of the present invention, the power module includes:

dry battery;

The three-terminal voltage stabilizing block is used to stabilize the voltage of the dry battery, so that the output voltage of the power module matches the working voltage required by the PG motor feedback circuit.

After the voltage of the dry battery passes through the three-terminal voltage stabilizing block, it can output the working voltage required by the PG motor feedback circuit, avoiding the need to provide different power supplies for different PG motor feedback circuits, and improving the universality of use of the test device.

In some embodiments of the present invention, the Vin port of the three-terminal voltage stabilizing block is connected to the positive pole of the dry battery;

The GND port of the three-terminal voltage regulator block is connected to the negative pole of the dry battery and the voltage negative pole of the terminal, and the GND port is also connected to the display module and then connected to the signal terminal of the terminal;

The Vout port of the three-terminal voltage stabilizing block is connected to the positive voltage of the terminal.

In some embodiments of the invention, the display module includes LEDs.

In some embodiments of the present invention, the LED uses a model with a voltage drop value less than 5V and an operating current less than 20mA.

In some embodiments of the present invention, the display module further includes a current limiting resistor connected in series with the LED, wherein,

The resistance R of the current limiting resistor is: R=(U1-U2)/I;

Among them, U1 is the output level of the signal line of the PG motor feedback circuit, U2 is the voltage drop value of the LED, and I is the working current of the LED;

The power of the current limiting resistor is greater than (I*U2). The resistance R thus defined can ensure the normal operation of the LED for a long time.

According to another aspect of the present invention, there is also provided a testing method for the testing device as described above, comprising the following steps:

S1. Connect the PG motor feedback circuit to the corresponding position of the above-mentioned device, and the power supply module supplies power to the PG motor feedback circuit;

S2. Manually rotate the rotor of the PG motor. When the rotor rotates, the feedback circuit of the PG motor intermittently outputs voltage, which is displayed through the display module, and judges whether the feedback circuit of the PG motor is normal according to the display results.

In some embodiments of the present invention, in step S1, the terminals used in the PG motor feedback circuit are matched with the terminals of the device, and the voltage and current sent to the PG motor feedback circuit by the power supply module and the PG electrode feedback circuit are sent to the terminal using the terminals. The circuit of the rotational speed signal of the display module is centrally controlled.

In some embodiments of the present invention, in step S1, the voltage of the dry battery is processed by the three-terminal voltage stabilizing block, and the working voltage required by the feedback circuit of the PG motor is output.

In some embodiments of the present invention, in step S2, an LED is used to display the rotational speed signal sent by the PG electrode feedback circuit, the LED is connected between the signal line and the ground wire of the PG electrode feedback circuit, and the voltage is applied to the LED, if If the LED is lit intermittently, it indicates that the PG motor feedback circuit is working normally and not damaged.

Description of drawings

Fig. 1 shows a schematic structural diagram of a test device in an embodiment of the present invention.

Fig. 2 shows a step chart of the testing method in the embodiment of the present invention.

Explanation of reference signs:

1-power supply; 2-three-terminal voltage regulator block; 3-terminal; 31-voltage positive pole; 32-voltage negative pole; 33-signal terminal; 4-LED; 5-current limiting resistor.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

In an embodiment of the present invention, a test device for a PG motor feedback circuit is provided, as shown in FIG.

The dry battery 1 and the three-terminal voltage stabilizing block 2 are combined to form a power module, which is used to provide the voltage required by the feedback circuit of the PG motor. The voltage of the dry battery 1 passes through the three-terminal voltage regulator block 2 and then outputs a stable voltage, that is, for different PG motor feedback circuits, the required working voltage is different. After the voltage of the dry battery 1 is processed by the three-terminal voltage regulator block 2, it will output PG The working voltage required by the motor feedback circuit avoids the need to provide different power supplies for adaptation to different PG motor feedback circuits, and improves the universality of use of the test device.

The three-terminal voltage stabilizing block 2 has three ports, namely a Vin port, a Vout port and a GND port. The positive pole of the dry battery 1 is connected to the Vin port, and the negative pole of the dry battery 1 is connected to the GND port. In this way, the voltage of the dry battery 1 is between the Vin port and the GND port, and the dry battery 1 passes through the three-terminal voltage regulator block 2 between the Vout port and the GND port. Stabilized voltage after regulation. The output voltage of the three-terminal voltage stabilizing block 2 matches the voltage required by the PG motor feedback circuit. For example, if the working voltage of the PG motor feedback circuit is 5V, the three-terminal voltage stabilizing block 7805 should be selected; if the working voltage of the PG motor feedback circuit is 9V, it should be Choose the three-terminal regulator block 7809.

Terminal 3 and the connecting wires used to connect with the PG motor to be tested are used as connection modules. Terminal 3 is used together with the terminal used in the PG motor feedback circuit. Terminal 3 transmits the voltage and current output by the power supply module to the PG motor feedback circuit and the rotational speed signal sent by the PG electrode feedback circuit to the display module through multiple pins included.

LED4 and current limiting resistor 5 are combined to form a display module, which is used to receive and display the rotational speed signal sent by the PG electrode feedback circuit. Specifically, terminal 3 is a three-core terminal, including a voltage positive pole 31, a voltage negative pole 32, and a signal terminal 33, corresponding to the power input end, power output end, and signal output end of the PG motor feedback circuit respectively. The voltage positive pole 31 is connected to the Vout port of the three-terminal voltage stabilizing block 2, the voltage negative pole 32 is connected to the GND port of the three-terminal voltage stabilizing block 2, the signal terminal 33 is connected to the LED4, the LED4 is connected in series with the current limiting resistor 5, and the current limiting resistor 5 is connected to the Connect to the GND port of the three-terminal regulator block 2. Certainly, the positions of LED4 and the current limiting resistor 5 can also be interchanged, that is, the signal terminal 33 is connected to the current limiting resistor 5 , LED4 is connected in series with the current limiting resistor 5 , and LED4 is connected to the GND port of the three-terminal voltage stabilizing block 2 . The voltage output between the Vout port and the GND port is used as the working voltage of the PG motor feedback circuit.

The PG motor feedback circuit has three wires, which are a power wire, a ground wire, and a signal wire for the output level of the PG motor feedback circuit. The power wire, ground wire, and signal wire are respectively connected to the power wire interface of one terminal. , ground wire interface and signal wire interface. Terminal 3 is used together with the terminals used in the PG motor feedback circuit, and the wiring sequence corresponds to the terminal pins used in the PG motor feedback circuit. One of the terminal 3 and the terminals used in the PG motor feedback circuit is a male terminal, and the other is a female terminal. The male terminal has a pin, and the female terminal has a jack, and the pin is inserted into the jack to realize the connection of the circuit.

When working, the current flows from the positive pole of the output voltage of the three-terminal voltage stabilizing block 2 through the power line interface of the two terminals, flows into the power line of the PG motor feedback circuit, and flows from the ground wire of the PG motor feedback circuit through the ground wire interface of the two terminals. Back to the negative pole of the output voltage of the three-terminal voltage stabilizing block 2, when the PG motor feedback circuit has a signal output, the current flows from the PG motor feedback circuit through the signal line interface of the two terminals into LED4 and the current limiting resistor 5, and then passes through LED4 and the current limiting resistor 5 and then flows back to the negative pole of the output voltage of the three-terminal voltage stabilizing block 2. Through terminal 3, the power input terminal of the PG motor feedback circuit is connected to the Vout port, the power output terminal is connected to the GND port, and the signal output terminal is connected to the LED4 to provide the required voltage for the PG motor feedback circuit. At the same time, the LED4 is periodically activated. Lights up to display the level signal output by the PG motor feedback circuit. It should be noted that the direction of the voltage and current includes two loops, one is the ground wire interface of the terminal to the output voltage negative pole of the three-terminal voltage stabilizing block 2, and the other is the signal line interface of the terminal flowing back to the third circuit after passing through the LED4 and the current limiting resistor 5. The negative pole of the output voltage of the voltage stabilizing block 2 at the end, the two loops do not interfere with each other.

The use of terminal 3 can prevent wrong wire insertion. Of course, terminal 3 is not required to be used. If terminal 3 is not used, the power line is connected to the positive output voltage (Vout port) of the three-terminal voltage stabilizing block 2, and the ground wire is connected to On the output voltage negative pole (GND port) of the three-terminal voltage stabilizing block 2, the signal line of the output level of the PG motor feedback circuit is connected to the circuit connected in series with LED4 and the current limiting resistor 5, and then connected to the output voltage negative pole of the three-terminal voltage stabilizing block 2 (GND port). In contrast, it is necessary to set three terminals to be connected to the power line interface, the ground line interface and the signal line interface of the terminals used in the PG motor feedback circuit respectively, which increases the number of insertion times and makes the process cumbersome.

As a specific implementation, the voltage of the dry battery 1 is greater than the working voltage of the PG motor feedback circuit, and at the same time does not exceed the limit input voltage of the three-terminal voltage stabilizing block 2 .

LED4 is preferably but not limited to use a model with a voltage drop value less than 5V and an operating current less than 20mA, which is used to display the level signal output by the signal line of the PG motor feedback circuit.

The current limiting resistor 5 is used to limit the current of the LED4 to prevent the LED4 from being burned by a large current. Suppose the output level of the signal output end of the PG motor feedback circuit is U1, the voltage drop value of LED4 is U2, the operating current of LED4 is I, and the resistance of current-limiting resistor 5 is R, then R=(U1-U2)/I ; Its power must be greater than (I*U2). If the resistance value of the current limiting resistor is too small or not, LED4 will be burned by the voltage and current output by the PG motor feedback circuit. If the resistance value of the resistor is too large, the LED will not light up. The resistance defined by the above formula is to allow LED4 to work normally for a long time .

It should be noted that the three-terminal voltage stabilizing block 2 is not required. When the three-terminal voltage stabilizing block 2 is not used, the voltage of the dry battery 1 must be equal to the working voltage of the PG motor feedback circuit. Since the voltage of the dry battery 1 is fixed, This makes the test device only applicable to the PG motor feedback circuit whose working voltage is the voltage value of the dry battery 1 .

When the three-terminal voltage stabilizing block 2 is not used, the voltage positive pole 31 of the terminal 3 is connected to the positive pole of the dry battery 1, the voltage negative pole 32 of the terminal 3 is connected to the negative pole of the dry battery 1, the signal terminal 33 of the terminal 3 is connected to the LED4, and the LED4 is connected to the current limiting The resistor 5 is connected in series, and the current-limiting resistor 5 is connected to the negative pole of the dry battery 1 . Of course, the positions of LED4 and current-limiting resistor 5 can also be interchanged, that is, the signal terminal 33 is connected to the current-limiting resistor 5 , LED4 is connected in series with the current-limiting resistor 5 , and LED4 is connected to the negative pole of the dry battery 1 . The voltage output by the dry battery 1 is used as the working voltage of the feedback circuit of the PG motor.

When the three-terminal voltage regulator block 2 and terminal 3 are not used, the power line of the PG motor feedback circuit is connected to the positive pole of the dry battery 1, the ground wire of the PG motor feedback circuit is connected to the negative pole of the dry battery 1, and the output level of the PG motor feedback circuit is The signal line is connected to the circuit in series with LED4 and current limiting resistor 5 and then connected to the negative pole of dry battery 1.

Compared with the prior art, the test device of the present invention cancels all unnecessary components for testing the PG motor feedback circuit, reduces the cost, and is convenient to carry; at the same time, the present invention also solves the problem that the current equipment is not easy to carry and expensive, and The function is far greater than the need to form a waste problem. In addition, the use of dry batteries as a power source avoids electrical safety hazards caused by the use of high voltage.

In an embodiment of the present invention, a method for testing the PG motor feedback circuit is also provided, as shown in FIG. 2, including the following steps:

S1. Connect the terminal of the PG motor feedback circuit to the terminal 3 of the above test device, manually rotate the PG motor rotor, and the power supply module supplies power to the PG motor feedback circuit;

S2. When the rotor rotates, the PG motor feedback circuit intermittently outputs voltage through the signal line. LED4 and the current limiting resistor 5 are connected between the signal line and the ground wire. The voltage is applied to the LED4 and the current limiting resistor 5, and the LED4 is turned on when it is powered on. , goes off when the power is off; if LED4 is lit periodically, it shows that the PG motor feedback circuit is working normally and is not damaged; otherwise, the PG motor feedback circuit is working abnormally.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so the protection scope of the present invention should be based on the scope defined in the claims.

Claims (9)

1. A device for testing a PG motor feedback circuit, characterized in that it comprises: The power module is used to provide the working voltage required by the PG motor feedback circuit; A connection module, which includes a connection wire for being connected to the PG motor to be tested; The display module is used to receive and display the rotational speed signal sent by the PG motor feedback circuit. 2. The device according to claim 1, wherein the connection module further comprises: Terminal (3), it is used in conjunction with the terminal used in described PG motor feedback circuit; Wherein, The terminal (3) respectively transmits the voltage and current output by the power supply module to the PG motor feedback circuit and the rotational speed signal sent to the display module by the PG electrode feedback circuit through a plurality of pins included. 3. The device according to claim 2, wherein the power module comprises: Dry battery (1); A three-terminal voltage stabilizing block (2), used for stabilizing the voltage of the dry battery (1), so that the output voltage of the power module matches the working voltage required by the feedback circuit of the PG motor. 4. The device of claim 3, wherein: The Vin port of the three-terminal voltage stabilizing block (2) is connected to the positive pole of the dry battery (1); The GND port of the three-terminal voltage stabilizing block (2) is connected to the negative pole of the dry battery (1) and the voltage negative pole (32) of the terminal (3), and the GND port is also connected to the display module and then connected to the The signal terminal (33) of the terminal (3); The Vout port of the three-terminal voltage stabilizing block (2) is connected to the voltage anode (31) of the terminal (3). 5. The device according to claim 1, characterized in that the display module comprises LEDs (4). 6. A method for testing a PG motor feedback circuit, comprising the following steps: S1. Connect the PG motor feedback circuit to the corresponding position of the device according to claim 1, and the power supply module supplies power to the PG motor feedback circuit; S2. Manually rotate the rotor of the PG motor. When the rotor rotates, the feedback circuit of the PG motor intermittently outputs voltage, which is displayed by the display module, and judges whether the feedback circuit of the PG motor is normal according to the display result. 7. The method according to claim 6, characterized in that, in step S1, the terminal used in the PG motor feedback circuit is matched with the terminal (3) of the device, and the terminal is used to send the power module to the The voltage and current of the PG motor feedback circuit and the rotation speed signal sent by the PG electrode feedback circuit to the display module are controlled centrally. 8. The method according to claim 6 or 7, characterized in that, in step S1, the voltage of the dry battery (1) is processed by using the three-terminal voltage stabilizing block (2), and the voltage required by the PG motor feedback circuit is output. working voltage. 9. The method according to claim 6, characterized in that, in step S2, the rotational speed signal sent by the PG electrode feedback circuit is displayed using an LED (4), and the LED (4) is connected to the PG electrode feedback circuit. A voltage is applied to the LED (4) between the signal wire and the ground wire of the circuit, and if the LED (4) is lit intermittently, it shows that the PG motor feedback circuit is working normally and is not damaged.