Boost circuit for detecting motor stator coil insulation resistance
By constructing a simple boost circuit and utilizing components such as isolation transformers, rectifiers, capacitors, and transient suppression diodes, the high cost and complex circuitry of the motor stator coil insulation resistance testing system were solved, achieving stable high-voltage output and accurate testing.
Patent Information
- Application Number
- CN202521043189.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-26
- Publication Date
- 2026-03-06
- Estimated Expiration
- 2035-05-26
AI Technical Summary
Existing motor stator coil insulation resistance testing systems have high hardware costs and complex circuit structures, especially due to the complexity caused by DC high-voltage inverter technology.
A simple boost circuit is constructed using an isolation transformer, rectifier components, capacitors, transient suppression diodes, and short-circuit protection resistors to achieve stable DC high-voltage output and avoid complex DC high-voltage inverter circuits.
Reduce system hardware costs and circuit design complexity, improve the stability and accuracy of the detection process, and enhance system security and anti-interference capabilities.
Smart Images
Figure CN223978582U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the detection of insulation resistance of motor stator windings, and more particularly to a boost circuit for detecting insulation resistance of motor stator windings. Background Technology
[0002] In comprehensive motor testing projects, the insulation resistance test of the motor stator coil is a critical test item. Currently, this test typically requires the use of insulation resistance testing instruments. Existing technologies for testing the insulation resistance of motor stator coils suffer from the following technical drawbacks: First, the test system requires a dedicated DC high-voltage generation circuit. This circuit usually employs AC inverter technology and achieves high-voltage output through a gradual voltage boosting method. This design not only significantly increases the system hardware cost but also complicates the overall circuit structure. Utility Model Content
[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a boost circuit for detecting the insulation resistance of motor stator coils.
[0004] This utility model is achieved through the following technical solution:
[0005] A boost circuit for detecting the insulation resistance of a motor stator coil includes an isolation transformer, a rectifier assembly, a capacitor, a transient voltage suppressor diode, a resistor under test, and a short-circuit protection resistor. The isolation transformer includes an X1 terminal and an X4 terminal. The X1 terminal, the rectifier assembly, the short-circuit protection resistor, the resistor under test, and the X4 terminal are connected in series. The capacitor is connected in parallel with the resistor under test and the short-circuit protection resistor. The transient voltage suppressor diode is connected in parallel with the resistor under test and the short-circuit protection resistor.
[0006] Furthermore, the isolation transformer also includes an input section connected to a 220V AC voltage, which enables a 440V AC voltage to be generated between terminals X1 and X4.
[0007] Furthermore, the isolation transformer also includes a first output section and a second output section. The first output section includes an X1 terminal and an X2 terminal, and the second output section includes an X3 terminal and an X4 terminal. The X2 terminal and the X3 terminal are connected to each other so that the first output section and the second output section are connected in series.
[0008] Furthermore, the rectifier assembly includes diodes D1 and D2 connected in series.
[0009] Furthermore, the transient suppression diode is a DC 500V transient suppression diode.
[0010] The beneficial effects of this utility model are:
[0011] By constructing a simple and efficient boost circuit using components such as isolation transformers, rectifier components, capacitors, transient suppression diodes, and short-circuit protection resistors, a stable DC high-voltage output can be achieved without the need for complex DC high-voltage inverter circuits, effectively reducing system hardware costs and circuit design complexity. In addition, the transient suppression diodes and short-circuit protection resistors in the circuit enhance the system's safety and anti-interference capabilities, helping to improve the stability and accuracy of the insulation resistance detection process. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the boost circuit of this utility model. Detailed Implementation
[0013] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and preferred embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0014] In the description of the utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.
[0015] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0016] This invention provides a boost circuit for detecting the insulation resistance of a motor stator coil. The boost circuit includes an isolation transformer, a rectifier assembly, a capacitor, a transient voltage suppressor diode, a resistor under test, and a short-circuit protection resistor. The isolation transformer includes an input section, a first output section, and a second output section. The input section's terminals L1 and L2 are connected to a 220V AC voltage. The first output section's terminals are X1 and X2, and the second output section's terminals are X3 and X4. X2 and X3 are connected in series, connecting the first and second output sections. The input section enables a 440V AC voltage to be generated between X1 of the first output section and X4 of the second output section. The rectifier assembly includes diodes D1 and D2 for half-wave rectification. The capacitor is C1, the transient voltage suppressor diode is specifically a 500V DC transient voltage suppressor diode D3, the resistor under test is RX, and the short-circuit protection resistor is R1. X1, D1, D2, R1, RX, and X4 are connected in series. One end of C1 is connected between D2 and R1, and the other end is connected between RX and X4. D3 is connected in parallel with C1. Furthermore, a first output terminal Q1 is provided between D2 and R1, and a second output terminal Q2 is provided between RX and X4. A DC voltage of 500V is provided between Q1 and Q2. The voltage and current between Q1 and Q2 are known, and the resistance value of R1 is known. Using the formula R = U / I, the resistance value of the resistor being measured, RX, can be calculated.
[0017] The beneficial effects of this invention are as follows: by constructing a simple and efficient boost circuit using components such as an isolation transformer, rectifier assembly, capacitor, transient suppression diode, and short-circuit protection resistor, a stable DC high-voltage output can be achieved without the need for a complex DC high-voltage inverter circuit, effectively reducing system hardware costs and circuit design complexity. In addition, the transient suppression diode and short-circuit protection resistor in the circuit enhance the system's safety and anti-interference capabilities, and help improve the stability and accuracy of the insulation resistance detection process.
[0018] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A voltage boosting circuit for detecting the resistance of the insulation of a stator winding of an electric machine, characterized in that, The isolation transformer comprises an X1 end and an X4 end, the X1 end, a rectifier assembly, a short-circuit protection resistor, a measured resistor and the X4 end are connected in series, a capacitor is connected in parallel with the measured resistor and the short-circuit protection resistor, and a transient suppression diode is connected in parallel with the measured resistor and the short-circuit protection resistor.
2. The voltage boosting circuit for detecting the insulation resistance of a stator winding of an electric machine according to claim 1, characterized in that, The isolation transformer further comprises an input part connected to 220V AC voltage, which can generate 440V AC voltage between the X1 end and the X4 end.
3. The voltage boosting circuit for detecting the insulation resistance of a stator winding of an electric machine according to claim 2, characterized in that, The isolation transformer further comprises a first output part and a second output part, the first output part comprises an X1 end and an X2 end, the second output part comprises an X3 end and an X4 end, and the X2 end is connected to the X3 end to connect the first output part and the second output part in series.
4. The voltage boosting circuit for detecting the insulation resistance of a stator winding of an electric machine according to claim 1, characterized in that, The rectifier assembly comprises diodes D1 and D2 connected in series.
5. The voltage boosting circuit for detecting the insulation resistance of a stator winding of an electric machine according to claim 1, characterized in that, The transient suppression diode is a DC 500V transient suppression diode.