Fast low-power-consumption starting circuit of permanent magnet alternating current synchronous motor

By using a fast, low-power start-up circuit for a permanent magnet AC synchronous motor and a microcontroller to control the conduction angle of the thyristor, the problems of high power consumption and significant noise during the start-up of AC drainage pumps are solved, achieving fast, low-power start-up of the motor and simplifying the design.

CN223809711UActive Publication Date: 2026-01-16ANHUI RUIDE INTELLIGENT TECH CO LTD
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Patent Information

Application Number
CN202520341553.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-28
Publication Date
2026-01-16
Estimated Expiration
2035-02-28

AI Technical Summary

Technical Problem

Existing AC drainage pump starting methods suffer from high power consumption, significant noise, and high complexity.

Method used

A fast, low-power start-up circuit for permanent magnet AC synchronous motors is adopted. The circuit consists of a processing chip U1, resistors, capacitors, diodes, etc. The motor power is controlled by a microcontroller controlling the conduction angle of the thyristor, which simplifies the control method and reduces start-up power consumption.

Benefits of technology

It enables rapid, low-power motor startup, reduces energy consumption and noise during startup, simplifies product design, and improves motor adaptability and control reliability.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a rapid low-power-consumption starting circuit of a permanent magnet AC synchronous motor. The rapid low-power-consumption starting circuit comprises a processing chip U1, first to twentieth resistors R1 to R20, first to third diodes D1 to D3, first to sixth capacitors C1 to C6, a first electrolytic capacitor EC1, a thermal protection module F1, an AC motor coil, a first voltage stabilizing diode ZD1 and a rectifier diode G, the control mode is simple, single-chip microcomputer power supply adopts a non-isolation resistance-capacitance voltage reduction scheme, and a motor control part adopts a single-chip microcomputer to control a conduction angle of a silicon controlled rectifier to realize motor power control. The circuit is simple, low in cost, safe and reliable, and the working state of the motor is known in real time through the simplest detection mode so as to be controlled. The scheme is very high in adaptability, can be matched with a motor with a starting coil, is also compatible with a unipolar motor which is lower in cost and is not provided with a starting coil, and is high in control scheme compatibility.
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Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially relates to a permanent magnet AC synchronous motor quick low -power consumption starting circuit. BACKGROUND

[0002] Now the washing machine drainage pump is mostly AC drainage pump, mainly by stator coil, silicon steel sheet, starting coil, permanent magnet rotor, fan blade and shell and starting chamber constitute. The stator coil is nested on the silicon steel sheet, the starting coil is nested on the stator coil, the motor is started through the starting coil after being electrified, and the starting coil is closed and disconnected after reaching a certain rotating speed, is driven by the stator coil, and the rotor rotates.

[0003] The AC drainage pump used in the market realizes the starting of the drainage pump through starting capacitor or starting coil, and cooperates with the starting chamber and the starting coil, this starting mode has the problems of large starting power consumption, obvious noise declaration and the like, and the starting chamber and the starting coil increase the complexity of product design. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a permanent magnet AC synchronous motor quick low -power consumption starting circuit, and solves the problems of large starting power consumption, obvious noise declaration and the like in the starting mode in the prior art, and the starting chamber and the starting coil increase the complexity of product design.

[0005] The application discloses a quick low-power starting circuit of a permanent magnet alternating current synchronous motor, which comprises a processing chip U1, first to twentieth resistors R1 to R20, first to third diodes D1 to D3, first to sixth capacitors C1 to C6, a first electrolytic capacitor EC1, a thermal protection module F1, an alternating current motor coil, a first voltage stabilizing diode ZD1 and a rectifier diode G; one end of the first resistor R1 is connected with external zero voltage, the other end is connected with one end of the second resistor R2, the other end of the second resistor R2 is connected with the input end of the first capacitor D1, and the output end of the first capacitor D1 is connected with external high voltage; the output end of the second capacitor D2 and one end of the third resistor R3 are both connected with the input end of the first capacitor D1, the input end of the second capacitor D2 is connected with the ground, the other end of the third resistor R3 is connected with the P1.0 port of the processing chip U1, one end of the first capacitor C1 is connected with the P1.0 port of the processing chip U1, and the other end is connected with the ground; one end of the sixth capacitor C6 is connected with external high voltage and the VDD port of the processing chip U1, and the other end is connected with the ground and the VSS port of the processing chip U1; one end of the tenth resistor R10 is connected with external Coil end, the other end is connected with one end of the eighth resistor R8, the other end of the eighth resistor R8 is connected with the P2.5 port of the processing chip U1, one end of the second capacitor C2 and one end of the fourth resistor R4 are both connected with the P2.5 port of the processing chip U1, and the other ends are both connected with the ground; one end of the seventh resistor R7 and one end of the third capacitor C3 are both connected with the P2.4 port of the processing chip U1, and the other ends are both connected with the ground; one end of the fifth resistor R5 is connected with external high voltage, and the other end is connected with the P2.5 port of the processing chip U1; one end of the sixth resistor R6 is connected with external high voltage, and the other end is connected with the P2.4 port of the processing chip U1; one end of the eleventh resistor R11 is connected with external zero voltage, the other end is connected with one end of the ninth resistor R9, and the other end of the ninth resistor R9 is connected with the P2.4 port; one end of the rectifier diode G is connected with external high voltage, the other end is connected with one end of the AC motor coil, the other end of the AC motor coil is connected with external zero voltage, the thermal protection module F1 is connected between the AC motor coil and external zero voltage; one end of the twelfth resistor R12 is connected with external high voltage, the other end is connected with one end of the fourth capacitor C4, the other end of the fourth capacitor is connected with one end of the AC motor coil; one end of the thirteenth resistor R13 is connected with external high voltage, the other end is connected with low external level on circuit; the first voltage stabilizing diode ZD1, the fourteenth resistor R14, the fifth capacitor C5, the first electrolytic capacitor EC1 are connected in parallel, one end of which is connected with external high voltage, the other end is connected with ground; one end of the fifteenth resistor R15, the sixteenth resistor R16 and the seventeenth resistor R17 is connected with ground, the other end of which is connected with one end of the eighteenth resistor R18, the nineteenth resistor R19 and the twentieth resistor R20; the other end of the eighteenth resistor R18, the nineteenth resistor R19 and the twentieth resistor R20 is connected with the input end of the third diode D3, the output end of the third diode D3 is connected with external zero voltage.

[0006] The permanent magnet AC synchronous motor quick low-power starting circuit has the following advantages:

[0007] The control mode is simple, the single-chip microcomputer power supply adopts a non-isolated resistance-capacitance voltage reduction scheme, and the motor control part adopts a single-chip microcomputer to control the conduction angle of a silicon-controlled rectifier to realize motor power control. The circuit is simple, low in cost, safe and reliable, and the working state of the motor can be understood in real time through the simplest detection mode to control. The adaptability of the scheme is very strong, and it can not only match the motor with a starting coil, but also be compatible with the single-polarity motor without a starting coil, which is low in cost. The control scheme has strong compatibility. BRIEF DESCRIPTION OF DRAWINGS

[0008] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation on the present application. In the drawings:

[0009] Figure 1 A circuit structure schematic diagram of the permanent magnet AC synchronous motor quick low-power starting circuit in the present application is shown.

[0010] Figure 2 A detection signal diagram of the permanent magnet AC synchronous motor quick low-power starting circuit in the present application is shown. DETAILED DESCRIPTION

[0011] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0012] As shown in Figure 1 and Figure 2 shown, Figure 1 The circuit structure schematic diagram of the quick low-power-consumption starting circuit of the permanent magnet alternating current synchronous motor in the present application is shown. Figure 2 The detection signal diagram of the quick low-power-consumption starting circuit of the permanent magnet alternating current synchronous motor in the present application is shown. Figure 2In the middle, CH1 is zero-crossing signal, CH2 is mains voltage signal, CH3 is motor back electromotive force CH4 is motor current signal. The utility model provides a kind of permanent magnet ac synchronous motor fast low-power consumption starting circuit, including processing chip U1, first to twentieth resistance R1~R20, first to third diode D1~D3, first to sixth capacitor C1~C6, first electrolytic capacitor EC1, thermal protection module F1, ac motor coil, first zener diode ZD1 and rectifier diode G;Wherein, the single-chip microcomputer 1st foot and 2 feet of processing chip U1 are connected as power supply end, and power supply comes from half-wave rectification circuit part;3rd foot is mains zero-crossing detection, and single-chip microcomputer controls the conduction angle of silicon-controlled rectifier by this signal as one of basis;The silicon-controlled rectifier conduction control foot of single-chip microcomputer 7th foot time;Single-chip microcomputer 9th foot detects current conduction time;Single-chip microcomputer 10th foot detects mains voltage.One end of the first resistor R1 is connected to external zero voltage, the other end is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to the input end of the first capacitor D1, the output end of the first capacitor D1 is connected to external high voltage; the output end of the second capacitor D2 and one end of the third resistor R3 are both connected to the input end of the first capacitor D1, the input end of the second capacitor D2 is connected to ground, the other end of the third resistor R3 is connected to the P1.0 port of the processing chip U1, one end of the first capacitor C1 is connected to the P1.0 port of the processing chip U1, the other end is connected to ground; one end of the sixth capacitor C6 is connected to external high voltage and the VDD port of the processing chip U1, the other end is connected to ground and the VSS port of the processing chip U1; one end of the tenth resistor R10 is connected to external Coil end, the other end is connected to one end of the eighth resistor R8, the other end of the eighth resistor R8 is connected to the P2.5 port of the processing chip U1, the second capacitor C2 and one end of the fourth resistor R4 are both connected to the P2.5 port of the processing chip U1, the other ends are both connected to ground; the seventh resistor R7 and one end of the third capacitor C3 are both connected to the P2.4 port of the processing chip U1, the other ends are both connected to ground; one end of the fifth resistor R5 is connected to external high voltage, the other end is connected to the P2.5 port of the processing chip U1; one end of the sixth resistor R6 is connected to external high voltage, the other end is connected to the P2.4 port of the processing chip U1; one end of the eleventh resistor R11 is connected to external zero voltage, the other end is connected to one end of the ninth resistor R9, the other end of the ninth resistor R9 is connected to the P2.4 port of the processing chip U1; one end of the rectifier diode G is connected to external high voltage, the other end is connected to one end of the AC motor coil, the other end of the AC motor coil is connected to external zero voltage, the thermal protection module F1 is connected between the AC motor coil and external zero voltage; one end of the twelfth resistor R12 is connected to external high voltage, the other end is connected to one end of the fourth capacitor C4, the other end of the fourth capacitor is connected to one end of the AC motor coil; one end of the thirteenth resistor R13 is connected to external high voltage, the other end is connected to low external level on circuit; the first voltage stabilizing diode ZD1, the fourteenth resistor R14, the fifth capacitor C5, the first electrolytic capacitor EC1 are connected in parallel, one end is connected to external high voltage, the other end is connected to ground; one end of the fifteenth resistor R15, the sixteenth resistor R16 and the seventeenth resistor R17 is connected to ground, the other ends are connected to one end of the eighteenth resistor R18, the nineteenth resistor R19 and the twentieth resistor R20; the other ends of the eighteenth resistor R18, the nineteenth resistor R19 and the twentieth resistor R20 are connected to the input end of the third diode D3, the output end of the third diode D3 is connected to external zero voltage.

[0013] In use, the permanent magnet alternating current motor can be started quickly without external sensors and in the state during auxiliary starting through a control algorithm, power consumption during starting can be controlled, power consumption during starting is reduced, and impact on the whole system is reduced. The single-chip microcomputer power supply adopts a non-isolated resistance-capacitance step-down scheme, and the motor control part adopts a single-chip microcomputer to control the conduction angle of a thyristor to realize motor power control. This scheme has simple circuit, low cost, and is safe and reliable. Before starting, the motor first collects the AC input voltage after resistance division through the ADC pin. The AC voltage AD value is obtained, the real AC voltage is obtained through ratio conversion according to the AC voltage AD value and the frequency of the AC voltage, the conduction angle is calculated according to the algorithm formula, and the conduction angle is opened at which time the power consumption of the starting motor is minimized. The conduction angle is continuously adjusted according to the back electromotive force to achieve the purpose of quick starting. During the starting stage, because the alternating current motor adopts single-pole and has no starting coil, the conduction angle needs to be continuously adjusted according to different voltages to achieve the purpose of starting. In the stable stage, the conduction angle of the thyristor is adjusted according to the mains voltage and the current zero-crossing time after the motor starts, so that the current conduction time is maintained within the calculated time, and whether the conduction angle of the thyristor is within the theoretical calculation range is judged.

[0014] The permanent magnet alternating current synchronous motor quick low-power starting circuit has simple control mode, the single-chip microcomputer power supply adopts a non-isolated resistance-capacitance step-down scheme, and the motor control part adopts a single-chip microcomputer to control the conduction angle of a thyristor to realize motor power control. The circuit is simple, low in cost, safe and reliable, the working state of the motor is understood in real time through the simplest detection mode, and then the motor is controlled. The scheme has strong adaptability, can match the motor with a starting coil, is also compatible with the single-pole motor without a starting coil and low in cost, and has strong control scheme compatibility.

[0015] The above merely describes a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, and all should be covered in the protection scope of the utility model.

Claims

1. A quick low power start circuit for a permanent magnet ac synchronous motor, characterized by, It includes processing chip U1, first to twentieth resistance R1~R20, first to third diode D1~D3, first to sixth capacitor C1~C6, first electrolytic capacitor EC1, thermal protection module F1, AC motor coil, first voltage regulator diode ZD1 and rectifier diode G;The one end of the first resistance R1 is connected to the external zero voltage, the other end is connected to the one end of the second resistance R2, the other end of the second resistance R2 is connected to the input end of the first capacitor D1, and the output end of the first capacitor D1 is connected to the external high voltage;The output end of the second capacitor D2 and the one end of the third resistance R3 are connected to the input end of the first capacitor D1, the input end of the second capacitor D2 is connected to ground, and the other end of the third resistance R3 is connected to the P1.0 port of the processing chip U1;The one end of the first capacitor C1 is connected to the P1.0 port of the processing chip U1, and the other end is connected to ground;The one end of the sixth capacitor C6 is connected to the external high voltage and the VDD port of the processing chip U1, and the other end is connected to ground and the VSS port of the processing chip U1;The one end of the tenth resistance R10 is connected to the external Coil end, and the other end is connected to the one end of the eighth resistance R8, and the other end of the eighth resistance R8 is connected to the P2.5 port of the processing chip U1;The second capacitor C2 and the one end of the fourth resistance R4 are connected to the P2.5 port of the processing chip U1, and the other end is connected to ground;The seventh resistance R7 and the one end of the third capacitor C3 are connected to the P2.4 port of the processing chip U1, and the other end is connected to ground;The one end of the fifth resistance R5 is connected to the external high voltage, and the other end is connected to the P2.5 port of the processing chip U1;The one end of the sixth resistance R6 is connected to the external high voltage, and the other end is connected to the P2.4 port of the processing chip U1;The one end of the eleventh resistance R11 is connected to the external zero voltage, and the other end is connected to the one end of the ninth resistance R9, and the other end of the ninth resistance R9 is connected to the P2.4 Port; one end of the rectifier diode G is connected to external high voltage, the other end is connected to one end of the AC motor coil, the other end of the AC motor coil is connected to external zero voltage, the thermal protection module F1 is connected between the AC motor coil and external zero voltage; one end of the twelfth resistor R12 is connected to external high voltage, the other end is connected to one end of the fourth capacitor C4, the other end of the fourth capacitor is connected to one end of the AC motor coil; one end of the thirteenth resistor R13 is connected to external high voltage, the other end is connected to low external level on circuit; the first voltage stabilizing diode ZD1, the fourteenth resistor R14, the fifth capacitor C5, the first electrolytic capacitor EC1 are connected in parallel, one end is connected to external high voltage, the other end is connected to ground; one end of the fifteenth resistor R15, the sixteenth resistor R16 and the seventeenth resistor R17 is connected to ground, the other end is connected to one end of the eighteenth resistor R18, the nineteenth resistor R19 and the twentieth resistor R20; the other end of the eighteenth resistor R18, the nineteenth resistor R19 and the twentieth resistor R20 is connected to the input end of the third diode D3, the output end of the third diode D3 is connected to external zero voltage.