Excitation motor control device and excitation motor

Abstract

The utility model provides an excitation motor control device and an excitation motor, the excitation motor control device is provided with a first excitation winding and a second excitation winding which are connected in series, the supply reliability of excitation current is guaranteed, and a half-bridge circuit is formed by combining a first rectification circuit, a second rectification circuit, a first transistor and a second transistor. Reverse connection of the first excitation winding and the second excitation winding with the rotor winding is realized, output of the excitation motor is monitored according to the voltage sampling circuit, and reverse control of excitation current accessed to the rotor winding is controlled in combination with the half-bridge controller. According to the excitation motor control device and the excitation motor provided by the utility model, when the output voltage of the excitation motor rises due to the influence of a capacitive load, the excitation current can be reversely regulated and controlled, and the rapid reversing of an excitation magnetic field is realized, so that the output voltage of the excitation motor is rapidly reduced, the voltage stabilization control is realized, and the realization is simple and effective; the adaptive capacity of the excitation motor to a capacitive load can be effectively improved, and the performance of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to an excitation motor control device and an excitation motor. Background Art

[0002] With the development of modern weapons and equipment, capacitive loads account for an increasing proportion. When a generator is loaded with a capacitive load, two situations usually occur: direct-axis magnetization and quadrature-axis armature reaction. DC magnetization will cause the generator voltage to increase, and voltage instability will cause the generator set to shut down; and quadrature-axis armature reaction will increase the generator radiation heat due to the influence of harmonics, increase the generator temperature, damage the generator insulation, reduce the generator load capacity, and may trigger reverse reactive power protection shutdown.

[0003] In order to suppress the voltage increase caused by capacitive load, currently only a larger capacity generator can be selected according to the size of the capacitive load, so that the capacitive load capacity is much smaller than the generator capacity. However, larger capacity generators are large in size, high in cost, and lack practicality, and are not suitable for field mobile operations. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide an excitation motor control device and an excitation motor to solve the problem that the existing generator has poor adaptability to capacitive loads and is not suitable for field mobile operations.

[0005] The utility model provides an excitation motor control device on one hand, which comprises: a first excitation winding and a second excitation winding connected to an excitation power supply, wherein:

[0006] The first excitation winding is connected to an input end of a first rectifier circuit, a positive end of the first rectifier circuit is connected to a first end of a rotor winding of the excitation motor through a first transistor, and a negative end of the first rectifier circuit is connected to a second end of the rotor winding;

[0007] The second excitation winding is connected to an input end of a second rectifier circuit, a positive end of the second rectifier circuit is connected to a second end of the rotor winding, and a negative end of the second rectifier circuit is connected to a first end of the rotor winding via a second transistor;

[0008] The gates of the first transistor and the second transistor are respectively connected to the high output terminal and the low output terminal of the half-bridge controller, the control terminal of the half-bridge controller is connected to the output terminal of the voltage sampling circuit, and the sampling terminal of the voltage sampling circuit is connected to the output terminal of the excitation motor.

[0009] Optionally, the voltage sampling circuit includes a Hall sensor arranged at the output end of the excitation motor, a third resistor and a fourth resistor connected in sequence between the output end of the Hall sensor and the ground, and a comparator, wherein the first input end of the comparator is connected to the intermediate node between the third resistor and the fourth resistor, the second input end is connected to a reference signal, and the output end is connected to the control end of the half-bridge controller.

[0010] Optionally, the voltage sampling circuit further includes a second capacitor, one end of the second capacitor is connected to the middle node between the third resistor and the fourth resistor, and the other end of the second capacitor is grounded.

[0011] Optionally, the voltage sampling circuit further includes an amplifier, and the amplifier is connected between an intermediate node between the third resistor and the fourth resistor and the first input terminal of the comparator.

[0012] Optionally, the excitation power supply is a three-phase power supply, the first excitation winding and the second excitation winding are three-phase windings, and the first rectifier circuit and the second rectifier circuit are three-phase rectifier circuits.

[0013] Optionally, the half-bridge controller includes a half-bridge control chip, and an enable terminal of the half-bridge control chip is connected to a power supply terminal, and a common ground terminal is connected to a negative terminal of the second rectifier circuit.

[0014] Another aspect of the utility model provides an excitation motor, which comprises the excitation motor control device mentioned above.

[0015] The excitation motor control device provided by the utility model comprises: a first excitation winding and a second excitation winding connected to an excitation power supply, wherein the first excitation winding is connected to the input end of a first rectifier circuit, the positive end of the first rectifier circuit is connected to the first end of a rotor winding of an excitation motor through a first transistor, and the negative end of the first rectifier circuit is connected to the second end of the rotor winding; the second excitation winding is connected to the input end of a second rectifier circuit, the positive end of the second rectifier circuit is connected to the second end of the rotor winding, and the negative end of the second rectifier circuit is connected to the first end of the rotor winding through a second transistor; the gates of the first transistor and the second transistor are respectively connected to the high-order output end and the low-order output end of a half-bridge controller, the control end of the half-bridge controller is connected to the output end of a voltage sampling circuit, and the sampling end of the voltage sampling circuit is connected to the output end of the excitation motor. When the output voltage of the excitation motor exceeds a normal value due to the influence of a capacitive load, the voltage sampling circuit is fed back to the control end of the half-bridge controller, and the conduction state of the first transistor and the second transistor can be switched, so that the current of the rotor winding is reversed, the direction of the excitation magnetic field is changed, and the output voltage of the excitation motor is quickly reduced, thereby avoiding the overvoltage problem. The excitation motor control device of the utility model can realize the adaptation of the excitation motor to the capacitive load without increasing the motor capacity, thereby effectively improving the practicability of the excitation motor.

[0016] The excitation motor provided by the utility model comprises the above-mentioned excitation motor control device, which can realize the adaptation of the excitation motor to the capacitive load without increasing the motor capacity, thereby effectively improving the practicability of the excitation motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the circuit structure of the excitation motor control device in the embodiment of the utility model.

[0018] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0022] In order to solve the problems of high cost and insufficient practicality in dealing with capacitive loads in the prior art, the utility model provides an excitation motor control device, which can commutate the excitation magnetic field when the output voltage of the excitation motor increases due to the influence of the capacitive load, thereby quickly reducing the output voltage of the excitation motor and realizing voltage stabilization control.

[0023] For details, please refer to Figure 1 , which includes a first excitation winding L1 and a second excitation winding L2 connected to an excitation power supply, wherein the first excitation winding L1 is connected to an input end of a first rectifier circuit, a positive end of the first rectifier circuit is connected to a first end of a rotor winding LF of the excitation motor through a first transistor M1, and a negative end of the first rectifier circuit is connected to a second end of the rotor winding LF, and when only the first transistor M1 is turned on, forward excitation is provided.

[0024] The second excitation winding L2 is connected to the input end of the second rectifier circuit, the positive end of the second rectifier circuit is connected to the second end of the rotor winding LF, and the negative end of the second rectifier circuit is connected to the first end of the rotor winding LF through the second transistor M2. When only the second transistor M2 is turned on, reverse excitation is provided.

[0025] The gates of the first transistor M1 and the second transistor M2 are respectively connected to the high output terminal and the low output terminal of the half-bridge controller, the control terminal of the half-bridge controller is connected to the output terminal of the voltage sampling circuit, and the sampling terminal of the voltage sampling circuit is connected to the output terminal of the excitation motor 01.

[0026] When load 02 is a capacitive load, when the excitation motor 01 starts, the output electric energy will charge the capacitive load, the output current increases, and direct-axis magnetization occurs, so that the output voltage is higher than the stable value. At this time, according to the output of the voltage sampling circuit, the output state of the half-bridge controller is flipped, the first transistor M1 is turned off, the second transistor M2 is turned on, and the excitation current of the rotor winding LF is reversed, so that the output voltage of the excitation motor is reduced until it is reduced to a stable value. At this time, according to the output of the voltage sampling circuit, the output state of the half-bridge controller is flipped again, the first transistor M1 is turned on, the second transistor M2 is turned off, the excitation current of the rotor winding LF is restored to the positive direction, and the excitation motor outputs normally.

[0027] The excitation motor control device of the utility model is provided with a first excitation winding and a second excitation winding connected in series to ensure the reliability of the supply of the excitation current, and a half-bridge circuit is provided to realize the reverse connection of the first excitation winding and the second excitation winding with the rotor winding. The output of the excitation motor is monitored according to the voltage sampling circuit, and the reverse control of the excitation current connected to the rotor winding is controlled in combination with the half-bridge controller. When the output voltage of the excitation motor increases due to the influence of the capacitive load, the excitation current can be reversely regulated to realize the rapid commutation of the excitation magnetic field, thereby quickly reducing the output voltage of the excitation motor and realizing voltage stabilization control.

[0028] To ensure the normal output of the excitation motor, in this embodiment, the voltage sampling circuit includes a Hall sensor H1 arranged at the output end of the excitation motor 01, a third resistor R3 and a fourth resistor R4 connected in sequence between the output end of the Hall sensor H1 and the ground, and a comparator A1. The first input end of the comparator A1 is connected to the middle node between the third resistor R3 and the fourth resistor R4, the second input end is connected to the reference signal V2, and the output end is connected to the control end of the half-bridge controller.

[0029] The sampling signal obtained by the Hall sensor H1 is divided by the third resistor R3 and the fourth resistor R4 to obtain the reference signal V1. The sampling signal V1 is transmitted to the comparator A1 and compared with the reference signal V2. The comparison result is used as the control signal of the half-bridge controller. The Hall sensor has good transient response capability and can effectively detect the transient increase of the output voltage of the excitation motor to ensure the reliability of voltage stabilization control.

[0030] In order to improve the reliability of control, in the present embodiment, the voltage sampling circuit further includes a second capacitor C2, one end of which is connected to the middle node of the third resistor R3 and the fourth resistor R4, and the other end is grounded. The third resistor R3 can be used to form an RC filter circuit to filter out extremely high fluctuations in the sampling signal. When a step pulse interference occurs in the output voltage of the excitation motor 01, the pulse interference signal can be ignored because it cannot cause any safety impact on the excitation motor 01. However, the interference can trigger the control device of the present invention to flip. Therefore, an RC filter circuit is provided to filter out the interference pulse signal, which can improve the reliability of control. In the reverse operation of the excitation, the reliability of control can also be guaranteed, and the reliability of the voltage stabilization control of the excitation motor can be guaranteed.

[0031] In an optional embodiment, the voltage sampling circuit also includes an amplifier, which is connected between the middle node of the third resistor R3 and the fourth resistor R4 and the first input terminal of the comparator A1. The amplifier can increase the width of the sampling signal, improve the accuracy of subsequent comparisons, and thereby improve the accuracy of voltage regulation control.

[0032] To improve the excitation stability, in this embodiment, the excitation power supply is a three-phase power supply, the first excitation winding L1 and the second excitation winding L2 are three-phase windings of the three-phase power supply, and correspondingly, the first rectifier circuit and the second rectifier circuit are three-phase rectifier circuits, which can provide a stable DC excitation current to the rotor winding LF. Since the excitation power supply is not affected by the output state of the excitation motor 01, the engine of the excitation motor 01 can be used to drive a three-phase generator to provide a three-phase power supply.

[0033] In this embodiment, the half-bridge controller includes a half-bridge control chip U1, and the enable terminal SD of the half-bridge control chip U1 is connected to the power supply terminal VCC, and the common ground terminal COM is connected to the negative terminal of the second rectifier circuit. When the power supply terminal VCC of the half-bridge control chip U1 is connected to the power supply, its enable terminal SD is synchronously connected to the level, and the half-bridge control chip U1 is controlled to enter the working state, and the output voltage of the high output terminal HO and the low output terminal LO is controlled according to the input terminal IN, thereby controlling the switching state of the first transistor M1 and the second transistor M2. A first diode D1 is connected between the high-side floating power supply pin VB of the half-bridge control chip U1 and the power supply terminal VCC, the high-side floating power supply feedback pin VS is connected to the first end of the rotor winding LF, and a first capacitor C1 is connected between the high-side floating power supply pin VB and the high-side floating power supply feedback pin VS. The half-bridge control chip U1 is specifically, for example, an IR2104 type half-bridge control chip, and the first transistor M1 and the second transistor M2 are high-voltage conduction transistors.

[0034] The utility model also provides an excitation motor, which includes the above-mentioned excitation motor control device, which can control the excitation reverse direction of the rotor winding when the output voltage of the excitation motor is higher than the preset voltage regulation value, and quickly reduce the output voltage of the excitation motor to the voltage regulation value to achieve voltage regulation control. The forward and reverse excitation currents are realized by the first excitation winding and the second excitation winding connected in series in combination with a half-bridge circuit, so that the structure is simple and effective, and the adaptability of the excitation motor to capacitive loads is improved.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A field motor control device, characterized in that: include: A first excitation winding and a second excitation winding connected to an excitation power supply, wherein: The first excitation winding is connected to an input end of a first rectifier circuit, a positive end of the first rectifier circuit is connected to a first end of a rotor winding of the excitation motor through a first transistor, and a negative end of the first rectifier circuit is connected to a second end of the rotor winding; The second excitation winding is connected to an input end of a second rectifier circuit, a positive end of the second rectifier circuit is connected to a second end of the rotor winding, and a negative end of the second rectifier circuit is connected to a first end of the rotor winding via a second transistor; The gates of the first transistor and the second transistor are respectively connected to the high output terminal and the low output terminal of the half-bridge controller, the control terminal of the half-bridge controller is connected to the output terminal of the voltage sampling circuit, and the sampling terminal of the voltage sampling circuit is connected to the output terminal of the excitation motor.

2. The excitation motor control device according to claim 1, characterized in that: The voltage sampling circuit includes a Hall sensor arranged at the output end of the excitation motor, a third resistor and a fourth resistor connected in sequence between the output end of the Hall sensor and the ground, and a comparator, wherein the first input end of the comparator is connected to the middle node between the third resistor and the fourth resistor, the second input end is connected to a reference signal, and the output end is connected to the control end of the half-bridge controller.

3. The excitation motor control device according to claim 2, characterized in that: The voltage sampling circuit further includes a second capacitor, one end of which is connected to a middle node between the third resistor and the fourth resistor, and the other end of which is grounded.

4. The excitation motor control device according to claim 2, characterized in that: The voltage sampling circuit further includes an amplifier connected between an intermediate node between the third resistor and the fourth resistor and a first input terminal of the comparator.

5. The excitation motor control device according to claim 1, characterized in that: The excitation power supply is a three-phase power supply, the first excitation winding and the second excitation winding are three-phase windings, and the first rectifier circuit and the second rectifier circuit are three-phase rectifier circuits.

6. The excitation motor control device according to claim 1, characterized in that: The half-bridge controller includes a half-bridge control chip, and an enable terminal of the half-bridge control chip is connected to a power supply terminal, and a common ground terminal is connected to a negative terminal of the second rectifier circuit.

7. An excitation motor, characterized in that: It comprises the excitation motor control device as described in any one of claims 1 to 6.

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