阅读说明：本技术 一种开关磁阻电机驱动器运行智能控制方法 (switched reluctance motor driver operation intelligent control method ) 是由 赵跃东 刘宇航 牛根艺 张�浩 刘平顺 范红伟 于 2019-11-08 设计创作，主要内容包括：本发明公开了一种开关磁阻电机驱动器运行智能控制方法,本发明所述的开关磁阻电机驱动器采用不对称半桥电路拓扑,利用电路原理与开关磁阻电机原理,在开关磁阻电机驱动装置某一回路出现过流故障时,封锁故障相电流,保持其他回路的电流输出,使其他定子磁极产生磁场,达到对开关磁阻电机静态保持锁止的目的。该方法简单、运算量小、可靠性高,可在无位置传感器、不增加系统硬件的前提下实施,为开关磁阻电机某一回路过流故障时的电机静态锁止提供了一种处理方法。(The invention discloses an intelligent control method for switched reluctance motor drivers, which adopts an asymmetric half-bridge circuit topology, utilizes a circuit principle and a switched reluctance motor principle, blocks fault phase current when an overcurrent fault occurs in a certain loop of a switched reluctance motor driving device, keeps current output of other loops, and enables other stator magnetic poles to generate magnetic fields so as to achieve the aim of statically keeping locking of the switched reluctance motor.)

The intelligent control method for the operation of the switched reluctance motor driver comprises the following steps when a th phase in a four-phase asymmetric half-bridge circuit fails, and is characterized in that:

step 1, when an phase overcurrent detection circuit reports an overcurrent fault, an asymmetric half-bridge control system controls the control pulse output of a phase upper bridge arm and a phase lower bridge arm to be a low level so as to block the control pulse of a phase upper bridge arm and a phase lower bridge arm, a main switching device of a phase upper bridge arm and a phase lower bridge arm is turned off, and the phase current output is stopped;

step 2, after an th phase upper bridge arm and a th phase lower bridge arm are blocked, the asymmetric half-bridge control system sets a control pulse of a lower corresponding to a main switching device of a second phase winding asymmetric half-bridge lower bridge arm in the rotation direction of the switched reluctance motor as a high-level normally open signal so as to open the second phase winding asymmetric half-bridge lower bridge arm, and the upper bridge arm controls the output current of the second phase winding to reach m% of the rated current of the motor according to a PI regulating current method, wherein the value of m is a set value;

and step 3: after the second-phase current reaches m% of the rated current of the motor, maintaining the time t1 to enable the motor rotor to be stable in a static locking state, and then adjusting the given value of the second-phase current PI regulation to enable the second-phase current to be linearly reduced to n% of the rated current within the time t2, wherein the value of n can be set;

step 4, after the current of the second phase is stabilized at the rated current of n percent, the asymmetric half-bridge control system sends a fault signal to the superior centralized control equipment to inform the th phase of overcurrent fault in operation, the second phase is in the state of n percent of the rated current, the motor is stabilized in a static locking state, and the superior centralized control equipment is requested to start an emergency disposal scheme;

and 5: and after the upper-level centralized control equipment is subjected to emergency treatment, a static locking releasing instruction is issued to the control system of the asymmetric half bridge, the control pulse output of the second-phase upper and lower bridge arms is controlled by the asymmetric half bridge control system to be low level, so that the trigger signal of the main switching devices of the second-phase upper and lower bridge arms is stopped, the main switching devices of the second-phase upper and lower bridge arms are turned off, the current output of the second phase is stopped, and the static locking of the motor is released.

2. The intelligent control method for the operation of the switched reluctance motor driver according to claim 1, wherein the static locking state is a state in which the motor rotor is contracting brake, the output current of the corresponding phase at the lower position of the motor rotation direction of the fault phase is stabilized at n% of the rated current, the -th phase is the fault phase, the static locking state is the state in which the motor rotor is contracting brake, and the output current of the second phase is stabilized at n% of the rated current.

3. The intelligent control method for the operation of the switched reluctance motor driver according to claim 1, wherein: the switched reluctance motor driver adopts an asymmetric half-bridge circuit, all phases are the same in topology and are independent, and the driver can respectively control the on-off of the upper bridge arm IGBT and the lower bridge arm IGBT.

4. The intelligent control method for the operation of the switched reluctance motor driver according to claim 1, wherein: and when the other phases have overcurrent faults, the other phases are processed in the same way.

Technical Field

The invention relates to the technical field of motor driver control, in particular to an intelligent control method for the operation of a switched reluctance motor driver.

Background

At present, the switched reluctance motor has the advantages of simple and firm structure, flexible control, wide speed regulation range, position closed loop during the operation without a position sensor and the like, so the switched reluctance motor is increasingly applied to the fields of electric automobiles, lifting machines, traction machines and the like, and the topology of a driving circuit is an asymmetric half-bridge circuit with independent phases, so the current of each phase is relatively independent and can be respectively controlled.

Disclosure of Invention

The invention aims to provide intelligent control methods for the operation of a switched reluctance motor driver, which can control the switched reluctance motor driver to keep outputting zero-speed full torque when an asymmetric half-bridge circuit has single-phase overcurrent faults.

The technical scheme adopted by the invention is as follows:

switched reluctance motor driver operation intelligent control method, when the asymmetric half bridge circuit single phase bridge arm trouble, control the switched reluctance motor static state to keep full torque, for the convenience of explanation, regard the trouble phase in the four-phase asymmetric half bridge circuit as A looks as the example, its characterized in that:

step 1: when the A-phase overcurrent detection circuit reports an overcurrent fault, the asymmetric half-bridge control system controls the control pulse output of the A-phase upper bridge arm and the A-phase lower bridge arm to be a low level so as to block the control pulse of the A-phase upper bridge arm and the control pulse of the A-phase lower bridge arm, and the main switching devices of the A-phase upper bridge arm and the A-phase lower bridge arm are turned off to stop the A-phase current output.

And 2, after the upper and lower bridge arms of the phase A are blocked, setting control pulses of a main switching device of the lower bridge arm of the asymmetric half bridge of the phase B corresponding to the lower of the rotating direction of the switched reluctance motor into high-level normally open signals by the asymmetric half bridge control system, so that the lower bridge arm of the asymmetric half bridge of the phase B is opened, and controlling the output current of the phase B winding to reach m% of the rated current of the motor by the upper bridge arm according to a PI regulated current method, wherein the value of m can be set.

And step 3: after the phase B current reaches m% of the rated current of the motor, maintaining the time t1 to enable the rotor of the motor to be stable in a static locking state, and then adjusting the given value of the phase B current PI regulation to enable the phase B current to be linearly reduced to n% of the rated current within the time t2, wherein the value of n can be set.

And 4, step 4: after the phase B current is stabilized at n% of the rated current, the asymmetric half-bridge control system sends a fault signal to the upper-level centralized control equipment to inform the phase A of overcurrent fault in operation, the phase B is in a state of n% of the rated current, the motor is stabilized in a static locking state, and the upper-level centralized control equipment is requested to start an emergency disposal scheme.

And 5: after the upper-level centralized control equipment is subjected to emergency treatment, a static locking releasing instruction is issued to a control system of the asymmetric half bridge, the control pulse of the upper bridge arm and the lower bridge arm of the B phase is controlled to be in a low level by the control system of the asymmetric half bridge, so that the trigger signal of the main switching devices of the upper bridge arm and the lower bridge arm of the B phase is stopped, the main switching devices of the upper bridge arm and the lower bridge arm of the B phase are turned off, the current output of the B phase.

The static locking state refers to the state that the motor rotor is in a brake state, and the output current of the corresponding phase below in the motor rotating direction of the fault phase is stabilized at n% of the rated current.

The invention is a method for statically keeping locking of zero-speed full torque output by a switched reluctance motor driver under single-phase overcurrent fault based on an asymmetric half-bridge circuit, adopts an asymmetric half-bridge circuit topological structure, utilizes a circuit principle and a switched reluctance motor principle, and outputs current to other loops when a certain loop of a switched reluctance motor driving device has bridge arm fault so as to enable other stator magnetic poles to generate magnetic fields and finally achieve the aim of statically keeping locking of the switched reluctance motor.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a flow chart of the present invention;

FIG. 2 is a diagram of a driving main circuit of an asymmetric half-bridge four-phase switched reluctance motor according to an embodiment of the present invention;

FIG. 3 is a circuit diagram of phase operation of an asymmetric half-bridge switched reluctance motor according to an embodiment of the present invention;

fig. 4 is a diagram of phase current waveforms corresponding to a failed phase and a rotational direction in accordance with an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only partial embodiments of the present invention , rather than all embodiments.

In the description of the present invention, it is to be noted that, for the orientation words, there are terms such as "center", "lateral", "longitudinal", and the like

The terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used to designate an orientation or positional relationship that is based on what is shown in the drawings for convenience in describing the invention and to simplify the description, but do not designate or imply that the device or element so designated must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the specific scope of the invention.

Moreover, it is intended to cover non-exclusive inclusions, such that a process, method, system, article, or apparatus that comprises a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As shown in fig. 1, 2 and 3, the present invention includes kinds of intelligent control methods for the operation of the switched reluctance motor driver, which can control the switched reluctance motor driver to keep outputting zero-speed full torque when the asymmetric half-bridge circuit has a single-phase overcurrent fault.

The switched reluctance motor driver adopts an asymmetric half-bridge circuit, and a topological main circuit is shown in figure 1. An external power supply is applied to two ends of each phase winding through a capacitor C, wherein the anode of each phase winding is connected to P + and the cathode is connected to N-. The asymmetric half-bridge circuit of each phase of winding is the same, and comprises two main switching devices, two freewheeling diodes, a filter inductor and a current detection device, wherein the main switching devices of the A phase are V1 and V2, the freewheeling diodes are VD1 and VD2, the filter inductor is A, the current detection device is TA1, the main switching devices of the B phase are V3 and V4, the freewheeling diodes are VD3 and VD4, the filter inductor is B, the current detection device is TA2, the main switching devices of the C phase are V5 and V6, the freewheeling diodes are VD5 and VD6, the filter inductor is C, the current detection device is TA3, the main switching devices of the D phase are V7 and V8, the freewheeling diodes are VD7 and VD8, the filter inductor is D, and the current detection device is TA 4.

When a single-phase bridge arm fault occurs in the asymmetric half-bridge circuit, the switched reluctance motor is controlled to statically maintain full torque, for convenience of description, a fault phase in the four-phase asymmetric half-bridge circuit is taken as an A phase, an action phase is taken as a B phase as an example, and the action phase in actual use can be any phases except the A phase:

step 1: when the A-phase overcurrent detection circuit reports an overcurrent fault, the asymmetric half-bridge control system controls the control pulse output of the A-phase upper and lower bridge arm main switching devices V1 and V2 to be a low level so as to block the control pulse of the A-phase upper and lower bridge arms, and switches off the A-phase upper and lower bridge arm main switching devices V1 and V2 to stop the A-phase current output.

And 2, after the main switching devices V1 and V2 of the upper and lower bridge arms of the phase A are blocked, the control pulse of the main switching device V4 of the lower bridge arm of the asymmetric half bridge of the phase B winding corresponding to the lower of the switched reluctance motor in the rotating direction is set as a high-level normally open signal by the asymmetric half bridge control system, so that the lower bridge arm of the asymmetric half bridge of the phase B winding is opened, the upper bridge arm controls the output current of the phase B winding to reach m% of the rated current of the motor according to a PI regulated current method, and the value of m can be set.

And step 3: after the phase B current reaches m% of the rated current of the motor, maintaining the time t1 to enable the rotor of the motor to be stable in a static locking state, and then adjusting the given value of the phase B current PI regulation to enable the phase B current to be linearly reduced to n% of the rated current within the time t2, wherein the value of n can be set.

And 4, step 4: after the phase B current is stabilized at the rated current of n%, the asymmetric half-bridge control system sends a fault signal to the upper-level centralized control equipment to inform the phase A of overcurrent fault in operation, the phase B is in the state of n% of the rated current, the motor is stabilized in a static locking state, and the upper-level centralized control equipment is requested to start an emergency disposal scheme.

And 5: after the upper-level centralized control equipment is subjected to emergency treatment, a static locking releasing instruction is issued to a control system of the asymmetric half bridge, the control pulse output of the upper and lower bridge arms of the B phase is controlled to be low level by the control system of the asymmetric half bridge, so that trigger signals of main switching devices V3 and V4 of the upper and lower bridge arms of the B phase are stopped, the main switching devices V3 and V4 of the upper and lower bridge arms of the B phase are turned off, the current output of the B phase is stopped, and the static locking of the motor is released.

The static locking state refers to a state when a motor rotor is in a brake state, and output current of a corresponding phase below in the motor rotation direction of a fault phase is stabilized at n% of rated current.

The patent is just directed at the function of continuously outputting zero-speed full torque after the bridge arm fault of the switched reluctance motor driver based on the multiphase asymmetric half-bridge main loop occurs

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.