CN114362632B - Active discharge control method and control system - Google Patents
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Abstract
The invention provides an active discharge control method and a control system, which relate to the technical field of automobile electronics and are applied to a single-phase open circuit of a multiphase motor, and the method comprises the following steps: the control unit detects an emergency power-down signal; collecting real-time current output by a multiphase motor by adopting a current sensor, wherein the real-time current is any one phase current of two phases of the multiphase motor under a non-open circuit; calculating positive and negative high-frequency current driving signals matched with the real-time current according to the real-time current, wherein the positive and negative high-frequency current driving signals are used for generating positive and negative high-frequency currents; the positive and negative high-frequency currents are set to generate winding loss after being input into the multiphase motor, and output equivalent zero torque; the control unit controls and releases the positive and negative high-frequency currents to be output to the multiphase motor through the inverter for discharging, so that the problem that active discharging cannot be achieved when the motor is in single-phase open circuit is solved.
Description
Technical Field
The invention relates to the technical field of automobile electronics, in particular to an active discharge control method and an active discharge control system.
Background
The new energy automobile works in a high-pressure environment, and along with the rapid development of the new energy automobile, people pay more and more attention to the high-pressure safety of the new energy automobile, and the high-pressure safety requirement of the electric drive system of the new energy automobile is also higher and higher. After the vehicle is stopped and powered down during running, the control unit is internally provided with high voltage, so that the motor system is required to have an active discharge safety strategy.
In the prior art, two discharging modes of hardware discharging and motor winding discharging are generally adopted, wherein the hardware discharging mostly adopts a power discharging resistor, and a discharging strategy is that a whole vehicle controller requests a control unit to execute active discharging, and the control unit confirms that a main positive contactor and a main negative contactor are disconnected, so that the active discharging is started to be executed; the active discharge is to use windings of a multiphase motor for energy consumption. However, when the multiphase motor is in a single-phase open circuit, the remaining two groups of windings can only generate current vectors in a fixed direction, so that the conventional three-phase control system control strategy cannot be used for realizing an active discharge function when the motor is in the single-phase open circuit in the whole vehicle operation process, and the safety risk is high and the motor is damaged greatly.
Disclosure of Invention
In order to overcome the technical defects, the invention aims to provide an active discharge control method and an active discharge control system, which are used for solving the problem that active discharge cannot be realized when a motor is in a single-phase open circuit.
The invention discloses an active discharge control method of a motor, which is applied to a single-phase open circuit of a multiphase motor and comprises the following steps:
the control unit detects the electrical down-signal,
Collecting real-time current output by a multiphase motor by adopting a current sensor, wherein the real-time current is any one phase current of two phases of the multiphase motor under a non-open circuit;
calculating positive and negative high-frequency current driving signals matched with the real-time current according to the real-time current, wherein the positive and negative high-frequency current driving signals are used for generating positive and negative high-frequency currents;
The positive and negative high-frequency currents are set to generate winding loss after being input into the multiphase motor, and output equivalent zero moment;
the control unit controls and releases the positive and negative high-frequency current to be output to the multi-phase motor through the modulation module and the inverter for discharging.
Preferably, the method further comprises:
Collecting the temperature of each phase lower winding of the multi-phase motor by adopting a temperature sensor;
And when the winding temperature of any phase circuit exceeds a threshold value, marking that the phase circuit is in an open circuit state, and other phase circuits are in non-open circuit states.
Preferably, for any phase circuit under two phases that are not open,
And according to the positive and negative high-frequency current released to the multiphase motor and a control strategy executed by the control module, the generated discharge current wave is a single-phase sine wave, a positive and negative direct current wave or a trapezoidal wave.
Preferably, the control unit controls the release of the positive and negative high frequency currents, including the following:
And the control unit executes a PID control strategy, an internal model control strategy or an asymmetric trapezoidal wave control strategy to release the positive and negative high-frequency current.
The invention also provides an active discharge control system, which is characterized by comprising the following steps:
the device comprises a modulation module, an inverter, a multiphase motor and a control unit for active discharge control;
The control unit includes:
A signal receiving subunit, configured to detect a downlink electrical signal by the control unit;
The current acquisition subunit is used for acquiring real-time current output by the multiphase motor by adopting a current sensor, wherein the real-time current is any one phase current of two phases of the multiphase motor under a non-open circuit;
The high-frequency current subunit is used for calculating positive and negative high-frequency current driving signals matched with the real-time current according to the real-time current, and the positive and negative high-frequency current driving signals are used for generating positive and negative high-frequency currents; the positive and negative high-frequency currents are set to generate winding loss after being input into the multiphase motor, and output equivalent zero torque;
and the execution subunit is used for controlling the control unit to release the positive and negative high-frequency current so as to output the positive and negative high-frequency current to the multiphase motor for discharging through the modulation module and the inverter.
Preferably, the method further comprises:
The temperature control subunit is used for acquiring the temperature of each phase lower winding of the multi-phase motor by adopting a temperature sensor; and when the winding temperature of any phase circuit exceeds a threshold value, marking that the phase circuit is in an open circuit state, and other phase circuits are in a non-open circuit state.
Preferably, the execution subunit executes a PID control strategy, an internal model control strategy, or an asymmetric trapezoidal wave control strategy, and releases the positive and negative high-frequency current.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
The scheme is applied to a single-phase open circuit (or open phase) scene of a motor, emergency power-off is performed in the whole vehicle operation process, real-time current of a phase circuit of a multiphase motor in a non-open circuit is obtained, positive and negative high-frequency currents which are positive and negative symmetrical to current vectors of the obtained real-time current are released, high-frequency moment is generated and offset, the high-frequency moment is sequentially generated and offset, the high-frequency moment sequentially passes through a modulation module, an inverter and a multi-phase motor, equivalent zero moment is output, resistance loss is generated by windings of the phase in the non-open circuit on the motor to complete a discharging process, and the problem that active discharging cannot be realized when the motor is in the single-phase open circuit is solved.
Drawings
FIG. 1 is a flow chart of an active discharge control method and control system according to the first and second embodiments of the present invention;
fig. 2 is a schematic diagram of the active discharge control method and control system according to the first and second embodiments of the present invention, which is used for implementing the input to the multiphase motor through the modulation module and the inverter;
FIG. 3 is a schematic diagram showing a discharge current waveform in the first and second embodiments of the active discharge control method and control system according to the present invention;
fig. 4 is a schematic block diagram of a second embodiment of the active discharge control method and control system according to the present invention.
Reference numerals:
51-modulating module; 52-an inverter; 53-multiphase motor; 54-a control unit; 541-a signal receiving subunit; 542-a current acquisition subunit; 543-a high frequency current subunit; 544-execution subunit; 545-temperature control subunit.
Detailed Description
Advantages of the invention are further illustrated in the following description, taken in conjunction with the accompanying drawings and detailed description.
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When referring to the drawings, the same numbers in different drawings indicate the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "in response to a determination" depending on the context.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the invention.
In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanical or electrical, or may be a direct connection between two elements, or may be an indirect connection via an intermediary, as would be understood by one of ordinary skill in the art in view of the specific meaning of the terms.
In the following description, suffixes such as "sub-unit", "component", or "unit" for representing elements are used only for facilitating the description of the present invention, and are not of specific significance in themselves. Thus, a "subunit" and a "component" may be used in combination.
Embodiment one: the present embodiment provides an active discharge control method, referring to fig. 1-3, applied to a single-phase open circuit of a multiphase motor (the following motors are multiphase motors, only for convenience of description, and specifically take a three-phase motor as an example), including the following steps:
S100: the control unit detects the electrical down-signal,
That is, the present embodiment is used for active discharging when the motor is powered down in an emergency during a single-phase open circuit or open phase in the whole vehicle running process, so that subsequent operations need to be performed according to the emergency power down signal, specifically, in a practical scenario, the emergency power down includes power off, a negative electrode connector of a low-voltage electric bottle off, and a BMS fuse off or a maintenance switch off, that is, the emergency power down can be performed actively by an operator or performed passively due to a fault.
Besides the single-phase open circuit or open phase of the motor caused by active operation or fault, specifically, when the current is determined by using the collected real-time current, a current sensor is arranged at each phase output of the multiphase motor, and according to the monitoring result of each current sensor, when a current value of one phase is abnormal (suddenly drops), the phase is marked to be in an open circuit, and the rest phases are normal and are regarded as the condition of lack, at the moment, the active discharge method proposed in the scheme can also be adopted, and specifically comprises the following steps:
S110: collecting the temperature of each phase lower winding of the multi-phase motor by adopting a temperature sensor;
Taking a three-phase motor as an example, three phases (three-phase circuits, in this embodiment, each phase of the motor corresponds to a phase circuit, and it is convenient to directly describe the first phase, the second phase or the third phase) of the multi-phase motor are a first phase circuit, a second phase circuit and a third phase circuit, so that the following description is convenient. Acquiring winding temperatures of a first phase circuit, a second phase circuit and a third phase circuit of the three-phase motor by adopting a temperature sensor; specifically, a plurality of temperature sensors are provided to monitor the temperature of the windings on each phase circuit of the circuit, when the temperature of the windings on each phase circuit rises during locked-rotor (i.e. phase-missing, i.e. when one of the phases is in an open-circuit state), when the temperature of the windings of any one of the phase circuits exceeds a threshold value, the phase windings are not suitable for continuous operation, the phase circuit is marked to be in an open-circuit state, i.e. the phase is in an equivalent open-circuit state, so that the active discharge can be performed by adopting the following mode of releasing positive and negative high-frequency current based on the fact that the phase is regarded as phase-missing or in an open-circuit state.
S120: and when the winding temperature of any phase circuit exceeds a threshold value, marking that the phase circuit is in an open circuit state, and other phase circuits are in non-open circuit states.
I.e. when the winding temperature of the first phase circuit exceeds a threshold value, it is determined that the first phase circuit is in an open state and the second phase circuit and the third phase circuit are in a non-open state. Based on the above, when the temperature of any one of the phase windings is higher, it can be determined that the phase windings are in an open circuit state, and in the above steps, the first phase circuit, the second phase circuit and the third phase circuit are all used for distinguishing the three phases on the motor, and the method is not limited to a specific one-to-one phase, i.e. the second phase circuit or the third phase circuit can be marked as being in an open circuit state.
S200: collecting real-time current output by a multiphase motor by adopting a current sensor, wherein the real-time current is any one phase of current under two phases of the multiphase motor which are in a non-open circuit;
In this embodiment, one of the multiphase motors is in an open circuit, i.e. is in a phase-failure state, and the two-phase windings can only generate current vectors in a fixed direction, at this time, the current vectors generated on the two windings are not opposite to each other, so that the generated moments cannot be offset, and the two currents are consistent in magnitude, so that any phase current can be collected. The current is collected here mainly for use in the subsequent steps.
S300: calculating positive and negative high-frequency current driving signals matched with the real-time current according to the real-time current, wherein the positive and negative high-frequency current driving signals are used for generating positive and negative high-frequency currents;
as described above, the two-phase winding can only generate current vectors in a fixed direction, but at this time, the two current vectors are not opposite (i.e. the directions may be identical or asymmetric), and in step S200, a real-time current is obtained, so that another high-frequency current can be applied to the circuit according to the real-time current, so that the current vectors are generated in positive and negative symmetry with the current vectors generated by the two windings, thereby generating high-frequency moment and canceling positive and negative, and thus solving the problem that active discharge cannot be realized when the motor is opened in a single phase.
It is emphasized that the positive and negative high-frequency currents are set to generate winding loss after being input into the multiphase motor and output equivalent zero torque; the input positive and negative high-frequency current and the current vector corresponding to the real-time current are positive and negative symmetrical and have the same magnitude, so that the moment generated by the real-time current is consistent and offset with each other, and the output equivalent zero moment is required to be calculated theoretically, wherein the equivalent zero moment is adopted for judgment due to the influence of environmental factors in an actual scene, the equivalent moment is an imaginary moment acting on a certain component in the machine, and the instantaneous power is equal to the sum of the instantaneous power of all external forces and the moment actually acting on the machine, namely, the zero moment is obtained by calculation.
S400: the control unit controls and releases the positive and negative high-frequency current (i ref in the figure) so as to be output to the multiphase motor through the modulation module and the inverter for discharging.
In the above steps, the modulation module includes, but is not limited to, PWM (pulse width modulation) (unipolar modulation, bipolar modulation), SPWM (sinusoidal pulse width modulation), in which the SPWM inputs a pulse sequence with equal amplitude to equivalent the sine wave, the pulse time width outputted as high is basically changed in a sine law, and the active discharge of the conventional multiphase motor in the non-phase-failure state adopts SVPWM (space vector pulse width modulation), and the phase failure method is also preferably adopted in this embodiment from the power source perspective by adopting PWM or SPWM method to generate a sinusoidal wave power source with adjustable frequency and voltage. The modulation module is used for adjusting the on-off frequency of positive and negative high-frequency current, and the inverter converts the direct current into alternating current with fixed frequency voltage or frequency modulation and voltage regulation.
Specifically, the control unit controls and releases the positive and negative high-frequency current, and the control unit comprises the following steps: the control unit executes a PID control strategy, an internal model control strategy or an asymmetric trapezoidal wave control strategy to release the positive and negative high-frequency current, specifically, the asymmetric trapezoidal wave control strategy may form a discharging current with a waveform as shown in (fig. 3 (c)) as a trapezoidal wave, the asymmetric trapezoidal wave control strategy is used for explaining the asymmetric trapezoidal wave control strategy, the execution of the asymmetric trapezoidal wave control strategy includes a first control flow (D1) and a second control flow (D2), D1 is used for adjusting rising edge time of the trapezoidal wave, D2 is used for adjusting falling edge time of the trapezoidal wave, then a set of D1 and D2 values exist, so that the trapezoidal wave is converted into a triangular wave, and the trapezoidal wave frequency is fixed, and the first control flow is required to be adapted according to a voltage grade and motor information, when the dc bus voltage is high, D1 is larger, the rising time of the trapezoidal wave current is prolonged, the current is increased, d2=d1+d3, and D3 is a compensation amount for inhibiting dc bias of the trapezoidal wave. Considering the asymmetry of the modulation and inverter module output currents, which may cause motor output current asymmetry, D3 is required to be used for regulation, e.g., when the trapezoidal wave has a forward dc bias, D3>0, D2> D1; at this time, the falling time of the trapezoidal wave > the rising time of the trapezoidal wave, and the forward DC bias of the trapezoidal wave is reduced. To determine whether this dc bias is present, it may be convenient to detect the current point I1 at the falling edge midpoint of the trapezoidal wave, if I1>0 (with a certain threshold range) then the dc bias is considered to be present.
The PID control strategy is implemented to generate a single-phase sine wave, a positive and a negative direct current wave, as follows (specifically, different waveforms are generated according to the difference of positive and negative high frequency current waveforms), and the PID control strategy includes P proportional control, I integral control and D differential control, and in classical PID control, the PID control strategy is provided with the capability of suppressing high frequency noise and low frequency external disturbance, more specifically, by way of example and not limitation, the PID control strategy and bipolar PWM modulation are adopted to generate a discharge current which can have a sine waveform (fig. 3 (a)), and the internal model control strategy and unipolar PWM modulation are adopted to generate a discharge current with a positive and a negative direct current waveform (fig. 3 (b)). Besides the asymmetric trapezoidal wave control strategy, the PID control strategy or the internal model control strategy, a hysteresis current control strategy can be adopted, the hysteresis control is also called ripple regulator control, and the hysteresis control is to connect the output of the switch function calculation module to the hysteresis comparator to generate control pulse so as to control the on-off state of the switch, thereby realizing the control target.
Therefore, based on the above, referring to fig. 3, for either one of the two phases that are not open, the generated discharge current wave is a single-phase sine wave (fig. 3 (a)), a positive and negative direct current wave (fig. 3 (b)) or a trapezoidal wave (fig. 3 (c)) according to the positive and negative high frequency currents discharged to the multi-phase motor and the control strategy performed by the control unit. Unlike the conventional winding discharge in the non-phase-failure state of the multiphase motor, the conventional motor can only generate three-phase sine wave-shaped discharge current, and in the embodiment, the positive and negative high-frequency currents symmetrical to the current in the non-phase-failure circuit of the motor are introduced, so that the single-phase sine wave, positive and negative direct current waves or trapezoidal wave discharge current can be generated in each phase of the motor in a non-open circuit state according to the positive and negative high-frequency currents and the control strategy (including the asymmetric trapezoidal wave control strategy and the PID control strategy).
In the embodiment, when the motor is powered down during single-phase open circuit or open phase in the whole vehicle running process, the real-time current of the phase circuit of the motor which is in a non-open circuit is monitored, and positive and negative high-frequency currents which are positive and negative symmetrical to the current vector of the real-time current are released, so that high-frequency moment is generated and offset each other, equivalent zero moment is output, the resistance loss is generated by the windings of the remaining phase which is in the non-open circuit to complete the discharging process, the problem that active discharging cannot be realized during the single-phase open circuit of the motor is solved, and the on-off frequency of the positive and negative high-frequency currents can be regulated by a module to realize different control strategies and control the discharging current which forms no waveform so as to meet the requirements of different scenes.
Embodiment two: the present embodiment provides an active discharge control system, referring to fig. 1 to 4, for executing the active discharge control method according to the first embodiment, specifically including the following steps:
A modulation module 51, an inverter 52, a multiphase motor 53, and a control unit 54 for active discharge control; the control unit 54 is configured to receive an emergency power down signal, and input positive and negative high frequency currents to sequentially pass through the modulation module 51, the inverter 52, and the multi-phase motor 53, and output an equivalent zero torque for active discharge under open-phase conditions of a phase-failure or motor (multi-phase motor, for simplicity and convenience).
Referring to fig. 3, the control unit 54 includes:
A signal receiving subunit 541 for controlling the unit to detect a lower electrical signal;
A current acquisition subunit 542, configured to acquire a real-time current output by the multiphase motor by using a current sensor, where the real-time current is any one of two phases of current of the multiphase motor under a non-open circuit;
specifically, the current vectors generated on the two windings are not opposite to each other, so that the generated moments cannot be offset, and the two currents are consistent in size, so that the current acquisition subunit controls the current sensor to acquire any phase current.
A high-frequency current subunit 543 configured to calculate, according to the real-time current, a positive and negative high-frequency current driving signal matched with the real-time current, where the positive and negative high-frequency current driving signal is used to generate a positive and negative high-frequency current; the positive and negative high-frequency currents are set to generate winding loss after being input into the multiphase motor, and output equivalent zero torque;
Specifically, because the directions of the two windings are not opposite, the mutual offset moment cannot be generated, another high-frequency current can be applied to the circuit according to the real-time current, so that the current vector which is symmetrical to the positive and negative current vectors generated by the two windings is generated, the high-frequency moment is generated, and the positive and negative offset is realized, so that the problem that active discharging cannot be realized when the motor is in a single-phase open circuit is solved, and the high-frequency current subunit 543 can determine the magnitude of the positive and negative high-frequency current required by the motor according to the current acquisition subunit 542, so that the current which just outputs the equivalent zero moment is introduced.
An execution subunit 544, configured to control the control unit to release the positive and negative high-frequency currents, so as to output the positive and negative high-frequency currents to the multiphase motor for discharging through the modulation module 51 and the inverter 52. Specifically, the execution subunit 544 executes a PID control strategy, an internal mode control strategy, or an asymmetric trapezoidal wave control strategy, and releases the positive and negative high-frequency currents. Besides executing the PID control strategy, the internal model control strategy or the asymmetric trapezoidal wave control strategy as described in the first embodiment, the hysteresis current control strategy can also be adopted, and the modulation module can be adopted to automatically control and realize the on-off frequency adjustment of the high-frequency current so as to generate the discharge current of the single-phase sine wave, the positive and negative direct current waves or the trapezoidal wave, so that the requirements of different scenes can be met.
Specifically, as an option, the active discharge control system further includes:
a temperature control subunit 545, configured to collect the temperature of each phase lower winding of the multiphase motor by using a temperature sensor; and when the winding temperature of any phase circuit exceeds a threshold value, marking that the phase circuit is in an open circuit state, and other phase circuits are in a non-open circuit state.
Besides the single-phase open circuit or open phase of the motor caused by active operation or faults, the condition that the real-time current suddenly changes or the temperature changes exceed a preset range can be regarded as open phase, so that the active discharge method of the scheme is used, when the three-phase motor is used for determining by using the collected real-time current, current sensors are arranged at the output of each phase of the multi-phase motor, according to the monitoring result of each current sensor, when the current value of one phase is abnormal (suddenly drops), the phase is marked to be in open circuit, and the rest two phases are normal. When determining the temperature of each phase, the temperature control subunit 545 may be used to collect the temperature of each phase, and the temperature of the winding on the phase circuit may increase when the phase is blocked (i.e., the phase is open, i.e., one of the phases is open), so that the phase is not suitable to continue to operate, and thus it may be determined which phase corresponds to the open phase or is open based on the temperature.
In this embodiment, in the case of a single-phase open circuit (or phase-missing) of the motor (or in the case of an equivalent phase-missing situation determined by the temperature control subunit 545), after the signal receiving subunit 541 receives the electrical signal during the whole vehicle running, the current obtaining subunit 542 monitors the real-time current of the phase circuit of the motor in a non-open circuit, the executing subunit 544 releases the positive and negative high-frequency currents which are obtained from the high-frequency current subunit 543 and are positive and negative symmetrical to the current vector of the real-time current, so as to generate high-frequency torque and offset each other, output equivalent zero torque, sequentially pass through the modulating module 51, the inverter 52 and the multiphase motor 53, output equivalent zero torque, generate resistance loss by using the windings of the phase in a non-open circuit to complete the discharging process, thereby solving the problem that active discharging cannot be achieved when the motor is in a single-phase open circuit, and also can use different control strategies (such as the PID control strategy and the asymmetric trapezoidal wave control strategy) to generate discharging currents in different waveforms, the modulating module 51 adjusts the on-off frequencies of the positive and negative high-frequency currents, so as to meet the user requirements in different situations.
It should be noted that the embodiments of the present invention are preferred and not limited in any way, and any person skilled in the art may make use of the above-disclosed technical content to change or modify the same into equivalent effective embodiments without departing from the technical solution of the present invention, and any modification or equivalent change and modification of the above-described embodiments according to the technical substance of the present invention still falls within the scope of the technical solution of the present invention.
Claims (7)
1. The active discharge control method is characterized by being applied to a single-phase open circuit of a multiphase motor and comprising the following steps of: the control unit detects the electrical down-signal,
Collecting real-time current output by a multiphase motor by adopting a current sensor, wherein the real-time current is any one phase current of two phases of the multiphase motor under a non-open circuit;
Calculating positive and negative high-frequency current driving signals matched with the real-time current according to the real-time current, wherein the positive and negative high-frequency current driving signals are used for generating positive and negative high-frequency currents;
The positive and negative high-frequency currents are set to generate winding loss after being input into the multiphase motor, and output equivalent zero torque; the control unit controls and releases the positive and negative high-frequency current to be output to the multiphase motor through the modulation module and the inverter for discharging.
2. The control method according to claim 1, characterized by further comprising:
Collecting the temperature of each phase lower winding of the multi-phase motor by adopting a temperature sensor;
When the winding temperature of any phase circuit exceeds a threshold value, the phase circuit is marked to be in an open circuit state, and other phase circuits are marked to be in non-open circuit states.
3. The control method according to claim 1, characterized in that:
For any phase circuit in the two phases that are not open,
And according to the positive and negative high-frequency current released to the multiphase motor and a control strategy executed by the control module, the generated discharge current wave is a single-phase sine wave, a positive and negative direct current wave or a trapezoidal wave.
4. The control method according to claim 1, characterized in that the control unit controls the release of the positive and negative high-frequency currents, comprising the following:
And the control unit executes a PID control strategy, an internal model control strategy or an asymmetric trapezoidal wave control strategy to release the positive and negative high-frequency current.
5. An active discharge control system, comprising:
the device comprises a modulation module, an inverter, a multiphase motor and a control unit for active discharge control;
The control unit includes:
A signal receiving subunit, configured to detect a downlink electrical signal by the control unit;
The current acquisition subunit is used for acquiring real-time current output by the multiphase motor by adopting a current sensor, wherein the real-time current is any one phase current of two phases of the multiphase motor under a non-open circuit;
the high-frequency current subunit is used for calculating positive and negative high-frequency current driving signals matched with the real-time current according to the real-time current, and the positive and negative high-frequency current driving signals are used for generating positive and negative high-frequency currents; the positive and negative high-frequency currents are set to generate winding loss after being input into the multiphase motor, and output equivalent zero torque;
and the execution subunit is used for controlling the control unit to release the positive and negative high-frequency current so as to output the positive and negative high-frequency current to the multiphase motor for discharging through the modulation module and the inverter.
6. The active discharge control system of claim 5, further comprising:
The temperature control subunit is used for acquiring the temperature of each phase lower winding of the multi-phase motor by adopting a temperature sensor; when the winding temperature of any phase circuit exceeds a threshold value, the phase circuit is marked to be in an open circuit state, and other phase circuits are marked to be in non-open circuit states.
7. The active discharge control system of claim 5, comprising the following:
The execution subunit executes a PID control strategy, an internal model control strategy or an asymmetric trapezoidal wave control strategy to release the positive and negative high-frequency current.
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