CN206629008U - Vidacare corp, electric drive system and electrical equipment - Google Patents

Abstract

The utility model provides an electric drive device, an electric drive system and electric equipment with a binary structure. The electric drive control device provided by the utility model is set in the electric equipment and is used to drive the multi-phase motor in the electric equipment, including: a DC power supply; a command sending part; a current sensor; an output sensor; a controller; a driver; a power converter , where the power converter has (i+j) independent power conversion units with the same parameters, the controller includes at least two control units that independently output motor control signals, and the driver has (i+j) independent and parameterized For the same drive unit, i drive units receive a motor control signal output by one control unit, j drive units receive motor control signals output by other control units, j is a positive integer greater than 1, and i is 1.

Description

Electric drives, electric drive systems and electric equipment

technical field

The utility model belongs to the field of motors, in particular to an electric driving device, an electric driving system including the electric driving device and electric equipment.

Background technique

As a large manufacturing country, with the development of economy and society, China will be subject to more and more constraints in terms of resources, environment and labor costs. my country's manufacturing industry is facing severe challenges of industrial transformation and upgrading. To realize the upgrading of manufacturing industry, it is necessary to develop advanced high-end equipment manufacturing industry. Compared with the international advanced technology level, our country still has a certain gap in this field. The study of high-performance electric drive devices is conducive to supporting and promoting the development and progress of this field in our country.

In high-performance electric drives, in order to obtain faster dynamic response and better steady-state performance, current negative feedback control is added, that is, the line current flowing through the motor winding is controlled while controlling the speed or torque. In the digital control system, since the power converter, driver, controller and sensor are not continuous analog systems, there are a series of influencing factors such as dead zone, time delay, uncertainty, disturbance and nonlinearity, which lead to the line current The change is not continuous, there is a minimum change in current. The minimum variation of the motor current further affects the quality of the steady-state performance.

In the three-phase electric drive device shown in Figure 2, the line current of the motor is provided by the power converter, and the upper and lower bridge arms of each phase in the power converter are composed of multiple power switch tubes connected in parallel, each The power switch tubes all have a minimum change in output current, so the minimum change in the line current of the motor is the sum of the minimum changes in the output current of multiple parallel-connected power switch tubes.

In electric drives, the greater the power, the greater the current resolution. This problem seriously affects the performance of high-power electric equipment, such as high-speed elevators, CNC machine tools, electric drive trains, electric vehicles and electric aircraft.

Utility model content

The utility model is developed to solve the above problems, and aims to provide an electric drive device, an electric drive system and electric equipment with a binary structure.

<Structure 1>

The utility model provides an electric drive control device, which is arranged in electric equipment and is used to drive a multiphase motor in the electric equipment. The multiphase motor has (i+j) multiphase winding units that are independent from each other and have the same parameters. It includes: a DC power supply with a constant voltage corresponding to the rated line voltage of the multi-phase motor, and is used to provide a line current corresponding to the rated line current of the multi-phase motor; a command sending part, which sends the output speed of the multi-phase motor or The command signal corresponding to the value of the torque; the current sensor, which detects the line current value of the multi-phase winding unit, and sends the corresponding current feedback signal; the output sensor, which detects the output speed or torque of the multi-phase motor, and sends the corresponding output Feedback signal; controller, calculate and output the operation control signal and motor control signal according to the command signal, current feedback signal and output feedback signal; the driver, enter the working state or stop state under the action of the running control signal, in the working state according to the motor control The signal generates a driving signal; and a power converter, under the action of the driving signal, converts the direct current into the line current required by the multi-phase motor, and it is characterized in that: wherein, the power converter has a multi-phase winding unit with (i+j) A correspondingly connected (i+j) power conversion units that are independent of each other and have the same parameters, the controller includes at least two control units that independently output motor control signals, and the driver has (i+j) drive units that are independent of each other and have the same parameters The units are respectively connected to (i+j) power conversion units, i drive units receive the motor control signal output by one control unit, j drive units receive the motor control signal output by other control units, and j is greater than 1 Positive integer, i is 1.

In the electric driving device provided by the utility model, it may also have such a feature: wherein, when the effective value of the maximum continuous operating current normally output by the single power conversion circuit of the power conversion unit is I ₁ , the maximum line current of the multi-phase motor is effective When the value is IN, the number j of multi _- phase winding units satisfies the following conditions:

(i+j)＞I _N ÷ I ₁ ,

Wherein, j is a positive integer greater than 1, and i is 1.

In the electric driving device provided by the utility model, it can also have such a feature: wherein, the multi-phase motor is any one of asynchronous motor, synchronous motor, switched reluctance motor, brushless DC motor, and the winding of the multi-phase motor The number of parallel windings can be divisible by the number of polyphase winding units (i+j), and the number of winding phases, winding phase sequence, winding turns, winding connection mode and rated voltage of the polyphase motor winding and polyphase winding unit are the same.

In the electric driving device provided by the utility model, it may also have such a feature: wherein, the DC power supply is a battery pack or a rectified power supply.

In the electric driving device provided by the utility model, it may also have such a feature: wherein, the power conversion unit is composed of at least one intelligent power module or includes a plurality of power switch tubes of the same type and parameters, and the power switch tubes are electric Any of field effect transistors, gate turn-off thyristors, integrated gate commutated thyristors, insulated gate bipolar transistors, power bipolar transistors, and gate commutated thyristors.

<Structure 2>

Further, the utility model also provides an electric driving system, which is set in the electric equipment and used to drive the electric equipment, and is characterized in that it includes: a multi-phase motor with rated line voltage and rated line current, with (i+j ) multi-phase winding units that are independent of each other and have the same parameters; and an electric drive control device for driving a multi-phase motor, wherein the electric drive control device is the electric drive control device in <Structure 1>, j is a positive value greater than 1 Integer, i is 1.

<Structure 3>

Further, the utility model also provides an electric device including the above-mentioned electric drive system.

Function and effect of utility model

According to the electric drive device, electric drive system and electric equipment involved in the utility model, the multiphase motor winding has (i+j) multiphase winding units, the power converter has (i+j) power conversion units, and the controller Contains at least two control units that independently output motor control signals, the driver has (i+j) drive units connected to (i+j) power conversion units respectively, and the i drive units receive the motor control output from one control unit signal, j driving units receive motor control signals output by other control units, that is, a control unit and correspondingly connected i driving units, i power conversion units and i multi-phase winding units form the first adjustment unit, Other control units and the correspondingly connected j drive units, j power conversion units and j multi-phase winding units form the second adjustment unit, so when the control unit controls the line current output by the power conversion unit to change, the current is the smallest The amount of change is reduced to one (i+j) of the original electric drive device with only one control unit, which rapidly reduces the minimum output current and improves the accuracy and steady-state performance of the electric drive device.

To sum up, the electric driving device, electric driving system and electric equipment of the present invention have the advantages of simple and reasonable structural design, high resolution and superior performance.

Description of drawings

Fig. 1 is the schematic diagram of the circuit structure of the electric drive system in the embodiment of the utility model; And

Fig. 2 is a schematic diagram of a circuit structure of a common multi-phase motor and a power converter in the prior art.

detailed description

In order to make the technical means, creative features, goals and effects achieved by the utility model easy to understand, the specific implementation of the utility model will be described below in conjunction with the accompanying drawings.

The electric driving system 10 is set in electric equipment such as high-speed elevators, numerical control machine tools, electric drive trains, electric vehicles and electric aircraft, and is used to drive electric equipment.

Fig. 1 is a schematic diagram of the circuit structure of the electric drive system in this embodiment.

As shown in FIG. 1 , the electric drive system 10 includes a multi-phase motor 11 and an electric drive device.

The multi-phase motor 11 has k phases and has a rated line voltage and a rated line current. The multi-phase motor 11 is any one of an asynchronous motor, a synchronous motor, a switched reluctance motor, and a brushless DC motor. In this embodiment, the multi-phase motor 11 is an asynchronous motor, and the multi-phase motor 11 is a binary motor.

The multiphase motor 11 has an armature and multiphase motor windings mounted on the armature. In this embodiment, the number of sets of multi-phase motor windings is the same as the number of armatures. When the number of armatures is two or more, two or more sets of multi-phase motor windings are used. Each set of multiphase motor windings includes (i+j) multiphase winding units 111 that are independent of each other and have the same parameters, and the number of (i+j) can be averagely split by the number of parallel windings of the multiphase motor 11 windings The number of j is greater than or equal to 2, and the number of i is equal to 1. Before and after splitting, the number of winding phases, winding phase sequence, number of winding turns, winding connection mode and rated voltage of the multiphase motor winding and (i+j) multiphase winding units remain unchanged.

In this embodiment, k is three, that is, the multi-phase motor 11 is a three-phase motor, correspondingly, the multi-phase winding unit 111 is a three-phase winding unit, and each three-phase winding unit has three independent windings A, B, c.

The electric driving device is a binary driving device, including a DC power supply 12 , a command sending unit 13 , a current sensor 14 , an output sensor 15 , a controller 16 , a driver 19 and a power converter 20 .

The DC power supply 12 has a constant voltage corresponding to the rated line voltage of the polyphase motor 11, and the DC power supply 12 is a battery pack or a rectified power supply, and the battery pack includes at least one series battery pack or series-parallel battery pack. In this embodiment, the DC power supply 12 is a battery pack, and the battery pack includes a series-parallel battery pack.

The command transmission unit 13 transmits a command signal corresponding to the value of the rotation speed or torque output by the multi-phase motor 11 .

The current sensor 14 detects the line current output by the power conversion unit and outputs a corresponding current feedback signal. The current feedback signal is received by the controller 16 .

The output sensor 15 detects the rotational speed or torque output by the multi-phase motor and outputs a corresponding output feedback signal. The output feedback signal is received by the controller 16 .

The controller 16 calculates and outputs the operation control signal 17 and the motor control signal 18 of the drive unit according to the command signal from the command sending unit 13 , the current feedback signal from the current sensor 14 , the output feedback signal from the output sensor 15 and the battery feedback signal from the controller 16 .

The driver 19 enters the working state under the control of the operation control signal 17, and the driver 19 generates a driving signal for driving the power conversion circuit to work. The driver 19 generates a driving signal for controlling the power converter 20 according to the motor control signal 18 .

The power converter 20 converts the DC power into the voltage and current required by the multi-phase motor 11 under the action of the driving signal. The power converter 20 includes i power conversion units 201 and j power conversion units 202 respectively corresponding to (i+j) multi-phase winding units 111 .

The driver 19 has an independent drive unit 191 and j drive units 192 that are independent of each other and have the same parameters. The drive unit 191 only receives the motor control signal 181 sent by the control unit 161, and each drive unit 192 simultaneously receives the motor control signal 181 sent by the control unit 162. One drive unit 191 is connected to one power conversion unit 201 , and j drive units 192 are connected to j power conversion units 202 respectively. The driving unit 192 enters the working state or the stopping state according to the operation control signal 17 . Each drive unit 191 and 192 can send out A-phase drive signal, B-phase drive signal and C-phase drive signal, and the three-phase drive signal drives the A-phase power conversion circuit, B-phase power conversion circuit and C-phase power conversion circuit respectively. The power switch tube to turn it on or off.

Each power conversion unit 201 and 202 has three parallel-connected A-phase power conversion circuits, B-phase power conversion circuits and C-phase power conversion circuits with the same structure and parameters. The A-phase power conversion circuit is connected to the connection point of the A-phase winding and the C-phase winding in the winding unit, the B-phase power conversion circuit is connected to the connection point of the B-phase winding and the A-phase winding in the winding unit, and the power conversion circuit is connected to the winding unit. The connection points of the C-phase winding and the B-phase winding respectively provide line current to the corresponding multi-phase winding units.

Each power conversion circuit contains two power switch tubes. The two power switches have the same maximum continuous operating current. The working current must be less than the maximum continuous working current, so that the power switch tube can run stably for a long time. If the working current exceeds this current value, the power switch tube will be broken down and damaged due to overcurrent.

In this embodiment, the power conversion units 201 and 202 may be composed of intelligent power modules, or may be composed of a plurality of power switch tubes of the same type and parameters.

The power switch tube is a power field effect transistor (Power MOSFET), a gate turn-off thyristor (GTO), an integrated gate commutation thyristor (IGCT), an insulated gate bipolar transistor (IGBT), and a power bipolar transistor ( GTR) and gate commutated thyristor (SGCT).

In this embodiment, (i+j) mutually independent drive units 192 are respectively connected to (i+j) mutually independent power conversion units 202 with the same parameters and give (i+j) mutually independent and parameterized power conversion units 202 The same polyphase winding unit 111 supplies power.

The number of multi-phase winding units in this embodiment is i+j, j is an integer, i is 1, and the following conditions are met: (i+j)>I _N ÷ I ₁ , where I ₁ is the power conversion The maximum continuous operating current effective value normally output by the unit's single power conversion circuit, IN is the maximum line current effective value of the multi _- phase motor.

In this embodiment, the control unit 161 and the correspondingly connected one drive unit 191 and one power conversion unit 201 form the first adjustment unit 211, and the other control unit 162 is connected with j drive units 192 and j The power conversion unit 202 constitutes a second bit adjustment unit 212 . The first bit adjustment unit 211 and the second bit adjustment unit 212 together constitute the binary structure of the electric drive device.

The control units 161 and 162 can independently output the motor control signals 181 and 182 respectively, therefore, the minimum current variations of the line currents output by the power conversion units 201 and 202 are different, and correspond to the minimum current variation output by the power conversion unit 201 is one part j of the minimum current change amount corresponding to the output of the power conversion unit 202 .

When the required change in the line current of the motor is less than j times the minimum change in current, the control unit 161 generates a motor control signal 181; the required change in the line current of the motor is equal to an integer multiple of j times the minimum change in current, control Unit 162 generates motor control signal 182 . Compared with the electric drive device with only one control unit, the line current resolution of the multi-phase motor in the utility model is reduced to one part of the original (1+j).

Function and effect of embodiment

According to the electric drive device, electric drive system and electric equipment involved in this embodiment, the multiphase motor winding has (i+j) multiphase winding units, the power converter has (i+j) power conversion units, and the controller Contains at least two control units that independently output motor control signals, the driver has (i+j) drive units connected to (i+j) power conversion units respectively, and the i drive units receive the motor control output from one control unit signal, j driving units receive motor control signals output by other control units, that is, a control unit and correspondingly connected i driving units, i power conversion units and i multi-phase winding units form the first adjustment unit, Other control units and the correspondingly connected j drive units, j power conversion units and j multi-phase winding units form the second adjustment unit, so when the control unit controls the line current output by the power conversion unit to change, the current is the smallest The amount of change is reduced to one (i+j) of the original electric drive device with only one control unit, which rapidly reduces the minimum output current and improves the accuracy and steady-state performance of the electric drive device.

To sum up, the electric driving device, electric driving system and electric equipment of this embodiment have the advantages of simple and reasonable structural design, high resolution and superior performance.

The above embodiments are preferred cases of the present utility model, and are not intended to limit the protection scope of the present utility model.

Claims (7)

1. a kind of motor-driven control device, is arranged in electrical equipment, for driving the polyphase machine in the electrical equipment, The polyphase machine has (i+j) individual separate and parameter identical polyphase windings unit, including：

Dc source, there is the constant voltage corresponding with the rated line voltage of the polyphase machine, for provide with it is described more The corresponding line current of the specified line current of phase motor；

Sending part is instructed, sends the command signal corresponding with the value of the rotating speed of polyphase machine output or torque；

Current sensor, detect the line current value of the polyphase windings unit, and current feedback signal corresponding to transmission；

Output transducer, detect rotating speed or the torque of the polyphase machine output, and output feedback signal corresponding to transmission；

Controller, calculated according to the command signal, the current feedback signal and the output feedback signal and export operation Control signal and motor control signal；

Driver, enter working condition or halted state under the operation control signal effect, in the operating condition according to institute State motor control signal and produce drive signal；And

Power inverter, the direct current is converted to the line electricity of the polyphase machine needs in the presence of the drive signal Stream,

It is characterized in that：

Wherein, the power inverter has (i+j) to be connected one to one with (i+j) individual polyphase windings unit individual mutually Independence and parameter identical power conversion unit,

The controller includes at least two independent control units for exporting the motor control signal,

The driver have (i+j) it is individual independently of each other and parameter identical driver element, respectively with (i+j) individual power conversion list Member is connected,

The i driver elements receive the motor control signal of a described control unit output, the j driver elements The motor control signal of other described control unit outputs is received,

The j is the positive integer more than 1, and the i is 1.

2. motor-driven control device according to claim 1, it is characterised in that：

Wherein, when the continuous operating current virtual value of maximum that the single power conversion circuit of the power conversion unit normally exports For I₁, the max line current effective value of the polyphase machine is I_NWhen, the number j of the polyphase windings unit meets following conditions：

(i+j) ＞ I_N÷I₁,

Wherein, j is the positive integer more than 1, and the i is 1.

3. motor-driven control device according to claim 1, it is characterised in that：

Wherein, the polyphase machine is any one in asynchronous machine, synchronous motor, switched reluctance machines, brshless DC motor Kind,

The polyphase machine winding and can be divided exactly around radical by the number (i+j) of the polyphase windings unit,

The winding number of phases of the polyphase machine winding and the polyphase windings unit, winding phase sequence, umber of turn, winding connection side Formula is identical with rated voltage.

4. motor-driven control device according to claim 1, it is characterised in that：

Wherein, the dc source is battery pack or rectifier power source.

5. motor-driven control device according to claim 1, it is characterised in that：

Wherein, the power conversion unit be made up of at least one SPM or comprising multiple types and parameter Identical power switch pipe,

The power switch pipe is electric power field-effect transistor, gate level turn-off thyristor, integrated gate commutated thyristor, insulation Any one in grid bipolar transistor, electric power bipolar transistor and door pole stream-exchanging thyristor.

6. a kind of electric drive system, is arranged in electrical equipment, for driving the electrical equipment, it is characterised in that including：

Polyphase machine, there is rated line voltage and specified line current, have (i+j) it is individual independently of each other and parameter identical multiphase around Group unit；And

Motor-driven control device, for driving the polyphase machine,

Wherein, the motor-driven control device is motor-driven control device according to any one of claims 1 to 5,

The j is the positive integer more than 1, and the i is 1.

A kind of 7. electrical equipment, it is characterised in that including：

Electric drive system described in claim 6.