CN100409560C

CN100409560C - Efficiency optimization control for permanent magnet motor drive

Info

Publication number: CN100409560C
Application number: CNB2003801106747A
Authority: CN
Inventors: 埃迪·英贤·何
Original assignee: International Rectifier Corp USA
Current assignee: Infineon science and technology Americas
Priority date: 2003-11-10
Filing date: 2003-11-10
Publication date: 2008-08-06
Anticipated expiration: 2023-11-10
Also published as: JP2007521787A; EP1685644A1; CN1879289A; AU2003290693A1; EP1685644A4

Abstract

The present invention relates to a system and a method for adjusting an estimated rotor angle to improve the efficiency of a PMSM driving system. A module is used for monitoring a running instruction, a torque instruction and an estimated speed and then responds to the running instruction, the torque instruction and the estimated speed to generate an output correction angle for adjusting the estimated rotor angle. The output correction angle can be added into the estimated rotor angle. The output correction angle can be generated only when the running instruction, the torque instruction and the estimated speed reach predetermined conditions. The output correction angle can also be generated particularly under the conditions that the running instruction is sent out; the torque instruction is higher than the predetermined level; the speed change is within the predetermined range.

Description

Be used for the efficiency optimization control that magneto drives

Technical field

The present invention relates to motor-driven, the particularly a kind of motor-driven of rotor angle estimation to raise the efficiency with improvement.

Background technology

Most low-cost motor driven systems adopt the control technology of encoderless (no transducer).For example, detect according to motor mode or counter electromotive force of motor and estimate rotor angle.If use inappropriate rotor angle to control permagnetic synchronous motor (PMSM), then the torque performance of electric efficiency and every ampere can significantly reduce.The rotor angle estimation error may be by the inaccurate generation in estimation device (angle) parameter or the counter electromotive force of motor detection feedback.

Fig. 2 shows with the motor power output of the magneto of the mounted on surface of rated current and speed operation and the figure of the ratio of rotor angle error.As shown in Figure 2, power output maximum when the rotor angle error is zero.

Known prioritization scheme is described in " the efficiency optimization control (Efficiency-Optimized Control of Medium-Size Induction Motor Drives) of medium-sized Induction Motor Drive " that people such as F.Abrahamsen deliver on IEEE/IAS commercial Application journal (IEEE/IAS Transactions on Industry Applications) the 6th phase (11/12 month calendar year 2001) the 37th volume to some extent in the background technology, and it is incorporated herein by reference.At pertinent literature that be incorporated herein by reference, energy technology institute of Aalborg University the energetic optimum of the Induction Motor Drive " control (EnergyOptimal Control of Induction Motor Drives) " in (in February, 2000), F.Abrahamsen has proposed to be used for several means with the variable speed drive induction machine, comprises the have pwm voltage type current transformer motor-driven of (voltage source inverter).

The converter that is used for the three phase electric machine driving is that industry is well-known.Typical DC bus provides switch power for the not homophase of AC motor.For the motor that adopts this control types, wish accurately estimation rotor angle (for example according to current feedback), with high-performance ground control motor.

The sequence number of submitting to November 12 in 2002 the inventor is 10/294, the sequence number that 201 application and on April 25th, 2003 submit to is 60/465, described the rotor angle evaluation method in the background technology in 890 the application, above-mentioned two applications are incorporated herein by reference.

Summary of the invention

The control system that the present invention relates to a kind of efficiency optimization control algolithm and use described algorithm, it can be applied to vector control permanent magnetism AC motor-driven, to improve efficiency of motor.Described efficiency optimization algorithm and system (utilizing control algolithm described here) adjust the rotor angle of estimation continuously, are issued to its minimum value up to torque instruction in limit.

According to the present invention, provide a kind of rotor angle of adjusting estimation to improve the system and method for the efficient in the PMSM drive system, it can may further comprise the steps: the speed of monitoring operating instruction, torque instruction and estimation; And, produce the output correction angle of the rotor angle that is used to adjust described estimation in response to the speed of described operating instruction, torque instruction and estimation.Described output correction angle can be added in the rotor angle of described estimation.Can only when reaching predetermined condition, described operating instruction, torque instruction and speed produce described output correction angle.Especially, can produce described output correction angle under following situation: (1) has sent described operating instruction, and (2) described torque instruction is higher than predeterminated level, and the variation of (3) described speed is positioned at predetermined scope.

By the description of embodiment of the present invention being carried out below in conjunction with accompanying drawing, other features and advantages of the present invention will be more readily apparent from.

Description of drawings

Fig. 1 is the block diagram that utilizes vector control motor driven systems of the present invention;

Fig. 2 shows the chart of the motor power output that is used for PMSM and the ratio of rotor angle estimation error;

Fig. 3 is the detailed diagram of efficiency optimization controller;

Fig. 4 shows a series of charts of the dry run of control from view of profit algorithm.

Embodiment

Fig. 1 shows the block diagram of the position of control from view of profit algoritic module 20 in vector control system 10.

Fig. 3 illustrates in greater detail the efficiency optimization control module.25 monitoring of efficiency optimization ON/OFF control module drive the motor speed and the torque instruction of operating instruction, estimation.If (1) sent operating instruction, (2) velocity variations (derivative of speed) is positioned at specific scope, and (3) current of electric (torque instruction) is higher than specified level, and then switch SW 1 will be triggered.If any one does not satisfy in above-mentioned three conditions, then export correction angle (D_Ang) with vanishing (10 seconds).

Torque differences module 30 is calculated poor (the current sample and poor between the sample) before in average (by 10 radian per second filtering) command torque.Search Control module 35 is determined the state of SW2 according to the symbol of D_Trq.If torque differences (D_Trq) is equal to, or greater than zero, then switch SW 2 is transition status, otherwise SW2 will keep its original state (not producing action).Gain K1 is used for the conditioning controller response, and constant A provides the exciting test signal to be used to search for minimized level of torque.

Can the off line predicted power with angular error the feature of ratio (Fig. 2).Thereby can be according to power (torque) sensitivity and rotor angle error recently represent K1 and A.

Fig. 4 shows the dry run of control from view of profit algorithm.In described dry run, used the magneto of the mounted on surface of Driven Compressor load.Adopted the initial rotor angle error of 0.5 radian.When efficiency optimization control started (time=1.8 second), angular error was corrected, and every ampere the driving torque (Te among Fig. 4 that improves ^*Reduce).Because the big or small and instruction level of torque of current of electric is proportional, so current of electric also is lowered.

Definition:

D_Trq-poor through between the command torque (sample current and before) of filtering

The angle output (radian) of D_Ang-efficiency optimization controller

Te ^*-torque instruction (N-M)

Te-motor torque (N-M)

Load-compressor load

The angle of Ang_Error-estimation and the differential seat angle (radian) between the actual rotor angle

Though invention has been described according to specific embodiment at this, in the technical staff, various other variation and modification and other application are conspicuous for ability.Therefore the present invention is not subjected to specific disclosed restriction in the specification.

Claims

1. a rotor angle of adjusting estimation may further comprise the steps to improve the method for the efficient in the PMSM drive system:

The speed of monitoring operating instruction, torque instruction and estimation; And

In response to the speed of described operating instruction, torque instruction and estimation, produce the output correction angle of the rotor angle be used to adjust described estimation.

2. the method for claim 1, wherein described output correction angle is added in the rotor angle of described estimation.

3. the method for claim 1, wherein only when reaching predetermined condition, described operating instruction, torque instruction and speed produces described output correction angle.

4. method as claimed in claim 3, wherein, produce described output correction angle under following situation: (1) has sent described operating instruction, and (2) described torque instruction is higher than predeterminated level, and the variation of (3) described speed is positioned at predetermined scope.

5. motor driven systems, wherein, the rotor angle of estimation is adjusted to improve the efficient in the PMSM drive system, and described motor driven systems comprises:

The module of the rotor angle of estimation motor; And

Monitor the speed of operating instruction, torque instruction and the estimation of described motor, and produce the module of output correction angle in response to the speed of described operating instruction, torque instruction and estimation, described output correction angle is used to adjust the rotor angle of described estimation.

6. system as claimed in claim 5, wherein, described output correction angle is added in the rotor angle of described estimation.

7. system as claimed in claim 5 wherein, only produces described output correction angle when described operating instruction, torque instruction and speed reach predetermined condition.

8. system as claimed in claim 7, wherein, produce described output correction angle under following situation: (1) has sent described operating instruction, and (2) described torque instruction is higher than predeterminated level, and the variation of (3) described speed is positioned at predetermined scope.