Motor driving apparatus

A driving device and motor technology, applied in the direction of control of electromechanical transmission, motor generator control, AC motor control, etc., can solve the problems of no contribution, low efficiency, decreased efficiency, etc., and achieve the effect of further stabilizing the weak magnetic field control

Active Publication Date: 2005-01-26
III HLDG 7
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the vector diagram and equation (5) shown in Fig. 11(b), it can be clearly seen that the terminal voltage V becomes lower as the field-weakening current Id flows because a current that does not contribute to torque generation is generated Id, which causes a decrease in efficiency

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0105] figure 1 It is a block diagram for explaining the motor drive device according to Embodiment 1 of the present invention.

[0106] The motor driving device 100a of the first embodiment takes the voltage source 1 as an input and drives the brushless motor 2 at any required number of revolutions. A change occurs to perform field weakening control of the brushless motor 2 .

[0107] In Embodiment 1, the motor current lead angle value β is controlled so that the deviation between the commanded rotation speed and the actual rotation speed of the motor becomes zero. In the prior art, the control object in the field weakening control is the field weakening current Id, so in the field weakening control, the lead angle value β of the motor current in Embodiment 1 and the field weakening current shown in the prior art Id is almost the same control object.

[0108] Next, the inverter circuit 3 and the inverter control unit 4a constituting the motor drive device 100a will be desc...

Embodiment approach 2

[0144] image 3 It is a block diagram for explaining the motor drive device according to Embodiment 2 of the present invention.

[0145] The motor drive device 100b of the second embodiment is the same as the motor drive device 100a of the first embodiment. The voltage source 1 is used as an input to drive the brushless motor 2 at an arbitrary number of revolutions. By adjusting the lead angle value β of the motor current, the brushless motor 2 Carry out weak magnetic field control. Furthermore, in Embodiment 2, the lead angle value β of the motor current is controlled while maintaining the amplitude value of the current supplied to the motor at a constant value so that o The deviation from the actual number of revolutions f can become zero.

[0146] That is, the motor drive device 100b is composed of an inverter circuit 3 that converts the voltage output from the voltage source 1 into a three-phase AC and outputs it to the motor 2, and an inverter control unit 4b that contr...

Embodiment approach 3

[0163] Figure 5 It is a block diagram for explaining the motor drive device according to Embodiment 3.

[0164] The motor drive device 100c of the third embodiment is the same as the motor drive device 100b of the second embodiment. The voltage source 1 is used as an input to drive the brushless motor 2 at an arbitrary number of rotations. By adjusting the actual number of rotations f of the motor to the maximum The motor current leading angle value β performs field weakening control on the brushless motor 2 .

[0165] That is, the motor drive device 100c is composed of an inverter circuit 3 that converts the output voltage of the voltage source 1 into three-phase alternating current and outputs it to the motor, and an inverter control unit 4c that controls the inverter circuit 3 .

[0166] The inverter control part 4c provides the drive signal Sg to the inverter circuit 3 so that the user can drive the brushless motor 2 with a desired number of revolutions. The command cur...

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Abstract

The invention carries out field weakening control on a brushless motor without use of preset controlled variables, such as table values, and independently of the input voltage of an inverter circuit 3 in a motor driving device that drives the brushless motor. The motor driving device comprises an inverter circuit 3 that converts the output voltage of a voltage source 1 into a three-phase alternating current, and outputs it to a motor 2; a rotor position estimating unit 5 that estimates the rotor position of the brushless motor; and an inverter control unit 4a that controls the inverter circuit 3 so that the brushless motor is driven by a current based on the estimated rotor position. The inverter control unit 4a determines a value [beta] of advance angle, which is the advance angle of a current supplied to the brushless motor relative to the estimated rotor position, so that the difference between commanded number of revolutions fo and actual number of revolutions f is minimized.

Description

technical field [0001] The present invention relates to a motor driving device, in particular to a motor driving device using an inverter circuit to drive and control a brushless motor. Background technique [0002] The brushless motor generates counter electromotive force ωE (E: magnetomotive force (main magnetic flux) of a permanent magnet for a magnetic field, ω: shaft angular velocity of the motor) due to its operation. Therefore, an equivalent circuit corresponding to the brushless motor 1 can be represented as shown in FIG. 11( a ). [0003] In Figure 11(a), R is the primary resistance of each phase of the brushless motor, L is the inductance of each phase of the brushless motor, I is the primary current (phase current) of the brushless motor, and V is the terminal applied to the motor Voltage. [0004] When the brushless motor is driven by an inverter circuit, the value obtained by multiplying the voltage conversion ratio (output voltage / input voltage<1) of the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/06H02P6/06H02P6/08H02P6/15H02P6/18H02P6/182H02P6/28H02P21/14
CPCH02P21/0089H02P6/182H02P6/142H02P6/15F25D11/027F25D29/005F25D2331/803
Inventor 植田光男中田秀树
Owner III HLDG 7
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