Motor control device and electric power steering device

A motor control and motor technology, which is applied in the field of electric power steering devices, can solve the problems of a larger occupied area of ​​a substrate, a complicated circuit pattern, an increase in the size of the substrate, etc., and achieve the effect of suppressing torque fluctuations

Inactive Publication Date: 2010-12-08
JTEKT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, if the wiring pattern is formed so as to sufficiently reduce the torque ripple, the circuit pattern in the above-mentioned motor drive circuit board becomes complicated, and the space for forming the circuit pattern increases.
That is, in the motor drive circuit board, although the wiring pattern can be designed so that the wiring resistance of the path from the power supply terminal to the ground terminal is consistent between phases, it is difficult to achieve a sufficient reduction in the wiring resistance so that it does not affect the motor drive. degree, the switching elements constituting the motor drive circuit are arranged symmetrically
Therefor

Method used

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  • Motor control device and electric power steering device
  • Motor control device and electric power steering device
  • Motor control device and electric power steering device

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0115] figure 2 It is a block diagram showing the configuration of the motor control device according to the first embodiment of the present invention. figure 2 The shown motor control device is configured using an ECU 10 and drives a brushless motor 1 having three-phase windings (not shown) of u-phase, v-phase, and w-phase. The ECU 10 includes a phase compensator 11 , a microcomputer 20 , a 3-phase / PWM (Pulse Width Modulation, pulse width modulation) modulator 12 , a motor drive circuit 13 , and a current sensor 14 .

[0116] The steering torque T output from the torque sensor 3 , the vehicle speed S output from the vehicle speed sensor 4 , and the rotational position P output from the position detection sensor 5 are input to the ECU 10 . The phase compensator 11 performs phase compensation for the steering torque T. The microcomputer 20 functions as a control unit for obtaining a voltage command value used for driving the brushless motor 1 . Details of the functions of ...

no. 2 approach

[0196] Figure 8 It is a block diagram showing the configuration of a motor control device according to a second embodiment of the present invention. In the motor control device of the present embodiment, the microcomputer 20 and the current sensor 14 are replaced with the microcomputer 30 and the current sensor 15 in the motor control device of the first embodiment. This motor control device performs feedback control when the current sensor 15 is operating normally, and performs open-loop control when the current sensor 15 fails.

[0197] One current sensor 15 is provided on each of the paths through which the three-phase drive currents supplied to the brushless motor 1 flow, and detects the three-phase drive currents. The current values ​​of the three phases detected by the current sensor 15 (hereinafter referred to as u-phase current detection value i u , V-phase current detection value i v And w-phase current detection value i w ) is input to the microcomputer 30.

[...

no. 3 approach

[0222] refer to Figure 9 to Figure 11 Next, a motor control device according to a third embodiment of the present invention will be described.

[0223] Among them, the main difference between the third embodiment and the first embodiment is as follows: Instead of the data acquisition unit 41, the correction coefficient determination unit 42, and the correction execution unit 43 of the first embodiment, the phase current calculation unit 141 is implemented by a microcomputer. , the storage unit 142 , the phase resistance calculation unit 143 and the functions of the correction unit 144 . In the following description, the same reference numerals are assigned to the same configurations as those of the first embodiment, and description thereof will be omitted.

[0224] In the present embodiment, the current sensor 14 and the phase current calculation unit 41 described later are configured to detect the current I of the u-phase, v-phase, and w-phase of the brushless motor 1 . u ...

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PUM

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Abstract

A motor control device includes control calculation means formed by an open loop control unit and a dq-axis/3-phase conversion unit. The open loop control unit obtains voltage instruction values vd, vq on the d-axis and q-axis according to current instruction values id*, iq* on the d-axis and q-axis, the armature winding interlinking magnetic flux quantity f, and the rotor angular velocity omega e in the motor. The dq-axis/3-phase conversion unit converts the voltage instruction values vd, vq into phase voltage instruction values Vu, Vv, Vw. On the other hand, a data acquisition unit acquires angle-dependency data indicating dependency on the electric angle indicated by a secondary higher harmonic component concerning the electric angle of the d-axis or the q-axis component of the motor current according to the current detection value ia and the electric angle theta. A correction coefficient decision unit decides a correction coefficient for correcting the phase voltage instruction value so as to reduce the dependency according to the angle-dependency data. A correction execution unit corrects the phase voltage instruction values Vu, Vv, Vw obtained by the dq-axis/3-phase conversion unit, according to the decided correction coefficient.

Description

technical field [0001] The present invention relates to a motor control device for driving a brushless motor and an electric power steering device having such a motor control device. Background technique [0002] Conventionally, an electric power steering apparatus is used in which an electric motor is driven in accordance with a steering torque applied by a driver to a handle (steering wheel) to impart steering assist force to a steering mechanism of a vehicle. Conventionally, brushed motors have been widely used as electric motors for electric power steering devices, but in recent years, brushless motors have also been used from the viewpoint of improvement in reliability and durability, reduction in inertia, and the like. [0003] In general, a motor control device detects a current flowing through the motor in order to control torque generated in the motor, and performs PI control (proportional-integral control) based on the difference between the current to be supplied ...

Claims

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Application Information

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IPC IPC(8): H02P6/10B62D5/04B62D6/00H02P21/00H02P27/04B62D101/00B62D119/00
CPCB62D5/0463H02P21/06B62D5/046H02P6/10H02P21/00
Inventor 上田武史内田修弘吉田航也
Owner JTEKT CORP
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