Motor controller and steering device

A technology of motor controller and motor, which is applied in the direction of controlling electromechanical brakes, control systems, steering mechanisms, etc., and can solve problems such as driver discomfort

Inactive Publication Date: 2008-07-09
DENSO CORP
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Furthermore, when the motor disclosed in Patent Document 2 is driven by using the above-mentioned motor controller, torque variation occurs in the motor due to the above-mentioned reason, and this torque variation is transmitted to the steering wheel, giving the driver an uncomfortable feeling

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Motor controller and steering device
  • Motor controller and steering device
  • Motor controller and steering device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0046] The first embodiment will be described with reference to the drawings. figure 1 is a block diagram showing the structure of the steering device. FIG. 2 is a block diagram showing the structure of a motor controller for an electric motor (referred to as a motor) applied to a steering apparatus. In this embodiment, a steering apparatus having a transmission ratio changing mechanism for changing a rotational transmission ratio between a steering angle of a steering wheel and a turning angle of steered wheels according to a vehicle speed will be described as a steering apparatus. For example, the rotational transmission ratio of the transmission ratio changing mechanism is controlled by the steering device so that when the vehicle stops or moves at a low speed, the turning angle of the steering wheel is larger than that of the steering wheel, thereby reducing the amount of manipulation of the steering wheel by the driver. On the other hand, when the vehicle is moving at hi...

no. 2 example

[0114] A second embodiment will be described. In this embodiment, the converter 30 is constructed of MOSFETs ( T1 , T2 , T3 , T4 , T5 , T6 ) having electrical characteristic values ​​within a predetermined range.

[0115] MOSFETs (T1, T2, T3, T4, T5, T6) are divided into a plurality of groups in which the range of the threshold voltage Vth of the MOSFET or the range of the parasitic capacitance C of the MOSFET is different, and the converter 30 is composed of MOSFET (T1, T2, T3, T4, T5, T6) to construct. Therefore, variation in electrical characteristic values ​​of MOSFETs ( T1 , T2 , T3 , T4 , T5 , T6 ) constituting inverter 30 can be suppressed, and waveforms of respective phases generated by inverter 30 can be made to coincide with each other, so that switching can be suppressed. The surge of the torque current Iq can be suppressed, and the torque variation of the motor 5 can be suppressed.

[0116] Grouping of MOSFETs ( T1 , T2 , T3 , T4 , T5 , T6 ) based on any one of t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A correction unit calculates a correction amount so that sine waves of the respective phases are coincident with one another and changes a PWM signal for carrying out the PWM control on switching elements e.g. metal oxide semiconductor field effect transistors (MOSFETs) based on the computed correction amount. A storage unit is adapted to store the correction amount for each phase based on the detection result. The switching elements are subjected to pulse width modulation (PWM) control to generate sine waves of multiple phases. A motor (5) includes a stator coil that produces rotational magnetic field upon receiving sine waves, and a rotor that is driven by the action of the rotational magnetic field.

Description

technical field [0001] The technical field generally relates to a motor controller for control driven by an inverter, and a steering apparatus. Background technique [0002] JP-A-2002-10685 (Patent Document 1) discloses a prior art time compensation control for a motor driven by an inverter. The motor control device of this publication provides a compensation amount for a delay time occurring due to PWM control to a PWM signal for driving an inverter. According to this motor control apparatus, the delay time compensation gain is calculated by the torque amount calculated based on the torque current command value, whereby the calculated compensation gain is multiplied by the compensation amount described above to correct the PWM signal. Therefore, the PWM signal to be transmitted to the inverter can be stabilized, so that the current variation of the motor can be suppressed, and the torque variation of the motor can be suppressed. [0003] In addition to the above-mentioned...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityPatents(China)
IPC IPC(8): H02P27/06H02P21/00H02P21/05H02P23/04H02P25/022H02P25/03H02P27/08
CPCH02P21/05H02P6/10H02P27/08B62D5/046H02P27/085
Inventor日高研一郎平峰干大河合元史筒井敏雄宫田正浩小城隆博
OwnerDENSO CORP