Motor driving circuit

A motor drive and motor technology, applied in the field of motor drive circuits, can solve the problems of not being able to effectively reduce the motor drive noise, and not directly controlling the motor output current, so as to achieve the effect of reducing the motor drive noise

Inactive Publication Date: 2008-11-19
RENESAS ELECTRONICS CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the above configuration, the traditional motor drive circuit does not directly control the output current of the motor. Once the induced voltage constant and the number of revolutions of the motor change, the waveform of the output current of the motor changes accordingly, which cannot effectively reduce the noise of the motor drive.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Fig. 1 is a block diagram showing the structure of a motor drive circuit according to Embodiment 1 of the present invention. figure 2 is a circuit diagram showing the configuration of the current control circuit of the first embodiment. image 3 It is a circuit diagram showing the configuration of a U-phase output current generating section used in the current control circuit of the first embodiment. The torque command circuit 1 (current control means) controls the current control circuit 2 (current control means) using the torque signal I1. For example, the current control circuit 2 composed of a DA converter generates a reference value INREF for generation and control of the three-phase output currents IOUTU, IOUTV, and IOUTW for driving the motor 7, and current control command values ​​INU, INV, and INW (current control command signal).

[0034] The torque direction switching circuit 3, according to the torque command signal output from the torque command circuit 1...

Embodiment 2

[0074] Fig. 10 is a block diagram showing the structure of a motor drive circuit according to Embodiment 2 of the present invention. Components that are the same as or correspond to those shown in FIG. 1 are denoted by the same symbols, and description thereof will be omitted. The motor drive circuit shown in FIG. 10 further includes resistors R30u, R30v, and R30w for detecting output currents IOUTU, IOUTV, and IOUTW of U, V, and W phases, respectively, on the circuit shown in FIG. 1 .

[0075] Resistor R30u is inserted into the connecting part of the first output transistor 6u1 and the second output transistor 6u2, that is, between the output part of the output current IOUTU and the terminal U of the motor 7, and the voltage across the resistor R30u is connected so as to pass through the current detection circuit 4 resistors R1, R2 and comparators 4u1, 4u2 detection. The resistor R30v is inserted between the output portion of the output current IOUTV connected to the first o...

Embodiment 3

[0082] Fig. 11 is a block diagram showing the structure of a motor drive circuit according to Embodiment 3 of the present invention. Components that are the same as or corresponding to those in the motor drive circuit shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. The motor drive circuit shown in FIG. 11 is equipped with a position detection circuit 20 (position detection unit) instead of the induced voltage detection circuit 9 and the starting current detection circuit 8 shown in FIG. unit). The position detection circuit 20 detects the rotor position of the motor 7 based on the voltage waveform output from the Hall element 21 . The detection result is output from the position detection circuit 20 and input to the rotation speed detection / phase detection circuit 10, and based on the detection result, a zero-crossing signal BCOMP is generated.

[0083] Next, the operation will be described.

[0084] Fig. 12 is a timing c...

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PUM

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Abstract

To significantly reduce driving noise of a spindle motor, and realize the high efficiency of the motor drive. A revolution detection / phase detection circuit 10 and an output matrix circuit 11 generate a plurality of control signals SSU, SSV, and SSW on the basis of detection results of an induced voltage detection circuit 9 in the motor drive circuit. A current control circuit 2 generates current control command values INU, INV, and INW based on it. A current detection circuit 4 detects the output current driving the motor. An output transistor 6 is controlled by the current detection circuit 4 on the basis of the detection result and the current control command values INU, INV, and INW.

Description

technical field [0001] The present invention relates to a motor drive circuit for driving a spindle motor used in a hard disk drive, an optical disc drive, and a fan motor with low noise and high efficiency. Background technique [0002] The conventional motor drive circuit is constructed in such a way that when driving the three-phase brushless spindle motor, the commutation control circuit that switches the energization mode of the three-phase output current does not switch the energization mode instantaneously, but detects the electrical angle interval detection circuit. In a certain electrical angle interval, switch slowly. The electrical angle interval detection circuit detects the period of slowly switching the energization mode according to the signal indicating the crossover of each induced voltage of the motor detected by the induced voltage detection circuit and the motor midpoint voltage, and notifies the commutation selection of the commutation control circuit du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/10H02P6/08H02P6/06H02P6/18H02P6/182
CPCH02P6/085H02P6/14H02P6/182H02P2209/07H02P6/18
Inventor 日下智铃木稔也鸣海聪玉川浩之帆足正治
Owner RENESAS ELECTRONICS CORP
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