Motor control circuit, motor system, and motor control method

A motor control and circuit technology, applied in the direction of control system, motor generator control, electrical components, etc.

Inactive Publication Date: 2010-03-24
ASAHI KASEI ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the braking force depends on the counter electromotive force voltage, the braking f...

Method used

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  • Motor control circuit, motor system, and motor control method
  • Motor control circuit, motor system, and motor control method
  • Motor control circuit, motor system, and motor control method

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Embodiment Construction

[0051] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each figure referred in the following description, the same code|symbol is used for the same part as another figure.

[0052] (Structure of motor control circuit)

[0053] figure 1 It is a block diagram showing a configuration example of a motor control circuit according to an embodiment of the present invention. As shown in the figure, a rotor position detection circuit 1 is provided, which outputs a rotor position detection signal HALL based on a detection magnetic field detected by a magnetic sensor such as a Hall element HE; and a brake control circuit 2, which outputs a rotor position detection signal based on the rotor position detection signal. HALL to monitor the speed of the motor, and output the brake control signal SPSB for controlling short-pulse reverse braking and short-circuit braking; H-type bridge circuit 3, which drives the motor accor...

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Abstract

Provided is a motor control circuit for controlling the energization of a coil on the basis of the detection result of the position of a rotor. The motor control circuit performs controls to make a stop for a short time by suppressing continuous rotations by inertia and to cause no reverse rotation. When an external control signal (CTL) changes from L to H, a steady rotation control changes to a reversing control so that a reversing brake state comes in. The rotating speed of the motor is monitored, and when the rotating speed attenuates to a set rotating speed, a brake control signal (SPSB) changes from L to H so that a short brake state comes in. However, the motor is caused to continue rotations by inertia, and a position detecting signal (HALL) changes, so that the reversing brake control is performed temporarily (for a time period corresponding to a pulse width (TRB)). This short-pulse reversing brake control is interruptedly performed till the motor stops completely. Thus, the stop can be done for a shorter time period than in the case in which the stop is done only by the short brake control after the motor was decelerated to a rotating speed just before the stop.

Description

technical field [0001] The present invention relates to a motor control circuit, a motor system, and a motor control method for controlling a motor by energizing a motor coil. Background technique [0002] As a method of electrically braking the motor being driven, there are the following control methods: reverse braking control, which conducts electrical braking by applying current to the coil of the motor in the opposite direction to that of forward rotation; and short-circuit braking control , short-circuit the coil ends to perform electrical braking with a current flowing through the back-EMF voltage, which is generated by the magnetic field of the rotor and the coils of the stator (in the case of the inner rotor type , the voltage generated by the magnetic field of the stator and the coils of the rotor). [0003] Figure 11 Changes in the rotational speed when electric braking in the conventional control system is performed are shown. The dotted line S11 indicates the...

Claims

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Application Information

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IPC IPC(8): H02P6/24H02P3/18
CPCH02P3/18H02P6/24
Inventor 福岛贵志
Owner ASAHI KASEI ELECTRONICS CO LTD
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