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Motor control equipment

A technology of motor control and motor, which is applied in the direction of control system, motor control, excitation or armature current control, etc. It can solve the problems of temperature surge inside the PWM control module, reduce the reliability of the protection motor control equipment, etc., and achieve the goal of improving reliability. Effect

Inactive Publication Date: 2004-10-20
DENSO CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the delay occurs, the internal temperature of the PWM control module may increase sharply due to the layer short circuit of the fan motor or other reasons.
Failure to handle this surge in temperature reduces the reliability of the operation to protect the motor control equipment and motor from damage

Method used

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Examples

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no. 1 example

[0023] The present invention will be described in detail with reference to various embodiments in which the motor control apparatus is applied to an electrically driven fan system for an automobile engine cooling apparatus.

[0024] refer to figure 1 , the DC motor 1 acts as a driver for a low-pressure air compressor fan (not shown) for cooling engine cooling refrigerant flowing through a heat exchanger such as a radiator. The motor control device 2 controls the rotation speed of the motor 1 . The battery 3 supplies power to the motor control device 2 through an ignition switch (not shown). It is worth noting that in some configurations, the battery 3 directly supplies power to the motor control device 2 .

[0025] The voltage supplied to the motor 1 determines the rotational speed of the low pressure air compressor fan. The motor control device 2 adjusts the level of voltage by employing a pulse width modulation (PWM) control method that applies switching of the output of ...

no. 2 example

[0097] exist Figure 6 The second embodiment shown in is basically the same as figure 1 The same as the first embodiment shown in . However, in the second embodiment, the resistor 100 is connected between the negative terminal of the motor 1 and the connection point between the MOSFET 5 and the freewheeling diode 7 . In addition, the voltage appearing across the ends of the resistor 100 is supplied to the overcurrent protection circuit 13 .

[0098] exist Figure 7 In the overcurrent protection circuit 13 shown, the motor current IM is taken as the current voltage ( Figure 8 S3) in the detection. The overcurrent protection circuit 13 includes a low-end overcurrent detection threshold voltage setting circuit 140 for setting a low-end overcurrent detection threshold voltage Va( Figure 8 in S1). The low-side judgment comparator 150 compares the low-side overcurrent detection threshold voltage Va output by the low-side overcurrent detection threshold voltage setting circui...

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PUM

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Abstract

In a control apparatus for a motor, an over-current protection circuit detects an abnormality in a motor current forcibly turns off a MOSFET. The over-current protection circuit has a timer function and a time switching function. In the timer operation, the over-current protection circuit stops an abnormality detection signal for an ON time period before producing the signal for an OFF time period when a current flowing through the motor exceeds a predetermined threshold value. The time switching function is for controlling to lengthen the OFF time period to a relatively larger value in comparison with the ON time period.

Description

technical field [0001] The present invention relates to a motor control device for controlling a motor current by turning on and off a semiconductor switching device. Background technique [0002] In order to reduce noise and power consumption in an apparatus for controlling a fan motor used in an engine cooling system in an automobile, for example, pulse width modulation (PWM) is used to perform Continuous or proportional control. When excessive current occurs due to the rotation-locked state of the fan motor or a short circuit, the heat it causes is likely to damage the semiconductor switching device in the PWM control module. [0003] Therefore, as a general solution, an overcurrent protection circuit capable of handling such excessive current is provided. When the semiconductor switching device is actually placed in a continuous cut-off state after detecting an excessive current, however, the fan motor is also in fact stopped, which has a negative effect on cooling the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P7/29H02H7/08H02H7/085H02P7/291
CPCH02P29/02H02H7/0858H02H7/0833
Inventor 野村学吉村聪史
Owner DENSO CORP
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