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Motor drive device

A motor drive and current technology, applied in the direction of controlling electromechanical transmission, motor control, generator control, etc., can solve problems such as failure to detect conduction faults

Inactive Publication Date: 2011-04-20
OMRON AUTOMOTIVE ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0027] As above, when using one current detection resistor R to detect the motor current at two timings of normal current detection (1) and (2), as Figure 17 As shown in the thick frame of , there are cases where the conduction failure (upper short circuit) of the upper switching element Q1 of the largest phase (U phase) and the conduction failure (lower short circuit) of the lower switching element Q6 of the smallest phase (W phase) cannot be detected. question

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Embodiment Construction

[0069] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The circuit structure of the motor drive device and Figure 14 Same as shown. Therefore, in the following, citing Figure 14 As an embodiment of the present invention. Also, since it has been stated Figure 14 , so detailed descriptions are omitted here.

[0070] figure 1 with Figure 14 The corresponding relationship is as follows. figure 1 The drive unit 101 with Figure 14 The switch circuit 2 corresponds. figure 1 The control section 102 contains with Figure 14 Corresponds to a part of the circuit of the driver IC3, CPU4, and amplifier circuit 5. figure 1 The respective functions of the upper stage abnormality judging unit 103 during regeneration and the lower stage abnormality judging part 104 are determined by Figure 14 The CPU4 has.

[0071] Next, the detection of the motor current and the detection of the conduction failure of the switching element in t...

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Abstract

This invention provides a motor drive device capable of detecting an ON fault of upper stage switching elements and lower stage switching elements for all of phases even when using a single current detection unit. A control unit (102) for outputting a PWM signal to a drive unit (101) includes an upper stage regeneration abnormality determination unit (103) and a lower stage regeneration abnormality unit (104). The upper stage regeneration abnormality unit (103) determines that ON fault occurred in at least one of lower stage switching elements (Q2, Q4, Q6) when current flowed to a current detection resistor (R) in an upper stage regeneration state in which upper stage switching elements (Q1, Q3, Q5) are all in an ON state. The lower stage regeneration abnormality unit (104) determines that ON fault occurred in at least one of upper stage switching elements (Q1, Q3, Q5) when current flowed to the current detection resistor (R) in a lower stage regeneration state in which lower stage switching elements (Q2, Q4, Q6) are all in the ON state.

Description

technical field [0001] The present invention relates to a motor drive device using a PWM (Pulse Width Modulation: Pulse Width Modulation) control system, and more particularly to a motor drive device that detects the current value of each phase using a single current detection means. Background technique [0002] In an electric power steering (power steering) device of a vehicle, an electric motor such as a three-phase brushless motor is provided in order to provide a steering assist force corresponding to a steering torque of a steering wheel to a steering mechanism. As a device for driving this motor, a motor drive device based on a PWM control method is known (for example, Patent Document 1). [0003] In the motor drive device of the PWM control system, three sets of upper and lower pairs of arms having switching elements on the upper arm and the lower arm are provided. In addition, the target value of the current that should flow through the motor is calculated from the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/08H02P21/36H02P27/06H02P29/00
CPCH02P29/021H02P27/08H02M2001/0009H02M1/32H02P29/0241H02M1/0009
Inventor 鞍谷真一中村健信薮口教定滨崎真充
Owner OMRON AUTOMOTIVE ELECTRONICS CO LTD