JP2010263712A - Motor drive and motor drive system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor drive for transmitting a signal that indicates one of a plurality of failures detected to a host controller without increasing the number of wirings and connection terminals. <P>SOLUTION: The motor drive includes: a switching element for switching supply of power to a motor; a driver control section for switching ON/OFF of the switching element according to a command signal; a current measurement section for measuring a current value to be applied to the motor; a voltage measurement section for measuring a voltage value to be applied to the motor; a temperature measurement section for measuring an atmospheric temperature of the switching element; a determination processing section for comparing each measurement result of the current measurement section, the voltage measurement section, and the temperature measurement section with predetermined thresholds to detect a failure and for outputting a signal indicating the detected failure; and a failure signal output section for generating a failure signal according to the signal output by the determination processing section to output the failure signal by one output signal line. They are stored in one package. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a motor drive device and a motor drive system that detect a failure.

  A technique is disclosed in which a motor driving device that drives a motor detects a lock abnormality, which is one of motor abnormalities, and notifies a higher-level control device (Patent Document 1). Depending on the application in which the motor is used, it is necessary to detect other faults, for example, multiple faults such as overcurrent faults and overvoltage faults. When detecting a failure, the motor drive device transmits a signal indicating the detected failure to a host control device, for example, an ECU (Electric Control Unit). In order to identify the detected fault in the host controller, it is necessary to identify which fault has been detected from the received signal. Therefore, the wiring, the motor drive device, and the host controller for each fault type The number of connecting terminals to connect to the network has increased.

JP 2008-236946 A

  However, the increase in wiring and connection terminals for connecting the host control device and the motor driving device leads to an increase in the size of the socket for connecting the unit and the wiring for the host control device and the motor driving device, and the host control device. In addition, there is a problem that it is difficult to reduce the size of the unit that houses the motor drive device.

  The present invention has been made to solve the above problems, and its purpose is to provide a signal indicating which one of a plurality of faults has been detected without increasing wiring and connection terminals to the host controller. The object is to provide a motor drive device for transmission.

  (1) In order to solve the above problem, the present invention provides a motor drive device that drives a motor in response to a command signal indicating drive and braking of the motor input from a host control device. A switching element that switches whether or not to supply power, a driver control unit that switches on and off the switching element in response to the command signal, and a current measurement unit that measures a current value applied to the motor; A voltage measurement unit for measuring a voltage value to be applied to the motor, a temperature measurement unit for measuring an ambient temperature of the switching element, a measurement result of each of the current measurement unit, the voltage measurement unit, and the temperature measurement unit in advance. A failure detection is performed by comparing with a predetermined threshold, and a signal indicating the detected failure is output, and a failure signal is generated according to the signal output by the determination processor , Comprising a failure signal output unit for outputting the single output signal line the fault signal, the apparatus is a motor driving apparatus characterized by being accommodated in a single package.

  (2) Further, according to the present invention, in the invention described above, the failure signal output unit outputs an alternating signal having a different duty ratio according to a signal indicating the failure output from the determination processing unit as the failure signal. It is characterized by that.

  (3) Further, according to the present invention, in the invention described above, the failure signal output unit outputs a signal having a different potential as the failure signal according to a signal indicating the failure output by the determination processing unit. Features.

  (4) Further, in the present invention described above, the determination processing unit may output a signal indicating a failure having the highest priority among the detected failures based on a predetermined priority. It outputs to an output part, It is characterized by the above-mentioned.

  (5) Further, in the present invention described above, when the control unit detects that the command signal is not input, the switching element is turned on and off at a predetermined cycle. And switching between.

  (6) Further, in the present invention described above, is the determination processing unit configured to apply a current equal to or greater than a predetermined first threshold to the motor based on a current value measured by the current measurement unit? And detecting a switching failure of the switching element and a failure of disconnection from the motor as a load.

  (7) Further, according to the present invention, in the above-described invention, the determination processing unit is configured such that the voltage value applied to the motor from the voltage value measured by the voltage measuring unit is outside a predetermined voltage range. Is detected.

  (8) Further, according to the present invention, in the invention described above, the driver control unit is predetermined in the control unit when the ambient temperature measured by the temperature measurement unit is equal to or higher than a predetermined second threshold value. The switching element is switched on and off at different intervals.

  (9) Further, in the present invention described above, the determination processing unit may be configured such that the ambient temperature measured by the temperature measurement unit is higher than the second threshold and is equal to or higher than a predetermined third threshold. The switching element is turned off.

  (10) In the invention described above, the present invention is a motor drive system that is connected to a DC motor and includes the two motor drive devices described above and a control device. In the case of rotating the DC motor in the normal direction, the current is controlled to flow from one motor driving device to the other motor driving device through the motor out of the two motor driving devices, and the DC motor is rotated in the reverse direction. In the motor drive system, control is performed so that a current flows from one motor drive device to the other motor drive device through the motor.

  (11) In the invention described above, the present invention is a motor drive system that is connected to a three-phase brushless motor and includes the three motor drive devices described above and a control device. The apparatus outputs the command signal to each of the three motor driving devices in response to a command signal input from the host controller, and each of the three motor driving devices includes three coils included in the three-phase brushless motor. The driver control unit associated with each of the three motor driving devices switches on and off of the switching element according to a rotation angle of a rotor of the three-phase brushless motor. This is a motor drive system.

  According to the present invention, it is possible to transmit a signal indicating which one of a plurality of failures has been detected to a host control device without increasing the number of wirings and connection terminals.

It is a schematic block diagram which shows the structure of the motor drive system 1 and the motor drive device 10 in 1st Embodiment. It is a schematic block diagram which shows the structure of the motor drive system 5 and the motor drive device 10-1 in 2nd Embodiment.

  Hereinafter, a motor drive device and a motor drive system according to embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a schematic block diagram illustrating configurations of a motor drive system 1 and a motor drive device 10 according to the first embodiment. As shown in the figure, the motor drive system 1 is connected to a host control device 2, a battery 3, and a motor 4. In the present embodiment, the case where the motor 4 is a DC motor will be described.

The motor drive system 1 outputs electric power supplied from the battery 3 to the motor 4 in response to a command signal output from the host controller 2. Here, the command signal is a signal indicating driving or braking of the motor 4, and in the case of indicating driving, indicates the rotational speed of the rotor of the motor 4.
The motor 4 has two connection terminals to which electric power is input. One connection terminal is connected to the motor drive system 1 and the other connection terminal is grounded. Further, the motor 4 is provided with a magnetic threshold detector that detects a rotation angle indicating the position of the rotor of the motor 4, for example, a position detector 41 using a resolver and a Hall IC. The position detection unit 41 outputs a rotation angle indicating the position of the rotor of the motor 4 to the motor drive system 1 as position information.

The motor drive system 1 includes a coil 11 and a capacitor 12 that smooth the fluctuation of power supplied from the battery 3, and a motor drive that applies the power smoothed by the coil 11 and the capacitor 12 to the motor 4 according to a command signal. Device 10.
The motor drive device 10 includes a command signal interface 110, a driver control unit 120, switching elements 130 and 140, a temperature detection unit 150, a failure determination unit 160, and a failure signal output unit 170. In addition, the command signal interface 110, the driver control unit 120, the switching elements 130 and 140, the temperature detection unit 150, the failure determination unit 160, and the failure signal output unit 170 are resin-molded and placed in one package. It is stored.

  The command signal interface 110 is connected to the host controller 2 through a command signal line, and a command signal is input through the command signal line. The command signal is a signal having a frequency, and a frequency is assigned to each of driving and braking, which are operations of the motor 4, and a frequency is assigned to the rotational speed of the rotor when the motor 4 is driven as a frequency indicating the driving. ing. The command signal interface 110 detects the frequency of the input command signal, determines the operation of the motor 4 from the frequency, and outputs a signal indicating the operation of the motor 4 to the driver control unit 120. Here, for the frequency used for the command signal, for example, a frequency of 500 Hz or less is assigned in consideration of the distance between the host controller 2 and the command signal interface 110, noise received by the command signal, and the like.

  The driver control unit 120 controls driving and braking of the motor 4 according to a signal input from the command signal interface 110. In addition, when a signal indicating the rotation speed when driving the motor 4 is input from the command signal interface 110, the driver control unit 120 turns off the switching element 140, and the current value of the current applied to the motor 4; The switching element 130 is switched on and off according to the position information output by the position detection unit 41. Further, when a signal indicating braking is input from the command signal interface 110, the driver control unit 120 turns off the switching element 130, turns on the switching element 140, and shorts the connection terminal of the motor 4 for braking.

  The switching element 130 includes a field effect transistor (FET) 131 and a diode 132 as a parasitic diode included in the FET 131. The FET 131 has a drain connected to one end of the coil 11, a source connected to the switching element 140 via the connection point J <b> 1, and a gate connected to the driver control unit 120. The diode 132 has an anode connected to the source of the FET 131, a cathode connected to the drain of the FET 131, and is connected so that a reflux current flows.

  Similar to the switching element 130, the switching element 140 includes an FET 141 and a diode 142 as a parasitic diode included in the FET 141. The FET 131 has a drain connected to the source of the FET 131 via a connection point J1, a source grounded, and a gate connected to the driver control unit 120. The diode 142 has an anode connected to the source of the FET 141, a cathode connected to the drain of the FET 141, and is connected so that a reflux current flows.

  The connection point J <b> 1 is connected to one connection terminal of the motor 4. When the driver control unit 120 turns on the switching element 130 and turns off the switching element 140, that is, turns on the FET 131 and turns off the FET 141, the power supplied from the battery 3 is supplied to the motor 4. Driven. When the driver control unit 120 turns off the switching element 130 and turns on the switching element 140, the connection terminal of the motor 4 is short-circuited and the motor 4 is braked.

  Here, the driver control unit 120 calculates a voltage corresponding to the rotation speed in accordance with a signal indicating the rotation speed input from the command signal interface 110, and applies the calculated voltage to the motor 4 so as to apply the calculated voltage to the motor 4. The motor 4 is driven by PWM control for switching between on and off. At this time, the driver control unit 120 calculates the rotational speed calculated from the value of the current flowing in the motor 4 input from the failure determination unit 160 or the change amount of the position information of the rotor of the motor 4 output from the position detection unit 41, Alternatively, feedback control using both is performed.

  The temperature detection unit 150 is a voltage dividing circuit including a thermistor 151 connected in series between a control system power supply voltage VDD (for example, 5 [V]) and a ground (0 [V]) and a resistor 152. Yes, the output voltage changes according to the ambient temperature at the position where the thermistor 151 is disposed. Here, the thermistor 151 is disposed in the vicinity of the FET 131 of the switching element 130 and measures the ambient temperature of the FET 131.

The failure determination unit 160 includes a determination processing unit 161, a current measurement unit 162, a temperature measurement unit 163, and a voltage measurement unit 164.
The current measuring unit 162 is connected to each of the drain and source of the FET 131 of the switching element 130. When the FET 131 is on, the current applied to the FET 131, that is, the current applied to the motor 4 is measured by measuring the on-resistance of the FET 131. Is measured and output to the determination processing unit 161.

The temperature measurement unit 163 has a table in which the voltage output from the temperature detection unit and the junction temperature of the FET 131 are associated with each other, and the junction temperature of the FET 131 is calculated from the voltage output from the temperature detection unit 150 using the table. The estimated junction temperature is output to the determination processing unit 161. Here, the table included in the temperature measurement unit 163 includes the voltage output from the temperature detection unit 150 and the junction temperature based on the simulation result based on the arrangement relationship between the thermistor 151 and the FET 131, the surrounding heat conduction, or the measurement result. Is previously recorded.
The voltage measurement unit 164 is connected to the wiring between the coil 11 and the switching element 130, measures the voltage output from the battery 3, and outputs the measured voltage value to the determination processing unit 161.

  The determination processing unit 161 determines whether the current value measured by the current measurement unit 162 exceeds a predetermined threshold current value (first threshold), and the measured current value exceeds the threshold current value. If so, an overcurrent failure is detected on the assumption that an overcurrent is flowing in the motor 4. Here, the predetermined current value is a current obtained from a measurement or simulation of an actual machine, which may cause a failure of the motor driving device 10 and the motor 4, for example, damage to the FET 131, the winding of the motor 4, or the like. Value.

  Further, the determination processing unit 161 determines whether or not the junction temperature estimated by the temperature measurement unit 163 is equal to or higher than a predetermined first threshold temperature (second threshold), and the estimated junction temperature is the first threshold value. If over temperature, overheat fault is detected. Further, it is determined whether or not the estimated junction temperature is equal to or higher than a predetermined second threshold temperature (third threshold) higher than the first threshold temperature. The switching element 130 is turned off. As a result, the junction temperature of the FET 131 of the switching element 130 is further increased by switching, and the FET 131 is prevented from being destroyed. Here, the first threshold temperature is, for example, about 20 degrees lower than the absolute rated temperature of the FET 131, and the second threshold temperature is, for example, the absolute rated temperature of the FET 131.

In addition, the determination processing unit 161 determines whether or not the voltage value measured by the voltage measurement unit 164 is within a predetermined range, and when the measured voltage value is lower than the range, detects a low voltage failure, If the measured voltage value is higher than the range, an overvoltage fault is detected.
Further, the determination processing unit 161 is configured such that when the current measurement unit 162 cannot detect the current even though the FET 131 is turned on, the FET 131 is always in the off state, or the FET 131 is in an off state, or the motor drive device 10 supplies power to the motor 4. An output open failure, which is a failure that causes a disconnection of the wiring that supplies power, is detected.

  Further, the determination processing unit 161 outputs a signal indicating the detected failure to the failure signal output unit 170. When a plurality of failures are detected, the determination processing unit 161 outputs a signal indicating a failure with the highest priority among the detected failures to the failure signal output unit 170 according to a predetermined priority order. The priority order is determined in advance as, for example, an overheat fault, an overcurrent fault, an overvoltage fault, a low voltage fault, and an output open fault in descending order of priority.

  The failure signal output unit 170 generates a failure signal having a duty ratio associated with each detected failure, and outputs the generated failure signal to the host controller 2. For example, the duty ratio associated with the failure is pre-assigned 10%, 20%, 30%, 40%, 50% to each of the overcurrent failure, overheat failure, overvoltage failure, low voltage failure, and output open failure. Is not detected, a 55% duty ratio is pre-assigned.

With the configuration described above, in the motor drive device 10, a plurality of failures can be detected by the determination processing unit 161. By outputting a failure signal with a different duty ratio for each detected failure to the host control device 2, The device 2 can determine which failure has been detected by the motor driving device 10 among a plurality of failures. Even when a failure is not detected, a signal with a predetermined duty ratio (for example, 55%) continues to be output to the host controller 2, so that the connection line between the host controller 2 and the failure signal output unit 170 has some influence. In the case of disconnection or the like, a signal having a duty ratio of 0% or 100%, that is, an on or off signal is always input to the host controller 2, whereby the host controller 2 can detect a failure.
Further, since the motor drive device 10 is housed in one package, the temperature detection unit 150 is compared with the case where the temperature detection unit 150 is configured using discrete components on the substrate and the ambient temperature of the FET 131 is measured. Can be fixed to the FET 131 in the vicinity. Thereby, the error in the ambient temperature of the FET 131 due to the change in the position of the temperature measuring unit 150 can be reduced.

  Furthermore, since the current measurement unit 162 and the FET 131 are arranged in the vicinity by being housed in one package, the wiring connecting the current measurement unit 162 and the FET 131 is shortened, and in the measurement of the current flowing through the FET 131, Wiring resistance can be reduced. Further, since the motor driving device 10 is housed in one package, the temperature detection unit 150 and the FET 131 are fixed without moving compared to a case where the motor driving device 10 is configured using discrete components on a substrate. Thereby, compared with the case where it comprises on a board | substrate, the distance of the temperature measurement part 150 and FET131 is kept constant, and the error of temperature measurement can be decreased. Furthermore, since the motor driving device 10 is housed in one package, the current measurement unit 162 and the FET 131 are disposed in the vicinity, and the wiring is shortened, so that a current measurement error can be reduced.

  The current measuring unit 162 is configured to measure the current value of the current applied to the motor 4 from the on-resistance of the FET 131, but measures the current value of the current applied to the motor 4 using a shunt resistor. You may do it.

  Note that when the overheating failure is detected, the determination processing unit 161 may control the driver control unit 120 to switch the FET 131 on and off at a predetermined first period. When the driver control unit 120 generates heat by switching the FET 131 on and off at high speed in a cycle corresponding to the rotation speed instructed by the command signal, the driver control unit 120 turns on and off in the first cycle. By switching, the junction temperature of the FET 131 can be lowered. Thereby, it is possible to prevent the FET 131 from generating heat due to switching between ON and OFF at high speed and causing a failure. Here, the first cycle is, for example, a cycle calculated or measured in advance from the specifications of the FET 131 element itself and the configuration of the motor drive device 10, and the amount of heat generated when switching in the first cycle is around the FET 131. The period is smaller than the heat dissipation amount.

When the command signal interface 110 cannot detect the frequency from the input command signal, the command signal interface 110 detects the disconnection of the command signal line, and signals the disconnection of the command signal line to the host controller 2 via the failure signal output unit 170. May be transmitted.
Further, when the disconnection of the command signal line is detected, the command signal interface 110 outputs a predetermined rotational speed to the driver control unit 120 and drives the motor 4 at the rotational speed, that is, the FET 131 is predetermined. It is also possible to switch between on and off at different intervals. Thereby, for example, in a device that cools an object that generates heat by driving the motor 4 according to a command signal from the host control device 2, even if the disconnection of the command signal line occurs, the driving of the motor 4 is stopped. Cooling can be continued without any failure, and failure of the device due to overheating can be prevented.

  The failure signal output unit 170 is configured to output a failure signal with a variable duty ratio. However, the failure signal output unit 170 outputs a failure signal having a predetermined voltage according to the signal indicating the failure output from the failure determination unit 160. The failure may be identified by voltage transmitted to the control device 2.

  Note that the failure signal output unit 170 may generate a signal having a different frequency associated in advance for each failure detected by the failure determination unit 160 and transmit the signal to the host control device. In this case, when a plurality of failures are detected, the failure signal output unit 170 generates a failure signal obtained by combining a plurality of signals having different frequencies associated with each failure and adds them to the host controller 2. Send.

<Second Embodiment>
FIG. 2 is a schematic block diagram showing the configuration of the motor drive system 5 and the motor drive device 10-1 in the second embodiment. As shown in the figure, the motor drive system 1 is connected to a host control device 2, a battery 3, and a motor 4. In the present embodiment, the case where the motor 4 is a DC motor will be described as in the first embodiment. Moreover, since the motor drive devices 10-1 and 10-2 have the same configuration as the motor drive device 10 of the first embodiment, the corresponding portions are denoted by the same reference numerals, and the motor drive device 10- The description of 1, 10-2 is omitted.

The motor drive system 5 outputs the power supplied from the battery 3 to the motor 4 in response to the command signal output from the host controller 2. Here, the command signal is a signal indicating driving or braking of the motor 4, and in the case of driving, indicates the rotational speed and direction of the rotor of the motor 4. There are two directions of rotation: forward rotation and reverse rotation.
The motor 4 has two connection terminals to which electric power is input. The two connection terminals are connected to the motor drive system 5, and the drive is controlled by the motor drive system 5. Further, the motor 4 is provided with a position detection unit 41 that detects a rotation angle indicating the position of the rotor of the motor 4. The position detection unit 41 outputs a rotation angle indicating the position of the rotor of the motor 4 to the motor drive system 5 as position information.

The motor drive system 5 includes a coil 11, a capacitor 12, motor drive devices 10-1 and 10-2, and a control device 30.
The control device 30 outputs the command signal to one of the motor drive devices 10-1 and 10-2 according to the rotation direction (forward or reverse) of the rotor of the motor 4 indicated by the command signal, and A ground signal indicating that the connection terminal of the motor 4 is grounded is output. In addition, the control device 30 receives failure signals from the motor driving devices 10-1 and 10-2, synthesizes the inputted failure signals, and outputs the synthesized failure signals to the host control device 2. Electric power smoothed by the coil 11 and the capacitor 12 is input from the battery 3 to the motor driving devices 10-1 and 10-2. In addition, the motor driving devices 10-1 and 10-2 output the input power to the motor 4 in response to a command signal input from the host control device 2.

The control device 30 receives a command signal from the host control device 2 and outputs an auxiliary command signal to the motor drive devices 10-1 and 10-2, and the motor drive devices 10-1 and 10-2, respectively. And a failure signal synthesis unit 32 that outputs an integrated failure signal to the host controller 2.
Hereinafter, the operation of the integrated control unit 31 will be described in the case where the command signal indicates each of driving in the forward direction, driving in the reverse direction, and braking with respect to the motor 4.

  When the command signal indicates normal rotation driving of the motor 4, the integrated control unit 31 generates a sub-command signal indicating the same rotation speed as the rotation speed indicated by the command signal and outputs it to the motor driving device 10-1. Is output to the motor driving device 10-2. As a result, a circuit is formed in which the battery 3, the FET 131 of the motor driving device 10-1, the motor 4, and the FET 141 of the motor driving device 10-2 are connected in this order.

  When the command signal indicates reverse rotation driving of the motor 4, the integrated control unit 31 generates a sub-command signal indicating the same rotation speed as the rotation speed indicated by the command signal, and outputs the sub-command signal to the motor drive device 10-2. Is output to the motor driving device 10-1. As a result, a circuit is formed in which the battery 3, the FET 131 of the motor driving device 10-2, the motor 4, and the FET 141 of the motor driving device 10-1 are connected in this order.

When the command signal indicates braking of the motor 4, the integrated control unit 31 generates a sub-command signal indicating braking of the motor 4 and outputs it to the motor driving devices 10-1 and 10-2. Thereby, the two connection terminals of the motor 4 are short-circuited to be braked.
As described above, the integrated control unit 31 generates a sub-command signal in accordance with the drive in the forward direction, the drive in the reverse direction, and the braking with respect to the motor 4 indicated by the command signal to generate the motor drive device 10-. 1 and 10-2.

  The failure signal synthesizer 32 receives failure signals from the motor driving devices 10-1 and 10-2, synthesizes the inputted failure signals, generates an integrated failure signal, and outputs the integrated failure signal to the host controller 2. Further, when a failure signal is input from both of the motor drive devices 10-1 and 10-2, the failure signal synthesis unit 32 sends one of the failure signals to the host control device 2 in accordance with a predetermined priority order. Send.

  Further, the failure signal synthesis unit 32 changes the duty ratio assigned to the failure indicated by the failure signal input from the motor drive device 10-2. For example, 10%, 20%, 30%, 40%, and 50% of the overcurrent failure, overheat failure, overvoltage failure, undervoltage failure, and output open failure detected by the motor driving devices 10-1 and 10-2, respectively. When the duty ratio is assigned, the duty ratios of the overcurrent fault, overheat fault, overvoltage fault, undervoltage fault, and output open fault detected by the motor driving device 10-2 are 60%, 70%, 80%, Change to 90% or 100%. The failure signal synthesizer 32 outputs a signal with a duty ratio of 55% when no failure is detected in either the motor drive device 10-1 or the motor drive device 10-2. Accordingly, when a failure signal indicating failure detection is output from the motor drive devices 10-1 and 10-2, the host control device 2 determines that the failure detected by the motor drive device 10-1 and the motor drive device 10-2. Can be identified from the detected fault, and the detected fault can be identified.

  As described above, by using a combination of the two motor drive devices 10 of the first embodiment, drive control of the DC motor 4 in the forward direction and the reverse direction can be performed, and a failure signal is transmitted to the host control device 2. A signal indicating a failure detected by the motor driving devices 10-1 and 10-2 can be transmitted without increasing the number of wirings and connection terminals.

  When driving a three-phase brushless motor, similarly to the present embodiment, three motor drive devices 10 of the first embodiment are combined, and each of the three coils of the three-phase brushless motor has three motor drive devices 10. As in this embodiment, the signals indicating the failure detected by the three motor drive devices 10 are transmitted without increasing the wiring and connection terminals for transmitting the failure signal to the host control device 2. be able to.

DESCRIPTION OF SYMBOLS 1, 5 ... Motor drive system, 2 ... Host control device, 3 ... Battery, 4 ... Motor 10, 10-1, 10-2 ... Motor drive device, 11 ... Coil, 12 ... Capacitor 110 ... Command signal interface, 120 ... Driver control unit 130, 140 ... switching element, 131, 141 ... FET
132, 142 ... diode 150 ... temperature detection unit, 151 ... thermistor, 152 ... resistance 160 ... failure determination unit, 161 ... determination processing unit, 162 ... current measurement unit, 163 ... temperature measurement unit 164 ... voltage measurement unit, 170 ... failure Signal output section

Claims (11)

A motor driving device that drives the motor in response to a command signal indicating driving and braking of the motor input from a host control device,
A switching element for switching whether to supply power to the motor;
A driver control unit that switches on and off of the switching element in response to the command signal;
A current measuring unit for measuring a current value applied to the motor;
A voltage measuring unit for measuring a voltage value applied to the motor;
A temperature measuring unit for measuring the ambient temperature of the switching element;
A determination processing unit that detects a failure by comparing each of the measurement results of the current measurement unit, the voltage measurement unit, and the temperature measurement unit with a predetermined threshold value, and outputs a signal indicating the detected failure;
A failure signal output unit that generates a failure signal according to the signal output from the determination processing unit and outputs the failure signal through one output signal line;
The said apparatus is accommodated in one package. The motor drive device characterized by the above-mentioned. The failure signal output unit is
The motor drive device according to claim 1, wherein an alternating signal having a different duty ratio is output as the failure signal according to a signal indicating the failure output by the determination processing unit. The failure signal output unit is
The motor drive device according to claim 1, wherein a signal having a different potential is output as the failure signal according to a signal indicating the failure output by the determination processing unit. The determination processing unit
The signal indicating the failure with the highest priority among the detected failures is output to the failure signal output unit based on a predetermined priority order. The motor drive device described in 1. 5. The control unit according to claim 1, wherein the control unit switches on and off of the switching element at a predetermined cycle when it is detected that the command signal is not input. 6. The motor drive device of any one of Claims. The determination processing unit
Whether or not a current equal to or greater than a predetermined first threshold value is applied to the motor from the current value measured by the current measuring unit, the switching element switching failure, and the connection to the motor as a load is disconnected. The motor drive device according to any one of claims 1 to 5, wherein a failure is detected. The determination processing unit
The voltage failure which detects that the voltage value applied to the motor is out of a predetermined voltage range is detected from the voltage value measured by the voltage measurement unit. Motor drive device. The driver controller
The switching element is switched between on and off at a cycle predetermined by the control unit when the ambient temperature measured by the temperature measurement unit is equal to or higher than a second threshold value set in advance. The motor drive device according to claim 7. The determination processing unit
9. The motor driving device according to claim 8, wherein the switching element is turned off when an ambient temperature measured by the temperature measuring unit is higher than the second threshold and becomes equal to or higher than a predetermined third threshold. . A motor drive system connected to a direct current motor and comprising the two motor drive devices according to any one of claims 1 to 9 and a control device,
The control device includes:
When the DC motor is rotated forward, control is performed to pass a current from one of the two motor driving devices to the other motor driving device via the motor, and when the DC motor is rotated reversely, The motor drive system characterized by performing control which sends an electric current from the other motor drive unit to one motor drive unit via the said motor among two motor drive units. A motor drive system connected to a three-phase brushless motor and comprising the three motor drive devices according to any one of claims 1 to 9 and a control device,
The control device outputs the command signal to each of the three motor drive devices in response to a command signal input from the host control device,
Each of the three motor driving devices is associated with each of three coils of the three-phase brushless motor,
The motor control system, wherein the driver control unit included in each of the three motor driving devices switches the switching element on and off according to a rotation angle of a rotor of the three-phase brushless motor.

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