WO2018198928A1 - モータ制御装置及び電動工具 - Google Patents
モータ制御装置及び電動工具 Download PDFInfo
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- WO2018198928A1 WO2018198928A1 PCT/JP2018/016133 JP2018016133W WO2018198928A1 WO 2018198928 A1 WO2018198928 A1 WO 2018198928A1 JP 2018016133 W JP2018016133 W JP 2018016133W WO 2018198928 A1 WO2018198928 A1 WO 2018198928A1
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- WIPO (PCT)
- Prior art keywords
- motor
- monitoring
- operating voltage
- value
- monitor signal
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/22—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-emitting devices, e.g. LED, optocouplers
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B1/00—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/04—Single phase motors, e.g. capacitor motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/16—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using ac to ac converters without intermediate conversion to dc
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/20—Arrangements for starting
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/24—Arrangements for stopping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
- B24B23/06—Portable grinding machines, e.g. hand-guided; Accessories therefor with abrasive belts, e.g. with endless travelling belts; Accessories therefor
Definitions
- the present invention relates to a motor control device and an electric tool that use electric power of an external power source for operation and control of a motor.
- motors are used for various purposes in a wide range of fields such as home appliances and industrial use.
- portable electric devices that operate the motor built in the main unit by inserting the plug attached to the main unit via an electric cord into an outlet and receiving power from an external power source such as a commercial AC power source
- an external power source such as a commercial AC power source
- this type of electric device is configured such that the user can control the operation / stop of the device by his / her own intention by manually operating an on / off switch provided in the main body.
- the user may inadvertently insert the plug into the outlet with the on / off switch turned on.
- various troubles may occur.
- the external power supply suddenly fails during operation of the equipment and the motor stops, and immediately after the power failure returns and the motor restarts unexpectedly.
- Patent Documents 1, 2, and 3 Various types have been developed.
- JP 60-174079 A JP-A-8-308098 Japanese Patent Laid-Open No. 8-336779
- the plug when plugging / unplugging or temporary power failure, the plug is reinserted after a while (generally after a few seconds), after the motor has stopped, Alternatively, when the power failure is restored, the motor control device is reset once to cope with it, so that unexpected start and restart of the motor can be prevented. However, if a power failure is restored or the plug is re-inserted within 1 to 2 seconds after the motor stops, the plug is re-inserted without resetting the motor controller under an unstable or unstable operating voltage. As a result of responding to the recovery from a power failure, the motor may be unexpectedly started or restarted against the user's intention.
- the present invention solves the above-described problems of the prior art, and provides a motor control device and a power tool provided with the motor control device that can accurately and surely prevent the start or restart of the motor unintended by the user. provide.
- a motor control device is an on / off circuit that is electrically connected to the external power supply in series with the motor in order to control the operation of the motor that rotates by receiving power from the external power supply.
- a switch an operating voltage generation circuit that inputs electric power from the external power supply and outputs a DC operating voltage, and monitors the state of the on / off switch or the state of the power supply line between the on / off switch and the motor,
- a motor control device comprising: a first monitoring unit that generates a first monitor signal indicating whether or not electric power is supplied from the external power source to the power supply line, and monitors the operating voltage;
- a second monitoring unit for generating a second monitor signal indicating whether the voltage level of the operating voltage is higher or lower than a preset monitoring value; and operating under the operating voltage;
- the first monitoring unit monitors the state of the on / off switch or the state of the power supply line between the on / off switch and the motor, and the voltage level of the operating voltage is monitored by the second monitoring unit. Since the control unit double-checks the first monitor signal from the first monitoring unit and the second monitor signal from the second monitoring unit to control the start and stop of the motor, Even if the power input is suddenly stopped and restarted immediately, it is possible to reliably and reliably prevent the motor from starting or restarting unintentionally by the user.
- a motor control device is an on / off circuit that is electrically connected to the external power source in series with the external power source in order to control the operation of the motor that receives power from the external power source and rotates.
- a second control unit that monitors whether a voltage level of the operating voltage is higher or lower than a preset monitoring value, and operates under the operating voltage, And a control unit that controls start and stop of the motor based on monitoring information from the first and second monitoring units, and the control unit is located before the second monitoring unit. Under the condition that the monitoring information that the voltage level of the operating voltage is higher than the monitoring value is output, the monitoring information that the on / off switch is switched from the OFF state to the ON state is output from the first monitoring unit.
- the motor is activated in response to the monitoring information from the first monitoring unit, and the control unit has a voltage level of the operating voltage higher than the monitoring value than the second monitoring unit.
- the monitoring information indicating that the input of power from the external power source to the power supply line is cut off is issued from the first monitoring unit under the state where the monitoring information is output.
- the motor is stopped, and the control unit outputs monitoring information that the voltage level of the operating voltage is lower than the monitoring value from the second monitoring unit.
- the first monitoring Be issued more monitoring information and the input power is started or resumed from the external power source to the power supply line, characterized in that it does not start the motor.
- the first monitoring unit monitors the state of the on / off switch or the state of the power supply line between the on / off switch and the motor, and the voltage level of the operating voltage is monitored by the second monitoring unit. Since the control unit double-checks the monitoring information from the first monitoring unit and the monitoring information from the second monitoring unit to control the start and stop of the motor, the power input from the external power supply is Even if the motor is suddenly stopped and restarted immediately, it is possible to prevent the motor from starting or restarting unintentionally and reliably.
- An electric power tool includes a main body, a movable tool attached to the main body so as to perform a certain movement, and the main body for driving the tool by receiving power from an external power source.
- a motor provided in the main body, and an on / off switch provided in the main body for controlling the operation of the motor upon receiving power from the external power source, and provided in series with the motor with respect to the external power source;
- An operation voltage generation circuit that inputs electric power from the external power supply and outputs a DC operation voltage; and monitors the state of the on / off switch or the state of the power supply line between the on / off switch and the motor;
- a motor control device including a first monitoring unit that generates a first monitor signal indicating whether or not power is supplied from the power source to the power supply line.
- a second monitoring tool wherein the motor control device monitors the operating voltage and generates a second monitor signal indicating whether the voltage level of the operating voltage is higher or lower than a preset monitoring value. And a controller that operates under the operating voltage and controls the start and stop of the motor based on the information of the first monitor signal and the information of the second monitor signal. To do.
- the motor control device according to the first aspect of the present invention is provided, so that even if the input of electric power from the external power supply stops unexpectedly and restarts immediately, the motor is not started by the user. Alternatively, restart can be prevented accurately and reliably, and safety and workability can be improved.
- An electric power tool includes a main body, a movable tool attached to the main body so as to perform a certain movement, and the main body for driving the tool by receiving power from an external power source.
- a motor provided in the main body, and an on / off switch provided in the main body for controlling the operation of the motor upon receiving power from the external power source, and provided in series with the motor with respect to the external power source;
- An operating voltage generation circuit that inputs electric power from the external power source and outputs a DC operating voltage, and a first state that monitors a state of the on / off switch or a state of a power supply line between the on / off switch and the motor
- a motor control device having a monitoring unit, which monitors whether the voltage level of the operating voltage is higher or lower than a preset monitoring value.
- the motor is started in response to the monitoring information from the first monitoring unit, and the control unit performs the operation from the second monitoring unit.
- Monitoring information that the input of power from the external power source to the power supply line is cut off from the first monitoring unit under a state where monitoring information indicating that the voltage level of the voltage is higher than the monitoring value is output.
- the first monitoring In response to the monitoring information from the control unit, the motor is stopped, and the control unit is in a state in which monitoring information is output from the second monitoring unit that the voltage level of the operating voltage is lower than the monitoring value. Below, even if the monitoring information that the input of the electric power from the external power supply to the power supply line is started or restarted is output from the first monitoring unit, the motor is not started.
- the motor control device according to the second aspect of the present invention is provided, so that even if the input of power from the external power supply is stopped unexpectedly and restarts immediately, the motor is not started by the user. Alternatively, restart can be prevented accurately and reliably, and safety and workability can be improved.
- the motor control device of the present invention with the configuration and operation as described above, it is possible to accurately start or restart the motor unintended by the user with respect to the stop of input of electric power from the external power source and the restart of input immediately after. It can be surely prevented.
- the above-described configuration and operation can reliably and reliably prevent the start or restart of the motor unintended by the user, and improve safety and workability.
- an on-off switch is turned off and a plug is inserted in an outlet, it is a timing diagram which shows the state of each part when electric power is normally supplied from an external power supply.
- FIG. 1 shows an external appearance of an electric belt grinding machine as an electric tool in one embodiment of the present invention.
- the electric belt grinding machine 1 includes a cylindrical main body 10, an outlet plug 14 that is attached to the base end portion of the main body 10 via an electric cord 12, and a grinding head that is turnably attached to a distal end portion of the main body 10. 16, a movable grinding belt 18 extending from the base end portion to the tip end portion of the grinding head 16, a rod-shaped handle 20 fixed to the grinding head 16, and an on / off switch provided at an appropriate position on the outer peripheral surface of the main body 10. 22 and a display unit 24.
- the main body 10 also functions as one gripping part paired with the handle 20, and accommodates a circuit board of a motor 30 and a motor control device 32 (FIGS. 2 and 3), which will be described later. Further, a transmission mechanism (not shown) such as a gear for transmitting the rotational driving force of the motor 30 to the grinding head 16 is also accommodated at the tip of the main body 10.
- a driving pulley (not shown) is accommodated in the base end portion of the grinding head 16 and a driven pulley (not shown) is attached to the tip end portion thereof, and an endless grinding belt 18 is provided between both pulleys. Is stretched.
- the rotational driving force of the motor 30 is transmitted to the grinding belt 18 through the transmission mechanism and the driving pulley, and the grinding belt 18 linearly moves between both pulleys while rubbing the workpiece (not shown). As a result, the workpiece is ground or polished.
- the on / off switch 22 is composed of, for example, a slide-type manual switch, and is locked at the released position when the user releases the finger at the on or off position.
- the display unit 24 has, for example, a plurality of LEDs or lamps, and displays the operation status of the belt grinding machine, an alarm in the event of an abnormal situation, or the like in a predetermined luminescent color.
- FIG. 2 is a block diagram showing the system configuration of the motor 30 and the motor control device 32 mounted on the electric belt grinding machine.
- the motor 30 is composed of, for example, a single-phase AC motor, and has, for example, a constant effective value V E (for example, 100 volts) from a commercial AC (alternating current) power supply 34 via the outlet plug 14, the electric cable 12 (FIG. 1), and the on / off switch 22. ), And is rotated under the control of the motor control device 32.
- V E for example, 100 volts
- the motor control device 32 includes, as a basic configuration, an on / off switch 22, a main control unit 36, a motor control circuit 38, an operating voltage generation circuit 40, a reference clock / timing unit 42, a motor rotation number measurement unit 44, An SW / AC monitoring unit 46 and an operating voltage monitoring unit 48 are provided.
- the operating voltage generation circuit 40 is provided in parallel with the motor 30 with respect to the AC power supply 34, receives the AC power E from the AC power supply 34, and sets the DC operating voltage VCC to a predetermined rated value (for example, 5 (Volts).
- Operating voltage V CC output from the operating voltage generation circuit 40 is supplied through all the units or operating voltage supply line to the integrated circuit requires an operating voltage in the motor control device 32.
- the motor control circuit 38 is provided in series with the on / off switch 22 and the motor 30 with respect to the AC power supply 34.
- AC power E is input from the AC power source 34 via the plug 14 and the electric cable 12 and the on / off switch 22 is in the on state, the current that the motor control circuit 38 passes to the motor 30 under the control of the main control unit 36 Is to control.
- the reference clock / timing unit 42 includes an oscillator 50 and a zero-cross detection unit 52.
- the oscillator 46 is formed of, for example, a crystal oscillator, and generates a basic clock CK necessary for calculations and other processes in the main control unit 36.
- the zero-cross detection unit 52 detects the timing at which the commercial frequency AC supplied from the AC power supply 34 crosses the zero level, and is a reference timing pulse necessary for the ignition control or phase control of the motor 30 by the main control unit 36. A signal CZ is generated.
- the motor rotation number measurement unit 44 includes a rotation detection sensor 54 that detects the position of the rotating body (rotor) of the motor 30, and a rotation number calculation unit that calculates the rotation speed of the motor 30 based on the output signal of the rotation detection sensor 54. 56.
- the SW / AC monitoring unit 46 is a first monitoring unit in this embodiment, and monitors the state of the on / off switch SW or the state of the power supply line 35 between the on / off switch SW and the motor 30, and An SW / AC monitor signal (first monitor signal) MS indicating whether or not electric power is input to the power supply line 35 is generated.
- the operating voltage monitoring unit 48 is a second monitoring unit in this embodiment, and inputs the same voltage as the operating voltage VCC supplied from the operating voltage generation circuit 40 to the main control unit 36 to monitor this, and operates.
- the voltage level of the voltage V CC is configured to generate an operating voltage monitoring signal (second monitoring signal) MV indicating a higher or lower than the monitored value preset.
- the main control unit 36 receives the operating voltage VCC from the operating voltage generation circuit 40, receives the basic clock CK and the timing pulse signal CZ from the reference clock timing unit 42 (50, 52), and receives the motor.
- a rotation speed measurement value representing the rotation speed of the motor 30 is input from the rotation speed measurement unit 44 (54, 56), a SW / AC monitor signal MS is input from the SW / AC monitoring unit 46, and an operation is performed from the operating voltage monitoring unit 48.
- the voltage monitor signal MV is input.
- the main control unit 36 has signal processing and arithmetic processing functions, and controls the start, rotation operation, and stop of the motor 30 through the motor control circuit 38.
- FIG. 3 shows a specific circuit configuration of the motor control device 32 in this embodiment.
- the main control unit 36 and the rotation speed calculation unit 56 are configured by a microcomputer as a preferable form.
- the rotation detection sensor 54 is configured by a Hall IC as a preferred form.
- the operating voltage generation circuit 40 is composed of an AC / DC converter circuit.
- the operating voltage generation circuit 40 includes an input capacitor 60, a full-wave rectifier circuit 62 including four bridge-connected diodes, and a Zener diode 64 for smoothing or ripple suppression. , 66, resistors 68 and 70, and an output circuit 74 including a capacitor 72.
- the zero-cross detector 52 is configured by a photocoupler 76 as a preferred form.
- the phototransistor 76a of the photocoupler 76 is instantaneously turned off only when the alternating current at the commercial frequency crosses the zero level, and the collector of the phototransistor 76a.
- a timing pulse signal CZ indicating the start timing of each half cycle of the commercial AC frequency is obtained at the terminal.
- the timing pulse signal CZ is supplied to a predetermined input port of the main control unit 36.
- the motor control circuit 38 has a bidirectional thyristor 78 and a phototriac 80 as a preferred form.
- the bidirectional thyristor 78 constitutes a switching element and is electrically connected in series with the on / off switch 22 and the motor 30 with respect to the AC power supply 34.
- the phototriac 80 forms an ignition circuit or a phase control circuit in combination with the peripheral capacitor 82 and the resistors 83 and 84, and the light emitting diode 80 a is connected to a predetermined output port of the main control unit 36.
- the main control unit 36 controls the turning on (lighting) and turning off (lighting off) of the light emitting diode 80a, thereby causing the bidirectional thyristor 78 to synchronize with the timing pulse signal CZ via the phototriac 80. Switching control is performed at the corners, and the current flowing through the motor 30 can be arbitrarily controlled.
- the motor control circuit 38 uses the phototriac 80 in the ignition circuit or the phase control circuit, and thereby operates with the motor drive system circuit and the operating voltage operating under the high voltage (AC 100 volts) of the AC power supply 34. Electrically isolated from the control system circuit operating at (DC 5 volts).
- the SW / AC monitoring unit 46 has, as a preferred form, a branch path or branch circuit 86 that is electrically connected in parallel to the power supply line 35 or the motor 30, and the branch circuit 86 includes a photocoupler 88 and a current.
- a limiting resistor 90 is provided in series connection.
- the phototransistor 88 a of the photocoupler 88 has its collector terminal connected to the voltage supply line or terminal of the operating voltage VCC via the pull-up resistor 92 and to a predetermined input port of the main controller 36.
- the emitter terminal is connected to the ground potential terminal.
- the SW / AC monitoring unit 46 having such a configuration, when the AC power E from the AC power source 34 is input to the power supply line 35 via the on / off switch 22, regardless of the state (rotation / stop) of the motor 30. A current flows through the branch circuit 86, the phototransistor 88a of the photocoupler 88 is turned on, and the SW / AC monitor signal MS obtained at its collector terminal becomes the ground potential, that is, the L level.
- V H for example, 2.0 volts
- V L for example, 0.8 volts
- the SW / AC monitoring unit 46 uses the photocoupler 88 as a current detection unit for detecting whether or not a current is flowing through the branch circuit 86, so that the high voltage (AC 100 volts) of the AC power supply 34 is obtained. ) And a monitor signal output circuit operating at an operating voltage (DC 5 volts) are electrically isolated from each other.
- Operating voltage monitoring unit 48 is constituted by an integrated circuit as a preferred form, both as compared although not shown, to set the voltage level of the operating voltage V CC to enter than the operating voltage generation circuit 40 in advance and the monitoring value V K
- a comparator that outputs a comparison result representing the level relationship between the two and the output signal, and an output circuit that supplies the comparison result output from the comparator as a binary operating voltage monitor signal MV to the main control unit 36. More specifically, when the voltage level of the operating voltage V CC is higher than the monitoring value V K is a monitor signal MV is outputted at H level, when the voltage level of the operating voltage V CC is lower than the monitoring value V K is monitored The signal MV is output at the L level.
- Monitoring value V K is set to a value higher than the limit value of the operating voltage V CC to the main control unit 36 can function normally. For example, when the rated value V S of the operating voltage VCC is 5 volts, the monitored value V K is set to 4.5 volts.
- the display unit 24 includes, for example, three LEDs 94R, 94Y, and 94B whose emission colors are red, yellow, and blue (or green). These LEDs 94R, 94Y, and 94B are connected in parallel to the output port of the main control unit 36, and are individually controlled to be turned on, blinked, and turned off.
- FIG. 4 is a flowchart showing a basic control procedure of the main control unit 36 relating to the start and stop of the motor 30 in the motor control device 32.
- FIG. 5 and FIG. 6 are timing diagrams showing changes in the states of the respective parts when AC power is normally supplied from the AC power supply 34 during operation of the electric belt grinding machine.
- the motor control device 32 when the plug 14 is inserted into the outlet of the AC power source 34, the AC power E from the AC power source 34 is input to the operating voltage generation circuit 40 regardless of the state of the on / off switch 22, and the operating voltage is An operating voltage VCC is output from the generation circuit 40. At this time, the operating voltage V CC rises therewith until the 0 rated value from the bolt instantaneously V S (DC5 volts).
- V S DC5 volts
- each unit operating under the operating voltage V CC i.e. the main control unit 36, the motor rotation speed measurement unit 44 (54, 56), such as operating voltage monitoring unit 48 Become active.
- the supply of the timing pulse signal CZ to the main control unit 36 is started from the zero cross detection unit 48 simultaneously with the start of the input of the AC power E.
- the main control unit 36 performs necessary initial settings for the registers and input / output ports used this time by initialization (step S 101 ).
- this initialization it sets the set value of the unit delay time T P (for example, 10 ms) and the set value of the delay times N S (e.g. 5 times).
- the unit delay time T P is set to a sufficiently shorter than the monitoring point arrival time T K which will be described later.
- the main control unit 36 takes in the SW / AC monitor signal MS from the SW / AC monitoring unit 46 through a predetermined input port and reads the logical value thereof (step S 102 ).
- the on / off switch 22 is in the off state.
- the SW / AC monitoring unit 46 since no current flows through the branch circuit 86, the phototransistor 88a of the photocoupler 88 is in an off state.
- the SW / AC monitor signal MS changes from the previous L level to the H level in conjunction with the rise of the operating voltage VCC .
- the SW / AC monitor signal MS changes from the H level to the L level when the user turns on the on / off switch 22 (time point t 1 ).
- the SW / AC monitoring unit 46 current starts to flow through the branch circuit 86, the phototransistor 88a of the photocoupler 88 changes from the off state to the on state, and the SW / AC monitor signal MS changes from the H level. Change to L level.
- the main control unit 36 When the SW / AC monitor signal MS changes from the H level to the L level (time point t 1 ), the main control unit 36 starts the motor 30 through the motor control circuit 38 (steps S 107 ⁇ S 109 ). Thereafter, the main control unit 36 monitors the SW / AC monitor signal MS and confirms that the monitor signal MS is at the L level, while loop [E] (steps S 109 ⁇ S 110 ⁇ S 111 ⁇ S 109 ⁇ ...) And the motor 30 continues to rotate.
- the main control unit 36 measures the motor 30 through the motor control circuit 38 while measuring the rotation number or load of the motor 30 through the motor rotation number measurement unit 44 (54, 56).
- the control unit controls the current to flow to the user, and informs the user of the operation status (especially the load status) through the display unit 24 in real time.
- the blue (green) LED 94B is lit during normal or no load (maximum rotation speed)
- the yellow LED 94Y is lit during light load (rotation speed 80%)
- red high load
- the LED 94R is turned on.
- the red LED 94R blinks at a high speed, for example, at intervals of 0.2 seconds, and then the motor 30 is stopped. Control can be performed.
- the SW / AC monitor signal MS changes from the L level up to that level to the H level.
- the SW / AC monitoring unit 46 no current flows through the branch circuit 86, and the phototransistor 88a of the photocoupler 88 is turned off.
- FIG. 6 shows a case where the user inserts the plug 14 into the outlet of the AC power supply 34 with the on / off switch 22 turned on.
- the operating voltage generation circuit 40 is the operating voltage V CC the rated value V
- the operating voltage monitor signal MV rises from the previous L level to the H level.
- the main control unit 36 reads the SW / AC monitor signal MS immediately after the initial setting (step S 101 ) (step S 102 ), the monitor signal MS remains at the L level. That is, in the SW / AC monitoring unit 46, since the on / off switch 22 is in the on state, current starts to flow through the branch circuit 86 simultaneously with the start of the input of the AC power E, and the phototransistor 88a of the photocoupler 88 is in the on state. As a result, the SW / AC monitor signal MS remains at the L level. The main control unit 36 continues to loop around the loop [A] (steps S 102 ⁇ S 104a ⁇ S R ⁇ S 102 ⁇ S 104a ...) And waits for the monitor signal MS to change from the L level to the H level.
- the SW / AC monitoring unit 46 stops the current flow through the branch circuit 86, the phototransistor 88a of the photocoupler 88 is turned off, and the SW / AC monitor signal MS is at the L level. Changes from H to H level.
- the motor 30 does not start, and the on / off switch 22 is once switched off and then turned on. When switched, the motor 30 is started.
- AC power E input a certain time until the voltage level of the operating voltage V CC from the time t a which is stopped dividing the predetermined monitoring value V K of (monitoring point arrival time) T K (e.g. 30 ms) time immediately after elapsed, at a time t C has elapsed 40ms example from AC power input stop time t a, the user again plug 14 into the outlet, the input of the AC power E indicates the case where the resume.
- V K of (monitoring point arrival time) T K e.g. 30 ms
- the voltage level of the SW / AC monitor signal MS once rises to around the rated value V S once the input of the AC power E stops, and then decreases exponentially following the operating voltage V CC .
- the main control unit 36 Loop [A] ⁇ It remains within [C] and does not shift to motor start preparation (step S 106 ). That is, where the turned 4 Loop [C], i.e. at a time t b from the AC power input stop time t a has passed 40 ms, operation voltage monitor signal MV is changed from H level to L level, whereby the loop [C ] To loop [B] (steps S 103 ⁇ S 104b ⁇ S R ⁇ ).
- Example of FIG. 8 (after the lapse of e.g. 20ms from the AC power input stop time t a) input the previous time from the expiration of the monitoring point arrival time T K (30 ms) from the time t a which is stopped in the AC power E At t ⁇ , the user reinserts the plug 14 into the outlet, and the input of AC power E resumes.
- the SW / AC monitor signal MS is checked in the loop [C] (step S 103 ⁇ S 104c ⁇ S 105 ⁇ S 102) . Then, since the change from SW / AC monitor signal MS at even time t beta H level to L level, it enters a loop [A], remaining within the loop [A] after this.
- the main control unit 36 double-checks the monitoring information (MS) from the SW / AC monitoring unit 46 and the monitoring information (MV) from the operating voltage monitoring unit 48 to determine the operating voltage.
- the green LED 94G is blinked at a low speed through an alarm on the display unit 24, so that the user can operate the on / off switch 22. Prompt.
- the control procedure of the main control unit 36 is as shown in FIG. 9, and the voltage level or logical value of each unit is shown in FIG. As shown in FIG.
- the step of checking the monitoring information from the operating voltage monitoring unit (48) to (operation voltage monitor signal MV) step S 103
- the delay associated process step S R, S F, S P
- the main control unit 36 controls the start and stop of the motor 30 based only on the monitoring information (SW / AC monitor signal MS) from the SW / AC monitoring unit 46. become.
- the control procedure (FIG. 4) of the main control unit 36 can be modified as shown in FIG.
- the delay initialization process (step S R ), the delay count check process (step S P ), and the loop [C] are omitted, and instead the SW / AC monitor signal recheck process (step S G ) and loop [F] are added.
- the delay time T P in the delay process (step S F) equal to or monitoring point arrival time T K (30 ms), it more is set to slightly longer value (e.g. 30 ⁇ 35ms).
- the same operation as that shown in FIGS. 7 and 8 is performed.
- the operating voltage generation circuit 40 may generate a plurality of types of operating voltages.
- the operating voltage monitoring unit 48 may monitor the voltage level of any one of the plurality of types of operating voltages normally supplied to the main control unit 36.
- the external power supply 34 is not limited to a single-phase commercial AC power supply, and may be a single-phase or three-phase AC power supply having an arbitrary frequency, or a DC power supply. Therefore, the operating voltage generation circuit 40 is not limited to a single-phase AC / DC converter circuit, but may be a three-phase AC / DC converter circuit, or may be configured by a switching power supply circuit, an inverter circuit, or the like.
- the motor 30 is not limited to a single-phase AC motor, and may be an arbitrary motor.
- a high-speed current detection unit can be configured by using a photocoupler as in the above embodiment, but a relay or the like can be used instead of the photocoupler.
- the electric belt grinding machine in the above embodiment is an example of the electric tool of the present invention
- the present invention is a power source such as an electric chamfering machine, a disk grinding machine, a disk polishing machine, a peeling machine, a cutting machine, and a hole punching machine.
- the present invention can be applied to any power tool of an external power feeding system that uses a motor.
- the motor control device of the present invention is not limited to an electric power tool, but can be applied to an arbitrary electric device of an external power feeding system that uses a motor as a power source.
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- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
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Abstract
Description
図1に、本発明の一実施形態における電動工具として電動式ベルト研削機の外観を示す。この電動式ベルト研削機1は、円筒状の本体10と、この本体10の基端部に電気コード12を介して取り付けられるコンセントプラグ14と、本体10の先端部に旋回可能に取り付けられる研削ヘッド16と、この研削ヘッド16の基端部から先端部にわたって延在する可動の研削ベルト18と、研削ヘッド16に固着された棒状のハンドル20と、本体10の外周面の適所に設けられるオンオフスイッチ22および表示部24とを有している。
図2に、この電動式ベルト研削機に搭載されるモータ30およびモータ制御装置32のシステム構成をブロック図で示す。
次に、図4~図11を参照して、この実施形態におけるモータ制御装置32の作用を説明する。
以上、本発明の好適な実施形態について説明したが、上述した実施形態は本発明を限定するものではない。当業者にあっては、具体的な実施態様において本発明の技術思想および技術範囲から逸脱せずに種々の変形・変更を加えることが可能である。
22 オンオフスイッチ
30 モータ
32 モータ制御装置
34 AC電源
36 主制御部
38 モータ制御回路
40 動作電圧生成回路
46 SW/AC監視部
48 動作電圧監視部
78 双方向サイリスタ
88 フォトカプラ
Claims (18)
- 外部電源より電力の供給を受けて回転するモータの動作を制御するために、前記外部電源に対して前記モータと電気的に直列に設けられるオンオフスイッチと、前記外部電源からの電力を入力して直流の動作電圧を出力する動作電圧生成回路と、前記オンオフスイッチの状態または前記オンオフスイッチと前記モータとの間の給電ラインの状態を監視し、前記外部電源より前記給電ライン上に電力が供給されているか否かを表す第1のモニタ信号を発生する第1の監視部とを備えるモータ制御装置であって、
前記動作電圧を監視し、前記動作電圧の電圧レベルがあらかじめ設定した監視値より高いか低いかを表す第2のモニタ信号を発生する第2の監視部と、
前記動作電圧の下で動作し、前記第1のモニタ信号の情報と前記第2のモニタ信号の情報とに基づいて前記モータの起動および停止を制御する制御部と
を有することを特徴するモータ制御装置。 - 前記第1の監視部は、前記外部電源から見て前記オンオフスイッチの後段で前記モータと電気的に並列に接続される分岐回路と、前記分岐回路に電流が流れているか否かを検出する電流検出部とを有する、請求項1に記載のモータ制御装置。
- 前記電流検出部は、前記分岐回路に設けられるフォトカプラを有し、
前記フォトカプラのフォトトランジスタは、前記動作電圧の電圧供給端子に抵抗を介して接続される第1の端子と、グランド電位端子に接続される第2の端子とを有し、前記第1の端子に前記第1のモニタ信号が得られる、
請求項2に記載のモータ制御装置。 - 前記第1のモニタ信号は、前記動作電圧の定格値とグランド電位との間に設定された第1の閾値およびそれより低い第2の閾値を有する2値信号として生成され、
前記制御部は、前記第1のモニタ信号の電圧レベルが前記第1の閾値より高いときは、前記第1のモニタ信号が第1の論理値を有していると判断し、前記第1のモニタ信号の電圧レベルが前記第2の閾値より低いときは、前記第1のモニタ信号が第2の論理値を有していると判断する、
請求項3に記載のモータ制御装置。 - 前記制御部は、前記第2のモニタ信号が前記動作電圧の電圧レベルが前記監視値より高いことを表している状態の下で、前記第1のモニタ信号が第1の論理値から第2の論理値に変化した時に、前記モータを起動し、
前記制御部は、前記第2のモニタ信号が前記動作電圧の電圧レベルが前記監視値より高いことを表している状態の下で、前記第1のモニタ信号が第2の論理値から第1の論理値に変化した時に、前記モータを停止する、
請求項4に記載のモータ制御装置。 - 前記制御部は、前記第2のモニタ信号が前記動作電圧の電圧レベルが前記監視値より低いことを表している状態の下では、前記第1のモニタ信号が第1の論理値から第2の論理値に変化しても前記モータを起動しない、請求項5に記載のモータ制御装置。
- 前記監視値は、前記オンオフスイッチがオン状態の下で前記外部電源から前記給電ラインへの電力の入力が止まったときに、前記第1のモニタ信号の電圧レベルが前記閾値より低くなる前に前記動作電圧が前記監視値より低くなるように設定される、請求項5に記載のモータ制御装置。
- 前記第2の監視部は、前記動作電圧の電圧レベルが前記監視値より高いときは前記第2のモニタ信号を第1の論理値で発生し、前記動作電圧の電圧レベルが前記監視値より低いときは前記第2のモニタ信号を第2の論理値で発生する、請求項5~7のいずれか一項に記載のモータ制御装置。
- 前記制御部は、前記第2のモニタ信号が第2の論理値を有している限り、前記第1のモニタ信号の値に関係なく前記モータを起動しない、請求項8に記載のモータ制御装置。
- 前記制御部は、前記モータを停止した直後は、その停止時から所定のディレイ時間が経過するまでは、前記第1のモニタ信号または前記第2のモニタ信号の値に関係なく前記モータの停止状態を保持する、請求項1に記載のモータ制御装置。
- 前記ディレイ時間は、前記オンオフスイッチがオン状態の下で前記外部電源から前記給電ラインへの電力の入力が止まったときに、前記動作電圧の電圧レベルが定格値から前記監視値まで低下するのに要する時間と同じか、またはそれよりも少しだけ長い時間に設定される、請求項10に記載のモータ制御装置。
- 前記制御部は、前記モータを停止した直後は、所定のディレイ時間を挟んで前記第1のモニタ信号と前記第2のモニタ信号とを所定回数繰り返してチェックする、請求項1に記載のモータ制御装置。
- 前記ディレイ時間は、前記動作電圧の電圧レベルが定格値から前記監視値まで低下するのに要する時間よりも短い時間に設定される、請求項12に記載のモータ制御装置。
- 前記外部電源に対して前記モータおよび前記オンオフスイッチと電気的に直列に接続されるスイッチング素子が備えられ、
前記制御部は、前記スイッチング素子を一定の周波数でスイッチング制御することにより前記モータの回転動作を制御し、前記モータを停止させるときは前記スイッチング素子をオフにする、
請求項1に記載のモータ制御装置。 - 前記外部電源は交流電源であり、
前記動作電圧生成回路は、前記交流電源より入力した交流の電力を直流の電力に変換する交直変換回路を有し、
前記交直変換回路は、その出力段にコンデンサを有し、そのコンデンサの充電電圧を前記動作電圧として出力する、
請求項1に記載のモータ制御装置。 - 外部電源より電力の供給を受けて回転するモータの動作を制御するために、前記外部電源に対して前記モータと電気的に直列に設けられるオンオフスイッチと、前記外部電源からの電力を入力して直流の動作電圧を出力する動作電圧生成回路と、前記オンオフスイッチの状態または前記オンオフスイッチと前記モータとの間の給電ラインの状態を監視する第1の監視部とを備えるモータ制御装置であって、
前記動作電圧の電圧レベルがあらかじめ設定した監視値より高いか低いかを監視する第2の監視部と、
前記動作電圧の下で動作し、前記第1および第2の監視部からの監視情報に基づいて前記モータの起動および停止を制御する制御部と
を有し、
前記制御部は、前記第2の監視部より前記動作電圧の電圧レベルが前記監視値より高いとの監視情報が出されている状態の下で、前記第1の監視部より前記オンオフスイッチがオフ状態からオン状態に切り替わったとの監視情報が出されたときは、前記第1の監視部からのその監視情報に応動して前記モータを起動し、
前記制御部は、前記第2の監視部より前記動作電圧の電圧レベルが前記監視値より高いとの監視情報が出されている状態の下で、前記第1の監視部より前記外部電源から前記給電ラインへの電力の入力が絶たれたとの監視情報が出されたときは、前記第1の監視部からのその監視情報に応動して前記モータを停止し、
前記制御部は、前記第2の監視部より前記動作電圧の電圧レベルが前記監視値より低いとの監視情報が出されている状態の下では、前記第1の監視部より前記外部電源から前記給電ラインへの電力の入力が開始または再開されたとの監視情報が出されても、前記モータを起動しない、
ことを特徴とするモータ制御装置。 - 本体と、
一定の運動を行うように前記本体に取り付けられる可動の工具と、
外部電源より電力の供給を受けて前記工具を駆動するために前記本体に設けられるモータと、
前記外部電源より電力の供給を受けて前記モータの動作を制御するために前記本体に設けられ、前記外部電源に対して前記モータと電気的に直列に設けられるオンオフスイッチと、前記外部電源からの電力を入力して直流の動作電圧を出力する動作電圧生成回路と、前記オンオフスイッチの状態または前記オンオフスイッチと前記モータとの間の給電ラインの状態を監視し、前記外部電源より前記給電ライン上に電力が供給されているか否かを表す第1のモニタ信号を発生する第1の監視部とを有するモータ制御装置と、
を備える電動工具であって、
前記モータ制御装置が、前記動作電圧を監視し、前記動作電圧の電圧レベルがあらかじめ設定した監視値より高いか低いかを表す第2のモニタ信号を発生する第2の監視部と、前記動作電圧の下で動作し、前記第1のモニタ信号の情報と前記第2のモニタ信号の情報とに基づいて前記モータの起動および停止を制御する制御部とを有する、
ことを特徴する電動工具。 - 本体と、
一定の運動を行うように前記本体に取り付けられる可動の工具と、
外部電源より電力の供給を受けて前記工具を駆動するために前記本体に設けられるモータと、
前記外部電源より電力の供給を受けて前記モータの動作を制御するために前記本体に設けられ、前記外部電源に対して前記モータと電気的に直列に設けられるオンオフスイッチと、前記外部電源からの電力を入力して直流の動作電圧を出力する動作電圧生成回路と、前記オンオフスイッチの状態または前記オンオフスイッチと前記モータとの間の給電ラインの状態を監視する第1の監視部とを有するモータ制御装置と、
を備える電動工具であって、
前記動作電圧の電圧レベルがあらかじめ設定した監視値より高いか低いかを監視する第2の監視部と、
前記動作電圧の下で動作し、前記第1および第2の監視部からの監視情報に基づいて前記モータの起動および停止を制御する制御部と、
を有し、
前記制御部は、前記第2の監視部より前記動作電圧の電圧レベルが前記監視値より高いとの監視情報が出されている状態の下で、前記第1の監視部より前記オンオフスイッチがオフ状態からオン状態に切り替わったとの監視情報が出されたときは、前記第1の監視部からのその監視情報に応動して前記モータを起動し、
前記制御部は、前記第2の監視部より前記動作電圧の電圧レベルが前記監視値より高いとの監視情報が出されている状態の下で、前記第1の監視部より前記外部電源から前記給電ラインへの電力の入力が絶たれたとの監視情報が出されたときは、前記第1の監視部からのその監視情報に応動して前記モータを停止し、
前記制御部は、前記第2の監視部より前記動作電圧の電圧レベルが前記監視値より低いとの監視情報が出されている状態の下では、前記第1の監視部より前記外部電源から前記給電ラインへの電力の入力が開始または再開されたとの監視情報が出されても、前記モータを起動しない、
ことを特徴とする電動工具。
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- 2018-04-19 CN CN201880025597.1A patent/CN110521108B/zh active Active
- 2018-04-19 WO PCT/JP2018/016133 patent/WO2018198928A1/ja active Application Filing
- 2018-04-19 KR KR1020197030682A patent/KR102342214B1/ko active IP Right Grant
- 2018-04-19 DE DE112018002164.5T patent/DE112018002164T5/de active Pending
- 2018-04-19 JP JP2019514439A patent/JP6811850B2/ja active Active
- 2018-04-19 GB GB1913570.6A patent/GB2575571B/en active Active
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS60174079A (ja) * | 1984-02-17 | 1985-09-07 | Mitsubishi Electric Corp | 電気機器の保護制御装置 |
WO2017022361A1 (ja) * | 2015-07-31 | 2017-02-09 | 日立工機株式会社 | 電動工具 |
JP2017071010A (ja) * | 2015-10-06 | 2017-04-13 | 株式会社マキタ | 電動工具 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2023058277A1 (ja) * | 2021-10-08 | 2023-04-13 | パナソニックIpマネジメント株式会社 | 掃除機から塵埃を回収する回収装置及び回収装置に接続される掃除機 |
Also Published As
Publication number | Publication date |
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CN110521108A (zh) | 2019-11-29 |
KR20190128696A (ko) | 2019-11-18 |
KR102342214B1 (ko) | 2021-12-22 |
TWI685404B (zh) | 2020-02-21 |
GB2575571B (en) | 2022-03-02 |
JP6811850B2 (ja) | 2021-01-13 |
GB2575571A (en) | 2020-01-15 |
CN110521108B (zh) | 2023-10-03 |
GB201913570D0 (en) | 2019-11-06 |
DE112018002164T5 (de) | 2020-01-09 |
JPWO2018198928A1 (ja) | 2020-05-14 |
TW201843018A (zh) | 2018-12-16 |
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