CN110521108B - Motor control device and electric tool - Google Patents

Motor control device and electric tool Download PDF

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Publication number
CN110521108B
CN110521108B CN201880025597.1A CN201880025597A CN110521108B CN 110521108 B CN110521108 B CN 110521108B CN 201880025597 A CN201880025597 A CN 201880025597A CN 110521108 B CN110521108 B CN 110521108B
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CN
China
Prior art keywords
motor
monitor
voltage
value
monitoring
Prior art date
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Active
Application number
CN201880025597.1A
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Chinese (zh)
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CN110521108A (en
Inventor
远藤大辅
清水裕之
宫城贵则
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Nitto Kohki Co Ltd
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Nitto Kohki Co Ltd
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Publication of CN110521108A publication Critical patent/CN110521108A/en
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Classifications

    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electric Motors In General (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Control Of Ac Motors In General (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Abstract

The motor control device (32) is provided with a switch (22), a main control unit (36), a motor control circuit (38), an operating voltage generation circuit (40), an SW/AC monitoring unit (46), and an operating voltage monitoring unit (48). A SW/AC monitoring unit (46) monitors the state of the Switch (SW) or the state of the power supply line (35) between the Switch (SW) and the motor (30). An operating voltage monitoring unit (48) monitors the operating voltage (V) output from the operating voltage generating circuit (40) CC ) Is a voltage potential of (a) a voltage potential of (b). The main control unit (36) controls the start and stop of the motor (30) by double checking the SW/AC Monitoring Signal (MS) from the SW/AC monitoring unit (46) and the operating voltage monitoring signal (MV) from the operating voltage monitoring unit (48).

Description

Motor control device and electric tool
Technical Field
The present invention relates to a motor control device and an electric tool that use electric power from an external power source for motor operation and control.
Background
Nowadays, motors (motors) are used for various purposes in a wide range of fields such as home appliances and industry. Among them, there are many portable electric appliances that are installed in a main body via a power line, and that are plugged into a socket, and that are operated by receiving power from an external power source such as a commercial ac power source to operate a motor built in the main body. In general, the electric appliance controls the operation/stop of the machine according to the user's own will by manually operating a switch provided in the main body.
However, there are cases where a user inserts a plug into a socket in a state that the switch is unintentionally turned on, and in this case, various troubles are generated when the electric appliance is accidentally started. Various complications can also occur when the external power source is suddenly de-energized during operation of the machine, the motor is stopped, and then immediately de-energized and the motor is accidentally restarted.
Conventionally, in the field of electric tools, various motor control devices have been developed which have a function of preventing accidental starting or restarting of a motor when a socket plug is plugged in or out and power is turned back off in order to improve safety and workability (patent documents 1, 2, and 3).
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 60-174079
Patent document 2: japanese patent laid-open No. 8-308098
Patent document 3: japanese patent laid-open No. 8-336779
Disclosure of Invention
Problems to be solved by the invention
In the portable electric appliance of the external power supply mode, when the plug is plugged back or the power is turned off again after a lapse of a certain period of time (usually after a lapse of several seconds or more) after the stop of the motor, the motor control device is temporarily reset to cope with the unexpected start or restart of the motor can be prevented in advance. However, if the power is turned off again or the plug is plugged back within 1 to 2 seconds after the motor is stopped, the motor control device is not reset to cope with the plug-back and the power-off return under an unstable or uncertain operation voltage, and thus the motor may be started or restarted accidentally against the intention of the user.
The present invention is to solve the above-described problems of the prior art and provides a motor control device capable of accurately and surely preventing the start or restart of a motor which is not intended by a user, and an electric tool provided with the motor control device.
Means for solving the problems
A motor control device according to the first aspect of the present invention includes: a switch provided in electrical series with the motor with respect to the external power supply, for controlling an operation of the motor that rotates upon receiving supply of electric power from the external power supply; an operation voltage generation circuit that receives power from the external power supply and outputs a dc operation voltage; and a 1 st monitoring unit that monitors a state of the switch or a state of a power supply line between the switch and the motor, and generates a 1 st monitoring signal indicating whether or not to supply power from the external power source to the power supply line, the motor control device being characterized by comprising: a 2 nd monitor unit configured to monitor the operation voltage and generate a 2 nd monitor signal, the 2 nd monitor signal indicating whether a voltage potential of the operation voltage is higher or lower than a preset monitor value; and a control unit that operates at the operation voltage and controls the start and stop of the motor based on the information of the 1 st monitor signal and the information of the 2 nd monitor signal.
In the motor control device having the above configuration, the 1 st monitor unit is configured to monitor the state of the switch or the state of the power supply line between the switch and the motor, and the 2 nd monitor unit is configured to monitor the voltage level of the operating voltage, and the control unit is configured to control the start and stop of the motor by double checking the 1 st monitor signal from the 1 st monitor unit and the 2 nd monitor signal from the 2 nd monitor unit, so that even if the power input from the external power supply is stopped accidentally and restarted again, the start or restart of the motor not intended by the user can be prevented accurately and surely.
A motor control device according to the 2 nd aspect of the present invention includes: a switch provided in electrical series with the motor with respect to the external power supply, for controlling an operation of the motor that rotates upon receiving supply of electric power from the external power supply; an operation voltage generation circuit that receives power from the external power supply and outputs a dc operation voltage; and a 1 st monitoring unit that monitors a state of the switch or a state of a power supply line between the switch and the motor, wherein the motor control device includes: a 2 nd monitoring unit configured to monitor whether a voltage potential of the operation voltage is higher or lower than a preset monitoring value; and a control unit that operates at the operating voltage and controls starting and stopping of the motor based on the monitoring information of the 1 st monitoring unit and the 2 nd monitoring unit, wherein the control unit starts the motor in response to the monitoring information from the 1 st monitoring unit when the 1 st monitoring unit gives monitoring information that the switch has been switched from an off state to an on state in a state in which the 2 nd monitoring unit gives monitoring information that the operating voltage has a higher voltage potential than the monitoring value; when the 1 st monitoring unit gives monitoring information that the power input from the external power source to the power supply line has been cut off in a state where the 2 nd monitoring unit gives monitoring information that the voltage potential of the operating voltage is higher than the monitoring value, the control unit stops the motor in response to the monitoring information from the 1 st monitoring unit; in a state where the 2 nd monitoring unit gives monitoring information that the voltage potential of the operating voltage is lower than the monitoring value, the control unit does not start the motor even if the 1 st monitoring unit gives monitoring information that the power input from the external power source to the power supply line has started or restarted.
In the motor control device having the above configuration, the 1 st monitor unit is configured to monitor the state of the switch or the state of the power supply line between the switch and the motor, and the 2 nd monitor unit is configured to monitor the voltage level of the operating voltage, and the control unit is configured to control the start and stop of the motor by double checking the monitoring information from the 1 st monitor unit and the monitoring information from the 2 nd monitor unit, so that even if the power input from the external power supply is stopped accidentally and restarted again, the start or restart of the motor which is not intended by the user can be prevented accurately and surely.
The electric power tool according to the aspect 1 of the present invention includes: a main body; a movable tool mounted to the main body to perform a certain movement; a motor provided in the main body, for receiving supply of electric power from an external power source and driving the tool; a motor control device provided in the main body and configured to receive power from the external power source and control an operation of the motor, the motor control device including a switch provided in electrical series with the motor with respect to the external power source, an operation voltage generation circuit to which power from the external power source is input and which outputs a dc operation voltage, and a 1 st monitor unit that monitors a state of the switch or a state of a power supply line between the switch and the motor and generates a 1 st monitor signal indicating whether or not power is supplied from the external power source to the power supply line, the motor control device comprising: a 2 nd monitor unit configured to monitor the operation voltage and generate a 2 nd monitor signal, the 2 nd monitor signal indicating whether a voltage potential of the operation voltage is higher or lower than a preset monitor value; and a control unit that operates at the operation voltage and controls the start and stop of the motor based on the information of the 1 st monitor signal and the information of the 2 nd monitor signal.
In the electric power tool having the above configuration, by providing the motor control device according to the aspect 1 of the present invention, even if the power input from the external power source is stopped accidentally and restarted immediately, the motor that is not intended by the user can be prevented from being started or restarted accurately and assuredly, and safety and workability can be improved.
The electric power tool according to claim 2 of the present invention includes: a main body; a movable tool mounted to the main body to perform a certain movement; a motor provided in the main body, for receiving supply of electric power from an external power source and driving the tool; a motor control device provided in the main body and configured to receive power from the external power source and control an operation of the motor, the motor control device including a switch provided in electrical series with the motor with respect to the external power source, an operation voltage generation circuit to which power from the external power source is input and which outputs a dc operation voltage, and a 1 st monitor unit configured to monitor a state of the switch or a state of a power supply line between the switch and the motor, the motor control device comprising: a 2 nd monitoring unit configured to monitor whether a voltage potential of the operation voltage is higher or lower than a preset monitoring value; and a control unit that operates at the operating voltage and controls starting and stopping of the motor based on the monitoring information from the 1 st monitoring unit and the 2 nd monitoring unit, wherein the control unit starts the motor in response to the monitoring information from the 1 st monitoring unit when the 1 st monitoring unit gives the monitoring information that the switch has been switched from the off state to the on state in a state in which the 2 nd monitoring unit gives the monitoring information that the operating voltage has a higher voltage potential than the monitoring value; when the 1 st monitoring unit gives monitoring information that the power input from the external power source to the power supply line has been cut off in a state where the 2 nd monitoring unit gives monitoring information that the voltage potential of the operating voltage is higher than the monitoring value, the control unit stops the motor in response to the monitoring information from the 1 st monitoring unit; in a state where the 2 nd monitoring unit gives monitoring information that the voltage potential of the operating voltage is lower than the monitoring value, the control unit does not start the motor even if the 1 st monitoring unit gives monitoring information that the power input from the external power source to the power supply line has started or restarted.
In the electric power tool having the above configuration, by providing the motor control device according to the aspect 2 of the present invention, even if the electric power input from the external power source is stopped accidentally and restarted immediately, the motor that is not intended by the user can be prevented from being started or restarted accurately and assuredly, and safety and workability can be improved.
Effects of the invention
According to the motor control device of the present invention, by the above-described configuration and action, the motor start or restart, which is not intended by the user, can be accurately and surely prevented with respect to the stop of the input of electric power from the external power source and the restart of the subsequent input.
According to the electric tool of the present invention, the motor start or restart not intended by the user can be accurately and surely prevented by the above-described constitution and action, and the safety and workability can be improved.
Drawings
Fig. 1 is a perspective view showing an external appearance of an electric belt grinder as an electric tool according to an embodiment of the present invention.
Fig. 2 is a block diagram showing a system configuration of a motor and a motor control device mounted on the electric belt grinder.
Fig. 3 is a circuit diagram showing a specific circuit configuration of the motor control device according to the above embodiment.
Fig. 4 is a flowchart showing a basic control flow of the main control unit of the motor control device related to the start and stop of the motor in the above embodiment.
Fig. 5 is a timing chart showing the states of the respective parts in the case where the external power source normally supplies power when the switch is turned off and the plug is inserted into the socket in the above embodiment.
Fig. 6 is a timing chart showing changes in the state of each part in the case where power is normally supplied from the external power source when the switch is turned on and the plug is inserted into the socket in the above-described embodiment.
Fig. 7 is a timing chart showing a change in the state of each part in an example in which the input of electric power from the external power source is temporarily stopped and then restarted immediately during the operation in the above-described embodiment.
Fig. 8 is a timing chart showing a change in the state of each part in another example in which the input of electric power from the external power source is temporarily stopped and then restarted immediately during the operation in the above-described embodiment.
Fig. 9 is a flowchart showing a basic control flow of the main control unit in a case (comparative example) where the operation voltage monitoring unit is removed from the motor control device according to the above embodiment.
Fig. 10 is a timing chart showing changes in the state of each part in the comparative example (fig. 9).
Fig. 11 is a flowchart showing a modification of the control flow of the main control unit in the motor control device.
Detailed Description
An embodiment of the present invention is described below with reference to the drawings.
[ appearance Structure of electric tool ]
Fig. 1 shows an external appearance of an electric belt grinder as an electric tool according to an embodiment of the present invention. The electric belt grinder 1 includes a cylindrical main body 10, a socket plug 14 attached to a base end portion of the main body 10 via a power line 12, a grinding belt 16 rotatably attached to a front end portion of the main body 10, a movable grinding belt 18 extending from the base end portion of the grinding belt 16 over the entire front end portion, a rod-shaped handle 20 fixed to the grinding belt 16, a switch 22 provided at a proper position on an outer peripheral surface of the main body 10, and a display portion 24.
The main body 10 also serves as a single grip portion for mating with the handle 20, and houses therein a circuit board of a motor 30 and a motor control device 32 (fig. 2 and 3) described later. A gear transmission mechanism (not shown) such as a gear for transmitting the rotational driving force of the motor 30 to the grinding belt 16 is also accommodated in the front end portion of the main body 10. The grinding belt 16 accommodates a driving pulley (not shown) at its base end portion, and a driven pulley (not shown) is attached to its tip end portion, and an endless grinding belt 18 is stretched between the two pulleys. During machining, the rotational driving force of the motor 30 is transmitted to the grinding belt 18 via the transmission mechanism, the driving pulley, and the like, and the grinding belt 18 moves linearly between the pulleys while rubbing a workpiece (not shown), thereby grinding or polishing the workpiece.
The switch 22 is constituted by, for example, a slide type manual switch, and is locked in its released position when the user releases the finger in its on position or off position. The display unit 24 includes, for example, a plurality of LEDs or lamps, and displays a warning or the like when the belt grinder is operated or abnormal, by lighting or blinking with a predetermined luminous color.
[ constitution of Motor control device ]
Fig. 2 is a block diagram showing a system configuration of a motor 30 and a motor control device 32 mounted on the electric belt grinder.
The motor 30 is constituted by, for example, a single-phase alternating current motor, and is opened via the outlet plug 14, the electric wire 12 (fig. 1)The switch 22 receives a signal having a certain effective value V from, for example, a commercial AC (alternating current) power supply 34 E AC power E of a commercial frequency (for example, 100 volts) is supplied to perform a rotation operation under the control of the motor control device 32.
The motor control device 32 includes a switch 22, a main control unit 36, a motor control circuit 38, an operating voltage generating circuit 40, a reference clock/timing unit 42, a motor revolution number measuring unit 44, an SW/AC monitoring unit 46, and an operating voltage monitoring unit 48.
The operating voltage generating circuit 40 is provided in parallel with the motor 30 with respect to the AC power supply 34, and is configured to input AC power E from the AC power supply 34 and output a dc operating voltage V at a predetermined rated value (for example, 5 volts) CC . The operating voltage V output from the operating voltage generating circuit 40 CC Is supplied to all units or integrated circuits in the motor control device 32 that require an operating voltage via an operating voltage supply line.
The motor control circuit 38 is disposed in electrical series with the switch 22 and the motor 30 with respect to the AC power source 34. When AC power E is input from the AC power source 34 via the plug 14 and the electric wire 12 and the switch 22 is in the on state, the motor control circuit 38 controls the current flowing to the motor 30 under the control of the main control section 36.
The reference clock/timing section 42 includes an oscillator 50 and a zero-crossing detection section 52. The oscillator 46 is configured by, for example, a crystal oscillator, and generates a basic clock CK necessary for operations and other processes in the main control unit 36. The zero-crossing detection unit 52 detects the timing at which the commercial frequency AC supplied from the AC power supply 34 crosses the zero potential, and generates a reference timing pulse signal CZ necessary for the main control unit 36 to perform ignition control or phase control of the motor 30.
The motor revolution number measuring unit 44 includes a rotation detection sensor 54 that detects the position of the rotating body (rotor) of the motor 30, and a revolution number calculating unit 56 that calculates the rotational speed of the motor 30 based on an output signal of the rotation detection sensor 54.
The SW/AC monitoring unit 46 is a 1 st monitoring unit in the present embodiment, and is configured to monitor the state of the switch SW or the state of the power supply line 35 between the switch SW and the motor 30, and to generate an SW/AC monitoring signal (1 st monitoring signal) MS indicating whether or not electric power from the AC power source 34 is input to the power supply line 35.
The operating voltage monitor 48 is a 2 nd monitor in the present embodiment, and is configured to input and monitor the operating voltage V supplied from the operating voltage generating circuit 40 to the main control unit 36 CC The same voltage, and generates an operating voltage monitor signal (2 nd monitor signal) MV, which represents the operating voltage V CC Whether the voltage potential of (a) is higher or lower than a preset monitor value.
As described above, the main control unit 36 inputs the operating voltage V to the operating voltage generating circuit 40 CC The basic clock CK and the timing pulse signal CZ are input from the reference clock/timing unit 42 (50, 52), the revolution number measurement value indicating the rotational speed of the motor 30 is input from the motor revolution number measurement unit 44 (54, 56), the SW/AC monitor signal MS is input from the SW/AC monitor unit 46, and the operating voltage monitor signal MV is input from the operating voltage monitor unit 48. The main control unit 36 has a signal processing and arithmetic processing function, and controls the start, rotation, and stop of the motor 30 by the motor control circuit 38.
Fig. 3 shows a specific circuit configuration of the motor control device 32 in the present embodiment. The main control unit 36 and the revolution number calculation unit 56 are preferably constituted by a microcomputer (microcomputer). The rotation detection sensor 54 is preferably constituted by a Hall IC (Hall IC). The operating voltage generating circuit 40 is preferably constituted by an ac/dc conversion circuit, and includes an input capacitor 60, a full-wave rectifying circuit 62 composed of 4 bridged diodes, and an output circuit 74, wherein the output circuit 74 includes zener diodes 64, 66, resistors 68, 70, and a capacitor 72 for smoothing or suppressing ripple (ripple).
The zero-crossing detector 52 is preferably constituted by a photocoupler 76. When AC power E is input from the AC power supply 34, the phototransistor 76a of the photocoupler 76 is turned off instantaneously only when the AC of the commercial frequency crosses zero potential, and a timing pulse signal CZ indicating the start timing of each half cycle of the commercial AC frequency is obtained at the collector terminal of the phototransistor 76 a. The timing pulse signal CZ is supplied to a predetermined input port of the main control section 36.
The motor control circuit 38 preferably has a triac (bidirectional thyristor) 78 and a phototriac (photo triac) 80. Here, the triac 78 constitutes a switching element, and is electrically connected in series with the switch 22 and the motor 30 with respect to the AC power source 34. The phototriac 80, in combination with the peripheral capacitor 82 and resistors 83, 84, constitutes an ignition circuit or phase control circuit, with the light emitting diode 80a connected to a prescribed output port of the main control unit 36. The main control unit 36 controls the turning on (turning on) and off (turning off) of the light emitting diode 80a, thereby controlling the triac 78 via the phototriac 80 in synchronization with a desired firing angle or phase angle of the timing pulse signal CZ, and thereby arbitrarily controlling the current flowing to the motor 30.
In this way, the motor control circuit 38 electrically isolates the circuit of the motor drive system operating at the high voltage (AC 100 volts) of the AC power supply 34 from the circuit of the control system operating at the operating voltage (DC 5 volts) by using the triac 80 in the ignition circuit or the phase control circuit.
The SW/AC monitoring section 46 preferably has a branch or branch circuit 86 electrically connected in parallel to the power supply line 35 or the motor 30, and a photocoupler 88 and a current limiting resistor 90 are connected in series to the branch circuit 86. Here, the collector terminal of the phototransistor 88a of the photocoupler 88 is connected to the operating voltage V via a pull-up resistor 92 CC And is connected to a prescribed input port of the main control section 36, while the emitter terminal of the phototransistor 88a is connected to a ground potential terminal.
In the SW/AC monitoring unit 46 configured as described above, when AC power E from the AC power supply 34 is input to the power supply line 35 via the switch 22, current is equalized to the branch circuit 86 and the phototransistor 88a of the photocoupler 88 is turned on, and the SW/AC monitoring signal MS obtained at the collector terminal thereof becomes the ground potential, i.e., L potential, regardless of the state (rotation/stop) of the motor 30. However, when AC power E is input to the operating voltage generating electricity When the channel 40 is not input to the power supply line 35 (when the switch 22 is in the off state), the phototransistor 88a of the photocoupler 88 is turned off, and the SW/AC monitor signal MS obtained at the collector terminal thereof becomes the operation voltage V CC The potential of (2) is H potential. The main control unit 36 receives and monitors the SW/AC monitor signal MS at any time, and when the voltage potential is higher than a predetermined H potential threshold value V H When (e.g., 2.0 volts) is high, the monitor signal MS is determined to be at H potential (ms= "H"), and when it is higher than a predetermined L potential threshold V L When (e.g., 0.8 volt) is low, the monitor signal MS is judged to be L potential (ms= "L"). In addition, when the voltage level of the monitor signal MS is at the L level threshold V L And H potential threshold V H And if so, the time is uncertain.
In this way, the SW/AC monitoring section 46 electrically isolates the current detection circuit operating at the high voltage (AC 100 volts) of the AC power supply 34 from the monitor signal output circuit operating at the operating voltage (DC 5 volts) by using the photocoupler 88 in the current detection section for detecting whether or not the current flows to the branch circuit 86.
The operating voltage monitor 48 is preferably constituted by an integrated circuit, and includes a comparator for comparing the operating voltage V input from the operating voltage generating circuit 40, and an output circuit, although not shown in the drawings CC Voltage potential of (2) and a preset monitor value V K And outputs a comparison result indicating the relationship between the two voltages, and the output circuit gives the comparison result from the comparator as a binary operation voltage monitor signal MV to the main control unit 36. In more detail, when the operating voltage V CC Voltage-potential ratio monitor value V of (2) K When high, the monitor signal MV is outputted at H potential, and when the operating voltage V CC Voltage-potential ratio monitor value V of (2) K When low, the monitor signal MV is output at L potential. When the operating voltage V CC Voltage potential and monitor value V of (2) K If the same, it is determined that mv= "H" or mv= "L". Monitor value V K Is set to an operating voltage V which is higher than the operating voltage V at which the main control unit 36 can normally operate CC Is higher than the limit value of (c). For example, if the operating voltage V CC Nominal value V of (2) S At 5 volts, the monitor value V K Set to 4.5Volts.
The display unit 24 includes, for example, 3 LEDs 94R, 94Y, 94B having red, yellow, and blue (or green) emission colors. The LEDs 94R, 94Y, 94B are connected in parallel to the output port of the main control unit 36, and individually control on and off.
[ action of Motor control device ]
Next, the operation of the motor control device 32 in the present embodiment will be described with reference to fig. 4 to 11.
Fig. 4 shows a basic control flow of the main control unit 36 of the motor control device 32 related to the start and stop of the motor 30 in a flowchart. Fig. 5 and 6 show a change in the state of each part when AC power is normally supplied from the AC power source 34 during the operation of the present electric belt grinder in a time chart.
In the motor control device 32, when the plug 14 is plugged into the socket of the AC power supply 34, the AC power E from the AC power supply 34 is input to the operating voltage generating circuit 40 and the operating voltage V is output from the operating voltage generating circuit 40, regardless of the state of the switch 22 CC . At this time, the operating voltage V CC From the previous 0 volt instant up to the nominal value V S (DC 5 volts). When the action voltage V CC Rising to rated value V S At the time of operation voltage V CC The following parts, i.e., the main control unit 36, the motor revolution number measuring units 44 (54, 56), the operation voltage monitoring unit 48, and the like, become active. On the other hand, the AC power E starts to be input, and simultaneously, the zero-crossing detection unit 48 starts to supply the timing pulse signal CZ to the main control unit 36.
The main control unit 36 first performs necessary initialization for the register, input/output port, and the like used at this time by initialization (step S 101 ). In the initialization, a unit delay time T is set P Set value (e.g., 10 ms) of the delay times N S For example 5 times). Then, initialization (n=0) of the number of delays is performed (step S R ). In addition, unit delay time T P Is set to be longer than the monitor value arrival time T K Short values. Next, the main control unit 36 receives the signal from the SW/AC monitoring through a predetermined input port The SW/AC monitoring signal MS of the section 46 reads the logic value thereof (step S 102 )。
As shown in fig. 5, in general, when the user inserts the plug 14 into the receptacle of the AC power source 34 (time point t 0 ) The switch 22 is turned off. In this case, in the SW/AC monitoring section 46, since no current flows to the branch circuit 86, the phototransistor 88a of the photocoupler 88 is in an off state. Thereby, at the same time as the input of the AC power E is started, i.e., at the time point t 0 And an operating voltage V CC In conjunction with the rising of (a), the SW/AC monitoring signal MS changes from the previous L potential to the H potential. Therefore, the main control unit 36 determines that ms= "H", and the delay time T elapses P (step S) F ) Thereafter, the value of the operating voltage monitor signal MV from the operating voltage monitor 48 is read (step S 103 ). At this time, the operating voltage V CC Rising to nominal (5 volts), mv= "H".
When the state of ms= "H" and mv= "H" is confirmed, the main control unit 36 performs 5-cycle processing [ C ]](step S) P →S 104c →S 105 →S 102 →S F →S 103 →S P The number of delays N reaches the set number of times N S At (5 times), i.e. from time t 0 After 50ms (10 ms×5), the loop processing [ C ] is skipped]And prepares for starting the motor 30 (step S P →S 106 ) Then continuously performing circulation treatment [ D ]](step S) 107 →S 108 →S 107 →.cndot.) waiting for the SW/AC monitoring signal MS to change from H potential to L potential.
As shown in fig. 5, the change of the SW/AC monitor signal MS from the H potential to the L potential is at the time when the user turns on the switch 22 (time point t 1 ). At this time, in the SW/AC monitoring section 46, a current starts to flow to the branch circuit 86, the phototransistor 88a of the photocoupler 88 is changed from the off state to the on state, and the SW/AC monitoring signal MS is changed from the H potential to the L potential.
The main control section 36 when the SW/AC monitor signal MS changes from the H potential to the L potential (time point t 1 ) The motor 30 is started by the motor control circuit 38 (step S 107 →S 109 ). Thereafter, master controlThe control unit 36 monitors the SW/AC monitor signal MS and continuously performs the cycle process [ E ] while confirming that the monitor signal MS is at the L potential](step S) 109 →S 110 →S 111 →S 109 And →.cndot.) the rotational motion of the motor 30 is continued.
While continuing the rotation operation of the motor 30, the main control unit 36 controls the current flowing to the motor 30 by the motor control circuit 38 while measuring the number of rotations of the motor 30 and even the load by the motor number measuring units 44 (54, 56), and notifies the user of the operation status (particularly the load status) in real time by the display unit 24. For example, the blue (green) LED 94B is lighted at ordinary times or no load (the rotation number is maximum), the yellow LED 94Y is lighted at light load (the rotation number is 80%), and the lamp red LED94R is lighted at high load (the rotation number is 60%). When the load is exceeded, for example, the motor 30 is stopped after the red LED94R is blinked at a high speed at intervals of 0.2 seconds, and immediately after the stop, the red LED94R may be switched from blinking at a high speed to blinking at a low speed at intervals of 1 second, or the like.
Then, the grinding process of the electric belt grinder is completed, and when the user turns off the switch 22 (time t 2 ) The SW/AC monitor signal MS is changed from the previous L potential to the H potential. At this time, no current flows to the branch circuit 86 in the SW/AC monitoring section 46, and the phototransistor 88a of the photocoupler 88 is turned off.
When the SW/AC monitor signal MS changes from the L potential to the H potential, the main control unit 36 completely turns off the switching element 78 of the motor control circuit 38 at this timing to stop the motor 30 (step S) 110 →S 112 ). Then, initialization (n=0) of the number of delays is performed (step S 113 →S R ) The cycle process [ C ] is performed in the same manner as immediately after the start of input of the AC power E]With a set number N of delay times S The confirmation of ms= "H" and mv= "H" is repeated (5 times), and the motor start preparation is entered (step S) P →S 106 ) Then continuously performing circulation treatment [ D ]]Waiting for switch 22 to switch on.
In the example shown in FIG. 5, it is shown that the user has a time point t after a period of time, for example, a period of several seconds or more 3 And the plug 14 is pulled out from the socket. In this case, when the plug 14 is pulled out from the socket, the main control unit 36 no longer inputs the AC power E from the AC power supply 34 to the operating voltage generating circuit 40, and the operating voltage V, which is the output voltage of the operating voltage generating circuit 40 CC From the nominal value down to zero volts. In this case, the charge accumulated in the output capacitor 72 of the operating voltage generating circuit 40 is discharged through the resistor 70, and the operating voltage V is thereby generated CC Gradually decreasing with a certain time constant. Then, when the operating voltage V CC When the operation limit value is lower than a predetermined operation limit value (for example, about 1.8 volts), the main control unit 36 becomes inactive.
Fig. 6 shows a case where the user inserts the plug 14 into the socket of the AC power source 34 when the switch 22 is set to the on state. In this case, regardless of the state of the switch 22, the input of the AC power E from the AC power supply 34 is started at the same time (time point t 0 ) The operating voltage generating circuit 40 generates an operating voltage V CC Rising to rated value V S The operating voltage monitor signal MV rises from the previous L potential to the H potential.
In this case, when the main control unit 36 performs initial setting (step S 101 ) When the SW/AC monitoring signal MS is read immediately thereafter (step S 102 ) The monitor signal MS is maintained at the L potential. That is, in the SW/AC monitoring section 46, since the switch 22 is in the on state, the AC power E starts to be input and the current starts to flow to the branch circuit 86, the phototransistor 88a of the photocoupler 88 becomes the on state, and the SW/AC monitoring signal MS is held at the L potential. The main control unit 36 continues the loop processing [ a ] ](step S) 102 →S 104a →S R →S 102 →S 104a How much,) wait for the monitor signal MS to change from L potential to H potential.
Then, when the user switches the switch 22 to off, no current flows in the SW/AC monitoring section 46 to the branch circuit 86, the phototransistor 88a of the photocoupler 88 is turned off, and the SW/AC monitoring signal MS changes from the L potential to the H potential. Therefore, the main control unit 36 confirms the states of ms= "H" and mv= "H", and performs the 5-cycle processing [ C ]]When the delay times N reach the set times N S At (5 times), i.e. from the point in timet 0 After 50ms (10 ms×5), the process proceeds to preparation for starting the motor 30 (step S) P →S 106 ) Continuously performing cyclic treatment [ D ]]Until the switch 22 is switched on.
Then, when the user turns on the switch 22 (time point t 1 ) Since the SW/AC monitor signal MS changes from the H potential to the L potential, the loop processing [ D ] is skipped]The motor 30 is started (step S) 107 →S 109 ) Performing cyclic treatment [ E ]]While continuing the rotation of the motor 30. Then, when the user turns off the switch 22 or pulls out the plug 14 from the socket, the motor 30 is stopped due to the monitor signal MS changing from the L potential to the H potential (step S 110 →S 112 ). The subsequent control program and operation are the same as those in the case of fig. 5.
As such, in this embodiment, even if the user inserts the plug 14 into the socket of the AC power source 34 while setting the switch 22 to the on state, the motor 30 is not started, and the motor 30 is started when the switch 22 is once switched off and then switched on.
Incidentally, as shown in FIG. 7, during the period in which the motor 30 is continuing to rotate, at, for example, time t a A power outage occurs suddenly or the plug 14 is accidentally pulled out of the socket. In this case, the input of AC power E is suspended, and thus, even if switch 22 is in the on state, the power supply to power supply line 35 and motor 30 is suspended, and the power supply to operating voltage generating circuit 40 is suspended. However, in the operating voltage generating circuit 40, since the electric power stored in the capacitor 72 of the output circuit 74 is discharged with a constant time constant, the operating voltage V, which is the output voltage thereof CC From the previous nominal value V S Exponentially drops as normally when the plug 14 is pulled out of the socket.
Accordingly, at the same time as the input of the AC power E is stopped, the current flowing to the branch circuit 86 is cut off so far in the SW/AC monitor section 46, the phototransistor 88a of the photocoupler 88 is turned off, and the SW/AC monitor signal MS is changed from the previous L potential to the H potential. The main control unit 36 stops the motor control circuit 38 at the timing when the monitor signal MS changes (ms= "L" → "H"), thereby stopping the motor control 30 #Step S 110 →S 112 )。
In the example of fig. 7, it shows a case where, at a point of time t when the input from the AC power E has just been stopped a To the action voltage V CC Is reduced to a monitor value V K A fixed time (monitor value arrival time) T K Time point after (e.g. 30 ms), e.g. stop time point t from AC power E input a A time point t of 40ms has elapsed c The user reinserts the plug 14 into the receptacle and the input of AC power E resumes.
In this case, when at the time point t c When the input of the AC power E from the AC power supply 34 is restarted, the operating voltage generating circuit 40 instantaneously causes the operating voltage V CC Return to rated value V S The operating voltage monitor 48 also changes the operating voltage monitor signal MV instantaneously from the L potential to the H potential. On the other hand, at the same time as the input of the AC power E is restarted, the SW/AC monitoring section 46 turns on the phototransistor 88a of the photocoupler 88, and the voltage potential of the SW/AC monitor signal MS is instantaneously dropped from the previous H potential to zero volt (L potential). In addition, when the input of the AC power E is stopped, the voltage potential of the SW/AC monitoring signal MS temporarily rises to the rated value V S Nearby, then follow the action voltage V CC Decreasing exponentially. The main control unit 36 determines that ms= "H" until the voltage potential of the SW/AC monitor signal MS decreases to the H potential threshold V H 。
The processing flow of the main control unit 36 in this case is as follows. That is, after stopping the motor 30, the number of delays is initialized (n=0) (step S 113 →S R ) Ms= "H" and mv= "H" are confirmed, and the cyclic process [ C ] is continued]. During this period, when the above-mentioned monitor value reaches time T K At (30 ms), since the operating voltage monitor signal MV changes from the H potential to the L potential, the loop processing [ C]Move to loop processing [ B](step S) 103 →S 104b →S R →S 102 →S F →S 103 And. Fwdarw. Cndot.). Then, at the subsequent time point t c In this way, when the input of the AC power E is restarted, the operation voltage monitor signal MV is restored from the L potentialWhen the potential is returned to H, the cycle process [ B ] is skipped]Checking the number of delays (step S) 103 →S P ). At this time, since the delay times have not reached the set times N S (5 times) thus enter the cyclic process [ C ]]While checking the SW/AC monitoring signal MS (step S P →S 104c →S 105 →S 102 ). Then, since ms= "L", loop processing [ a ] is entered](step S) 102 →S 104a →S R The cycle treatment [ A ] is continued thereafter]。
In the present embodiment, even at the input restart time point t of the AC power E c Exceeding the unit delay time (10 ms) times the delay set number N S In the case of the obtained time (50 ms), the main control unit 36 remains in the loop processing [ a ]]～[C]In the process, the operation is not shifted to the motor start preparation (step S) 106 ). That is, when 4 cycles of treatment [ C]At the time, i.e. at the time point t of stopping input of AC power a Time point t of 40ms elapsed b The operation voltage monitor signal MV changes from H potential to L potential, thereby processing [ C ] from a loop]Transfer to loop processing [ B](step S) 103 →S 104b →S R And. Fwdarw. Cndot.). Thereafter, when at time point t c When the AC power E input resumes, although the loop process [ B ] is skipped](step S) 103 →S P ) But due to the delay times not reaching the set times N S (5 times), once enter loop processing [ C](step S) P →S 104c →S 105 →S 102 ). However, since the SW/AC monitoring signal MS is at the L potential at this time, the loop processing [ C]Transfer to loop processing [ A](step S) 102 →S 104a →S R →.cndot.) and then left in the recycling process [ A ]]Is a kind of medium.
In the example of fig. 8, it shows a case where at a time point t at which input of the slave AC power E is stopped a Time of arrival of monitored value T K A time point (30 ms) before (e.g., from the AC power input stop time point t a Time point of passing 20 ms) t β The user reinserts the plug 14 into the receptacle and the input of AC power E resumes.
The main control unit 36 in this caseThe process flow of (2) is as follows. That is, after the motor 30 is stopped, the number of delays is initialized (n=0) (step S 113 →S R ) Then, the logic values of the SW/AC monitor signal MS and the operation voltage monitor signal MV are checked (step S 102 、S 103 ). Then, immediately after the AC power input is stopped, since ms= "H", mv= "H", the loop process [ C ] is continuously performed immediately ]. Then, when the time T is reached at the monitor value K Time point t before (30 ms) β When the input of the AC power E is restarted, the loop processing [ C]Checking the SW/AC monitor signal MS (step S) 103 →S 104c →S 105 →S 102 ). Thus, since the SW/AC monitoring signal MS is also at time t β Changes from H potential to L potential, thus enters the cyclic process [ A ]]Thereafter, remain in the recycling process [ A ]]And (3) inner part.
As described above, in the present embodiment, 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, and gives the operating voltage V to the operating voltage monitoring unit 48 CC Voltage potential ratio of (2) to a predetermined monitor value V K In a state of low monitoring information (mv= "L"), even if the SW/AC monitoring section 46 gives monitoring information (ms= "H" → "L") that has started or restarted inputting AC power from the AC power source 34 to the power supply line 35, the motor 30 is not started.
Thus, during the grinding process with the electric belt grinder, when the plug 14 is pulled out from the socket against the user's intention, the motor 30 is not started even if the plug 14 is inserted back into the socket in a hassle. The same is true even if the AC power source 34 suddenly fails and immediately is powered back up during the grinding process. In this case, the user can restart the motor 30 by temporarily turning off the switch 22 and then turning on the switch 22 again.
When the restarting of the motor 30 is prevented as described above, the main control unit 36 causes the green LED 94G to blink at a low speed, for example, to prompt the user to operate the switch 22, by the warning of the display unit 24.
Incidentally, as a comparative example, the operation is removed from the motor control device in the present embodimentIn the case of the voltage monitor 48, the control flow of the main control 36 is as shown in fig. 9, and the voltage level or logic value of each part is changed as shown in fig. 10. In this case, the control flow of the main control unit 36 does not include a step of checking the monitoring information (operation voltage monitoring signal MV) from the operation voltage monitoring unit (48) (step S) 103 ) Delay related process (step S) R 、S F 、S P ) Cycle processing [ B]、[C]For example, the main control unit 36 controls the start and stop of the motor 30 based on only the monitoring information (SW/AC monitoring signal MS) from the SW/AC monitoring unit 46. For this reason, when the input of the AC power E is suddenly stopped and immediately restarted during the grinding process (time point t c ) The SW/AC monitor signal MS changes from the H potential to the L potential, and the main control section 36 restarts the motor 30 in response thereto (step S 106 →S 109 ). However, such restarting is not intended by the user, and is dangerous to the user or surrounding people, and is undesirable from the viewpoint of work.
Other embodiments or modifications
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments. In the specific embodiments, various modifications and changes can be made by those skilled in the art without departing from the technical spirit and scope of the present invention.
For example, in the above embodiment, the control flow (fig. 4) of the main control unit 36 may be modified to be as shown in fig. 11. In this modification example or embodiment 2, the delay initialization step is omitted (step S R ) A delay time checking step (step S) P ) Cycle processing [ C]Instead, the SW/AC monitoring signal review process is added (step S G ) Circulation process [ F]. Here, the delay step (step S F ) Delay time T in (a) P Is set to be equal to or slightly larger than the monitor value arrival time T K (30 ms) of the value (e.g., 30-35 ms). The control flow of this embodiment can also perform the same operations as those of fig. 7 and 8.
That is, in the case of fig. 7, at a time point t at which input of the slave AC power E is stopped a Time delay time T P During the period of time of arrival T of the monitored value K (30 ms) and the operating voltage monitor signal MV changes from the H potential to the L potential. Thus, when the delay time T is elapsed P When the operation voltage monitor signal MV is checked later, since mv= "L", the loop processing [ B ] is entered](step S) 103 →S 104b →S 102 →S F →S 103 →S 104b Carrying out the process. Then, when at the time point t thereafter c When the input of the AC power E is restarted, the SW/AC monitoring signal MS is at the L potential, and thus the loop process [ A ] is entered](step S) 102 →S 104a →S 102 →.cndot.) after which it remains in recycle process [ A ]]Is a kind of medium.
In addition, in the case of fig. 8, at a time point t at which input of the slave AC power E is stopped a Time delay time T P During (a) at time point t β The input of the AC power E is restarted, although the operation voltage monitor signal MV changes from the L potential to the H potential (step S 103 ) However, since the SW/AC monitoring signal MS is at L potential, the signal is processed by the loop process [ F]Enter loop processing [ A ]](step S) G →S 104d →S 102 After which the recycle treatment [ A ] remains]Is a kind of medium.
The operating voltage generating circuit 40 may generate a plurality of types of operating voltages for circuits surrounding the main control unit 36. In this case, the operating voltage monitor 48 may monitor one of the plurality of types of operating voltages, typically the voltage potential of the operating voltage supplied to the main control unit 36. The external power source 34 is not limited to a single-phase commercial ac power source, and may be a single-phase or three-phase ac power source having an arbitrary frequency, or may be a dc power source. Therefore, the operating voltage generating circuit 40 is not limited to a single-phase ac/dc conversion circuit, and may be a three-phase ac/dc conversion 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 any motor. In the SW/AC monitoring section 46, the high-speed current detection section can be configured by using a photocoupler as in the above-described embodiment, but a relay or the like may be used instead of the photocoupler, for example.
The electric belt grinder in the above embodiment is an example of the electric tool of the present invention, and the present invention is applicable to any electric tool using a motor for external power supply of a power source, such as an electric chamfering machine, a disc grinder, a peeling machine, a cutting machine, and a punching machine. The motor control device of the present invention is not limited to an electric tool, and is applicable to any electric appliance using a motor for an external power supply system of a power source.
Description of the reference numerals
1. Electric belt grinder
22. Switch
30. Motor with a motor housing
32. Motor control device
34 AC power supply
36. Main control part
38. Motor control circuit
40. Operation voltage generation circuit
46 SW/AC monitoring part
48. Operation voltage monitor
78. Bidirectional thyristor
88. Photoelectric coupler

Claims (18)

1. A motor control device for controlling the operation of a motor that rotates upon receiving power from an external power source, comprising:
a switch provided in electrical series with the motor with respect to the external power source, movable in a manual operation manner between an on position for indicating start of the motor and an off position for indicating stop of the motor;
an operating voltage generating circuit that receives power from the external power supply and outputs an operating voltage of direct current, wherein the operating voltage gradually decreases from a rated value with a constant time constant when the input of power from the external power supply is stopped; and
A 1 st monitoring unit that monitors a state of the switch or a state of a power supply line between the switch and the motor, and generates a 1 st monitoring signal indicating whether or not power is supplied from the external power source to the power supply line,
the motor control device is characterized by comprising:
a 2 nd monitor unit that receives the operation voltage from the operation voltage generation circuit and monitors the operation voltage, and generates a 2 nd monitor signal indicating whether the voltage potential of the operation voltage is higher or lower than a preset monitor value; and
and a control unit that operates at the operation voltage and controls the start and stop of the motor based on the information of the 1 st monitor signal and the information of the 2 nd monitor signal.
2. The motor control device according to claim 1, wherein,
the 1 st monitor unit includes:
a branch circuit electrically connected in parallel with the motor at a rear stage of the switch when viewed from the external power source; and
and a current detection unit that detects whether or not a current flows to the branch circuit.
3. The motor control device according to claim 2, wherein,
the current detection section has a photocoupler provided to the branch circuit,
The phototransistor of the photocoupler has a 1 st terminal and a 2 nd terminal, the 1 st terminal is connected to the voltage supply terminal of the operation voltage via a resistor, the 2 nd terminal is connected to a ground potential terminal, and the 1 st monitor signal is obtained at the 1 st terminal.
4. The motor control device according to claim 3, wherein,
the 1 st monitor signal is generated as a binary signal having a 1 st threshold value set between a rated value of the operating voltage and a ground potential and a 2 nd threshold value lower than the 1 st threshold value,
the control unit determines that the 1 st monitor signal has a 1 st logic value when the voltage potential of the 1 st monitor signal is higher than the 1 st threshold value, and determines that the 1 st monitor signal has a 2 nd logic value when the voltage potential of the 1 st monitor signal is lower than the 2 nd threshold value.
5. The motor control device according to claim 4, wherein,
in a state where the 2 nd monitor signal indicates that the voltage potential of the operation voltage is higher than the monitor value, the control section starts the motor when the 1 st monitor signal changes from the 1 st logic value to the 2 nd logic value,
In a state where the 2 nd monitor signal indicates that the voltage potential of the operating voltage is higher than the monitor value, the control unit stops the motor when the 1 st monitor signal changes from the 2 nd logic value to the 1 st logic value.
6. The motor control device according to claim 5, wherein,
in a state where the 2 nd monitor signal indicates that the voltage potential of the operation voltage is lower than the monitor value, the control section does not start the motor even if the 1 st monitor signal changes from the 1 st logic value to the 2 nd logic value.
7. The motor control device according to claim 5, wherein,
the monitor value is set such that, when the switch is turned on and the power supply line is stopped from being supplied with power from the external power source, the operating voltage is lower than the monitor value until the voltage potential of the 1 st monitor signal is lower than the threshold value.
8. The motor control device according to any one of claims 5 to 7, wherein,
the 2 nd monitor unit generates the 2 nd monitor signal at a 1 st logic value when the voltage potential of the operation voltage is higher than the monitor value, and generates the 2 nd monitor signal at a 2 nd logic value when the voltage potential of the operation voltage is lower than the monitor value.
9. The motor control device according to claim 8, wherein,
as long as the 2 nd monitor signal has the 2 nd logic value, the control section does not start the motor regardless of the value of the 1 st monitor signal.
10. The motor control device according to claim 1, wherein,
immediately after stopping the motor, the control unit maintains the stopped state of the motor until a predetermined delay time elapses from the time of stopping the motor, regardless of the value of the 1 st monitor signal or the 2 nd monitor signal.
11. The motor control device according to claim 10, wherein,
the delay time is set to be the same time as or slightly longer than a time required for the voltage potential of the operation voltage to drop from the rated value to the monitor value when the power supply line is stopped from being supplied with the electric power from the external power source in the on state of the switch.
12. The motor control device according to claim 1, wherein,
immediately after stopping the motor, the control unit repeatedly checks the 1 st monitor signal and the 2 nd monitor signal a predetermined number of times with a predetermined delay time.
13. The motor control device according to claim 12, wherein,
The delay time is set to be shorter than a time required for the voltage potential of the operation voltage to drop from a rated value to the monitor value.
14. The motor control device according to claim 1, wherein,
further comprising a switching element electrically connected in series with the motor and the switch with respect to the external power source,
the control unit controls the switching element to switch at a predetermined frequency, thereby controlling the rotation of the motor, and turns off the switching element when the motor is stopped.
15. The motor control device according to claim 1, wherein,
the external power supply is an alternating current power supply,
the operating voltage generating circuit has an AC/DC converting circuit for converting AC power inputted from the AC power supply into DC power,
the ac/dc conversion circuit has a capacitor in an output section thereof, and outputs a charging voltage of the capacitor as the operating voltage.
16. A motor control device for controlling the operation of a motor that rotates upon receiving power from an external power source, comprising:
a switch provided in electrical series with the motor with respect to the external power source, movable in a manual operation manner between an on position for indicating start of the motor and an off position for indicating stop of the motor;
An operating voltage generating circuit that receives power from the external power supply and outputs an operating voltage of direct current, wherein the operating voltage gradually decreases from a rated value with a constant time constant when the input of power from the external power supply is stopped; and
a 1 st monitoring unit that monitors a state of the switch or a state of a power supply line between the switch and the motor,
the motor control device is characterized by comprising:
a 2 nd monitoring unit that inputs the operation voltage from the operation voltage generating circuit and monitors whether a voltage potential of the operation voltage is higher or lower than a preset monitoring value; and
a control unit that operates at the operation voltage and controls start and stop of the motor based on monitoring information from the 1 st monitoring unit and the 2 nd monitoring unit,
when the 1 st monitor gives monitoring information that the switch has been switched from an off state to an on state in a state in which the 2 nd monitor gives monitoring information that the voltage potential of the operating voltage is higher than the monitoring value, the control unit starts the motor in response to the monitoring information from the 1 st monitor;
When the 1 st monitoring unit gives monitoring information that the power input from the external power source to the power supply line has been cut off in a state where the 2 nd monitoring unit gives monitoring information that the voltage potential of the operating voltage is higher than the monitoring value, the control unit stops the motor in response to the monitoring information from the 1 st monitoring unit;
in a state where the 2 nd monitoring unit gives monitoring information that the voltage potential of the operating voltage is lower than the monitoring value, the control unit does not start the motor even if the 1 st monitoring unit gives monitoring information that the power input from the external power source to the power supply line has started or restarted.
17. A power tool, comprising:
a main body;
a movable tool mounted to the main body to perform a certain movement;
a motor provided in the main body, for receiving supply of electric power from an external power source and driving the tool;
a motor control device provided in the main body and configured to receive power from the external power source and control an operation of the motor, the motor control device including a switch provided in electrical series with the motor with respect to the external power source, an operation voltage generating circuit that is configured to receive power from the external power source and output an operation voltage of direct current, and a 1 st monitor that is configured to monitor a state of the switch or a state of a power supply line between the switch and the motor and generate a 1 st monitor signal indicating whether or not to supply power from the external power source to the power supply line when the input of power from the external power source is stopped, the 1 st monitor being configured to manually move between an on position for instructing start of the motor and an off position for instructing stop of the motor,
The motor control device is characterized in that the motor control device comprises:
a 2 nd monitor unit that receives the operation voltage from the operation voltage generation circuit and monitors the operation voltage, and generates a 2 nd monitor signal indicating whether the voltage potential of the operation voltage is higher or lower than a preset monitor value; and
and a control unit that operates at the operation voltage and controls the start and stop of the motor based on the information of the 1 st monitor signal and the information of the 2 nd monitor signal.
18. A power tool, comprising:
a main body;
a movable tool mounted to the main body to perform a certain movement;
a motor provided in the main body, for receiving supply of electric power from an external power source and driving the tool;
a motor control device provided in the main body and configured to receive power from the external power source and control an operation of the motor, the motor control device including a switch provided in electrical series with the motor with respect to the external power source and manually movable between an on position for instructing start of the motor and an off position for instructing stop of the motor, an operation voltage generating circuit that receives power from the external power source and outputs an operation voltage of direct current, the operation voltage gradually decreasing from a rated value by a predetermined time constant when the input of power from the external power source is stopped, and a 1 st monitoring unit that monitors a state of the switch or a state of a power supply line between the switch and the motor,
The electric tool is characterized by comprising:
a 2 nd monitoring unit that inputs the operation voltage from the operation voltage generating circuit and monitors whether a voltage potential of the operation voltage is higher or lower than a preset monitoring value; and
a control unit that operates at the operation voltage and controls start and stop of the motor based on monitoring information from the 1 st monitoring unit and the 2 nd monitoring unit,
when the 1 st monitor gives monitoring information that the switch has been switched from an off state to an on state in a state in which the 2 nd monitor gives monitoring information that the voltage potential of the operating voltage is higher than the monitoring value, the control unit starts the motor in response to the monitoring information from the 1 st monitor;
when the 1 st monitoring unit gives monitoring information that the power input from the external power source to the power supply line has been cut off in a state where the 2 nd monitoring unit gives monitoring information that the voltage potential of the operating voltage is higher than the monitoring value, the control unit stops the motor in response to the monitoring information from the 1 st monitoring unit;
in a state where the 2 nd monitoring unit gives monitoring information that the voltage potential of the operating voltage is lower than the monitoring value, the control unit does not start the motor even if the 1 st monitoring unit gives monitoring information that the power input from the external power source to the power supply line has started or restarted.
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