WO2019033875A1 - 圆锯 - Google Patents

圆锯 Download PDF

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Publication number
WO2019033875A1
WO2019033875A1 PCT/CN2018/094907 CN2018094907W WO2019033875A1 WO 2019033875 A1 WO2019033875 A1 WO 2019033875A1 CN 2018094907 W CN2018094907 W CN 2018094907W WO 2019033875 A1 WO2019033875 A1 WO 2019033875A1
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WO
WIPO (PCT)
Prior art keywords
circular saw
motor
brushless motor
signal
driving circuit
Prior art date
Application number
PCT/CN2018/094907
Other languages
English (en)
French (fr)
Inventor
丁小刚
段俊雅
尹田田
周慧龙
Original Assignee
南京德朔实业有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 南京德朔实业有限公司 filed Critical 南京德朔实业有限公司
Priority to EP18845591.9A priority Critical patent/EP3666482B1/en
Priority to CN201880003451.7A priority patent/CN109689315B/zh
Publication of WO2019033875A1 publication Critical patent/WO2019033875A1/zh
Priority to US16/791,033 priority patent/US20200230718A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
    • B23D45/16—Hand-held sawing devices with circular saw blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D47/00—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts
    • B23D47/12—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts of drives for circular saw blades
    • 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
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B9/00—Portable power-driven circular saws for manual operation

Definitions

  • the present disclosure relates to the field of power tools, and in particular to a circular saw.
  • the existing circular saw is powered by a power supply to a drive circuit, and the drive circuit drives the motor to operate.
  • power is supplied to the driving circuit through a single direction of the power supply, and the power utilization efficiency is not high.
  • Power utilization efficiency refers to the efficiency of converting the output power of a power supply into mechanical energy.
  • the number of cutting blades of the circular saw can be evaluated by the number of cutting knives per watt.
  • the power reserve per watt hour of the power supply can only support the circular saw to perform the number of cutting knives of 0.8 knives, and the power utilization efficiency is not high.
  • the purpose of the present disclosure is to provide a circular saw, by controlling the motor, in particular, by precise and independent control of the current in the motor, the performance of the circular saw is optimized, and the circular saw is improved. Power utilization efficiency.
  • the present disclosure first provides a circular saw comprising:
  • a bottom plate a casing on which the casing is mounted; a blade cover, the blade cover being coupled to the casing; and a blade shaft for supporting the saw blade in the blade cover;
  • a brush motor the brushless motor being disposed in the casing, comprising a stator and a rotor; a motor shaft driven by a rotor of the brushless motor;
  • a transmission device wherein the transmission device is configured to connect the motor a motor shaft and the saw blade shaft, wherein the transmission device includes a worm gear and a worm that mesh with each other;
  • a drive circuit the drive circuit includes a switch circuit, and the switch circuit is configured to output a drive signal to control the brushless motor a rotor device; a switch device disposed on an outer surface of the casing for generating a switch signal in response to a user operation of the circular saw;
  • the control unit including one or a group of controllers for The drive signal generated by the drive circuit drives the brushless motor; and the battery pack supplies power to the brush
  • the control unit or controller includes a signal processing unit configured to collect a brushless motor bus and/or a phase current, and output a driving signal to the driving circuit after being processed by the signal processing unit, so that the The brushless motor charges the battery pack with a charging current of no more than 50A.
  • control unit further includes a position estimating unit, wherein the position estimating unit is electrically connected to a phase line of the motor, and the calculation is based on the terminal voltage and/or current of the phase line of the brushless motor.
  • the position of the motor rotor is brushed and output to the signal processing unit.
  • the signal processing unit generates the drive signal to drive a rotor of the brushless motor, and the drive signal is generated according to a position of the brushless motor rotor.
  • the stator of the brushless motor is further provided with a position sensor, and the control unit or controller is further electrically connected to the position sensor, and the brush is obtained according to the signal of the position sensor.
  • the position of the rotor of the motor, the drive signal being generated in accordance with the position of the rotor of the brushless motor.
  • the signal processing unit processes the phase current and/or the bus current of the motor, including: according to the phase current and/or the bus current of the motor, according to the obtained position of the rotor of the motor.
  • Generating the driving signal to drive the motor to control the motor to output a sinusoidal current includes: responding to the switching device
  • the signal and/or the operating data of the battery pack generates the driving signal according to the position of the motor rotor according to the phase current and/or the bus current of the motor, and drives the motor to control the motor to output a sinusoidal current.
  • the amplitude and/or direction of the sinusoidal current can be adjusted by the drive signal.
  • the working data of the battery pack includes a battery pack output current and/or a battery pack temperature; and the signal of the switch device includes standby, shutdown, deceleration, or energy recovery.
  • the circular saw further includes a unidirectional conductive component, the switching device is connected between the driving circuit and the battery pack, and the unidirectional conductive component is connected in parallel with the switching device, the single Current is passed from the drive circuit to the battery pack when the conductive element is turned on.
  • the circular saw further includes a diode D1 for feeding current on the brushless motor to the battery pack through the diode D1.
  • the circular saw further includes a diode D1, the diode D1 is connected in parallel with the switching device, and the diode D1 is turned on when the switching device is in an off state to pass the current output by the brushless motor through the diode. D1 is fed back to the battery pack.
  • the signal processing unit processes the drive signal to the driving circuit, so that the brushless motor charges the battery pack with a charging current of 35A to 50A.
  • the signal processing unit processes and outputs a driving signal to the driving circuit, so that the brushless motor charges the battery pack with a charging current of 20A to 35A.
  • the signal processing unit processes the drive signal to the driving circuit, so that the brushless motor charges the battery pack with a charging current of 0A-20A.
  • a circular saw comprising: a brushless motor including a stator and a rotor; a rotor of the motor coupled to a motor shaft; the motor shaft being driven by a rotor of the brushless motor a saw blade shaft for supporting the rotation of the saw blade to perform a cutting operation on the workpiece; a transmission device for connecting the motor shaft to the saw blade shaft; a drive circuit for output driving a signal for controlling operation of the rotor of the brushless motor; a control unit for driving the brushless motor according to a driving signal generated by the driving circuit; and a power source for supplying power to the brushless motor, the driving circuit, and the control unit.
  • the control unit includes a signal processing unit configured to collect a brushless motor bus and/or a phase current, and after being processed by the signal processing unit, output a driving signal to the driving circuit, and the driving circuit controls the
  • the brushless motor outputs a sinusoidal current such that the brushless motor charges the power source with a charging current of no more than 50A.
  • the transmission device includes a worm gear and a worm that mesh with each other.
  • the circular saw further includes a one-way conductive component and a switching device: the switching device is connected between the driving circuit and the power source, and generates a switching signal in response to a user operation on the circular saw
  • the unidirectional conductive element is connected in parallel with the switching device, the unidirectional conductive element is turned on when the switching device is in an off state, and the sinusoidal current output by the motor when the unidirectional conductive element is turned on Returned to the power source by the drive circuit.
  • the circular saw includes a diode D1 for feeding current on the brushless motor to the power source through the diode D1.
  • the circular saw includes a diode D1 and a switching device; the switching device is connected between the driving circuit and the power source, and is configured to generate a switching signal in response to a user operation on the circular saw;
  • the diode D1 is connected in parallel with the switching device, and is turned on when the switching device is in an off state, and the sinusoidal current output by the brushless motor is fed back to the power source by the driving circuit when the diode D1 is turned on.
  • the signal processing unit processes the drive signal to the driving circuit, so that the brushless motor charges the power source with a charging current of 35A to 50A.
  • the signal processing unit processes and outputs a driving signal to the driving circuit, so that the brushless motor charges the power source with a charging current of 20A to 35A.
  • the signal processing unit processes the drive signal to the driving circuit, so that the brushless motor charges the power source with a charging current of 0A-20A.
  • the present disclosure also correspondingly proposes a circular saw comprising: a motor comprising a stator and a rotor; and a transmission operatively coupled to the rotor for driving the saw blade of the circular saw To perform a cutting operation on the workpiece; a driving circuit for outputting a driving signal for controlling the operation of the rotor of the motor; and a switching device for generating a switching signal in response to the operation of the circular saw; And a control unit, configured to generate a driving signal to drive the motor in response to a switching signal of the switching device.
  • the control unit includes a signal processing unit configured to collect a motor bus and/or a phase current, and after processing by the signal processing unit, output a driving signal to the driving circuit, and the driving circuit controls the motor to output a sine
  • the current is such that the motor charges the power source of the circular saw with a charging current of no more than 50A.
  • the circular saw further includes a feedback circuit for feeding back current on the motor to the power supply of the circular saw.
  • the circular saw as described above further comprising a diode D1 for feeding current from the motor to the power supply of the circular saw through the diode D1.
  • the circular saw further includes a one-way conductive element; and when the one-way conductive element is turned on, the current output by the motor is fed back from the one-way conductive element to the power source of the circular saw.
  • phase current and/or bus current of the motor comprises a bus current of the motor, a phase current of the motor, and a current between the poles of the switching element on the switching circuit Any one or combination of them.
  • a circular saw as described above, wherein the transmission comprises a worm gear and a worm that mesh with each other.
  • the circular saw is processed by the signal processing unit to output a driving signal to the driving circuit, so that the motor charges the power of the circular saw with a charging current of 35A to 50A.
  • the circular saw is processed by the signal processing unit to output a driving signal to the driving circuit, so that the motor charges the power of the circular saw with a charging current of 20A to 35A.
  • the circular saw is processed by the signal processing unit to output a driving signal to the driving circuit, so that the motor charges the power of the circular saw with a charging current of 0A-20A.
  • the motor is a brushless DC motor or a permanent magnet synchronous motor.
  • the optional transmission can also include a deceleration structure.
  • the deceleration structure may include a gear structure with different gear ratios, or a belt drive structure configured with different pulley radii.
  • the present disclosure provides another circular saw comprising: a bottom plate; a casing on which the casing is mounted; a blade cover, the blade cover being coupled to the casing; a spool for supporting a saw blade in the blade cover; a brushless motor disposed in the casing, including a stator and a rotor; a motor shaft, the motor shaft being brushless a rotor driving of the motor; a transmission device for connecting the motor shaft and the saw blade shaft, wherein the transmission device includes a worm gear and a worm that mesh with each other; a drive circuit, the drive circuit includes a switch circuit, The switch circuit is configured to output a driving signal to control a rotor operation of the brushless motor; and a switching device disposed on an outer surface of the casing for generating a switch in response to a user operation on the circular saw a control unit comprising: one or a group of controllers for driving the brushless motor according to a driving signal generated by the driving circuit; and a battery pack for supplying power
  • the control unit or controller includes a signal processing unit configured to collect a brushless motor bus and/or a phase current, and output a driving signal to the driving circuit after being processed by the signal processing unit, so that the The brushless motor drives the saw blade to a number of cutting knives of at least 0.9 kns per watt hour.
  • control unit further includes a position estimating unit, and the position estimating unit is electrically connected to a phase line of the motor, which is calculated according to a terminal voltage and/or current of the phase line of the brushless motor.
  • the position of the brushless motor rotor is output to the signal processing unit.
  • the signal processing unit generates the drive signal to drive a rotor of the brushless motor, and the drive signal is generated according to a position of the brushless motor rotor.
  • the stator of the brushless motor is further provided with a position sensor, and the control unit or controller is further electrically connected to the position sensor, and the brush is obtained according to the signal of the position sensor.
  • the position of the rotor of the motor, the drive signal being generated in accordance with the position of the rotor of the brushless motor.
  • the signal processing unit processes the phase current and/or the bus current of the motor, including: according to the phase current and/or the bus current of the motor, according to the obtained position of the rotor of the motor.
  • Generating the driving signal to drive the motor to control the motor to output a sinusoidal current includes: responding to the switching device
  • the signal and/or the operating data of the battery pack generates the driving signal according to the position of the motor rotor according to the phase current and/or the bus current of the motor, and drives the motor to control the motor to output a sinusoidal current.
  • the amplitude and/or direction of the sinusoidal current can be adjusted by the drive signal.
  • the working data of the battery pack includes a battery pack output current and/or a battery pack temperature; and the signal of the switch device includes standby, shutdown, deceleration, or energy recovery.
  • the circular saw further includes a unidirectional conductive component, the switching device is connected between the driving circuit and the battery pack, and the unidirectional conductive component is connected in parallel with the switching device, the single Current is passed from the drive circuit to the battery pack when the conductive element is turned on.
  • the circular saw further includes a diode D1 for feeding current on the brushless motor to the battery pack through the diode D1.
  • the circular saw further includes a diode D1, the diode D1 is connected in parallel with the switching device, and the diode D1 is turned on when the switching device is in an off state to pass the current output by the brushless motor through the diode. D1 is fed back to the battery pack.
  • the driving signal is output to the driving circuit, so that the brushless motor drives the saw blade to have a number of cutting blades of at least 0.9 to 1.0 kns per watt hour. .
  • the signal processing unit processes the drive signal to the driving circuit, so that the brushless motor drives the saw blade to at least 1.0 to 1.2 knives per watt. .
  • the driving signal is output to the driving circuit, so that the brushless motor drives the saw blade to at least 1.2 to 1.4 knives per watt. .
  • the signal processing unit processes the drive signal to the driving circuit, so that the brushless motor drives the saw blade to at least 1.4 to 1.6 knives per watt. .
  • a circular saw comprising: a brushless motor including a stator and a rotor; a rotor of the motor coupled to a motor shaft; the motor shaft being driven by a rotor of the brushless motor a saw blade shaft for supporting the rotation of the saw blade to perform a cutting operation on the workpiece; a transmission device for connecting the motor shaft to the saw blade shaft; a drive circuit for output driving a signal for controlling operation of the rotor of the brushless motor; a control unit for driving the brushless motor according to a driving signal generated by the driving circuit; and a power source for supplying power to the brushless motor, the driving circuit, and the control unit.
  • the control unit includes a signal processing unit configured to collect a brushless motor bus and/or a phase current, and after being processed by the signal processing unit, output a driving signal to the driving circuit, and the driving circuit controls the
  • the brushless motor outputs a sinusoidal current such that the brushless motor drives the saw blade to a number of cutting knives of at least 0.9 kns per watt hour.
  • the transmission device includes a worm gear and a worm that mesh with each other.
  • the circular saw further includes a one-way conductive component and a switching device: the switching device is connected between the driving circuit and the power source, and generates a switching signal in response to a user operation on the circular saw
  • the unidirectional conductive element is connected in parallel with the switching device, the unidirectional conductive element is turned on when the switching device is in an off state, and the sinusoidal current output by the motor when the unidirectional conductive element is turned on Returned to the power source by the drive circuit.
  • the circular saw includes a diode D1 for feeding current on the brushless motor to the power source through the diode D1.
  • the circular saw includes a diode D1 and a switching device; the switching device is connected between the driving circuit and the power source, and is configured to generate a switching signal in response to a user operation on the circular saw;
  • the diode D1 is connected in parallel with the switching device, and is turned on when the switching device is in an off state, and the sinusoidal current output by the brushless motor is fed back to the power source by the driving circuit when the diode D1 is turned on.
  • the driving signal is output to the driving circuit, so that the brushless motor drives the saw blade to have a number of cutting knives of at least 0.9 kn. to 1.0 kn. per watt.
  • the driving signal is output to the driving circuit, so that the brushless motor drives the saw blade to have a number of cutting knives of at least 1.0 kn. to 1.2 kn. per watt.
  • the signal processing unit processes the drive signal to the driving circuit, so that the brushless motor drives the saw blade to at least 1.2 to 1.4 knives per watt.
  • the signal processing unit processes the drive signal to the driving circuit, so that the brushless motor drives the saw blade to have a number of cutting knives of at least 1.4 kn. to 1.6 kn. per watt.
  • the present disclosure also correspondingly proposes a circular saw comprising: a motor comprising a stator and a rotor; and a transmission operatively coupled to the rotor for driving the saw blade of the circular saw To perform a cutting operation on the workpiece; a driving circuit for outputting a driving signal for controlling the operation of the rotor of the motor; and a switching device for generating a switching signal in response to the operation of the circular saw; And a control unit, configured to generate a driving signal to drive the motor in response to a switching signal of the switching device.
  • the control unit includes a signal processing unit configured to collect a motor bus and/or a phase current, and after processing by the signal processing unit, output a driving signal to the driving circuit, and the driving circuit controls the motor to output a sine
  • the current is such that the motor drives the saw blade to a number of cutting knives of at least 0.9 kns per watt hour.
  • the circular saw further includes a feedback circuit for feeding back current on the motor to the power supply of the circular saw.
  • the circular saw as described above further comprising a diode D1 for feeding current from the motor to the power supply of the circular saw through the diode D1.
  • the circular saw further includes a one-way conductive element; and when the one-way conductive element is turned on, the current output by the motor is fed back from the one-way conductive element to the power source of the circular saw.
  • phase current and/or bus current of the motor comprises a bus current of the motor, a phase current of the motor, and a current between the poles of the switching element on the switching circuit Any one or combination of them.
  • a circular saw as described above, wherein the transmission comprises a worm gear and a worm that mesh with each other.
  • the circular saw is processed by the signal processing unit to output a driving signal to the driving circuit, so that the motor drives the saw blade to a number of cutting knives of at least 0.9 kn. to 1.0 kn. per watt.
  • the circular saw is processed by the signal processing unit to output a driving signal to the driving circuit, so that the motor drives the saw blade to at least 1.0 to 1.2 knives per watt.
  • the circular saw is processed by the signal processing unit to output a driving signal to the driving circuit, so that the motor drives the saw blade to at least 1.2 to 1.4 knives per watt.
  • the circular saw is processed by the signal processing unit to output a driving signal to the driving circuit, so that the motor drives the saw blade to at least 1.4 to 1.6 knives per watt.
  • the motor is a brushless DC motor or a permanent magnet synchronous motor.
  • the transmission device may further include a deceleration structure.
  • the deceleration structure may include a gear structure with different gear ratios, or a belt drive structure configured with different pulley radii.
  • the present disclosure also provides a circular saw comprising:
  • a bottom plate a casing on which the casing is mounted; a blade cover, the blade cover being coupled to the casing; and a blade shaft for supporting the saw blade in the blade cover;
  • a brush motor the brushless motor being disposed in the casing, comprising a stator and a rotor; a motor shaft driven by a rotor of the brushless motor;
  • a transmission device wherein the transmission device is configured to connect the motor a motor shaft and the saw blade shaft, wherein the transmission device includes a worm gear and a worm that mesh with each other;
  • a drive circuit the drive circuit includes a switch circuit, and the switch circuit is configured to output a drive signal to control the brushless motor a rotor device; a switch device disposed on an outer surface of the casing for generating a switch signal in response to a user operation of the circular saw;
  • the control unit including one or a group of controllers for The drive signal generated by the drive circuit drives the brushless motor; and the battery pack supplies power to the brush
  • the control unit or controller includes a signal processing unit configured to collect a brushless motor bus and/or a phase current, and output a driving signal to the driving circuit after being processed by the signal processing unit, so that the The brushless motor drives the saw blade to recover at least 0.01 wh of energy during each shutdown of the circular saw.
  • control unit further includes a position estimating unit, wherein the position estimating unit is electrically connected to a phase line of the motor, and the calculation is based on the terminal voltage and/or current of the phase line of the brushless motor.
  • the position of the motor rotor is brushed and output to the signal processing unit.
  • the signal processing unit generates the drive signal to drive a rotor of the brushless motor, and the drive signal is generated according to a position of the brushless motor rotor.
  • the stator of the brushless motor is further provided with a position sensor, and the control unit or controller is further electrically connected to the position sensor, and the brush is obtained according to the signal of the position sensor.
  • the position of the rotor of the motor, the drive signal being generated in accordance with the position of the rotor of the brushless motor.
  • the signal processing unit processes the phase current and/or the bus current of the motor, including: according to the phase current and/or the bus current of the motor, according to the obtained position of the rotor of the motor. Generating the drive signal drives the motor to control the motor to output a sinusoidal current.
  • processing, by the signal processing unit, the phase current and/or the bus current of the motor includes: responding to a signal of the switching device and/or working data of the battery pack, according to a phase current of the motor and/or Or a bus current, generating the driving signal according to the position of the motor rotor, driving the motor to control the motor to output a sinusoidal current.
  • the amplitude and/or direction of the sinusoidal current can be adjusted by the drive signal.
  • the working data of the battery pack includes a battery pack output current and/or a battery pack temperature; and the signal of the switch device includes standby, shutdown, deceleration, or energy recovery.
  • the circular saw further includes a unidirectional conductive component, the switching device is connected between the driving circuit and the battery pack, and the unidirectional conductive component is connected in parallel with the switching device, the single Current is passed from the drive circuit to the battery pack when the conductive element is turned on.
  • the circular saw further includes a diode D1 for feeding current on the brushless motor to the battery pack through the diode D1.
  • the circular saw further includes a diode D1, the diode D1 is connected in parallel with the switching device, and the diode D1 is turned on when the switching device is in an off state to pass the current output by the brushless motor through the diode. D1 is fed back to the battery pack.
  • a circular saw comprising: a brushless motor including a stator and a rotor; a rotor of the motor coupled to a motor shaft; the motor shaft being driven by a rotor of the brushless motor a saw blade shaft for supporting the rotation of the saw blade to perform a cutting operation on the workpiece; a transmission device for connecting the motor shaft to the saw blade shaft; a drive circuit for output driving a signal for controlling operation of the rotor of the brushless motor; a control unit for driving the brushless motor according to a driving signal generated by the driving circuit; and a power source for supplying power to the brushless motor, the driving circuit, and the control unit.
  • the control unit includes a signal processing unit configured to collect a brushless motor bus and/or a phase current, and after being processed by the signal processing unit, output a driving signal to the driving circuit, and the driving circuit controls the
  • the brushless motor outputs a sinusoidal current such that the brushless motor drives the saw blade to recover at least 0.01 wh of energy during each shutdown of the circular saw.
  • the transmission device includes a worm gear and a worm that mesh with each other.
  • the circular saw further includes a one-way conductive component and a switching device: the switching device is connected between the driving circuit and the power source, and generates a switching signal in response to a user operation on the circular saw
  • the unidirectional conductive element is connected in parallel with the switching device, the unidirectional conductive element is turned on when the switching device is in an off state, and the sinusoidal current output by the motor when the unidirectional conductive element is turned on Returned to the power source by the drive circuit.
  • the circular saw includes a diode D1 for feeding current on the brushless motor to the power source through the diode D1.
  • the circular saw includes a diode D1 and a switching device; the switching device is connected between the driving circuit and the power source, and is configured to generate a switching signal in response to a user operation on the circular saw;
  • the diode D1 is connected in parallel with the switching device, and is turned on when the switching device is in an off state, and the sinusoidal current output by the brushless motor is fed back to the power source by the driving circuit when the diode D1 is turned on.
  • the present disclosure also correspondingly proposes a circular saw comprising: a motor comprising a stator and a rotor; and a transmission operatively coupled to the rotor for driving the saw blade of the circular saw To perform a cutting operation on the workpiece; a driving circuit for outputting a driving signal for controlling the operation of the rotor of the motor; and a switching device for generating a switching signal in response to the operation of the circular saw; And a control unit, configured to generate a driving signal to drive the motor in response to a switching signal of the switching device.
  • the control unit includes a signal processing unit configured to collect a motor bus and/or a phase current, and after processing by the signal processing unit, output a driving signal to the driving circuit, and the driving circuit controls the motor to output a sine
  • the current is such that the motor drives the saw blade to recover at least 0.01 wh of energy during each shutdown of the circular saw.
  • the circular saw further includes a feedback circuit for feeding back current on the motor to the power supply of the circular saw.
  • the circular saw as described above further comprising a diode D1 for feeding current from the motor to the power supply of the circular saw through the diode D1.
  • the circular saw further includes a one-way conductive element; and when the one-way conductive element is turned on, the current output by the motor is fed back from the one-way conductive element to the power source of the circular saw.
  • phase current and/or bus current of the motor comprises a bus current of the motor, a phase current of the motor, and a current between the poles of the switching element on the switching circuit Any one or combination of them.
  • a circular saw as described above, wherein the transmission comprises a worm gear and a worm that mesh with each other.
  • the motor is a brushless DC motor or a permanent magnet synchronous motor.
  • the transmission device may further include a deceleration structure.
  • the deceleration structure may include a gear structure with different gear ratios, or a belt drive structure configured with different pulley radii.
  • the present disclosure processes a phase current and/or a bus current of a motor obtained by sampling thereof by a signal processing unit to generate a driving signal, and drives the motor according to the driving signal to cause the motor to output a sinusoidal current.
  • the driving signal generated by the present disclosure can control the flow direction and amplitude of the sinusoidal current on the motor, feed back the current component generated by the motor to the power source, charge the power source, realize energy recovery, and control energy.
  • the current charged to the power supply during the recycling process is no more than 50A, avoiding excessive impact on the power supply, protecting the power supply, and recovering at least 0.01 wh of energy during each shutdown.
  • the power reserve per watt hour of the power supply can support the circular saw to complete the number of cutting knives of at least 0.9 knives. That is, the power utilization efficiency of the present disclosure is improved by at least 1/5 compared to the existing circular saw. That is to say, under the condition that the amount of power supply of the power source is the same, the effective working time of the circular saw of the present disclosure can be extended to 1.2 times or more of the existing circular saw.
  • FIG. 1 is a schematic diagram of an external structure of a first embodiment provided by the present disclosure
  • FIG. 2 is a schematic diagram of a connection relationship of a second embodiment provided by the present disclosure.
  • FIG. 3 is a schematic structural view of a third embodiment provided by the present disclosure.
  • FIG. 4 is a block diagram showing the architecture of a circuit system applied to the first embodiment provided by the present disclosure
  • FIG. 5 is a block diagram of a circuit system architecture applied to a second embodiment provided by the present disclosure.
  • FIG. 6 is a schematic diagram of a control flow in a signal processing unit in a motor control system provided by the present disclosure
  • FIG. 7 is a block diagram showing the architecture of a circuit system applied to a third embodiment provided by the present disclosure.
  • FIG. 8 is a test diagram of motor current during the energy recovery process of the circular saw according to the present disclosure.
  • the present disclosure first provides a circular saw, the specific structure of which includes:
  • the motor is disposed in the casing, including a stator and a rotor; the motor shaft 6 is driven by a rotor of the motor; the transmission device 7
  • the transmission device is configured to connect the motor shaft and the saw blade shaft, and transmit rotational motion of the motor shaft to the saw blade shaft to drive the saw blade to operate;
  • the transmission device may specifically include a speed reduction mechanism, such as intermeshing Worm gear and worm, or gearbox.
  • the worm gear or reduction gearbox may include a gear structure with different gear ratios, or a timing belt transmission structure configured with different timing of the synchronous wheel.
  • the motor is a brushless motor.
  • the operation of the above-mentioned circular saw also depends on the electronic components mounted on the PCB circuit board.
  • the PCB circuit board is housed in the casing 2, as shown in FIG. 4, specifically including: a driving circuit, a control unit and a power supply circuit.
  • the driving circuit includes a switching circuit 8, and may further include a peripheral circuit such as a driving chip to improve the load capacity of the switching circuit 8.
  • the control unit may be specifically implemented by a combination of one or more controllers, and specifically includes a position estimating unit and a signal processing unit 10.
  • the power supply of the circular saw is specifically selected as the battery pack 11, and the battery pack passes through a specific power supply circuit.
  • the embodiment specifically corresponds to DC-DC, and supplies power to the motor, the driving circuit, and the signal processing unit.
  • the electronic component of the circular saw further includes a switching device SW1 and a diode D1.
  • the switch device is disposed on an outer surface of the casing, and connects the driving circuit and the battery pack for generating an electrical signal, specifically a switch signal to the controller, in response to operation of the circular saw.
  • the diode D1 is connected in parallel with the switching device SW1, and the unidirectional conductive element is turned on when the switching device SW1 is in an off state, and the sinusoidal current output by the motor is fed back to the power source via the diode D1.
  • Fig. 1 the control unit, the drive circuit, the motor 5, the power supply circuit and the diode D1 are all closed by the casing 2, and are not exposed to the angle of view of Fig. 1.
  • the control unit, the drive circuit, the motor 5, the power supply circuit and the diode D1 are all closed by the casing 2, and are not exposed to the angle of view of Fig. 1.
  • the driving circuit is specifically electrically connected to the three-phase electrodes U, V, W of the motor 5 to drive the motor to operate.
  • the driving circuit specifically includes a switching circuit 8 for outputting a driving signal to the three-phase electrode of the motor according to the control of the signal processing unit to control the rotor operation of the motor.
  • the driving circuit has an input end, an output end, and a sampling end.
  • the switching circuit 8 includes switching elements VT1, VT2, VT3, VT4, VT5, VT6.
  • the switching elements VT1-VT6 are exemplified by a field effect transistor, and the gate end thereof is used as an input end of the driving circuit, and is electrically connected to a driving signal of the signal processing unit, and each drain or source of the switching element is respectively connected to the motor.
  • the stator is electrically connected.
  • the driving signal specifically includes a Q1 to Q6 six-way signal.
  • the switching elements VT1-VT6 sequentially change the conduction state according to the driving signal outputted by the signal processing unit, thereby changing the voltage state of the battery pack 11 loaded on the winding of the brushless motor, generating an alternating magnetic field, and driving the rotor of the motor to operate.
  • the driving circuit has a plurality of driving states for rotating the brushless motor, and a stator generates a magnetic field in a driving state, and the signal processing unit is configured to output a corresponding control signal according to the rotor rotational position of the motor.
  • the driving circuit is switched to the driving state, so that the magnetic field generated by the stator is rotated to drive the rotor to rotate, thereby driving the brushless motor.
  • the rotor rotational position of the motor in one embodiment of the present disclosure, the phase current of the motor that can be collected by R1 to R3 is calculated by the position estimating unit.
  • the signal processing unit 10 in the electronic component is configured to drive the driving circuit according to an electrical signal of the switching device SW1 on the outer surface of the casing.
  • the signal processing unit includes an input end and a drive signal output end.
  • the above input terminal or the driving signal output terminal can be realized by a dedicated interface hardware or only corresponding pins of the chip.
  • the driving signal output end is connected to the input end of the driving circuit, and the input end of the signal processing unit receives the signal of the switching device and the rotor rotating position of the motor output by the position evaluating unit and the sampling of the phase current of the motor;
  • the signal processing unit is configured to process an operating current of the motor according to a switching signal of the switching device to generate a driving signal.
  • the phase current of the motor is specifically processed to generate a driving signal.
  • the operating current can also be a bus current or a combination thereof with the phase current of the motor.
  • the driving signal is driven by the driving signal output terminal to drive the driving circuit to control the motor to output a sinusoidal current to drive the saw blade.
  • the driving signal may also be generated by the signal processing unit according to the switching signal of the switching device and/or the operating data of the battery pack in the circular saw, and the phase current and/or the bus current.
  • the switching circuit drives the motor to output a sinusoidal current according to the driving signal, whereby the amplitude and/or the flow direction of the sinusoidal current is adjusted according to the driving signal.
  • the signal processing unit is configured to collect a motor bus and/or a phase current, and output a driving signal to the driving circuit after being processed by the signal processing unit, so that the brushless motor can be no more than 50A.
  • the charging current charges the battery pack.
  • the signal processing unit is configured to collect a brushless motor bus and/or a phase current, and further processed by the signal processing unit to output a driving signal to the driving circuit, so that When the brushless motor outputs a sinusoidal current, the brushless motor charges the battery pack with a charging current of no more than 50A.
  • the driving signal outputted by the signal processing unit controls the driving circuit, so that the current generated on the motor is fed back to the power source through the feedback circuit, and the power source is charged to realize energy recovery; preferably, the signal is transmitted.
  • the driving signal outputted by the processing unit controls the driving circuit to cause the motor to output a sinusoidal current, and is fed back to the power source through the feedback circuit to charge the power source to realize energy recovery.
  • the driving signal outputted by the signal processing unit is sent to the driving circuit, and the driving circuit causes the current or the sinusoidal current output by the motor to cause the negative torque generated by the motor to be fed back to the power source through the feedback circuit to charge the power source.
  • the driving circuit causes a current or a sinusoidal current output by the motor to cause a current component of the motor to generate a negative torque to be fed back through the diode D1.
  • Power supply charging the power supply for energy recovery. By recovering the energy, the number of cutting knives that can be completed by the electric energy storage per watt hour of the power supply in the circular saw is improved, and the power utilization efficiency is improved.
  • step S1 the signal processing unit obtains the phase current of the motor through the input end
  • Step S2 calculating the current of the motor by calculating the current by the position estimating unit, and calculating the rotation speed of the motor; performing coordinate transformation on the phase current of the motor through the coordinate transformation unit, specifically including Clark transformation and Park transformation Obtaining the excitation current feedback value id and the torque current feedback value iq;
  • Step S4 the current loop unit, specifically adopting the first regulator and the second regulator in FIG. 6, respectively adjusting the excitation component of the motor according to the excitation current feedback value id and the preset excitation current reference value id*;
  • the torque current feedback value iq and the preset torque current reference value iq* adjust the torque component of the motor; wherein the preset excitation current reference value id* and/or the torque current reference value iq* are passed Step S3, determining, by the controller, the electrical signal generated by the operation of the circular saw, the operating data of the battery pack, and the operating state of the motor to generate a speed control signal; wherein the operation of the circular saw is generated
  • the electrical signal may specifically include standby, stop or deceleration, and may be known by the on/off state of the switching device SW1, that is, the switching signal of the switching device SW1;
  • the operating data of the battery pack includes the battery pack output current and/or the battery pack temperature;
  • the operating state includes the motor position and speed;
  • the current loop unit After the current loop unit adjusts the two components, it outputs to the duty ratio calculation unit, and the duty ratio calculation unit converts the excitation component and the torque component of the motor into the drive signal of the switch circuit 8 connected to the control motor through the step S5.
  • the output of the driving signal output terminal wherein the specific calculation process of the conversion may be performed by performing an inverse Park transformation first, and then implementing the SVPWM calculation or the SPWM calculation.
  • This embodiment is specifically directed to the phase current, but the bus current, or the combination of the phase current and the bus current, can also be replaced by the operating current of the motor in FIG. 6 by the method step shown in FIG. 6, which can be similarly processed to achieve a similar driving signal. .
  • the switching of the switching elements in the switching circuit illustrated by TV1 to TV6 on the upper side of FIG. 4 is controlled to realize power supply to the coils of the respective phases in the motor.
  • the motor outputs a sinusoidal current that drives the motor in the circular saw in accordance with the operation of the circular saw and the operational data of the battery pack to the current direction and magnitude requirements.
  • the drive signal may be specifically designed as duty cycle data, and the drive circuit is controlled by the duty cycle data, in particular, the switch circuit controls the energization time of the inner winding of the motor according to the drive signal, and drives the signal through the drive signal.
  • the windings of the respective phases are turned on to produce a regularly varying magnetic field to drive the rotor of the motor to operate.
  • the drive signal may specifically be the duty cycle data of the motor. In the duty cycle data, the larger the on-time ratio, the greater the magnetic field strength in the motor, and the faster the motor rotor runs. When the motor is running, the motor outputs a sinusoidal current due to the inductive action of its windings.
  • the magnitude and/or flow direction of the sinusoidal current is limited by the switching signal of the switching device SW1 and/or the operational data of the battery pack in the power tool.
  • the signal processing unit in the standby state, the signal processing unit generates the driving signal to drive the motor to output the sinusoidal current amplitude as a standby gear position, and in the standby gear position, the rotational speed of driving the motor to operate is maintained relative to the working state.
  • the signal processing unit When the unit receives the control signal to the electric tool for stopping or decelerating, the signal processing unit generates the driving signal to drive the motor to output the sinusoidal current to decrease the amplitude until the operating data of the battery pack is abnormally eliminated.
  • the abnormality of the operating data of the battery pack includes excessive battery pack output current and/or excessive battery pack temperature.
  • the above control can be set by the excitation current set value id* and the torque current set value iq* according to the electrical signal received by the control interface of the motor and/or the operating data of the battery pack in the power tool.
  • speed regulation requirements including limiting motor current, shutdown, deceleration, energy recovery, no-load low-speed standby, etc.
  • the specific setting steps are as follows to achieve control of the sinusoidal current amplitude and flow direction of the motor running output:
  • the signal processing unit when the signal processing unit knows that the power tool enters a standby state, the signal processing unit generates the driving signal to drive the motor to output an output sinusoidal current amplitude to a standby gear position.
  • the standby state There are several ways to enter the standby state. For example, it can be manually set to enter the standby state by the trigger switch device SW1, or be in a standby state for a short period of time after the default triggering of the working state, and then enter the working state.
  • the absolute value of the excitation current reference value id* is limited, or the absolute value of the torque current reference value iq* is limited, and the drive signal is generated after being converted by the duty ratio calculation unit. Controlling the sinusoidal current amplitude of the standby gear to drive the rotational speed of the motor can thereby control a rotational speed that is less than the sinusoidal current amplitude at the operating state to drive the motor.
  • the signal processing unit receives an abnormality of the working data of the battery pack in the power tool, including when the temperature is too high, the current is too large, or may further include the signal processing unit receiving the power tool entering the stop or deceleration state
  • the signal processing unit generates the driving signal to drive the motor operation output sinusoidal current amplitude to decrease until the operating data of the battery pack is abnormally eliminated.
  • the driving the sinusoidal current amplitude decreasing may be specifically performed by decrementing the torque current feedback value iq and/or the torque current setting value iq*; or by setting the excitation current given value id* vector to a negative direction.
  • Such a setting can cancel the motor magnetic field within the algorithm, thereby reducing the motor power, such as the current output of the battery pack, thereby effectively adjusting the power consumption of the power tool.
  • This direct regulation of the current in the circuit is difficult to achieve in the field of power tools of the conventional technology.
  • the signal processing unit When the signal processing unit receives the power tool to enter a stop or deceleration state, the signal processing unit generates the driving signal to drive the motor to output a sinusoidal current to the battery pack.
  • Such an effect can be specifically controlled by setting the torque current set value iq* vector to a negative direction, and the excitation current set value id* can also be set to 0 at this time.
  • the motor torque is cancelled in the algorithm, thereby reducing the motor driving capability and achieving an effective reduction of the operating speed of the motor.
  • the switch triggered by the stop or deceleration command, SW1 in Fig. 4 can also be placed in the off state while setting the torque current reference value iq* vector to the negative direction.
  • the motor current will be fed back to the battery pack through a unidirectional conductive element, such as diode D1 of FIG. 4, to charge the battery pack.
  • the signal processing unit outputs a driving signal to control the driving circuit, and the driving circuit controls the sinusoidal current output by the motor, thereby controlling the magnitude of the negative torque generated by the sinusoidal current of the motor. Therefore, when the negative torque current component generated by the motor is fed back to the power source through the diode D1, the current that charges the power source can be limited within the current range in which the battery is effectively charged, and the battery is protected and energy recovery is achieved.
  • the signal processing unit may generate a corresponding driving signal by controlling the torque current feedback value iq and/or the torque current reference value iq*, and the driving circuit controls the switching circuit to drive the motor to operate, and further Controlling the magnitude and flow direction of the sinusoidal current output by the motor, so that the converted charging current flows to the battery pack within an acceptable range of the battery pack, thereby achieving effective charging and protecting the battery pack.
  • the charging current :
  • the maximum inrush current (charging current) can be controlled to 6c or less;
  • the maximum inrush current (charging current) can be controlled to 5 c or less;
  • the maximum inrush current (charging current) can be controlled to 4 c or less;
  • a 1p battery pack has a capacity of 2.5Ah, a maximum inrush current 6c corresponding to a current of 15A, a 2p battery pack with a capacity of 2.5Ah, and a maximum inrush current 6c corresponding to a current of 30A.
  • the circular saw with the worm gear structure as the transmission is tested in the energy recovery process to obtain the motor current data indicated by reference numeral 1.
  • the two points between a and b are the impact process of charging current, the impact time of the charging current is within 496ms, and the maximum inrush current is 4.8A.
  • the energy recovered by this charging current corresponds to 0.02 wh.
  • the processing of the phase current and/or the bus current of the motor through the signal processing unit can be practically applied to any electric tool to realize the operation of the inner motor.
  • Control of the output sinusoidal current includes controlling the flow direction and amplitude of the sinusoidal current. Specifically, it is applied to a circular saw or a circular saw. Due to the adjustment of the excitation component and the torque component of the motor by the signal processing unit, the energy consumption level can be dynamically adjusted according to the state of the power tool, and the motor energy can be recovered when needed. Therefore, the utilization rate of electric energy of the electric tool of the present disclosure is significantly improved.
  • the power of the circular saw or the circular saw can recover at least 0.01 wh energy by power control or energy recovery, and the watt hour is utilized in the cutting process.
  • the battery pack capacity achieves a number of cutting knives of 0.9 knives or more.
  • the current charged to the power supply during the control energy recovery process is not more than 50A, it can avoid excessive impact on the power supply and protect the power supply.
  • phase current of the collecting motor is specifically taken as an example.
  • the phase current collection of the motor can be realized by the resistors R1 to R3 connected in series on the three sets of bridge arms composed of the switching elements VT1 to VT6 in the switching circuit shown in the lower side of FIG.
  • the resistors R1 R R3 connected in series on the bridge arm convert the motor phase current into a sampled voltage signal, and the sampled voltage signal is amplified by an amplifier and input to the controller to realize the phase current collection of the motor.
  • the current signal collected by the controller may include any one of the bus current of the motor and the interelectrode current of the switching element on the switch circuit to which the motor is connected, in addition to the phase current in the embodiment. Any combination of any one, any combination or any combination of several. Of course, those skilled in the art can directly perform similar processing through a sampling resistor connected in series on the busbar connected to the lower arm of the switching circuit 8, or directly analyze the inter-electrode current on the switching component such as VT2 through an algorithm, and cooperate with the component. The correction function of the characteristics, or the combination of the above methods, can be analyzed to obtain the operating condition of the motor. Sampling of the motor bus current will be analyzed in the next embodiment.
  • the present disclosure further provides a circular saw, the specific structure of which includes:
  • a motor 5 comprising a stator and a rotor; a motor shaft 6 driven by a rotor of the motor; a saw blade shaft 4 for supporting rotation of the saw blade to perform cutting work on the workpiece; and a transmission device for the transmission Connecting the motor shaft to the saw blade shaft.
  • the operation of the above-mentioned circular saw also depends on the electronic components mounted on the PCB circuit board.
  • the PCB circuit board is mounted on the rear of the motor 5.
  • the PCB circuit board 20 in this embodiment may specifically include: the switch circuit 8 , controllers, position sensors and power circuits.
  • the controller includes a signal processing unit 10.
  • the position sensor is mounted on the stator of the motor 5 for sensing the position of the rotor to output a position signal of the rotor of the motor to the controller.
  • the power supply of the circular saw can be selected as the battery pack 11 or other power supply device, and the power supply passes through a specific power supply circuit.
  • the embodiment corresponds to DC-DC, and supplies power to the motor, the switch circuit, and the signal processing unit.
  • the controller or signal processing unit can be implemented by selecting an appropriate control chip according to the required precision and response time of the circular saw control.
  • the control chip includes a single chip microcomputer (MCU, Microcontroller Unit), an ARM (Advanced RISC Machines) chip, a DSP (Digital Signal Processor), and the like.
  • a switch device SW1 and a unidirectional conductive element D1 are further connected to the PCB circuit board of the circular saw.
  • the switching device connects the drive circuit and the power source for generating a corresponding signal to the controller in response to operation of the circular saw.
  • the unidirectional conductive element D1 may be specifically selected as a diode, a thyristor or the like. Taking a diode as an example, the diode is connected in parallel with the switching device SW1, and the unidirectional conductive element is turned on when the switching device SW1 is in an off state, and is used for feeding back a sinusoidal current output by the motor to the power supply via the diode D1. .
  • the thyristor is implemented in a similar manner to the diode, ensuring that the current between the unidirectionally connected pins in the thyristor is fed back to the power supply.
  • the specific manner of driving the motor 5 by the switch circuit is similar to that of the first embodiment, and details are not described herein.
  • the present embodiment is different from the first embodiment in that the rotor rotational position of the motor can be directly obtained and transmitted to the controller through the position sensor in this embodiment. Therefore, it is not necessary to provide a position estimating unit in the controller in the embodiment.
  • the controller generates a driving signal according to the rotor position of the motor obtained by the position sensor and the bus current obtained by the sampling resistor R4, and sends the driving signal to the driving circuit to switch the driving circuit to the driving state, thereby rotating the magnetic field generated by the stator.
  • the drive of the rotor is driven to drive the brushless motor.
  • the motor outputs a sinusoidal current to drive the saw blade.
  • the driving signal can also be in the same manner as in the first embodiment, by the signal processing unit according to the switching signal of the switching device and/or the operating data of the battery pack in the power tool, and the bus current obtained by sampling. generate.
  • the signal processing unit processes the bus current of the motor to generate a drive signal in detail, and the control of the magnitude and/or direction of the sinusoidal current to the drive signal is similar to that of the previous embodiment.
  • the bus current processing of the motor generates a driving signal
  • the bus current obtained by sampling is used as the operating current of the motor, and the processing procedure of the processing may refer to FIG. 6.
  • the difference from the first embodiment is that the step of recognizing the position and the rotational speed of the motor can be realized by directly acquiring the data of the position sensor in the embodiment by the controller in this embodiment.
  • the phase current and/or bus current of the motor can be processed by the signal processing unit to realize the control of the sinusoidal current of the motor running output in the power tool. Including controlling the flow direction and amplitude of the sinusoidal current. Specifically, it is applied to a circular saw. Due to the adjustment of the excitation component and the torque component of the motor by the signal processing unit, the energy consumption level can be dynamically adjusted according to the state of the circular saw, and the power is supplied to the power source through the unidirectional switching element during the deceleration and shutdown process. Current is introduced to recover the energy of the motor.
  • the driving circuit controls the sinusoidal current output by the motor, thereby controlling the magnitude of the negative torque generated by the sinusoidal current, and realizing the magnitude and direction of the motor current. control.
  • the present disclosure can control the current introduced into the power supply within the range of 50A effective charging current, and can select 0-20A, 20-35A, 35-50A, thereby ensuring charging efficiency and protecting the power supply.
  • the circular saw has significantly improved the utilization rate of electric energy, and specifically, by the power control or the energy recovery, the circular saw has a battery pack capacity per watt hour to achieve a number of cutting knives of 0.9 or more. And to ensure that the current to charge the power supply during each recycling process does not exceed 50A, to avoid excessive impact on the power supply, protect the power supply.
  • this embodiment improves the working ability of the circular saw by 20%. That is to say, with the power supply of the same specification, the circular saw in this embodiment can perform an additional 20% of the cutting operation. This improvement in efficiency is still considerable.
  • the number of cutting knives obtained here is, for example, at least 0.9 knives to 1.0 knives per watt, 1.0 knives to 1.2 knives per watt, 1.2 knives to 1.4 knives per watt, and 1.4 knives to 1.6 knives per watt are obtained by cutting pine.
  • the size of the cut surface is 40mm*200mm.
  • the present disclosure further provides a hand-held power tool, the specific structure of which includes:
  • a motor 5 comprising a stator and a rotor; a transmission 7 operatively coupled to the rotor for transmitting rotational motion of the motor rotor to a tool attachment of the hand-held power tool To drive the tool attachment to operate.
  • Tool accessories here include, but are not limited to, drill bits for electric drills, grinding blades for angle grinders, lifting mechanisms for reciprocating saws, saw blades, saw blades for circular saws, sponges or polishing discs for polishing machines, screw heads for screwdrivers, spirals for wrenches. Slot, impact mechanism, stirrer of the mixer, etc. Therefore, the electric tool described in this embodiment can be corresponding to a circular saw, an electric drill, an angle grind, a reciprocating saw, a polishing machine, a screwdriver, a wrench, a mixer, etc.
  • the operation of the above-mentioned hand-held power tool also depends on the electronic components mounted on the PCB circuit board.
  • the PCB circuit board can be disposed on the rear side of the motor 5, as shown in FIG. 7, specifically including: a driving circuit, a controller and a power supply circuit.
  • the controller includes a position estimating unit and a signal processing unit 10.
  • the power supply of the hand-held power tool supplies power to the motor, the drive circuit, and the signal processing unit through a specific power supply circuit.
  • the power source is specifically DC-DC, and may include a power chip and peripheral circuits thereof.
  • the electronic component of the hand-held power tool further includes a switching device SW1 and a diode D1.
  • the switching device connects the driving circuit and the power source for generating an electrical signal to the controller in response to a user operation of the handheld power tool.
  • the diode D1 is connected in parallel with the switching device SW1.
  • the anode of the diode D1 is connected to the driving circuit, the negative electrode is connected to the power source, and is turned on when the switching device SW1 is in the off state, and the sinusoidal current output by the motor is fed back to the power source.
  • the manner in which the driving circuit drives the motor 5 to operate is similar to that of the above embodiment, and will not be described herein.
  • the signal processing unit generates the rotational position of the rotor of the motor according to the driving signal, and the bus current of the motor collected by the resistor R4 on the bus of the driving circuit is calculated by the position estimating unit. obtain.
  • the position estimation unit calculates the position and rotation speed of the motor by the following steps:
  • Step B1 locking the zero-crossing period of the working current of the motor, calculating the frequency f of the working current of the motor;
  • the working current here specifically refers to the bus current of the motor collected by the resistor R4 on the bus of the driving circuit;
  • the operating current of the motor may further include phase currents and/or bus currents of the motor collected in the above embodiments and combinations thereof, and the processing procedure is similar;
  • Step B3 integration is obtained as described
  • s is the number of sampling points of the motor
  • ⁇ is the angular frequency corresponding to the frequency f of the operating current of the motor.
  • calculating the motor position and rotation speed by the above method can avoid the huge calculation amount caused by the differentiation, save system overhead, and improve the calculation efficiency.
  • the controller generates a driving signal according to the rotor position of the motor calculated by the position estimating unit and the bus current obtained by the sampling resistor R4, and sends a driving signal to the driving circuit to cause the driving circuit to switch the driving state, thereby causing the stator to generate
  • the magnetic field rotates to drive the rotor to rotate, enabling the drive of the brushless motor.
  • the motor outputs a sinusoidal current to drive the saw blade.
  • the driving signal can also be in the same manner as in the first embodiment, by the signal processing unit according to the signal of the switching device SW1 and/or the operating data of the battery pack in the power tool, and the bus current obtained by sampling. generate.
  • the signal processing unit processes the bus current of the motor to generate a drive signal, and the control of the magnitude and/or direction of the sinusoidal current to the drive signal is similar to that of the previous embodiment.
  • the driving signal is generated by the bus current processing of the motor
  • the bus current obtained by sampling is used as the operating current of the motor, and the processing procedure flow can also refer to FIG. 6.
  • the phase current and/or bus current of the motor can be processed by the signal processing unit, and the driving signal is controlled to output the driving circuit through the driving circuit.
  • the sinusoidal current of the motor output is controlled to control the magnitude of the negative torque generated by the motor due to the sinusoidal current.
  • the adjustment of the excitation component and the torque component of the motor by the signal processing unit can dynamically adjust the energy consumption level according to the state of the power tool, and pass through the unidirectional conductive component like the diode D1 to the power supply during the deceleration and shutdown process.
  • Current is introduced.
  • the energy recovered by introducing current to the power source is >0.01 wh.
  • the power tool of the present disclosure significantly improves the utilization of electric energy, specifically, by power control or energy recovery, so that the electric tool of the present disclosure can additionally increase the work by 20% in the case of the power supply of the same specification. Capability, that is, under the same load conditions, the tool life time is extended to 1.2 times.
  • the present disclosure provides a circular saw.
  • the current of the motor in the circular saw can be independently adjusted, and the electric energy generated by the motor is fed back to the power source to optimize the utilization efficiency of the power source. It can make electric tools such as circular saws have better energy consumption characteristics.

Abstract

本公开公开了一种圆锯。本公开所述圆锯包括有控制单元，该控制单元包括信号处理单元，所述信号处理单元设置成采集电机母线和/或相电流，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述电机以不大于50A的充电电流向所述电池包充电。本公开的控制方法，通过优化对电机的相电流和/或母线电流的处理，能够独立调节圆锯内电机的电流，将电机产生的电能回馈至电源，以优化对电源的利用效率。采用本公开的圆锯等电动工具，能耗特性更优，有效工作时间能够延长至现有的1.2倍或以上，整体成本也能够进一步降低，易于小型化封装。

Description

圆锯 技术领域
本公开涉及电动工具领域，具体涉及一种圆锯。
背景技术
现有的圆锯，由电源供电给驱动电路，通过驱动电路驱动电机运转。但目前都是通过电源单方向供电给驱动电路，电源利用效率不高。电源利用效率，指电源输出电能转化成机械能的效率。对应圆锯，即指圆锯的切割刀数，可用每瓦时多少切割刀数来评测。当前，电源每瓦时的电能储备仅能支持圆锯进行0.8刀的切割刀数，电源利用效率并不高。
发明内容
为解决现有技术的不足，本公开的目的在于提供一种圆锯，通过对电机的控制，尤其，通过对电机内电流的精准、独立的控制，实现圆锯性能的优化，提高圆锯的电源利用效率。
为了实现上述目标，本公开采用如下的技术方案：
本公开首先提供一种圆锯，包括：
底板；机壳，所述机壳安装在所述底板上；锯片罩，所述锯片罩与所述机壳连接；锯片轴，用于在所述锯片罩内支持锯片；无刷电机，所述无刷电机设置于所述机壳内，包括定子和转子；电机轴，所述电机轴由所述无刷电机的转子驱动；传动装置，所述传动装置用于连接所述电机轴与所述锯片轴，其中所述传动装置包括相互啮合的蜗轮和蜗杆；驱动电路，所述驱动电路包括开关电路，所述开关电路用于输出驱动信号以控制所述无刷电机的转子运转；开关装置，所述开关装置设置于所述机壳外表面，用于响应用户对所述圆锯的操作，产生开关信号；控制单元，包括一个或一组控制器，用于根据所述驱动电路产生的驱动信号驱动所述无刷电机；和电池包，为所述无刷电机、驱动电路、控制单元供电。其中，所述控制单元或控制器包括信号处理单元，所述信号处理单元设置成采集无刷电机母线和/或相电流，经信号处理单元处理后输出驱动信 号给所述驱动电路，使得所述无刷电机以不大于50A的充电电流向所述电池包充电。
可选的，上述圆锯中，所述控制单元进一步包括位置估算单元，位置估算单元与电机的相线电连接，其根据所述无刷电机相线上的端电压和/或电流计算获得无刷电机转子的位置并输出至所述信号处理单元。所述信号处理单元产生所述驱动信号，驱动所述无刷电机的转子，所述驱动信号根据所述的无刷电机转子的位置产生。
可选的，上述圆锯中，所述无刷电机的定子还设有位置传感器，所述控制单元或控制器进一步与所述位置传感器电性连接，其根据所述位置传感器的信号得到无刷电机转子的位置，所述驱动信号根据所述的无刷电机转子的位置产生。
可选的，上述的圆锯中，信号处理单元对所述电机的相电流和/或母线电流进行处理包括：根据电机的相电流和/或母线电流，按照所得到的所述电机转子的位置生成所述驱动信号驱动所述电机，以控制所述电机输出正弦电流；可选的，所述信号处理单元对所述电机的相电流和/或母线电流进行处理包括：响应所述开关装置的信号和/或所述电池包的工作数据，根据电机的相电流和/或母线电流，按照所述电机转子的位置生成所述驱动信号，驱动所述电机，以控制所述电机输出正弦电流。其中，正弦电流的幅值和/或流向可通过所述驱动信号调节。其中，所述电池包的工作数据包括电池包输出电流和/或电池包温度；所述开关装置的信号包括待机、停机、减速或能量回收。
可选的，上述的圆锯中还包括单向导电元件，所述开关装置连接在所述驱动电路与所述电池包之间，所述单向导电元件与所述开关装置并联，所述单向导电元件导通时电流由所述驱动电路流向所述电池包。
可选的，上述的圆锯中还包括二极管D1，用于将无刷电机上电流通过二极管D1回馈至电池包。
可选的，上述的圆锯中还包括二极管D1，所述二极管D1与开关装置并联，所述二极管D1在所述开关装置处于断开状态时导通，以将无刷电机输出的电流经二极管D1回馈至电池包。
可选的，上述的圆锯中，经信号处理单元处理后输出驱动信号给所述驱动 电路，使得所述无刷电机以35A～50A的充电电流向所述电池包充电。
可选的，上述的圆锯中，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机以20A～35A的充电电流向所述电池包充电。
可选的，上述的圆锯中，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机以0A～20A的充电电流向所述电池包充电。
同时，本公开还提供一种圆锯，包括：无刷电机，所述无刷电机包括定子和转子；所述电机的转子连接有电机轴；所述电机轴由所述无刷电机的转子驱动；锯片轴，用于支持锯片转动以对工件进行切割作业；传动装置，所述传动装置用于连接所述电机轴至所述锯片轴；驱动电路，所述驱动电路用于输出驱动信号以控制所述无刷电机的转子运转；控制单元，用于根据所述驱动电路产生的驱动信号驱动所述无刷电机；以及电源，为所述无刷电机、驱动电路、控制单元供电。其中，所述控制单元包括信号处理单元：所述信号处理单元设置成采集无刷电机母线和/或相电流，经信号处理单元处理后，输出驱动信号给所述驱动电路，驱动电路控制所述无刷电机输出正弦电流，使得所述无刷电机以不大于50A的充电电流向所述电源充电。
可选的，上述的圆锯中，所述传动装置包括相互啮合的蜗轮和蜗杆。
可选的，上述的圆锯还包括单向导电元件和开关装置：所述开关装置连接在所述驱动电路与所述电源之间，用于响应用户对所述圆锯的操作，产生开关信号；所述单向导电元件与所述开关装置并联，所述单向导电元件在所述开关装置处于断开状态时导通，所述单向导电元件导通时将所述电机输出的正弦电流由所述驱动电路回馈至所述电源。
可选的，上述圆锯中，包括有二极管D1，用于将无刷电机上电流通过二极管D1回馈至电源。
可选的，上述圆锯中，包括二极管D1和开关装置；所述开关装置连接在所述驱动电路与所述电源之间，用于响应用户对所述圆锯的操作，产生开关信号；所述二极管D1与所述开关装置并联，在所述开关装置处于断开状态时导通，所述二极管D1导通时将所述无刷电机输出的正弦电流由所述驱动电路回馈至所述电源。
可选的，上述圆锯中，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机以35A～50A的充电电流向所述电源充电。
可选的，上述圆锯中，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机以20A～35A的充电电流向所述电源充电。
可选的，上述圆锯中，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机以0A～20A的充电电流向所述电源充电。
同时，本公开还对应地提出一种圆锯，包括：电机，所述电机包括定子和转子；以及传动装置，所述传动装置可操作地与所述转子联接，驱动所述圆锯的锯片以对工件进行切割作业；驱动电路，所述驱动电路用于输出驱动信号以控制所述电机的转子运转；开关装置，所述开关装置用于响应对所述圆锯的操作，产生开关信号；控制单元，用于响应所述开关装置的开关信号产生驱动信号驱动所述电机。其中，所述控制单元包括信号处理单元，所述信号处理单元设置成采集电机母线和/或相电流，经信号处理单元处理后输出驱动信号给所述驱动电路，驱动电路控制所述电机输出正弦电流，使得所述电机以不大于50A的充电电流向所述圆锯的电源充电。
可选的，所述圆锯还包括反馈电路，所述反馈电路用于将电机上电流回馈至所述的圆锯的电源。
可选的，如上所述的圆锯，其中，还包括二极管D1，用于将电机上电流通过二极管D1回馈至所述的圆锯的电源。
可选的，上述的圆锯，其中还包括单向导电元件；所述单向导电元件导通时将电机输出的电流由所述单向导电元件回馈至所述的圆锯的电源。
可选的，如上所述的圆锯，其中，所述电机的相电流和/或母线电流包括所述电机的母线电流、所述电机的相电流、所述开关电路上开关元件的极间电流中的任意一种或组合。
可选的，如上所述的圆锯，其中，所述传动装置包括相互啮合的蜗轮和蜗杆。
可选的，上述的圆锯，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述电机以35A～50A的充电电流向所述圆锯的电源充电。
可选的，上述的圆锯，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述电机以20A～35A的充电电流向所述圆锯的电源充电。
可选的，上述的圆锯，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述电机以0A～20A的充电电流向所述圆锯的电源充电。
可选的，所述电机为无刷直流电机或者永磁同步电机。
可选的所述传动装置还可包括有减速结构。减速结构可包括配有不同齿数比的齿轮结构，或配置不同皮带轮半径的皮带传动结构。
同时，本公开还提供另一种提供一种圆锯，包括：底板；机壳，所述机壳安装在所述底板上；锯片罩，所述锯片罩与所述机壳连接；锯片轴，用于在所述锯片罩内支持锯片；无刷电机，所述无刷电机设置于所述机壳内，包括定子和转子；电机轴，所述电机轴由所述无刷电机的转子驱动；传动装置，所述传动装置用于连接所述电机轴与所述锯片轴，其中所述传动装置包括相互啮合的蜗轮和蜗杆；驱动电路，所述驱动电路包括开关电路，所述开关电路用于输出驱动信号以控制所述无刷电机的转子运转；开关装置，所述开关装置设置于所述机壳外表面，用于响应用户对所述圆锯的操作，产生开关信号；控制单元，包括一个或一组控制器，用于根据所述驱动电路产生的驱动信号驱动所述无刷电机；和电池包，为所述无刷电机、驱动电路、控制单元供电。其中，所述控制单元或控制器包括信号处理单元，所述信号处理单元设置成采集无刷电机母线和/或相电流，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少0.9刀的切割刀数。
可选的的，上述圆锯中，所述控制单元进一步包括位置估算单元，位置估算单元与电机的相线电连接，其根据所述无刷电机相线上的端电压和/或电流计算获得无刷电机转子的位置并输出至所述信号处理单元。所述信号处理单元产生所述驱动信号，驱动所述无刷电机的转子，所述驱动信号根据所述的无刷电机转子的位置产生。
可选的，上述圆锯中，所述无刷电机的定子还设有位置传感器，所述控制单元或控制器进一步与所述位置传感器电性连接，其根据所述位置传感器的信号得到无刷电机转子的位置，所述驱动信号根据所述的无刷电机转子的位置产生。
可选的，上述的圆锯中，信号处理单元对所述电机的相电流和/或母线电流进行处理包括：根据电机的相电流和/或母线电流，按照所得到的所述电机转子的位置生成所述驱动信号驱动所述电机，以控制所述电机输出正弦电流；可选的，所述信号处理单元对所述电机的相电流和/或母线电流进行处理包括：响应所述开关装置的信号和/或所述电池包的工作数据，根据电机的相电流和/或母线电流，按照所述电机转子的位置生成所述驱动信号，驱动所述电机，以控制所述电机输出正弦电流。其中，正弦电流的幅值和/或流向可通过所述驱动信号调节。其中，所述电池包的工作数据包括电池包输出电流和/或电池包温度；所述开关装置的信号包括待机、停机、减速或能量回收。
可选的，上述的圆锯中还包括单向导电元件，所述开关装置连接在所述驱动电路与所述电池包之间，所述单向导电元件与所述开关装置并联，所述单向导电元件导通时电流由所述驱动电路流向所述电池包。
可选的，上述的圆锯中还包括二极管D1，用于将无刷电机上电流通过二极管D1回馈至电池包。
可选的，上述的圆锯中还包括二极管D1，所述二极管D1与开关装置并联，所述二极管D1在所述开关装置处于断开状态时导通，以将无刷电机输出的电流经二极管D1回馈至电池包。
可选的，上述的圆锯中，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少0.9刀～1.0刀的切割刀数。
可选的，上述的圆锯中，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少1.0刀～1.2刀的切割刀数。
可选的，上述的圆锯中，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少1.2刀～1.4刀的切割刀数。
可选的，上述的圆锯中，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少1.4刀～1.6刀的切割刀数。
同时，本公开还提供一种圆锯，包括：无刷电机，所述无刷电机包括定子和转子；所述电机的转子连接有电机轴；所述电机轴由所述无刷电机的转子驱动；锯片轴，用于支持锯片转动以对工件进行切割作业；传动装置，所述传动 装置用于连接所述电机轴至所述锯片轴；驱动电路，所述驱动电路用于输出驱动信号以控制所述无刷电机的转子运转；控制单元，用于根据所述驱动电路产生的驱动信号驱动所述无刷电机；以及电源，为所述无刷电机、驱动电路、控制单元供电。其中，所述控制单元包括信号处理单元：所述信号处理单元设置成采集无刷电机母线和/或相电流，经信号处理单元处理后，输出驱动信号给所述驱动电路，驱动电路控制所述无刷电机输出正弦电流，使得所述无刷电机带动所述锯片达每瓦时至少0.9刀的切割刀数。
可选的，上述的圆锯中，所述传动装置包括相互啮合的蜗轮和蜗杆。
可选的，上述的圆锯还包括单向导电元件和开关装置：所述开关装置连接在所述驱动电路与所述电源之间，用于响应用户对所述圆锯的操作，产生开关信号；所述单向导电元件与所述开关装置并联，所述单向导电元件在所述开关装置处于断开状态时导通，所述单向导电元件导通时将所述电机输出的正弦电流由所述驱动电路回馈至所述电源。
可选的，上述圆锯中，包括有二极管D1，用于将无刷电机上电流通过二极管D1回馈至电源。
可选的，上述圆锯中，包括二极管D1和开关装置；所述开关装置连接在所述驱动电路与所述电源之间，用于响应用户对所述圆锯的操作，产生开关信号；所述二极管D1与所述开关装置并联，在所述开关装置处于断开状态时导通，所述二极管D1导通时将所述无刷电机输出的正弦电流由所述驱动电路回馈至所述电源。
可选的，上述圆锯中，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少0.9刀～1.0刀的切割刀数。
可选的，上述圆锯中，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少1.0刀～1.2刀的切割刀数。
可选的，上述圆锯中，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少1.2刀～1.4刀的切割刀数。
可选的，上述圆锯中，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少1.4刀～1.6刀的切割刀数。
同时，本公开还对应地提出一种圆锯，包括：电机，所述电机包括定子和转子；以及传动装置，所述传动装置可操作地与所述转子联接，驱动所述圆锯的锯片以对工件进行切割作业；驱动电路，所述驱动电路用于输出驱动信号以控制所述电机的转子运转；开关装置，所述开关装置用于响应对所述圆锯的操作，产生开关信号；控制单元，用于响应所述开关装置的开关信号产生驱动信号驱动所述电机。其中，所述控制单元包括信号处理单元，所述信号处理单元设置成采集电机母线和/或相电流，经信号处理单元处理后输出驱动信号给所述驱动电路，驱动电路控制所述电机输出正弦电流，使得所述电机带动所述锯片达每瓦时至少0.9刀的切割刀数。
可选的，所述圆锯还包括反馈电路，所述反馈电路用于将电机上电流回馈至所述的圆锯的电源。
可选的，如上所述的圆锯，其中，还包括二极管D1，用于将电机上电流通过二极管D1回馈至所述的圆锯的电源。
可选的，上述的圆锯，其中还包括单向导电元件；所述单向导电元件导通时将电机输出的电流由所述单向导电元件回馈至所述的圆锯的电源。
可选的，如上所述的圆锯，其中，所述电机的相电流和/或母线电流包括所述电机的母线电流、所述电机的相电流、所述开关电路上开关元件的极间电流中的任意一种或组合。
可选的，如上所述的圆锯，其中，所述传动装置包括相互啮合的蜗轮和蜗杆。
可选的，上述的圆锯，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述电机带动所述锯片达每瓦时至少0.9刀～1.0刀的切割刀数。
可选的，上述的圆锯，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述电机带动所述锯片达每瓦时至少1.0刀～1.2刀的切割刀数。
可选的，上述的圆锯，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述电机带动所述锯片达每瓦时至少1.2刀～1.4刀的切割刀数。
可选的，上述的圆锯，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述电机带动所述锯片达每瓦时至少1.4刀～1.6刀的切割刀数。
可选的，所述电机为无刷直流电机或者永磁同步电机。
可选的，所述传动装置还可包括有减速结构。减速结构可包括配有不同齿数比的齿轮结构，或配置不同皮带轮半径的皮带传动结构。
本公开还提供一种圆锯，包括：
底板；机壳，所述机壳安装在所述底板上；锯片罩，所述锯片罩与所述机壳连接；锯片轴，用于在所述锯片罩内支持锯片；无刷电机，所述无刷电机设置于所述机壳内，包括定子和转子；电机轴，所述电机轴由所述无刷电机的转子驱动；传动装置，所述传动装置用于连接所述电机轴与所述锯片轴，其中所述传动装置包括相互啮合的蜗轮和蜗杆；驱动电路，所述驱动电路包括开关电路，所述开关电路用于输出驱动信号以控制所述无刷电机的转子运转；开关装置，所述开关装置设置于所述机壳外表面，用于响应用户对所述圆锯的操作，产生开关信号；控制单元，包括一个或一组控制器，用于根据所述驱动电路产生的驱动信号驱动所述无刷电机；和电池包，为所述无刷电机、驱动电路、控制单元供电。其中，所述控制单元或控制器包括信号处理单元，所述信号处理单元设置成采集无刷电机母线和/或相电流，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片在所述圆锯每次停机过程中回收至少0.01wh能量。
可选的，上述圆锯中，所述控制单元进一步包括位置估算单元，位置估算单元与电机的相线电连接，其根据所述无刷电机相线上的端电压和/或电流计算获得无刷电机转子的位置并输出至所述信号处理单元。所述信号处理单元产生所述驱动信号，驱动所述无刷电机的转子，所述驱动信号根据所述的无刷电机转子的位置产生。
可选的，上述圆锯中，所述无刷电机的定子还设有位置传感器，所述控制单元或控制器进一步与所述位置传感器电性连接，其根据所述位置传感器的信号得到无刷电机转子的位置，所述驱动信号根据所述的无刷电机转子的位置产生。
可选的，上述的圆锯中，信号处理单元对所述电机的相电流和/或母线电流进行处理包括：根据电机的相电流和/或母线电流，按照所得到的所述电机转子的位置生成所述驱动信号驱动所述电机，以控制所述电机输出正弦电流。可选 的，所述信号处理单元对所述电机的相电流和/或母线电流进行处理包括：响应所述开关装置的信号和/或所述电池包的工作数据，根据电机的相电流和/或母线电流，按照所述电机转子的位置生成所述驱动信号，驱动所述电机，以控制所述电机输出正弦电流。其中，正弦电流的幅值和/或流向可通过所述驱动信号调节。其中，所述电池包的工作数据包括电池包输出电流和/或电池包温度；所述开关装置的信号包括待机、停机、减速或能量回收。
可选的，上述的圆锯中还包括单向导电元件，所述开关装置连接在所述驱动电路与所述电池包之间，所述单向导电元件与所述开关装置并联，所述单向导电元件导通时电流由所述驱动电路流向所述电池包。
可选的，上述的圆锯中还包括二极管D1，用于将无刷电机上电流通过二极管D1回馈至电池包。
可选的，上述的圆锯中还包括二极管D1，所述二极管D1与开关装置并联，所述二极管D1在所述开关装置处于断开状态时导通，以将无刷电机输出的电流经二极管D1回馈至电池包。
同时，本公开还提供一种圆锯，包括：无刷电机，所述无刷电机包括定子和转子；所述电机的转子连接有电机轴；所述电机轴由所述无刷电机的转子驱动；锯片轴，用于支持锯片转动以对工件进行切割作业；传动装置，所述传动装置用于连接所述电机轴至所述锯片轴；驱动电路，所述驱动电路用于输出驱动信号以控制所述无刷电机的转子运转；控制单元，用于根据所述驱动电路产生的驱动信号驱动所述无刷电机；以及电源，为所述无刷电机、驱动电路、控制单元供电。其中，所述控制单元包括信号处理单元：所述信号处理单元设置成采集无刷电机母线和/或相电流，经信号处理单元处理后，输出驱动信号给所述驱动电路，驱动电路控制所述无刷电机输出正弦电流，使得所述无刷电机带动所述锯片在所述圆锯每次停机过程中回收至少0.01wh能量。
可选的，上述的圆锯中，所述传动装置包括相互啮合的蜗轮和蜗杆。
可选的，上述的圆锯还包括单向导电元件和开关装置：所述开关装置连接在所述驱动电路与所述电源之间，用于响应用户对所述圆锯的操作，产生开关信号；所述单向导电元件与所述开关装置并联，所述单向导电元件在所述开关装置处于断开状态时导通，所述单向导电元件导通时将所述电机输出的正弦电 流由所述驱动电路回馈至所述电源。
可选的，上述圆锯中，包括有二极管D1，用于将无刷电机上电流通过二极管D1回馈至电源。
可选的，上述圆锯中，包括二极管D1和开关装置；所述开关装置连接在所述驱动电路与所述电源之间，用于响应用户对所述圆锯的操作，产生开关信号；所述二极管D1与所述开关装置并联，在所述开关装置处于断开状态时导通，所述二极管D1导通时将所述无刷电机输出的正弦电流由所述驱动电路回馈至所述电源。
同时，本公开还对应地提出一种圆锯，包括：电机，所述电机包括定子和转子；以及传动装置，所述传动装置可操作地与所述转子联接，驱动所述圆锯的锯片以对工件进行切割作业；驱动电路，所述驱动电路用于输出驱动信号以控制所述电机的转子运转；开关装置，所述开关装置用于响应对所述圆锯的操作，产生开关信号；控制单元，用于响应所述开关装置的开关信号产生驱动信号驱动所述电机。其中，所述控制单元包括信号处理单元，所述信号处理单元设置成采集电机母线和/或相电流，经信号处理单元处理后输出驱动信号给所述驱动电路，驱动电路控制所述电机输出正弦电流，使得所述电机带动所述锯片在所述圆锯每次停机过程中回收至少0.01wh能量。
可选的，所述圆锯还包括反馈电路，所述反馈电路用于将电机上电流回馈至所述的圆锯的电源。
可选的，如上所述的圆锯，其中，还包括二极管D1，用于将电机上电流通过二极管D1回馈至所述的圆锯的电源。
可选的，上述的圆锯，其中还包括单向导电元件；所述单向导电元件导通时将电机输出的电流由所述单向导电元件回馈至所述的圆锯的电源。
可选的，如上所述的圆锯，其中，所述电机的相电流和/或母线电流包括所述电机的母线电流、所述电机的相电流、所述开关电路上开关元件的极间电流中的任意一种或组合。
可选的，如上所述的圆锯，其中，所述传动装置包括相互啮合的蜗轮和蜗杆。
可选的，所述电机为无刷直流电机或者永磁同步电机。
可选的，其中的所述传动装置还可包括有减速结构。减速结构可包括配有不同齿数比的齿轮结构，或配置不同皮带轮半径的皮带传动结构。
有益效果
本公开通过信号处理单元，根据其采样获得的电机的相电流和/或母线电流进行处理，生成驱动信号，按照所述驱动信号驱动所述电机，使所述电机输出正弦电流。通过信号处理单元的处理，本公开所生成的驱动信号能够对电机上正弦电流的流向以及幅值进行控制，将电机产生的电流分量回馈至电源，对电源进行充电，实现能量回收，并控制能量回收过程中向电源充电的电流不大于50A，避免对电源造成过大冲击，保护电源，在每次停机过程中回收至少0.01wh能量。通过对能量的回收，本公开所述圆锯，电源每瓦时的电能储备能够支持圆锯完成至少0.9刀的切割刀数。即，本公开电源利用效率相比现有圆锯至少提升了1/5。也就是说，在电源电能储备量相同的状况下，本公开所述圆锯的有效工作时间能够延长至现有圆锯的1.2倍或以上。
附图说明
图1为本公开提供的第一实施例的一种外部结构示意图；
图2为本公开提供的第二实施例的连接关系示意图；
图3为本公开提供的第三实施例的结构示意图；
图4为应用于本公开所提供的第一实施例的电路系统架构框图；
图5为应用于本公开所提供的第二实施例的电路系统架构框图；
图6为本公开提供的电机控制系统中信号处理单元内控制流程的示意图；
图7为应用于本公开所提供的第三实施例的电路系统架构框图；
图8为本公开所述圆锯能量回收过程中电机电流的测试图。
具体实施方式
以下结合附图和具体实施例对本公开作具体的介绍。
在本公开的第一个实施例中，结合图1，本公开首先提供一种圆锯，其具体 结构包括：
底板1；机壳2，所述机壳安装在所述底板上；锯片罩3，所述锯片罩与所述机壳连接；锯片轴4，用于在所述锯片罩内支持锯片转动从而实现对工件进行切割作业；电机，所述电机设置于所述机壳内，包括定子和转子；电机轴6，所述电机轴由所述电机的转子驱动；传动装置7，所述传动装置用于连接所述电机轴与所述锯片轴，将电机轴的旋转运动传导至所述锯片轴以驱动锯片运转；所述传动装置具体可包括减速机构，如，相互啮合的蜗轮和蜗杆，或减速箱。所述蜗轮蜗杆或减速箱可包括配有不同齿数比的齿轮结构，或配置不同同步轮半径的同步带传动结构。在本公开的一个较佳实施例中，所述电机为无刷电机。
上述圆锯的运转还需依赖安装于PCB电路板上的电子部件，PCB电路板容纳于机壳2内，参考图4所示，具体包括：驱动电路、控制单元和电源电路。其中，驱动电路包括有开关电路8，还可包括有驱动芯片等外围电路，以提高开关电路8的负载能力。控制单元具体可通过一个或多个控制器组合实现，其内具体包括有位置估算单元和信号处理单元10。
上述圆锯的电源具体选择为电池包11，由电池包通过具体的电源电路，本实施例具体对应为DC-DC，为所述电机、驱动电路、信号处理单元供电。
参考图4，所述圆锯的电子部件还包括有开关装置SW1和二极管D1。所述开关装置设置于所述机壳外表面，连接所述驱动电路与所述电池包，用于响应对所述圆锯的操作，产生电信号，具体为开关信号至控制器。所述二极管D1与所述开关装置SW1并联，所述单向导电元件在所述开关装置SW1处于断开状态时导通，将电机输出的正弦电流经二极管D1回馈至电源。
图1中，所述控制单元、驱动电路、电机5、电源电路和二极管D1均由机壳2封闭，未暴露于图1视角。其具体连接关系可参考后续说明。
参考图4，驱动电路具体与所述电机5的三相电极U、V、W电连接，驱动所述电机运转。所述驱动电路具体包括有开关电路8，所述开关电路用于根据所述信号处理单元的控制输出驱动信号至电机的三相电极，以控制所述电机的转子运转。所述驱动电路具有输入端、输出端和采样端。如图4所示，开关电路8包括开关元件VT1、VT2、VT3、VT4、VT5、VT6。开关元件VT1-VT6以场效应管为例，其栅极端作为所述驱动电路的输入端，分别与信号处理单元的驱 动信号电性连接，开关元件的每个漏极或源极分别与电机的定子电连接。在本公开的一个实施例中，所述驱动信号具体包括有Q1至Q6六路信号。开关元件VT1-VT6依次按照信号处理单元输出的驱动信号改变导通状态，从而改变电池包11加载在无刷电机绕组上的电压状态，产生交变的磁场，驱动所述电机转子运转。
具体而言，上述驱动电路为了使无刷电机转动，具有多个驱动状态，在一个驱动状态下电机的定子会产生一个磁场，信号处理单元被配置为依据电机的转子转动位置输出相应的控制信号至驱动电路以使驱动电路切换驱动状态，从而使定子产生的磁场转动以驱动转子转动，实现对无刷电机的驱动。电机的转子转动位置，在本公开的一个实施例中可通过R1至R3所采集的电机的相电流经位置估算单元计算获得。
所述电子部件中的信号处理单元10，用于根据所述机壳外表面的开关装置SW1的电信号驱动所述驱动电路。其中，所述信号处理单元包括输入端、以及驱动信号输出端。上述输入端或驱动信号输出端既可通过专用接口硬件实现，也可以仅仅对应芯片的相应引脚。所述驱动信号输出端连接所述驱动电路的输入端，所述信号处理单元的输入端接收所述开关装置的信号以及位置评估单元输出的电机的转子转动位置以及对电机的相电流的采样；所述信号处理单元用于根据所述开关装置的开关信号对所述电机的工作电流进行处理，产生驱动信号。本实施例中具体为对所述电机的相电流进行处理，产生驱动信号。该工作电流也可以是母线电流或其与电机的相电流的组合。所述驱动信号由所述驱动信号输出端输出驱动所述驱动电路控制所述电机输出正弦电流以驱动所述锯片。其中，所述驱动信号还可由所述信号处理单元根据所述开关装置的开关信号和/或圆锯中电池包的工作数据，以及所述相电流和/或母线电流生成。所述开关电路根据所述驱动信号驱动所述电机运转输出正弦电流，由此，所述正弦电流的幅值和/或流向根据所述驱动信号调整。
本公开的一个实施例中，所述信号处理单元设置成采集电机母线和/或相电流，经信号处理单元处理后输出驱动信号给所述驱动电路，可以使得所述无刷电机以不大于50A的充电电流向所述电池包充电。较佳地，在本公开的另一个实施例中，所述信号处理单元设置成采集无刷电机母线和/或相电流，经信号处理单元进一步处理后输出驱动信号给所述驱动电路，使得所述无刷电机输出正 弦电流时，所述无刷电机以不大于50A的充电电流向所述电池包充电。
也就是说，经信号处理单元处理后输出的驱动信号控制所述驱动电路，使所述电机上产生的电流通过反馈电路回馈至电源，对电源进行充电，实现能量回收；较佳地，经信号处理单元处理后输出的驱动信号控制所述驱动电路，使所述电机输出正弦电流，并通过反馈电路回馈至电源，对电源进行充电，实现能量回收。
具体地，经信号处理单元处理后输出的驱动信号给驱动电路，所述驱动电路使所述电机输出的电流或正弦电流，使电机产生的负转矩通过反馈电路回馈至电源，对电源进行充电，实现能量回收。在本公开的一个实施例中，如图4、图5和图7所示，所述驱动电路使所述电机输出的电流或正弦电流，使电机产生负转矩的电流分量通过二极管D1回馈至电源，对电源进行充电，实现能量回收。通过对能量的回收，提高所述圆锯内电源每瓦时电能储备所能够完成的切割刀数，实现对电源利用效率的提升。
下面将图4所示信号处理单元结合图6所示的步骤流程，对所述信号处理单元对所述电机的相电流和/或母线电流进行处理的详细步骤进行阐述。
参考图6，步骤S1，信号处理单元通过输入端获得所述电机的相电流；
步骤S2，通过位置估算单元对所述电流进行计算获得所述电机的位置，并计算所示电机的转速；对所述电机的相电流通过坐标变换单元进行坐标变换，具体包括Clark变换和Park变换，获得励磁电流反馈值id，以及转矩电流反馈值iq；
步骤S4，电流环单元，图6中具体采用第一调节器和第二调节器，分别根据所述励磁电流反馈值id以及预先设置的励磁电流给定值id*调节电机的励磁分量；根据所述转矩电流反馈值iq以及预先设置的转矩电流给定值iq*调节电机的转矩分量；其中，预先设置的励磁电流给定值id*和/或转矩电流给定值iq*通过步骤S3，由控制器接收的对所述圆锯的操作所产生的电信号、电池包的工作数据以及电机的运转状态共同生成调速信号而确定；其中，对所述圆锯的操作所产生的电信号具体可包括待机、停机或减速，可通过开关装置SW1的通断状态，即开关装置SW1的开关信号获知；电池包的工作数据包括电池包输出电流和/或电池包温度；电机的运转状态包括电机位置和转速；
电流环单元对两分量进行调节后，输出至占空比计算单元，由占空比计算单元经步骤S5将电机的励磁分量与转矩分量转换为控制电机所连开关电路8的驱动信号，通过驱动信号输出端输出；其中，转换的具体计算过程可采用：先进行反Park变换，再经过SVPWM计算或SPWM计算的方式实现。
本实施例具体针对相电流，但母线电流、或者相电流与母线电流的组合，通过图6所示方法步骤同样可通过替换图6中的电机的工作电流，可类似处理，实现相似的驱动信号。
根据该驱动信号，控制图4上侧由TV1至TV6所示意的开关电路中开关元件的通断，实现对电机内各相线圈的供电。由此，电机输出正弦电流，该正弦电流按照对所述圆锯的操作以及电池包的工作数据对电流方向、幅值大小的要求，驱动所述圆锯中的电机运转。
所述驱动信号具体可设计为占空比数据，由所述占空比数据控制所述驱动电路，尤其是其中的开关电路根据所述驱动信号控制所述电机内绕组的通电时间，通过驱动信号导通相应相位的绕组，使之产生规律变化的磁场以驱动所述电机转子运转。所述驱动信号具体可为电机的占空比数据，所述占空比数据中，导通时间占比越大，电机内磁场强度越大，电机转子运转越快。电机运转时，由于其绕组的感性作用，电机输出正弦电流。受占空比数据调控，所述正弦电流的幅值和/或流向受所述开关装置SW1的开关信号和/或电动工具中电池包的工作数据限制。具体：在待机状态下，所述信号处理单元生成所述驱动信号驱动所述电机运转输出正弦电流幅值为待机档位，待机档位下，驱动所述电机运转的转速相对于工作状态下维持低速；停机或减速状态下，所述信号处理单元生成所述驱动信号驱动所述电机运转输出正弦电流流向所述电池包；在电池包的工作数据异常时，或者，还可包括所述信号处理单元接收对所述电动工具的控制信号为停机或减速时，所述信号处理单元生成所述驱动信号驱动所述电机运转输出正弦电流的幅值递减，直至所述电池包的工作数据异常消除。所述电池包的工作数据异常包括电池包输出电流过大和/或电池包温度过高。
具体到信号处理单元中，上述的控制可通过设置励磁电流给定值id*和转矩电流给定值iq*根据电机的控制接口接收的电信号和/或电动工具中电池包的工作数据以对应上述的调速需求，包括限制电机电流、停机、减速、能量回收、 无负载低速待机等，具体设置步骤按照如下操作进行，以实现对电机运转输出正弦电流幅值和流向的控制：
例如，上述的信号处理单元获知所述电动工具进入待机状态时，所述信号处理单元生成所述驱动信号驱动所述电机运转输出正弦电流幅值为待机档位。进入所述待机状态的方式有几种，例如，可通过触发开关装置SW1人工设置进入待机状态，或者默认刚触发工作状态后的一小段时间内处于待机状态，而后才进入工作状态。具体，在待机档位中，限制励磁电流给定值id*的绝对值大小，或一并限制转矩电流给定值iq*的绝对值大小，经占空比计算单元转换后，生成驱动信号控制所述待机档位的正弦电流幅值驱动所述电机运转的转速可由此控制小于工作状态下正弦电流幅值驱动所述电机运转的转速。
所述信号处理单元接收所述电动工具中电池包的工作数据异常，包括温度过高、电流过大时，或者，还可包括所述信号处理单元接收对所述电动工具进入停机或减速状态时所述信号处理单元生成所述驱动信号驱动所述电机运转输出正弦电流幅值递减，直至所述电池包的工作数据异常消除。其中，驱动所述正弦电流幅值递减具体可通过对转矩电流反馈值iq和/或转矩电流给定值iq*进行递减；或者通过设置励磁电流给定值id*向量为负向来实现。这样的设置，能够在算法内抵消电机磁场，从而降低电机电源，如电池包输出的电流，从而有效调整电动工具的功耗。这种直接对电路中电流的调控，这在传统技术的电动工具领域中，难以实现。
所述信号处理单元接收所述电动工具进入停机或减速状态时，所述信号处理单元生成所述驱动信号驱动所述电机运转输出正弦电流流向所述电池包。这样的效果可具体通过控制通过设置转矩电流给定值iq*向量为负向，此时还可一并设置励磁电流给定值id*为0。由此在算法内抵消电机转矩，从而降低电机驱动能力，而实现对电机的运转速度的有效降低。同时，通过停机或减速指令触发的开关，图4中SW1，还可以在设置转矩电流给定值iq*向量为负向的同时被置于关断状态。由此，电机电流将通过单向导电元件，例如，如图4中二极管D1，将负向的电流反馈回电池包，对电池包进行充电。
充电过程中，信号处理单元输出驱动信号控制所述驱动电路，通过驱动电路控制所述电机输出的正弦电流，进而控制电机由该正弦电流所产生的负转矩 的大小。由此，将电机所产生的负转矩电流分量通过二极管D1回馈至电源时，可限制其对电源进行充电的电流大小在电池有效充电的电流范围内，保护电池并实现能量回收。
具体，所述信号处理单元可通过控制转矩电流反馈值iq和/或转矩电流给定值iq*，生成相应驱动信号，由所述驱动信号控制所述开关电路驱动所述电机运转，进而控制所述电机运转输出的正弦电流的幅值和流向，使其转换后的充电电流在电池包可接受的范围内流向电池包，实现有效充电并保护电池包。所述充电电流：
在充电电流的冲击时间不超过200ms时，最大冲击电流(充电电流)可控制在6c或以下；
在充电电流的冲击时间不超过1s时，最大冲击电流(充电电流)可控制在5c或以下；
在充电电流的冲击时间达到1s或以上时，最大冲击电流(充电电流)可控制在4c或以下；
其中，最大冲击电流大小与电池包并联支数p的关系为：支数(p)*每支电池包的容量(Ah)＝最大冲击电流的安培数(A)。例如，1p的电池包，容量为2.5Ah，最大冲击电流6c所对应的电流大小为15A；2p的电池包，容量为2.5Ah，最大冲击电流6c所对应的电流大小为30A。
参考图8所示，由蜗轮蜗杆结构作为传动装置的圆锯在能量回收过程中测试得到标号1所示的电机电流数据。其中，a、b两点标记之间为充电电流的冲击过程，所述充电电流的冲击时间在496ms以内，最大冲击电流为4.8A。以48V直流电源为例，本次充电电流回收的能量对应为0.02wh。
以上，根据电机的不同工作状态，例如待机、减速、停机、能量回收，通过信号处理单元对电机的相电流和/或母线电流的处理，实际可应用于任意电动工具，实现对其内电机运转输出的正弦电流的控制。具体包括控制所述正弦电流的流向和幅值。具体，应用于圆锯或圆锯，由于信号处理单元对电机的励磁分量与转矩分量的调节，可根据电动工具的状态动态调节其能耗水平，并在需要时对电机能量进行回收。由此，本公开所述电动工具对电能的利用率得到显著提高，具体，可通过功率控制或能量回收，使得圆锯或圆锯每次回收至少 0.01wh能量，在切割过程中利用每瓦时电池包容量实现0.9刀以上的切割刀数。同时，由于控制能量回收过程中向电源充电的电流不大于50A，可避免对电源造成过大冲击，保护电源。
对照图4下侧，上述的方案中，具体仅以采集电机的相电流为例。对电机的相电流的采集可通过图4下侧所示开关电路中，在开关元件VT1～VT6所组成的3组桥臂上串接的电阻R1～R3实现。桥臂上串接的电阻R1～R3将电机相电流转化为采样的电压信号，将采样的电压信号通过放大器放大，输入至控制器，实现对电机相电流的采集。
应当注意控制器所采集的电流信号，除本实施例中的相电流外，还可以包括所述电机的母线电流、所述电机所连接的开关电路上开关元件的极间电流中的任意一种、任意若干种、任一种的组合或任意若干种的组合。当然，本领域技术人员也可直接通过一个串接于开关电路8下臂所连接的母线上的采样电阻进行类似处理，或者，直接通过算法分析VT2等开关元件上的极间电流，配合依据元件特性的修正函数，或者将上述方法综合应用，都可同样分析获得电机的运转状况。对电机母线电流的采样将在下一实施例中进行分析。
在本公开的第二个实施例中，结合图2，本公开还提供一种圆锯，其具体结构包括：
电机5，所述电机5包括定子和转子；电机轴6，由所述电机的转子驱动；锯片轴4，用于支持锯片转动从而对工件进行切割作业；传动装置，所述传动装置用于连接所述电机轴至所述锯片轴。
上述圆锯的运转还需依赖安装于PCB电路板上的电子部件，PCB电路板安装于电机5的后方，参考图5所示，本实施例中的PCB电路板20可具体包括：开关电路8、控制器、位置传感器和电源电路。其中，控制器包括有信号处理单元10。位置传感器安装于电机5定子上，用于感应转子位置向所述控制器输出电机转子的位置信号。
上述圆锯的电源可选择为电池包11或其他供电装置，由电源通过具体的电源电路，本实施例具体对应为DC-DC，为所述电机、开关电路、信号处理单元供电。控制器或信号处理单元可具体根据圆锯控制所需精度和响应时间选择适 当控制芯片来实现。控制芯片包括单片机(MCU，Microcontroller Unit)、ARM(Advanced RISC Machines)芯片、DSP(Digital Signal Processor，数字信号处理器)等。
参考图5，所述圆锯的PCB电路板上还连接有开关装置SW1和单向导电元件D1。所述开关装置连接所述驱动电路与所述电源，用于响应对所述圆锯的操作，产生相应信号至控制器。所述单向导电元件D1具体可选择为二极管、可控硅等。以二极管为例，所述二极管与所述开关装置SW1并联，所述单向导电元件在所述开关装置SW1处于断开状态时导通，用于将电机输出的正弦电流经二极管D1回馈至电源。可控硅的实现方式与二极管类似，保证可控硅中用于单向导通的管脚之间的电流回馈至电源即可。
参考图5，开关电路驱动所述电机5的具体方式与实施例一类似，在此不加赘述。本实施例区别于实施例一，电机的转子转动位置，在本实施例中可通过位置传感器直接获得并传输至控制器。由此，本实施例中所述控制器内可无需设置位置估算单元。所述控制器依据位置传感器获得的所述电机的转子位置以及通过采样电阻R4获得的母线电流生成驱动信号，将驱动信号发送至驱动电路以使驱动电路切换驱动状态，从而使定子产生的磁场转动以驱动转子转动，实现对无刷电机的驱动。由此，电机输出正弦电流以驱动所述锯片。其中，所述驱动信号同样可通过类似实施例一的方式，由所述信号处理单元根据所述开关装置的开关信号和/或电动工具中电池包的工作数据，以及采样获得的所述母线电流生成。所述信号处理单元对所述电机的母线电流进行处理生成驱动信号的详细步骤，以及对该驱动信号对所述正弦电流的幅值和/或流向的控制与上一实施例中类似。对所述电机的母线电流处理生成驱动信号时，将采样获得的所述母线电流作为所述电机的工作电流，其处理步骤流程可参考图6。这里，与实施例一的区别仅在于，辨识所述电机的位置及转速的步骤，在本实施例中可直接通过控制器获取本实施例中位置传感器的数据而实现。
以上，根据电机的不同工作状态，如待机、减速、停机、能量回收，可通过信号处理单元对电机的相电流和/或母线电流的处理，实现对电动工具内电机运转输出的正弦电流的控制，包括控制所述正弦电流的流向和幅值。具体，应用于圆锯，由于信号处理单元对电机的励磁分量与转矩分量的调节，可根据圆锯的状态动态调节其能耗水平，并在减速、停机过程中通过单向开关元件向电 源处引入电流，对电机能量进行回收。尤其，由于信号处理单元输出驱动信号控制所述驱动电路，通过驱动电路控制所述电机输出的正弦电流，进而控制该正弦电流所产生的负转矩的电流大小，实现对电机电流幅值和方向的控制。本公开可将引入电源处的电流控制在50A的有效充电的电流范围内，可以选择0～20A，20～35A，35～50A，以此保证充电效率并保护电源。
由此，本公开所述圆锯对电能的利用率得到显著提高，具体，通过功率控制或能量回收，使得本公开所述圆锯每瓦时电池包容量实现0.9刀以上的切割刀数。并保证每次回收过程中向电源充电的电流的大小不超过50A，避免对电源造成过大冲击，保护电源。相对于目前圆锯0.8刀/瓦时的切割刀数，本实施例将圆锯的作业能力提升了20％。也就是说，相同规格的电源，本实施例中的圆锯能够额外完成20％的切割作业。这种对效率的提升还是相当可观的。这里获得的切割刀数，如每瓦时至少0.9刀～1.0刀，每瓦时1.0刀～1.2刀，每瓦时1.2刀～1.4刀，每瓦时1.4刀～1.6刀是通过切割松木获得，切割松木时，切割面的尺寸为40mm*200mm。
在本公开的第三个实施例中，结合图3，本公开还提供一种手持式电动工具，其具体结构包括：
电机5，所述电机包括定子和转子；传动装置7，所述传动装置7可操作地与所述转子联接，用于将所述电机转子的旋转运动传递至所述手持式电动工具的工具附件，以驱动所述工具附件运转进行作业。
这里的工具附件包括但不限于电钻的钻头，角磨的磨片，往复锯的抬刀机构、锯条，圆锯的锯片，抛光机的海绵或抛光盘，螺丝批的螺丝头，扳手的螺旋槽、冲击机构，搅拌机的搅拌棒，等。由此，本实施例中所述的电动工具可对应为圆锯、电钻、角磨、往复锯、抛光机、螺丝批、扳手、搅拌机，等
上述手持式电动工具的运转还需依赖安装于PCB电路板上的电子部件，PCB电路板可设置于电机5后侧，参考图7所示，具体包括：驱动电路、控制器和电源电路。其中，控制器包括有位置估算单元和信号处理单元10。
上述手持式电动工具的电源通过具体的电源电路，为所述电机、驱动电路、信号处理单元供电。本实施例，电源具体对应为DC-DC，可包括电源芯片及其 外围电路，
参考图7，所述手持式电动工具的电子部件还包括有开关装置SW1和二极管D1。所述开关装置连接所述驱动电路与所述电源，用于响应用户对所述手持式电动工具的操作，产生电信号至控制器。所述二极管D1与所述开关装置SW1并联，所述二极管D1的正极连接驱动电路，负极连接电源，在所述开关装置SW1处于断开状态时导通，将电机输出的正弦电流回馈至电源。
参考图7，驱动电路驱动所述电机5运转的方式与上述实施例类似，在此不加赘述。与上述实施例相区别的是，本实施例中，信号处理单元产生驱动信号所依据的电机转子的转动位置，具体通过驱动电路母线上的电阻R4所采集的电机的母线电流经位置估算单元计算获得。
位置估算单元对电机的位置及转速的计算可通过如下步骤实现：
步骤B1，锁定所述电机的工作电流的过零点周期，计算所述电机的工作电流的频率f；工作电流，这里具体指驱动电路母线上的电阻R4所采集的电机的母线电流；当然，所述电机的工作电流还可包括上述各实施例中采集的电机的相电流和/或母线电流及其组合，处理过程类似；
步骤B2，计算所述电机的转速n＝60f/P；其中，P为所述电机的极对数；
步骤B3；积分获得所述
Figure PCTCN2018094907-appb-000001
其中s为所述电机的采样点数；ω为所述电机的工作电流的频率f对应的角频率。
区别于传统先计算电机位置再通过对位置进行微分获得电机转速的方法，通过上述方式计算电机位置和转速可避免微分所带来的庞大运算量，节约系统开销，提高运算效率。
所述控制器依据所述位置估算单元计算得到的电机的转子位置以及通过采样电阻R4获得的母线电流生成驱动信号，将驱动信号发送至驱动电路以使驱动电路切换驱动状态，从而使定子产生的磁场转动以驱动转子转动，实现对无刷电机的驱动。由此，电机输出正弦电流以驱动所述锯片。其中，所述驱动信号同样可通过类似实施例一的方式，由所述信号处理单元根据所述开关装置SW1的信号和/或电动工具中电池包的工作数据，以及采样获得的所述母线电流生成。所述信号处理单元对所述电机的母线电流进行处理生成驱动信号的详细步骤， 以及对该驱动信号对所述正弦电流的幅值和/或流向的控制与上述实施例中类似。对所述电机的母线电流处理生成驱动信号时，将采样获得的所述母线电流作为所述电机的工作电流，其处理步骤流程同样可参考图6。
由此，根据电机的不同工作状态，包括待机、减速、停机、能量回收，可通过信号处理单元对电机的相电流和/或母线电流的处理，输出驱动信号控制所述驱动电路，通过驱动电路控制所述电机输出的正弦电流，进而控制电机因该正弦电流所产生的负转矩的大小。由此，实现对电动工具内电机运转输出的正弦电流的控制，在将电机所产生的负转矩电流分量通过二极管D1回馈至电源时，限制对电源进行充电的电流的流向和幅值，实现能量回收，并在能量回收的过程中保护电源。具体，通过信号处理单元对电机的励磁分量与转矩分量的调节，可根据电动工具的状态动态调节其能耗水平，并在减速、停机过程中通过类似二极管D1的单向导电元件向电源处引入电流。在以相互啮合的蜗轮、蜗杆作为所述传动装置7的情况下，每次向电源处引入电流所回收的能量＞0.01wh。由此，本公开所述电动工具对电能的利用率得到显著提高，具体，通过功率控制或能量回收，使得本公开所述电动工具在配备相同规格的电源的情况下，额外提升20％的作业能力，即相同负载状况下，工具续航时间延长至原先的1.2倍。
以上显示和描述了本公开的基本原理、主要特征和优点。本行业的技术人员应该了解，上述实施例不以任何形式限制本公开，凡采用等同替换或等效变换的方式所获得的技术方案，均落在本公开的保护范围内。
工业实用性
本公开提供一种圆锯，通过优化对电机的相电流和/或母线电流的处理，能够独立调节圆锯内电机的电流，将电机产生的电能回馈至电源，以优化对电源的利用效率，可以使得圆锯等电动工具，能耗特性更优。

Claims (66)

  1. 一种圆锯，包括：
    底板；
    机壳，所述机壳安装在所述底板上；
    锯片罩，所述锯片罩与所述机壳连接；
    锯片轴，用于在所述锯片罩内支持锯片；
    无刷电机，所述无刷电机设置于所述机壳内，包括定子和转子；
    电机轴，所述电机轴由所述无刷电机的转子驱动；
    传动装置，所述传动装置用于连接所述电机轴与所述锯片轴，其中所述传动装置包括相互啮合的蜗轮和蜗杆；
    驱动电路，所述驱动电路包括开关电路，所述开关电路用于输出驱动信号以控制所述无刷电机的转子运转；
    开关装置，所述开关装置设置于所述机壳外表面，用于响应用户对所述圆锯的操作，产生开关信号；
    控制单元，用于根据所述驱动电路产生的驱动信号驱动所述无刷电机；
    电池包，为所述无刷电机、驱动电路、控制单元供电；
    其特征在于，所述控制单元包括信号处理单元，所述信号处理单元设置成采集无刷电机母线和/或相电流，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机以不大于50A的充电电流向所述电池包充电。
  2. 如权利要求1所述的圆锯，其特征在于，所述控制单元进一步包括位置估算单元，其根据所述无刷电机相线上的端电压和/或电流计算获得无刷电机转子的位置，所述驱动信号根据所述的无刷电机转子的位置产生。
  3. 如权利要求1所述的圆锯，其特征在于，所述无刷电机附近还设有位置 传感器，所述控制单元进一步与所述位置传感器电性连接，根据所述位置传感器的信号得到无刷电机转子的位置，所述驱动信号根据所述的无刷电机转子的位置产生。
  4. 如权利要求1所述的圆锯，其特征在于，所述圆锯还包括单向导电元件，所述开关装置连接在所述驱动电路与所述电池包之间，所述单向导电元件与所述开关装置并联，所述单向导电元件导通时电流由所述驱动电路流向所述电池包。
  5. 如权利要求1所述的圆锯，其特征在于，所述圆锯还包括二极管D1，用于将无刷电机上电流通过二极管D1回馈至电池包。
  6. 如权利要求1所述的圆锯，其特征在于，所述圆锯还包括二极管D1，所述二极管D1与开关装置并联，所述二极管D1在所述开关装置处于断开状态时导通，以将无刷电机输出的电流经二极管D1回馈至电池包。
  7. 如权利要求1所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机以35A～50A的充电电流向所述电池包充电。
  8. 如权利要求1所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机以20A～35A的充电电流向所述电池包充电。
  9. 如权利要求1所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机以0A～20A的充电电流向所述电池包充电。
  10. 一种圆锯，包括：
    无刷电机，所述无刷电机包括定子和转子；
    电机轴，所述电机轴由所述无刷电机的转子驱动；
    锯片轴，所述锯片轴用于支持锯片以对工件进行切割作业；
    传动装置，所述传动装置用于连接所述电机轴至所述锯片轴；
    驱动电路，所述驱动电路用于输出驱动信号以控制所述无刷电机的转子运转；
    控制单元，用于根据所述驱动电路产生的驱动信号驱动所述无刷电机；
    电源，为所述无刷电机、驱动电路、控制单元供电；
    其特征在于，所述控制单元包括信号处理单元，所述信号处理单元设置成采集无刷电机母线和/或相电流，经信号处理单元处理后输出驱动信号给所述驱动电路，驱动电路控制所述无刷电机输出正弦电流，使得所述无刷电机以不大于50A的充电电流向所述电源充电。
  11. 如权利要求10所述的圆锯，其特征在于，所述传动装置包括相互啮合的蜗轮和蜗杆
  12. 如权利要求10所述的圆锯，其特征在于，还包括二极管D1，用于将无刷电机上电流通过二极管D1回馈至电源。
  13. 如权利要求10所述的圆锯，其特征在于，还包括二极管D1和开关装置；
    所述开关装置连接在所述驱动电路与所述电源之间，用于响应用户对所述圆锯的操作，产生开关信号；
    所述二极管D1与所述开关装置并联，在所述开关装置处于断开状态时导通，所述二极管D1导通时将所述无刷电机输出的正弦电流由所述驱动电路回馈 至所述电源。
  14. 如权利要求10所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机以35A～50A的充电电流向所述电源充电。
  15. 如权利要求10所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机以20A～35A的充电电流向所述电源充电。
  16. 如权利要求10所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机以0A～20A的充电电流向所述电源充电。
  17. 一种圆锯，包括：
    电机，所述电机包括定子和转子；以及
    传动装置，所述传动装置可操作地与所述转子联接，驱动所述圆锯的锯片以对工件进行切割作业；
    驱动电路，所述驱动电路用于输出驱动信号以控制所述电机的转子运转；
    控制单元，用于根据所述驱动电路产生的驱动信号驱动所述电机；
    其特征在于，所述控制单元包括信号处理单元，所述信号处理单元设置成采集电机母线和/或相电流，经信号处理单元处理后输出驱动信号给所述驱动电路，驱动电路控制所述电机输出正弦电流，使得所述电机以不大于50A的充电电流向所述圆锯的电源充电。
  18. 如权利要求17所述的圆锯，其特征在于，所述圆锯还包括反馈电路，所述反馈电路用于将电机上电流回馈至所述的圆锯的电源。
  19. 如权利要求17所述的圆锯，其特征在于，所述圆锯还包括二极管D1，用于将电机上电流通过二极管D1回馈至所述的圆锯的电源。
  20. 如权利要求17所述的圆锯，其特征在于，所述圆锯还包括单向导电元件；所述单向导电元件导通时将电机输出的电流由所述单向导电元件回馈至所述的圆锯的电源。
  21. 如权利要求17所述的圆锯，其特征在于，所述传动装置包括相互啮合的蜗轮和蜗杆。
  22. 如权利要求17所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述电机以35A～50A的充电电流向所述圆锯的电源充电。
  23. 如权利要求17所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述电机以20A～35A的充电电流向所述圆锯的电源充电。
  24. 如权利要求17所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述电机以0A～20A的充电电流向所述圆锯的电源充电。
  25. 一种圆锯，包括：
    底板；
    机壳，所述机壳安装在所述底板上；
    锯片罩，所述锯片罩与所述机壳连接；
    锯片轴，用于在所述锯片罩内支持锯片；
    无刷电机，所述无刷电机设置于所述机壳内，包括定子和转子；
    电机轴，所述电机轴由所述无刷电机的转子驱动；
    传动装置，所述传动装置用于连接所述电机轴与所述锯片轴，其中所述传动装置包括相互啮合的蜗轮和蜗杆；
    驱动电路，所述驱动电路包括开关电路，所述开关电路用于输出驱动信号以控制所述无刷电机的转子运转；
    开关装置，所述开关装置设置于所述机壳外表面，用于响应用户对所述圆锯的操作，产生开关信号；
    控制单元，用于根据所述驱动电路产生的驱动信号驱动所述无刷电机；
    电池包，为所述无刷电机、驱动电路、控制单元供电；
    其特征在于，所述控制单元包括信号处理单元，所述信号处理单元设置成采集无刷电机母线和/或相电流，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少0.9刀的切割刀数。
  26. 如权利要求25所述的圆锯，其特征在于，所述控制单元进一步包括位置估算单元，其根据所述无刷电机相线上的端电压和/或电流计算获得无刷电机转子的位置，所述驱动信号根据所述的无刷电机转子的位置产生。
  27. 如权利要求25所述的圆锯，其特征在于，所述无刷电机附近还设有位置传感器，所述控制单元进一步与所述位置传感器电性连接，根据所述位置传感器的信号得到无刷电机转子的位置，所述驱动信号根据所述的无刷电机转子的位置产生。
  28. 如权利要求25所述的圆锯，其特征在于，所述圆锯还包括单向导电元件，所述开关装置连接在所述驱动电路与所述电池包之间，所述单向导电元件与所述开关装置并联，所述单向导电元件导通时电流由所述驱动电路流向所述 电池包。
  29. 如权利要求25所述的圆锯，其特征在于，所述圆锯还包括二极管D1，用于将无刷电机上电流通过二极管D1回馈至电池包。
  30. 如权利要求25所述的圆锯，其特征在于，所述圆锯还包括二极管D1，所述二极管D1与开关装置并联，所述二极管D1在所述开关装置处于断开状态时导通，以将无刷电机输出的电流经二极管D1回馈至电池包。
  31. 如权利要求25所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少0.9刀～1.0刀的切割刀数。
  32. 如权利要求25所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少1.0刀～1.2刀的切割刀数。
  33. 如权利要求25所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少1.2刀～1.4刀的切割刀数。
  34. 如权利要求25所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少1.4刀～1.6刀的切割刀数。
  35. 一种圆锯，包括：
    无刷电机，所述无刷电机包括定子和转子；
    电机轴，所述电机轴由所述无刷电机的转子驱动；
    锯片轴，所述锯片轴用于支持锯片以对工件进行切割作业；
    传动装置，所述传动装置用于连接所述电机轴至所述锯片轴；
    驱动电路，所述驱动电路用于输出驱动信号以控制所述无刷电机的转子运转；
    控制单元，用于根据所述驱动电路产生的驱动信号驱动所述无刷电机；
    电源，为所述无刷电机、驱动电路、控制单元供电；
    其特征在于，所述控制单元包括信号处理单元，所述信号处理单元设置成采集无刷电机母线和/或相电流，经信号处理单元处理后输出驱动信号给所述驱动电路，驱动电路控制所述无刷电机输出正弦电流，使得所述无刷电机带动所述锯片达每瓦时至少0.9刀的切割刀数。
  36. 如权利要求35所述的圆锯，其特征在于，所述传动装置包括相互啮合的蜗轮和蜗杆
  37. 如权利要求35所述的圆锯，其特征在于，还包括二极管D1，用于将无刷电机上电流通过二极管D1回馈至电源。
  38. 如权利要求35所述的圆锯，其特征在于，还包括二极管D1和开关装置；
    所述开关装置连接在所述驱动电路与所述电源之间，用于响应用户对所述圆锯的操作，产生开关信号；
    所述二极管D1与所述开关装置并联，在所述开关装置处于断开状态时导通，所述二极管D1导通时将所述无刷电机输出的正弦电流由所述驱动电路回馈至所述电源。
  39. 如权利要求35所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少0.9刀 ～1.0刀的切割刀数。
  40. 如权利要求35所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少1.0刀～1.2刀的切割刀数。
  41. 如权利要求35所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少1.2刀～1.4刀的切割刀数。
  42. 如权利要求35所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片达每瓦时至少1.4刀～1.6刀的切割刀数。
  43. 一种圆锯，包括：
    电机，所述电机包括定子和转子；以及
    传动装置，所述传动装置可操作地与所述转子联接，驱动所述圆锯的锯片以对工件进行切割作业；
    驱动电路，所述驱动电路用于输出驱动信号以控制所述电机的转子运转；
    控制单元，用于根据所述驱动电路产生的驱动信号驱动所述电机；
    其特征在于，所述控制单元包括信号处理单元，所述信号处理单元设置成采集电机母线和/或相电流，经信号处理单元处理后输出驱动信号给所述驱动电路，驱动电路控制所述电机输出正弦电流，使得所述电机带动所述锯片达每瓦时至少0.9刀的切割刀数。
  44. 如权利要求43所述的圆锯，其特征在于，所述圆锯还包括反馈电路，所述反馈电路用于将电机上电流回馈至所述的圆锯的电源。
  45. 如权利要求43所述的圆锯，其特征在于，所述圆锯还包括二极管D1，用于将电机上电流通过二极管D1回馈至所述的圆锯的电源。
  46. 如权利要求43所述的圆锯，其特征在于，所述圆锯还包括单向导电元件；所述单向导电元件导通时将电机输出的电流由所述单向导电元件回馈至所述的圆锯的电源。
  47. 如权利要求43所述的圆锯，其特征在于，所述传动装置包括相互啮合的蜗轮和蜗杆。
  48. 如权利要求43所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述电机带动所述锯片达每瓦时至少0.9刀～1.0刀的切割刀数。
  49. 如权利要求43所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述电机带动所述锯片达每瓦时至少1.0刀～1.2刀的切割刀数。
  50. 如权利要求43所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述电机带动所述锯片达每瓦时至少1.2刀～1.4刀的切割刀数。
  51. 如权利要求43所述的圆锯，其特征在于，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述电机带动所述锯片达每瓦时至少1.4刀～1.6刀的切割刀数。
  52. 一种圆锯，包括：
    底板；
    机壳，所述机壳安装在所述底板上；
    锯片罩，所述锯片罩与所述机壳连接；
    锯片轴，用于在所述锯片罩内支持锯片；
    无刷电机，所述无刷电机设置于所述机壳内，包括定子和转子；
    电机轴，所述电机轴由所述无刷电机的转子驱动；
    传动装置，所述传动装置用于连接所述电机轴与所述锯片轴，其中所述传动装置包括相互啮合的蜗轮和蜗杆；
    驱动电路，所述驱动电路包括开关电路，所述开关电路用于输出驱动信号以控制所述无刷电机的转子运转；
    开关装置，所述开关装置设置于所述机壳外表面，用于响应用户对所述圆锯的操作，产生开关信号；
    控制单元，用于根据所述驱动电路产生的驱动信号驱动所述无刷电机；
    电池包，为所述无刷电机、驱动电路、控制单元供电；
    其特征在于，所述控制单元包括信号处理单元，所述信号处理单元设置成采集无刷电机母线和/或相电流，经信号处理单元处理后输出驱动信号给所述驱动电路，使得所述无刷电机带动所述锯片在所述圆锯每次停机过程中回收至少0.01wh能量。
  53. 如权利要求52所述的圆锯，其特征在于，所述控制单元进一步包括位置估算单元，其根据所述无刷电机相线上的端电压和/或电流计算获得无刷电机转子的位置，所述驱动信号根据所述的无刷电机转子的位置产生。
  54. 如权利要求52所述的圆锯，其特征在于，所述无刷电机附近还设有位置传感器，所述控制单元进一步与所述位置传感器电性连接，根据所述位置传感器的信号得到无刷电机转子的位置，所述驱动信号根据所述的无刷电机转子 的位置产生。
  55. 如权利要求52所述的圆锯，其特征在于，所述圆锯还包括单向导电元件，所述开关装置连接在所述驱动电路与所述电池包之间，所述单向导电元件与所述开关装置并联，所述单向导电元件导通时电流由所述驱动电路流向所述电池包。
  56. 如权利要求52所述的圆锯，其特征在于，所述圆锯还包括二极管D1，用于将无刷电机上电流通过二极管D1回馈至电池包。
  57. 如权利要求52所述的圆锯，其特征在于，所述圆锯还包括二极管D1，所述二极管D1与开关装置并联，所述二极管D1在所述开关装置处于断开状态时导通，以将无刷电机输出的电流经二极管D1回馈至电池包。
  58. 一种圆锯，包括：
    无刷电机，所述无刷电机包括定子和转子；
    电机轴，所述电机轴由所述无刷电机的转子驱动；
    锯片轴，所述锯片轴用于支持锯片以对工件进行切割作业；
    传动装置，所述传动装置用于连接所述电机轴至所述锯片轴；
    驱动电路，所述驱动电路用于输出驱动信号以控制所述无刷电机的转子运转；
    控制单元，用于根据所述驱动电路产生的驱动信号驱动所述无刷电机；
    电源，为所述无刷电机、驱动电路、控制单元供电；
    其特征在于，所述控制单元包括信号处理单元，所述信号处理单元设置成采集无刷电机母线和/或相电流，经信号处理单元处理后输出驱动信号给所述驱动电路，驱动电路控制所述无刷电机输出正弦电流，使得所述无刷电机带动所 述锯片在所述圆锯每次停机过程中回收至少0.01wh能量。
  59. 如权利要求58所述的圆锯，其特征在于，所述传动装置包括相互啮合的蜗轮和蜗杆
  60. 如权利要求58所述的圆锯，其特征在于，还包括二极管D1，用于将无刷电机上电流通过二极管D1回馈至电源。
  61. 如权利要求58所述的圆锯，其特征在于，还包括二极管D1和开关装置；
    所述开关装置连接在所述驱动电路与所述电源之间，用于响应用户对所述圆锯的操作，产生开关信号；
    所述二极管D1与所述开关装置并联，在所述开关装置处于断开状态时导通，所述二极管D1导通时将所述无刷电机输出的正弦电流由所述驱动电路回馈至所述电源。
  62. 一种圆锯，包括：
    电机，所述电机包括定子和转子；以及
    传动装置，所述传动装置可操作地与所述转子联接，驱动所述圆锯的锯片以对工件进行切割作业；
    驱动电路，所述驱动电路用于输出驱动信号以控制所述电机的转子运转；
    控制单元，用于根据所述驱动电路产生的驱动信号驱动所述电机；
    其特征在于，所述控制单元包括信号处理单元，所述信号处理单元设置成采集电机母线和/或相电流，经信号处理单元处理后输出驱动信号给所述驱动电路，驱动电路控制所述电机输出正弦电流，使得所述电机带动所述锯片在所述圆锯每次停机过程中回收至少0.01wh能量。
  63. 如权利要求62所述的圆锯，其特征在于，所述圆锯还包括反馈电路，所述反馈电路用于将电机上电流回馈至所述的圆锯的电源。
  64. 如权利要求62所述的圆锯，其特征在于，所述圆锯还包括二极管D1，用于将电机上电流通过二极管D1回馈至所述的圆锯的电源。
  65. 如权利要求62所述的圆锯，其特征在于，所述圆锯还包括单向导电元件；所述单向导电元件导通时将电机输出的电流由所述单向导电元件回馈至所述的圆锯的电源。
  66. 如权利要求62所述的圆锯，其特征在于，所述传动装置包括相互啮合的蜗轮和蜗杆。
PCT/CN2018/094907 2017-08-18 2018-07-06 圆锯 WO2019033875A1 (zh)

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EP3666482B1 (en) 2022-08-31
CN209217984U (zh) 2019-08-06
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