CA1255378A - Pulse width modulation dc motor speed control - Google Patents
Pulse width modulation dc motor speed controlInfo
- Publication number
- CA1255378A CA1255378A CA000499009A CA499009A CA1255378A CA 1255378 A CA1255378 A CA 1255378A CA 000499009 A CA000499009 A CA 000499009A CA 499009 A CA499009 A CA 499009A CA 1255378 A CA1255378 A CA 1255378A
- Authority
- CA
- Canada
- Prior art keywords
- motor
- input
- pulse train
- integrated circuit
- voltage applied
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
- 238000010586 diagram Methods 0.000 description 3
- 101100204264 Arabidopsis thaliana STR4 gene Proteins 0.000 description 1
- 241001481828 Glyptocephalus cynoglossus Species 0.000 description 1
- 101001121392 Homo sapiens Otoraplin Proteins 0.000 description 1
- 102100026304 Otoraplin Human genes 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 101150076149 TROL gene Proteins 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229920006111 poly(hexamethylene terephthalamide) Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
- F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
- F02B61/045—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for marine engines
Landscapes
- Control Of Direct Current Motors (AREA)
Abstract
ABSTRACT
An electric outboard motor includes a dc motor, battery terminal and a propeller. A MOSFET
is connected to and controls operation of the motor.
is An integrated circuit has an output connected to the gate of said MOSFET and is operative to produce a pulse train of variable width which is applied to the gate. A manually operable potentiometer is connected between a battery terminal and the input to the integrated circuit to vary the voltage applied to the input to cause the integrated circuit to modulate the pulse width of the pulse train whereby the duty cycle of the MOSFET is varied in accordance with the setting of the potentiometer and the speed and thrust of the motor are varied accordingly. The integrated circuit includes a first integrated circuit operated as an oscillator to produce a pulse train and also includes a second integrated circuit operated as a variable delay monostable oscillator receiving the pulse train and producing a pulse train having a variable duty cycle which is applied to MOSFET gate.
An electric outboard motor includes a dc motor, battery terminal and a propeller. A MOSFET
is connected to and controls operation of the motor.
is An integrated circuit has an output connected to the gate of said MOSFET and is operative to produce a pulse train of variable width which is applied to the gate. A manually operable potentiometer is connected between a battery terminal and the input to the integrated circuit to vary the voltage applied to the input to cause the integrated circuit to modulate the pulse width of the pulse train whereby the duty cycle of the MOSFET is varied in accordance with the setting of the potentiometer and the speed and thrust of the motor are varied accordingly. The integrated circuit includes a first integrated circuit operated as an oscillator to produce a pulse train and also includes a second integrated circuit operated as a variable delay monostable oscillator receiving the pulse train and producing a pulse train having a variable duty cycle which is applied to MOSFET gate.
Description
~5~:3 7~3 PULSE ~IDTH MODULATION DC ~OTOR SPEED CO~TROL
BACKGROUND OF THE INVENTION
Elect.ric outboard motors have a dc motor driving the proeeller. The ~otor speed is controlled by placing ~ore or les~ re~istance in ~eries wi~h the ~o~or. The ene~gy di~ipated in the resistance is a los~. It is known that dc motor speed can be controlled by variatio~ o~ the "on" ti~e of the motor. This can be done by placing a ~witching device in the motor power ~upply to ~witch the power on and o~f. The motor ~till receives its rated voltage but for less time. This conce~t has been u~ed in controlling the motor Epeed in vehicles and the control circuits are quite elabolate and a~e : 15 not cost effective for outboard ~otor co~trols. And the control circuits require too much power for outboard motor use.
; At~ention is directed to the ~ollowing U.S. patents directed to motor controls:
20 Pa~entee Patent No. Issued Date : Ninebrener 3,686,549 Aug. 22, 1972 Henry 3,694,721 Sept. 26, 1972 ~: Mc~enna 3,617,845 Nov. 2. 1971 Salamon et al. 3,708,765 Jan. 2, 1972 25 Miller 3~7l9~a76 March 5, 1973 V08tee~ ~, 803,470 Apr. 9, 1974 Pr~ce et al. 3,803,471 Apr. 9, 197~
Ibamoto st al. 3.903,465 Sept. 2, 1975 : Milligan 3.906,31g Sep~. 16, 1975 30 Grace 3,~82,161 Sept. 21, 1976 ~ ' ~
.
:
~ ,:
i ~ - .
~ : .,. : ... .
~ o~
: -2-~ttention is also directed to Canadian Patent 1,211,657 issued September 23, 1986.
SUMMARY OF THE INVENTION
~ The invention provides an electric : 5 outboard motor including a mounting bracket, a dc motor supported by the mounting bracket, a propeller driven by the motor, battery terminal means adapted for connection to a battery, a MOSFET connected to the motor to control operation of the motor and including a gate, a manually operable potentiometer ~; connected to the terminal means, and integrated ~ circuit means including a control input connected to : the potentiometer to vary the voltage applied to the input, and an output connected to the gate oE the M~SFET, which integrated circuit means is operative to produce a pulse train which is applied to the gate : through the output, and to vary the pulse width of ~- the pulse train as the voltage applied to the inpu~
is varied whereby the pulse width of the pulse train ~ 20 at the output and the duty cycle of the MOSFET are :~ varied in accordance with the setting of the :~ potentiometer and the speed of the motor is varied accordingly.
The invention also provides an electric outboard motor including a mounting bracket, a dc motor supported by the mounting bracket, a propeller ~;~; driven by the motor, battery terminal means adapted ~:~ for connection to a battery, a MOSFET connected to :~ the motor to control operation of the motor and including a gate, control means connected to the terminal means, and integrated circuit means including a control input connected to the control means to vary the voltage applied to the input, and an output connected to the gate of the MOSFET, which .
~::
: ~, , ,., .:,.
~:`
~25~3~7~
integrated circuit is operative to produce a pulse train which is appl~ied to the ~ate through the output, and to vary the pulse width oE the pulse train as the voltage applied to the input is varied whereby the dut~ cycle of the pulse train at the output and the pulse width of the MOSFET are varied in accordance with the voltage applied to the input and the speed of the motor is varied accordingly~
The invention also provides an electric outboard motor including a mounting bracket, a dc motor supported by the mounting bracket, a propeller driven by the motor, battery terminal means adapted for connection to a battery, switching means connected to the motor to control operation of the motor and being conductive when a control voltage applied to the switching means exceeds a predetermined value, control means connected to the terminal means, and integrated circuit means including a control input connected to the control means to vary the voltage applied to the inpu~, and an output connected to the switching means to apply a control voltage thereto, which integrated circui~
means is operative to produce at the output a pulse train at a voltage in excess of the predetermined value, and to vary the pulse width of the pulse train as the voltage applied to the input 1~ varied whereby the duty cycle of the pulse train at the output and the pulse width of the switching means are varied in accordance with the voltage applied to the input and the speed of the motor is varied accordingly.
The invention also provides an electric outboard motor including a mounting bracket, a DC
~: motor supported by the mounting bracket~ a propeller driven by the motor, terminal means adapted for connection to a battery, integrated circuit means ';'~' ~ :
~5~ii3~7~3 having an input and an output and operative to produce at the output a variable width pulse train which varies in accordance with variations in voltage applied to the input, a manually operable control potentiometer connected to the terminal means and the input to vary the vcltage applied to the input, a MOSFET serially connected between the motor and the battery and having a gate connected to the output so that the duty cycle o~ the MOSFET is varied solely with variation in the voltage applied to the input by ~; the potentiometer whereby the speed of the motor is varied accordingly.
~-~ BRIEF DESCRIPTION OF THE-DRAWINGS
Fig. 1 is a simplified representation of an electric outboard motor.
Fig. 2 is a simplified showing, partly in section, of the head of the outboard motor shown in Fig. 1 to illustrate the manner in which a potentiometer may be mounted for actuation by twisting movement of the tiller or handle.
Fig 3 is a circuit diagram.
DETAILED DESCRIPTION OF THE DRAWINGS
In the drawings and the following description, various components are identiied by manufacturer's desi~nation or by value. This, coupled with the wiring diagram, will obviate the need for a detailed description of the particular wiring arrangement and components associated with the circuitO The circuit largely will speak for itself with the following description adding such details as necessary to understand the invention.
The electric outboard motor 10 shown in Fig. 1 is typical of the electric outboard motors used Eor trolling. The motor 10 includes a mounting bracket 11 which is connected to a boat and which ,`
,,~
...
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.
~5~7~
supports for rotation a vertical shaft 13, a tiller 16 connected to the upper end of the shaft 13 and a lower housing 12 connected to the lower end of the shaft 13. The motor 10 is very quite and simple to operate. The motor 10 also includes a dc motor which is conveniently mounted in the lower housing 120 The motor is identified by the reference 12 in the circuit diagram of Fig. 3. The motor turns a propeller 14. The motor speed is dependent upon the current applied to the motor.
In the past a stepping resistor has been incorporated in a speed control provided for the motor. If no resistance was placed in the circui~
the motor received full current from the bank of batteries carried on the boat. If resistance was put in a series with the motor the motor received less current and the speed was reduced. Energy, however, was dissipated in the resistance. This represents an undesirable loss and efEectively reduces the available running time of the motor.
Electric outboard motors are usually mounted on the bow or stern of a boat. ~hey either pull or push the boat. Steering is effected by moving the tiller 16 which can also be rotated about its own axis to rotate the shaft of a potentiometer 18, as shown in Fig. 2. The potentlometer 18 forms a part of a speed control 19 for the motor 10.
The potentiometer shaft is rotatable relative to the potentiometer housing which is fixed to prevent rotation but which can move axially back and forth in the motor head for purposes not relevant to the present description. This general type of .
construction is shown in Canadian Patent 1,211,657 issued Septemb~r 23, 1986. Axial movement of the rotary switch can be used to actuate a switch (not ~537~
shown) to control forward and reverse operation of the motor.
The motor speed control 19 includes the potentiometer 18, as previously described, an integrated circuit or chip A which generates a pulse train, timing integrated circuit or chip B which modulates the pulse train, various resistors, capacitors and diodes, as illustrated in Fig. 3, and a switching device 23 in the form of an N-channel enhanced mode Metal Oxide Silicon Field Effect Transistor or MOSFET. In Fig. 3 the potentiometer 18 controls the amount of voltage applied to an input 7 of integrated Circuit B. Integrated Circuit B and Integrated Circuit A are identical except for the manner in which they are hooked up.
Both integrated circuits are generally regarded as timer circuits but are wired differently in this use. Integrated circuit A is wired to operate as an oscillator operating with a 59 microsecond "on1' time and a 1 microsecond "off" time to provide essentially a 20 KHz pulse train at output 3 which is connected to input 2 of the integrated ~; circuit B. Integrated circuit A is powered by a 12 volt supply from battery terminal 20 adapted to be connected to the boat batter~. This terminal 20 provides a 12 volt supply to the potentiometer 18 and, depending upon the setting of the potentiometer, the full 12 volts can be applied to control input 7 of chip B or a lesser voltage can be applied by dropping some of the voltage in the potentiometer.
Chip or integrated circuit B is wired to operate as a variable delay monostable ~- oscillator. The output 3 from chip B provides a :
~, ~ . - . -. , ,; : , ;. .. : ~ , -~ , - .. , ,.,: .
~L25~i~37~
pul~e width modulated 20 KHz pulse train which is applied through resistor 22 and diode 24 to the ga~ce G of the MOSFET 23. The source S of the MOSFE:T i8 connected to ground, and the drain D is connected to 5 the motor lead 26. The other motor lead 2~ is connected to battery terminal 20.
The duty cycle or pulse width of the modulated pulse train present at outpu~ 3 o~
integrated circuit B is variable between 30% and 98 depending upon the set~ing oP the potentiome~er 18.
The voltage applied tc the gate of the ~IOSFE:T 23 is enough to cau e full conduction for the duration of the pulse. By modulating the pulse width the average output of the MOSFET i8 varied to vary the speed.
Full 12 volt supply and no added resi6tance effective at the potentiometer applied to the control input 7 will give full (actually about 9~%) speed and thrust o~ motor 12. The amount of power dis~ipated in the potentiometer is negligable ~o the batt~ry current 20 drain is reduced ~ubstantially while the control : gives a very unifor~ speed change over the ~ull eange. This is contradi~tinction to the stepping type resis~or having the usual four -speed step~.
Due to the nature of an outboard motor ; 25 and the rela~io~hip between motor speed and propeller thru~t (and boat speed) the motor is a~ ably suited to this very cimpls control. There i8 no need for sen6in~ the motor s~eed or vehicle speed or the like. The control is very reliable and afford~ smoother and more economical ~otor operation : than with pa6t control :
: , ~' '; .
' :
BACKGROUND OF THE INVENTION
Elect.ric outboard motors have a dc motor driving the proeeller. The ~otor speed is controlled by placing ~ore or les~ re~istance in ~eries wi~h the ~o~or. The ene~gy di~ipated in the resistance is a los~. It is known that dc motor speed can be controlled by variatio~ o~ the "on" ti~e of the motor. This can be done by placing a ~witching device in the motor power ~upply to ~witch the power on and o~f. The motor ~till receives its rated voltage but for less time. This conce~t has been u~ed in controlling the motor Epeed in vehicles and the control circuits are quite elabolate and a~e : 15 not cost effective for outboard ~otor co~trols. And the control circuits require too much power for outboard motor use.
; At~ention is directed to the ~ollowing U.S. patents directed to motor controls:
20 Pa~entee Patent No. Issued Date : Ninebrener 3,686,549 Aug. 22, 1972 Henry 3,694,721 Sept. 26, 1972 ~: Mc~enna 3,617,845 Nov. 2. 1971 Salamon et al. 3,708,765 Jan. 2, 1972 25 Miller 3~7l9~a76 March 5, 1973 V08tee~ ~, 803,470 Apr. 9, 1974 Pr~ce et al. 3,803,471 Apr. 9, 197~
Ibamoto st al. 3.903,465 Sept. 2, 1975 : Milligan 3.906,31g Sep~. 16, 1975 30 Grace 3,~82,161 Sept. 21, 1976 ~ ' ~
.
:
~ ,:
i ~ - .
~ : .,. : ... .
~ o~
: -2-~ttention is also directed to Canadian Patent 1,211,657 issued September 23, 1986.
SUMMARY OF THE INVENTION
~ The invention provides an electric : 5 outboard motor including a mounting bracket, a dc motor supported by the mounting bracket, a propeller driven by the motor, battery terminal means adapted for connection to a battery, a MOSFET connected to the motor to control operation of the motor and including a gate, a manually operable potentiometer ~; connected to the terminal means, and integrated ~ circuit means including a control input connected to : the potentiometer to vary the voltage applied to the input, and an output connected to the gate oE the M~SFET, which integrated circuit means is operative to produce a pulse train which is applied to the gate : through the output, and to vary the pulse width of ~- the pulse train as the voltage applied to the inpu~
is varied whereby the pulse width of the pulse train ~ 20 at the output and the duty cycle of the MOSFET are :~ varied in accordance with the setting of the :~ potentiometer and the speed of the motor is varied accordingly.
The invention also provides an electric outboard motor including a mounting bracket, a dc motor supported by the mounting bracket, a propeller ~;~; driven by the motor, battery terminal means adapted ~:~ for connection to a battery, a MOSFET connected to :~ the motor to control operation of the motor and including a gate, control means connected to the terminal means, and integrated circuit means including a control input connected to the control means to vary the voltage applied to the input, and an output connected to the gate of the MOSFET, which .
~::
: ~, , ,., .:,.
~:`
~25~3~7~
integrated circuit is operative to produce a pulse train which is appl~ied to the ~ate through the output, and to vary the pulse width oE the pulse train as the voltage applied to the input is varied whereby the dut~ cycle of the pulse train at the output and the pulse width of the MOSFET are varied in accordance with the voltage applied to the input and the speed of the motor is varied accordingly~
The invention also provides an electric outboard motor including a mounting bracket, a dc motor supported by the mounting bracket, a propeller driven by the motor, battery terminal means adapted for connection to a battery, switching means connected to the motor to control operation of the motor and being conductive when a control voltage applied to the switching means exceeds a predetermined value, control means connected to the terminal means, and integrated circuit means including a control input connected to the control means to vary the voltage applied to the inpu~, and an output connected to the switching means to apply a control voltage thereto, which integrated circui~
means is operative to produce at the output a pulse train at a voltage in excess of the predetermined value, and to vary the pulse width of the pulse train as the voltage applied to the input 1~ varied whereby the duty cycle of the pulse train at the output and the pulse width of the switching means are varied in accordance with the voltage applied to the input and the speed of the motor is varied accordingly.
The invention also provides an electric outboard motor including a mounting bracket, a DC
~: motor supported by the mounting bracket~ a propeller driven by the motor, terminal means adapted for connection to a battery, integrated circuit means ';'~' ~ :
~5~ii3~7~3 having an input and an output and operative to produce at the output a variable width pulse train which varies in accordance with variations in voltage applied to the input, a manually operable control potentiometer connected to the terminal means and the input to vary the vcltage applied to the input, a MOSFET serially connected between the motor and the battery and having a gate connected to the output so that the duty cycle o~ the MOSFET is varied solely with variation in the voltage applied to the input by ~; the potentiometer whereby the speed of the motor is varied accordingly.
~-~ BRIEF DESCRIPTION OF THE-DRAWINGS
Fig. 1 is a simplified representation of an electric outboard motor.
Fig. 2 is a simplified showing, partly in section, of the head of the outboard motor shown in Fig. 1 to illustrate the manner in which a potentiometer may be mounted for actuation by twisting movement of the tiller or handle.
Fig 3 is a circuit diagram.
DETAILED DESCRIPTION OF THE DRAWINGS
In the drawings and the following description, various components are identiied by manufacturer's desi~nation or by value. This, coupled with the wiring diagram, will obviate the need for a detailed description of the particular wiring arrangement and components associated with the circuitO The circuit largely will speak for itself with the following description adding such details as necessary to understand the invention.
The electric outboard motor 10 shown in Fig. 1 is typical of the electric outboard motors used Eor trolling. The motor 10 includes a mounting bracket 11 which is connected to a boat and which ,`
,,~
...
~: , ~'~
.
~5~7~
supports for rotation a vertical shaft 13, a tiller 16 connected to the upper end of the shaft 13 and a lower housing 12 connected to the lower end of the shaft 13. The motor 10 is very quite and simple to operate. The motor 10 also includes a dc motor which is conveniently mounted in the lower housing 120 The motor is identified by the reference 12 in the circuit diagram of Fig. 3. The motor turns a propeller 14. The motor speed is dependent upon the current applied to the motor.
In the past a stepping resistor has been incorporated in a speed control provided for the motor. If no resistance was placed in the circui~
the motor received full current from the bank of batteries carried on the boat. If resistance was put in a series with the motor the motor received less current and the speed was reduced. Energy, however, was dissipated in the resistance. This represents an undesirable loss and efEectively reduces the available running time of the motor.
Electric outboard motors are usually mounted on the bow or stern of a boat. ~hey either pull or push the boat. Steering is effected by moving the tiller 16 which can also be rotated about its own axis to rotate the shaft of a potentiometer 18, as shown in Fig. 2. The potentlometer 18 forms a part of a speed control 19 for the motor 10.
The potentiometer shaft is rotatable relative to the potentiometer housing which is fixed to prevent rotation but which can move axially back and forth in the motor head for purposes not relevant to the present description. This general type of .
construction is shown in Canadian Patent 1,211,657 issued Septemb~r 23, 1986. Axial movement of the rotary switch can be used to actuate a switch (not ~537~
shown) to control forward and reverse operation of the motor.
The motor speed control 19 includes the potentiometer 18, as previously described, an integrated circuit or chip A which generates a pulse train, timing integrated circuit or chip B which modulates the pulse train, various resistors, capacitors and diodes, as illustrated in Fig. 3, and a switching device 23 in the form of an N-channel enhanced mode Metal Oxide Silicon Field Effect Transistor or MOSFET. In Fig. 3 the potentiometer 18 controls the amount of voltage applied to an input 7 of integrated Circuit B. Integrated Circuit B and Integrated Circuit A are identical except for the manner in which they are hooked up.
Both integrated circuits are generally regarded as timer circuits but are wired differently in this use. Integrated circuit A is wired to operate as an oscillator operating with a 59 microsecond "on1' time and a 1 microsecond "off" time to provide essentially a 20 KHz pulse train at output 3 which is connected to input 2 of the integrated ~; circuit B. Integrated circuit A is powered by a 12 volt supply from battery terminal 20 adapted to be connected to the boat batter~. This terminal 20 provides a 12 volt supply to the potentiometer 18 and, depending upon the setting of the potentiometer, the full 12 volts can be applied to control input 7 of chip B or a lesser voltage can be applied by dropping some of the voltage in the potentiometer.
Chip or integrated circuit B is wired to operate as a variable delay monostable ~- oscillator. The output 3 from chip B provides a :
~, ~ . - . -. , ,; : , ;. .. : ~ , -~ , - .. , ,.,: .
~L25~i~37~
pul~e width modulated 20 KHz pulse train which is applied through resistor 22 and diode 24 to the ga~ce G of the MOSFET 23. The source S of the MOSFE:T i8 connected to ground, and the drain D is connected to 5 the motor lead 26. The other motor lead 2~ is connected to battery terminal 20.
The duty cycle or pulse width of the modulated pulse train present at outpu~ 3 o~
integrated circuit B is variable between 30% and 98 depending upon the set~ing oP the potentiome~er 18.
The voltage applied tc the gate of the ~IOSFE:T 23 is enough to cau e full conduction for the duration of the pulse. By modulating the pulse width the average output of the MOSFET i8 varied to vary the speed.
Full 12 volt supply and no added resi6tance effective at the potentiometer applied to the control input 7 will give full (actually about 9~%) speed and thrust o~ motor 12. The amount of power dis~ipated in the potentiometer is negligable ~o the batt~ry current 20 drain is reduced ~ubstantially while the control : gives a very unifor~ speed change over the ~ull eange. This is contradi~tinction to the stepping type resis~or having the usual four -speed step~.
Due to the nature of an outboard motor ; 25 and the rela~io~hip between motor speed and propeller thru~t (and boat speed) the motor is a~ ably suited to this very cimpls control. There i8 no need for sen6in~ the motor s~eed or vehicle speed or the like. The control is very reliable and afford~ smoother and more economical ~otor operation : than with pa6t control :
: , ~' '; .
' :
Claims (5)
1. An electric outboard motor including a mounting bracket, a dc motor supported by said mounting bracket, a propeller driven by said motor, battery terminal means adapted for connection to a battery, a MOSFET connected to said motor to control operation of said motor and including a gate, a manually operable potentiometer connected to said terminal means, and integrated circuit means including a control input connected to said potentiometer to vary the voltage applied to said input, and an output connected to said gate of said MOSFET, said integrated circuit means being operative to produce a pulse train which is applied to said gate through said output, and to vary the pulse width of said pulse train as the voltage applied to said input is varied whereby the pulse width of the pulse train at said output and the duty cycle of said MOSFET are varied in accordance with the setting of said potentiometer and the speed of said motor is varied accordingly.
2. An outboard motor according to Claim 1 in which said integrated circuit means includes a first integrated circuit operated as an oscillator to produce a pulse train and also includes a second integrated circuit opearted as a variable delay monostable oscillator receiving said pulse train and producing a pulse train having a variable duty cycle which is applied to said gate.
3. An electric outboard motor including a mounting bracket, a dc motor supported by said mounting bracket, a propeller driven by said motor, battery terminal means adapted for connection to a battery, a MOSFET connected to said motor to control operation of said motor and including a gate, control means connected to said terminal means, and integrated circuit means including a control input connected to said control means to vary the voltage applied to said input, and an output connected to said gate of said MOSFET, said integrated circuit being operative to produce a pulse train which is applied to said gate through said output, and to vary the pulse width of said pulse train as the voltage applied to said input is varied whereby the duty cycle of the pulse train at said output and the pulse width of said MOSFET are varied in accordance with the voltage applied to said input and the speed of said motor is varied accordingly.
4. An electric outboard motor including a mounting bracket, a dc motor supported by said mounting bracket, a propeller driven by said motor, battery terminal means adapted for connection to a battery, switching means connected to said motor to control operation of said motor and being conductive when a control voltage applied to said switching means exceeds a predetermined valuer control means connected to said terminal means, and integrated circuit means including a control input connected to said control means to vary the voltage applied to said input, and an output connected to said switching means to apply a control voltage thereto, said integrated circuit means being operative to produce at said output a pulse train at a voltage in excess of said predetermined value, and to vary the pulse width of said pulse train as the voltage applied to said input is varied whereby the duty cycle of the pulse train at said output and the pulse width of said switching means are varied in accordance with the voltage applied to said input and the speed of said motor is varied accordingly.
5. An electric outboard motor including a mounting bracket, a DC motor supported by said mounting bracket, a propeller driven by said motor, terminal means adapted for connection to a battery, integrated circuit means having an input and an output and operative to produce at said output a variable width pulse train which varies in accordance with variations in voltage applied to said input, a manually operable control potentiometer connected to said terminal means and said input to vary the voltage applied to said input, a MOSFET serially connected between said motor and the battery and having a gate connected to said output so that the duty cycle of said MOSFET is varied solely with variation in the voltage applied to said input by said potentiometer whereby the speed of said motor is varied accordingly.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US68957485A | 1985-01-07 | 1985-01-07 | |
| US689,574 | 1985-01-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1255378A true CA1255378A (en) | 1989-06-06 |
Family
ID=24769047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000499009A Expired CA1255378A (en) | 1985-01-07 | 1986-01-06 | Pulse width modulation dc motor speed control |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS61164490A (en) |
| CA (1) | CA1255378A (en) |
-
1986
- 1986-01-06 CA CA000499009A patent/CA1255378A/en not_active Expired
- 1986-01-07 JP JP61001241A patent/JPS61164490A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61164490A (en) | 1986-07-25 |
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