DAVID JOHN COUTU
Pilots at Meeks Pt Rd, East Hampton, CT
License number
Connecticut A4770762
Issued Date
May 2015
Expiration Date
May 2017
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
37 Meeks Point Rd, East Hampton, CT 06424
Professional information
Stepper Motor Driver Circuit
US Patent:
5225756, Jul 6, 1993
Filed:
Mar 26, 1992
Appl. No.:
7/858224
Inventors:
David J. Coutu - East Hampton CT
International Classification:
H02P 800
US Classification:
318696
Abstract:
A stepper motor driver circuit applies charging current to one phase of a two-phase stepper motor in a Sine wave configuration while simultaneously applying charging current to the opposing winding in a Cosine wave configuration to carefully control the position of the motor. To reduce memory storage requirements and therefore reduce size and cost, only quarter of the Sine and Cosine waveforms are stored in memory and with additional circuitry, reconstruction of the complete wave form is realized. Furthermore, the resulting circuitry provides the user with a Full Step position output thereby reducing the need for the controlling microprocessor to count micro-steps over long moves to monitor the motor position.
Stepper Motor Driver Circuit
US Patent:
5264770, Nov 23, 1993
Filed:
Mar 12, 1992
Appl. No.:
7/851303
Inventors:
David J. Coutu - East Hampton CT
International Classification:
H02P 800
US Classification:
318696
Abstract:
Applying current to a pair of stepper motor windings on alternating phases of a common drive clock reduces cross-noise in the opposing winding due to current switching which could otherwise cause false triggering of the phase current drivers.
The positional accuracy of the motor is controlled by the selective removal of the current supplied to each motor winding. The falling phase current in one winding is precisely regulated by the time constant determined from the rising phase current phase in the other winding.
Closely monitoring and controlling the phase currents in each motor winding efficiently reduces motor resonance due to self-generation.
Method To Prevent Midrange Resonance During Operation Of A Multi-Phase Step Motor
US Patent:
7154245, Dec 26, 2006
Filed:
Dec 20, 2005
Appl. No.:
11/311867
Inventors:
David Coutu - East Hampton CT, US
Robert A. Fournier - Newington CT, US
Robert A. Fournier - Newington CT, US
Assignee:
IMS Inc. - Malborough CT
International Classification:
H02P 8/00
US Classification:
318696, 318685, 318701
Abstract:
The frequency of the pulse width modulator within a step motor control circuit is increased above a base frequency under defined conditions to enable more accurate construction of the phase current waveform for preventing mid-range resonance. The PWM frequency is stepped between frequencies by a fixed amount above the base frequency, to prevent the excitation of system harmonics and prevent step motor operational instability.
Method To Reduce Midrange Resonance During Operation Of A Multi-Phase Step Motor
US Patent:
2005008, Apr 28, 2005
Filed:
Oct 22, 2003
Appl. No.:
10/689828
Inventors:
David Coutu - East Hampton CT, US
Robert Fournier - Newington CT, US
Robert Fournier - Newington CT, US
International Classification:
H02P008/00
US Classification:
318696000
Abstract:
The frequency of the pulse width modulator within a step motor control circuit is increased above a base frequency under defined conditions to enable more accurate construction of the phase current waveform for reducing mid-range resonance. The PWM frequency is stepped between frequencies by a fixed amount above the base frequency, to reduce the excitation of system harmonics and prevent step motor operational instability.
Electric Stepper Motor Having A Cylindrical Magnetic Rotor With A Pair Of Cups Made Of Magnetic Material
US Patent:
6002186, Dec 14, 1999
Filed:
Jul 13, 1998
Appl. No.:
9/114403
Inventors:
David Coutu - East Hampton CT
Allen Bennett - Vista CA
Allen Bennett - Vista CA
Assignee:
IMS Inc. - Malborough CT
International Classification:
H02K 3700
US Classification:
310 49R
Abstract:
An electric stepper motor includes a thru-hole, a rotor and a stator. The rotor consists of a pair of hollow magnetic metal flange-shaped laminations arranged within a hollow magnetic sleeve. The motor can be field-converted from rotary to lineal translation by attachment of a threaded nut to the motor shaft mounting face. The thru-hole allows use with a chamber and provides transport of hardware and elements into the chamber.
Method And Apparatus For Improved Low Current Accuracy In Multi-Phase Step Motors
US Patent:
6867566, Mar 15, 2005
Filed:
Aug 15, 2003
Appl. No.:
10/641849
Inventors:
David Coutu - East Hampton CT, US
Robert A. Fournier - Newington CT, US
Robert A. Fournier - Newington CT, US
Assignee:
IMS Inc. - Marlborough CT
International Classification:
H02P008/00, G05B019/40
US Classification:
318696, 318685
Abstract:
The sense signal, which is used to indicate that the motor phase current in a stepper motor is at the set point, is marked both before and after each pulse width modulator edge thereby reducing susceptibility to commutation noise from any phase. A mask time is created for a period before and after a PWM edge. The phase current is balanced during this mask time by removing and replacing the phase current.
Method And Apparatus For Independently Controlling Each Phase Of A Multi-Phase Step Motor
US Patent:
6879128, Apr 12, 2005
Filed:
Jul 28, 2003
Appl. No.:
10/628122
Inventors:
David Coutu - East Hampton CT, US
Robert A. Fournier - Newington CT, US
Robert A. Fournier - Newington CT, US
Assignee:
IMS Inc. - Marlborough CT
International Classification:
G05B019/40
US Classification:
318685, 318696, 318254, 318138, 318439, 318599, 318811, 363 76, 363 95, 363 97, 363 98
Abstract:
The current in each phase of a multi-phase step motor is monitored and the excess phase current above the set point current, as required on a cycle-by-cycle PWM basis, is reduced thereby bringing each phase current down to the set point. The PWM frequency is automatically adjusted to maintain a minimum number of PWM edges within a portion of the current waveform. A maximum charge/discharge time is specified as a percentage of the PWM period. These provide an accurate independent current control within each phase of a multiphase step motor.
Method For Driving A High Side P-Channel Mosfet
US Patent:
6897706, May 24, 2005
Filed:
Feb 13, 2003
Appl. No.:
10/364843
Inventors:
David Coutu - East Hampton CT, US
Assignee:
IMP Inc. - Plainville CT
International Classification:
H03K017/56
US Classification:
327423, 327424, 327427
Abstract:
A P-CHANNEL MOSFET is configured as a high side switch by arranging a capacitor between the P-CHANNEL MOSFET gate and a pair of push/pull transistors in a control circuit. A pull-up resistor is connected with the high side supply, one leg of the capacitor and with the gate of the P-CHANNEL MOSFET. In a two-phase electrical drive circuit, a pair of P-CHANNEL MOSFETS is connected with the high side supply and a pair of N-CHANNEL MOSFETS is connected with the low side supply.
Universal Optically Isolated Input Circuit
US Patent:
2004007, Apr 22, 2004
Filed:
May 15, 2002
Appl. No.:
10/166354
Inventors:
David Coutu - East Hampton CT, US
International Classification:
H02H007/00
US Classification:
361/018000
Abstract:
The invention comprises a printed circuit board having diode steering logic at the input and an optical coupler arrangement at the output thereof. A constant current source is arranged intermediate the diode steering logic and the optical coupler to maintain a constant current source to the optical coupler that is independent of input voltage.
Thermally Efficient Motor Housing Assembly
US Patent:
7242593, Jul 10, 2007
Filed:
Jul 8, 2005
Appl. No.:
11/176904
Inventors:
David Coutu - East Hampton CT, US
Assignee:
IMS Inc. - Marlborough CT
International Classification:
H05K 7/14, H05K 7/18
US Classification:
361800, 361715, 361703
Abstract:
A thermally efficient motor housing assembly including a plurality of transistors and a printed wire board (pwb) for controlling a stepper motor and also including a plunger array and a spring array along with a combined heat sink and pwb enclosure.