SIMYON PALMIN
Broker in Sharon, MA

4675590, Jun 23, 1987

May 23, 1985

6/737235

John Pellegrino - Quincy MA
Simyon Palmin - Sharon MA

Sigma Instruments, Inc. - Braintree MA

H02P 800

318696

In the disclosed stepping motor system a band pass filter extracts error signals from currents in a stepping motor driver, and a feedback system delays command pulses to the driver on the basis of the error signals. This suppresses mid-frequency instabilities in the operation of the stepping motor.

4703238, Oct 27, 1987

Jan 13, 1987

7/002797

Simyon Palmin - Sharon MA
Brian Hewson - North Attleboro MA

Design Components, Incorporated - Franklin MA

G05B 902

318563

An amplifier system for energizing a d. c. motor from a power source in response to an error signal includes a bridge circuit including a first switching transistor pair for supplying a first current from the power source through the motor in one direction and a second switching transistor pair for supplying a second current from the power source through the motor in the opposite direction. A zero crossing detector determines the sign of the error signal and enables the first transistor pair when the error is positive and enables the second transistor pair when the error is negative. A current sensing resistor senses the first and second currents through the motor and provides a motor current signal representative thereof. An absolute value circuit provides an absolute value error signal representative of the magnitude of the error signal. A comparator means compares the motor current signal with the absolute value error signal and inhibits both the first and second transistor pairs when the motor current signal exceeds the absolute value error signal, thereby deenergizing the motor.

4714867, Dec 22, 1987

Sep 30, 1986

6/913537

Simyon Palmin - Sharon MA
Vladimir Shlain - Brookline MA

Design Components Incorporated - Franklin MA

H02P 800

318696

A stepper motor is accelerated and decelerated with a parabolic velocity profile to efficiently utilize the available torque of the motor. The times between pulses to obtain a parabolic velocity profile are determined by a microprocessor-based stepper motor controller from desired values of start/stop velocity, maximum velocity and time to reach maximum velocity. The required times are stored in a random access memory and are used to supply to the motor a pulse train which follows the parabolic velocity profile during acceleration and deceleration. The controller is easily programmable to accommodate different motor characteristics, different applications and different operating parameters.

4682092, Jul 21, 1987

Jun 6, 1985

6/741877

John Pellegrino - Quincy MA
Simyon Palmin - Sharon MA

H02K 1910

318696

In the disclosed system, a switching circuit energized from a source applies current pulses to the windings of a motor, such as a stepping motor. A chopper regulates the winding currents during each current pulse through four or more control cycles, a power cycle, a circulating cycle, a reset cycle and a second circulating cycle. The chopper enables current from the source to the winding during the power cycle; disables the source and forces residual current entirely within the switching circuit and outside the source during the circulating cycles; and constrains current flow from the winding through the source against the plurality of the source during the reset cycle. Preferably, a second switching circuit energizes a second winding and the chopper times the cycles so that the power cycle in one winding coincides with the reset cycle in the other winding.