Inventor

WALKER LOREN H

US57 patents

⚠️ This page may combine multiple inventors who share the name “WALKER LOREN H”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

WALKER LOREN H

GEN ELECTRIC

Control system for a current source converter supplying an AC bus

Coordinated load commutated inverter protection system

Apparatus for sensing current transformer primary current as a function of differential core inductance

Discharge lamp auxiliary circuit with dI/dt switching control

Controlled current inverter and motor control system

Power conversion scheme employing paralleled units

Method and apparatus for matching turn-off times of parallel connected semiconductor switching devices

Thyristor voltage limiter for current source inverter

AC Inverter with constant power output

Rectifier circuits using transistors as rectifying elements

Method and apparatus for achieving current balance in parallel connected switching devices

Apparatus and method for failure testing of a control turn-off semiconductor

Frequency measurement system

Control for a force commutated current source var generator

Flux feedback firing control for a load commutated inverter

Dual mode AC motor drive system

Starting electrodes for solenoidal electric field discharge lamps

Controlled current inverter system having semiconductor overvoltage protection

Reversible variable frequency oscillator for smooth reversing of AC motor drives

Switched MOV device

Control for induction motor drive using load commutated inverter circuit

Twelve-pulse operation of a controlled current inverter motor drive

Controlled current inverter with angle command limit

Apparatus and method for high slip operation of an AC electric motor at substantially zero rotation and substantially zero torque

Apparatus and method for providing a signal proportional to flux in an AC motor for control of motor drive current

Method and apparatus for a variable frequency inverter system having commutation fault detection and correction capabilities

Inverter system including commutation failure prevention scheme

Push-pull inverter ballast for arc discharge lamps

Flux control for induction motor drive using load commutated inverter circuit

Excitation current control for induction motor drive using load commutated inverter circuit

Power conversion scheme employing shorting means to control current magnitude

Capacitance control for a static var generator

Alternating current motor drive having current filter

Cross-tied current regulator for load commutated inverter drives

Protective method and apparatus for a controlled current inverter and motor control system

Method and apparatus for dynamic braking in a motor control system

Zero rotation and zero torque detector and method for an AC electric motor drive

AC Motor drive system having clamped command error signal

Method and apparatus for a variable frequency inverter system having commutation fault detection and correction capabilities

Inverter power conversion system having improved control scheme

Reversible inverter system having improved control scheme

Inverter power supply

Apparatus for starting high pressure gaseous discharge lamps

Induction motor drive using load commutated inverter circuit

Circuit for shutting down an inverter

Method and apparatus for frequency measurement of an alternating current signal

Method and apparatus for determining the resistance of an AC motor stator

Unintentional impedance detection system

Commutation failure correction scheme for a controlled current inverter

ELECTRIC POWER RES INST

Method and apparatus for controlling a power converter