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7262570 |
Motor controller with enhanced noise immunity unbuffered hall sensors
A method and apparatus of interfacing a Hall sensor to a commutation circuit comprises receiving output signals from the Hall sensor; detecting when the Hall sensor output signals are within a...
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7132808 |
Solid state series motor control
A solid state series motor control includes first and second FORWARD DRIVE elements, first and second REVERSE DRIVE elements, first and second diodes, a current sensor, and a capacitance. The...
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7129657 |
Single track brush-based position encoder for rotating shaft
A position sensor generates a signal representative of the angular position and, if desired, angular velocity of a rotating object using only a single circular track and plural brushes that ride on...
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7106013 |
Motor drive apparatus driving 3-phase brushless motor without using hall sensor
A motor drive apparatus includes a comparison circuit comparing voltages of 3-phase coil terminals and the voltage of a neutral point terminal of a 3-phase brushless motor to determine which...
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7064509 |
Apparatus for DC motor position detection with capacitive ripple current extraction
An apparatus for determining angular positions of DC motor includes a capacitor connected in parallel with the DC motor. The current flowing through the capacitor, at any given time, is an AC...
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6888332 |
Computer system and method of controlling rotation speed of cooling fan
A computer system includes a first heat generating element in which a heat generation amount is changed, a second heat generating element, a fan configured to cool the first and second heat...
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6741047 |
Dual current-limiting circuit for DC brushless motor
A dual current-limiting circuit for a dc brushless motor includes an over-current detective circuit, an operation detective circuit, and a current-limiting circuit. The over-current detective...
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6690128 |
Drive system for domestic appliances
A drive system for a domestic appliance provides inner and outer coaxial drive outlets operative at different speeds and comprises an active limb, which incorporates an electric drive motor and a...
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6664750 |
D.C. motor bridge coil driver
An H-type motor bridge coil driver circuit is implemented with an electronic switch in each leg segment of an H-shaped circuit, this bridge circuit having its side legs each connected between a...
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6396228 |
Motor operator for a circuit breaker
In the three-terminal motor operator of the present invention, current flowing through half coil causes the rotor to rotate in a first direction, and current flowing through half coil causes the...
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6353297 |
Series motor
A series motor with commutator is disclosed which is especially suited as universal motor for a braked power tool. The series motor comprises a switch for switching between a motor mode and a...
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6121788 |
Method and fixture for evaluating stator core quality in production
A fixture to evaluate stator production quality is placed about a stator core so as to introduce a test winding about the stator without need for hand winding. The fixture includes an inner annulus...
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6078152 |
Bidirectional E.C. motor and method of operating the motor
In a method of starting a two-pulse electronically commutated dc motor, which is designed for operation in a preferred direction, for purposes of startup in a desired direction, the following steps...
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6064162 |
Circuit for automatic operation of a series brake upon power loss during a regenerative braking period
An anti-regeneration circuit for preventing a regenerated current produced by an overhauling DC motor from setting a series brake. The anti-regeneration circuit includes a current blocking device...
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6013993 |
Braking circuit for a universal motor
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5994860 |
Series wound motor with electrical brake
In a series-wound motor with electric brake, which comprises an armature provided with an armature winding and at least two exciter coils mounted on pole shoes as well as switchgear which, in the...
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5811945 |
Traveling gear with oscillation damping
A travel drive for a trolley traveling gear of hoists has a drive train which has the properties of a freewheel as regards the direction of travel. Consequently load oscillation can be rapidly...
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5708333 |
Series-wound motor with a braking element
A series-wound motor, wherein, for braking purposes, the polarity of the armature of the motor is reversed for the opposite direction of rotation. The current supply for the motor is maintained...
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5577153 |
High frequency control circuit for DC motors, particularly for washing machines
A control circuit for a series type dc motor. The control circuit uses a switching cell to control motor speed. The switching cell and motor receive power from a filtered dc supply. A tachometer...
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5453673 |
DC motor with auxiliary exciting power supply for switching-on series (or compound) start of shunt normal operation according to the load
A motor control circuit includes a series motor made up of a series field winding serially connected with an armature or a compound motor having both a series field winding and a shunt field...
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5311108 |
Control system for unidirectional motor having improved dynamic braking
Motor control system for unidirectional series DC electric motor having improved dynamic braking performance for smoothly, rapidly and predictably stopping the motor armature so that any operated...
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4730149 |
Circuit arrangement for regulating the rpm of a series motor
A circuit arrangement for regulating the rpm of an electric motor having series connected field and armature windings 1, 4 comprises a controllable rectifier 5 which is connected in series with the...
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4639647 |
Four quadrant control of series motors
A method of controlling and a controller for controlling at least one series motor is provided. Rectifier means is connected in series with the motor so that current through a field winding of the...
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4638226 |
Speed control system with feedback and soft-start
A motor (M) supplied by AC full-wave voltage is controlled by a triac (Q2) under the control of a double-time constant triggering circuit which has a speed setting branch (R3-C2) connected at the...
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4442385 |
Variable frequency drive for a motor-generator/alternator set
A variable frequency drive for a motor-generator/alternator set which is used to supply electrical power to computer or data processing equipment. Power failures in commercially supplied power...
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4409528 |
Motor speed control circuit providing armature current sensing and feedback action for each half cycle and control circuit reducing energy consumption of induction motors when running under no load and light loading
A motor speed control circuit in which a source of alternating current (AC), a universal-type motor, a triac and a large capacitor are connected in series, with the armature current flowing through...
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4284933 |
Control circuit for reducing field voltage in D.C. motors
A circuit arrangement is disclosed for reducing field voltage peaks in direct current motors which are energized by way of an electronic D.C. regulator, and which have an exciter winding connected...
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4181876 |
Speed control circuit for electric motors
The speed control circuit comprises a full wave rectifier having its output connected to an adjustable D.C. voltage divider. A series circuit connected to an A.C. power source includes an electric...
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4002961 |
Electronic switch for controlling the speed of a motor
An electronic switch for variably controlling the speed of an electric motor, comprising a stationary member, a trigger member, clip means for securing said trigger member slidably relative to said...
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3980936 |
D.C. control circuits
A d.c. control circuit includes a slew-rate limiting circuit interposed between a current sensing device which detects current in a load and a control circuit, for switching on and off a thyristor...
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3914672 |
Chopper control system
A chopper is connected in series between a d.c. power supply and a d.c. motor for controlling the speed of the d.c. motor. Means for controlling the chopper comprises a magnetic multivibrator and a...
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3906317 |
Control for DC series-wound motor
An apparatus for controlling the DC series-wound motor of an electric car or electric automobile by means of a thyristor chopper, characterized in that a commutating (auxiliary) thyristor of the...
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3890549 |
Pulse control system power circuit
A power circuit for DC-to-DC pulse control or chopper systems. A pair of unidirectional conduction devices are each connected to a common end of a capacitor; one device couples the capacitor across...
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3875485 |
Speed control system for a-c motors, which slows motor down when in overspeed condition and stops motor when in underspeed condition
A bridge network has three resistance branches, the fourth branch being formed by the armature winding of the motor which, typically, is a series motor. Unbalance of the bridge is sensed and...
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3739205 |
BRUSH AND SPRING HOLDER ASSEMBLY
In a preferred form, this disclosure relates to a brush and spring holder assembly for a dynamoelectric machine having a housing, a current collector and a brush for engaging the current collector...
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3673481 |
DYNAMIC BRAKING FOR UNIVERSAL MOTORS
A dynamic braking system for universal electric motors operating on alternating current is disclosed which utilizes the discharge of a condenser to momentarily energize the series field of the...
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3586941 |
COMPENSATING SYSTEM FOR A SERIES SERVOMOTOR
A compensating system for a series servomotor which improves various characteristics of the motor by causing same to operate as a separately excited motor when its control voltage is low and as a...
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3582745 |
SPEED CONTROL CIRCUIT MOTOR
This invention is concerned with a speed control for an electric motor which has been devised after noticing that the motor current increases or decreases approximately in proportion to the size of...
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3562618 |
TORQUE CONTROL CIRCUIT FOR ELECTRIC MOTORS
A torque control circuit wherein a silicon controlled rectifier is connected in series with the field and armature of an electric motor and is gated by a pickup winding which is magnetically...
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3562611 |
STATIC SWITCHING CONTROLLERS FOR EFFECTING REPETITIVE CONNECTION TO AND DISCONNECTION FROM AN INDUCTIVE LOAD OF A DC SOURCE
Static switching controller using a thyristor to connect a DC source to a load there being provided control means to render the thyristor conducting, a commutating capacitor adapted to be charged...
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3503352 |
AUTOMATIC POSITIONERS FOR ELECTRICALLY DRIVEN FAMILY SEWING MACHINES
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3504256 |
MOTOR SPEED CONTROL CIRCUIT ARRANGEMENT
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3475670 |
CONTROL CIRCUIT
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3474319 |
SOLID STATE MOTOR CONTROL
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3470439 |
RECTIFIER CONTROL CIRCUIT FOR MOTOR CONTROL
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3393353 |
Motor speed control system
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3389318 |
Control systems for electrically driven vehicles having controlled rectifiers operative in response to motor current
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3377536 |
Electric driving device with controlled speed
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3364409 |
Control system for a direct-current motor
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3360705 |
Dc motor field control circuit
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