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4443724 |
Shaft transducer having DC output proportional to angular velocity
A brushless DC tachometer is disclosed that includes a high strength toroidal permanent magnet (25) for providing a uniform magnetic field in an air gap, an annular pole piece (21) opposite the...
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4434448 |
Non-contaminating transformer oil pump, static arrester, and control circuit
A transformer motor pump unit for circulating a fluid in a transformer characterized by a rotating pump shaft mounted in non-electrically conductive bearings, means for detecting shaft displacement...
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4401419 |
Motor-compressor
A motor-compressor for a refrigerator includes a housing containing a lubricant and a reciprocating compressor driven by a direct-current electric motor having a disc-shaped rotor and stator. The...
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4366402 |
Cylindrical capacitive tachogenerator
A cylindrical capacitive tachometer generator having a rotor and a stator, and a cylindrical air gap between facing cylindrical surfaces of the rotor and stator, each provided with equal numbers of...
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4349758 |
Modular hand mixer
A modulator motor and drive unit for use in an electrical device, such as a hand food mixer, wherein the motor is characterized by a low-cost speed control which is capable of providing a large...
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4336517 |
Revolution detecting device
A device for detecting a revolution number of a connection shaft is disclosed. The device comprises a permanent magnet body attached to the connection shaft and a pulse generating means disposed...
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4320317 |
Motor overload safety device
A rotor of a motor has a bearing mounted thereon, the bearing having a tab which is urged in one direction by the fluid friction of the lubricant in the bearing, the tab being urged against a...
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4320431 |
Fluid circulating pump
Fluid-cooled electrical apparatus having a new and improved pump for circulating the fluid within the apparatus. The pump has a motor portion in fluid communication with a pump portion,...
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4315174 |
Reversible d.c. motor with over-drive prevention switches
A reversible d.c. motor adjusts the position to which a carburetor throttle valve closes. The throttle valve is mounted on a throttle shaft to one end of which is attached a throttle lever. The...
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4308477 |
Starting resistance for a rotating electrical machine
A rotating starting resistance for a rotating electrical machine is disclosed. The resistance includes a helicoidal resistance wire that is wound in the shape of a torus, and connected to the...
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4286184 |
Electronic motor having a multi-pole external rotor
An electronic motor has a multi-pole external rotor and a multi-slot stator which is rotatable inside the external rotor. At least two magnetic field sensing elements are arranged in the vicinity...
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4260918 |
Explosion proof submersible gearmotor
An explosion proof submersible gearmotor in which a gear reducer has a housing with a sealed chamber and input and output shafts with a gear train connecting the input and output shafts, and in...
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4259603 |
Electric motor
An electric motor comprising a stator block or assembly having stator windings and a control circuit substrate for supplying driving current thereto mounted integrally with the stator block, a...
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4242608 |
Motor using Hall effect elements
A motor using Hall effect elements is disclosed, in which a disk-shaped multi-pole magnet which is circumferentially divided into a plurality of magnetic poles each magnetized in an opposite...
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4229728 |
Tire pressure monitor
Tire pressure monitors are incorporated in vehicles having pneumatic tires to continuously or periodically measure the air pressure in the tires and to alert the driver should the pressure in one...
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4219747 |
Mechanical apparatus for activating no load current limiting circuits in electric motors
A mechanical switch is provided which, in a first position connects a current limiting circuit to a motor and, in a second position, disconnects the current limiting circuit from the motor....
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4214179 |
Rotor imbalance detector for a centrifuge
An improved rotor imbalance detector for a centrifuge comprising a rotatable electrically conducting ring; means to support and insulate the conducting ring from the centrifuge spindle shaft, and...
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4213069 |
Electric motor
An electric motor is disclosed having stator and magnetic field gradients that taper from strong to weak. The stator is divided into north and south pole sections which each define half of a...
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4115715 |
Brushless d. c. motor
In a brushless d.c. motor with a permanent magnet rotor with the recessing of a radial narrow air gap, a part of the flux emanating from the rotor is concentrated onto a stationary magnetic flux...
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4088908 |
Photoelectric position sensor of step motor
In a photoelectric position sensor of a step motor a mirror pyramid is placed across the light beam from a light source and secured on the shaft of the step motor. The faces of the mirror pyramid...
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4086519 |
Hall effect shaft angle position encoder
A Hall effect shaft angle position encoder is constructed using a plurality of magnetic elements independent of any magnetic rotor of the electrical device which may be a brushless motor or...
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4085345 |
Torque-limiting stop device
A reversible electric motor has a torque limiting stop device actuable to stop the motor by angular displacement of the motor casing when an opposing torque on the motor shaft exceeds a threshold...
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4082968 |
Speed detector for use on a dc motor
A speed detector, particularly useful on a permanent magnet DC motor, for providing a pulse indication from movement of the rotor teeth. During one revolution of the motor, a pulse is provided for...
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4063600 |
Power tool safety mechanism
In a portable motor driven tool such as a drill, a handle is connected to the housing in a manner permitting limited relative movement, in particular pivotal movement, between housing and handle....
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4049986 |
Rotational speed to impulse frequency converter
An apparatus for converting the rotational speed of a shaft, particularly of the driving shaft of a log propeller shaft into a proportional impulse frequency is provided with a rotary permanent...
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4033077 |
Portable power angle tool and switch mechanism
A portable power angle tool includes a housing and an operating head for performing work on a workpiece. A power source supplies energy for the operating head and a switch mechanism includes a...
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4025808 |
Commutating machine with integral speed control
A motor or generator having a commutator and brushes for transfer of current to and from rotor windings has a stationary conducting sensor in sliding contact with the commutator, said sensor being...
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4005843 |
Hanging display rotator
A rotator for a hanging display such as a mobile, hanging plant or the like having a self-contained power supply. The apparatus comprises a cylinder for containing flashlight batteries adjacent one...
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3930133 |
Limit switch assembly
A limit switch assembly is disclosed in this application and includes a slider member adapted to slide with axial movement of an input shaft and having at least one adjustable cam member carried...
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3825182 |
CONTROL DEVICES FOR DAMPERS AND THE LIKE
A control device is provided for dampers and the like which are adapted to be installed in a duct system whereby the combined control device and damper function as an air valve to control the flow...
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3676723 |
HIGH SPEED CENTRIFUGE DRIVE ASSEMBLY
A drive assembly for a motor driven centrifuge, or other rotatable mechanisms, is provided which includes a resilient rotatably driven spindle. The rotating spindle and centrifuge rotor normally...
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3662196 |
MAGNETICALLY COMMUTATED BRUSHLESS D.C. TORQUE MOTOR
A brushless direct current motor operating through the interaction of a permanent magnet field with a commutated electro-magnetic field of changing polarity wherein current is carried from the...
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3603869 |
DEVICE FOR PRODUCING DIRECT VOLTAGE PROPORTIONAL TO SPEED
A rotatable actuator is mounted on the rotor of an AC machine for rotation therewith. A pair of spaced transmitters are stationarily mounted on the stator of the AC machine in operative proximity...
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3590353 |
ELECTRONICALLY COMMUTATED MOTOR HAVING AN OUTSIDE ROTOR AND AN INSIDE POSITION DETECTOR
An electronically commutated motor having a multiple pole permanent magnet rotor. A position detecting means is located inside of the stator. This arrangement makes it easy to fabricate the stator...
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3378744 |
Slip detection circuit
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3201425 |
20-alkoxy-delta20-21-carboxaldehydes of the pregnane series and method of preparing the same
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3080494 |
Switching motor
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3000068 |
Guy line grab device
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2972708 |
Protective means for submersible pump-motors
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2793305 |
Portable electric machine having a rotating tool
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