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The ice cream cone was invented at the St. Louis Worlds Fair by Ernest Hamwi in 1904. His waffle booth was next to an ice cream vendor who ran short of dishes. Hamwi rolled a waffle to hold ice cream and the cone was born.
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| Number | Title | Issue Date |
| 7643733 | Control device for driving a brushless DC motor A delta type inverter is used in conjunction with a closed-loop motor controller to provide a control device for driving a three phase brushless direct current motor. The delta inverter has one-half of the solid state switching devices and diodes required by convent... | 01/05/2010 |
| 7359628 | Control device for an electric motor The invention relates to a drive device for an electric motor, in particular for a brushless DC motor in an electrical tool, which is powered by a rechargeable battery. The drive device has at least one power semiconductor, in particular for controllable application... | 04/15/2008 |
| 7348744 | Brushless DC motor drive apparatus A brushless DC motor drive apparatus for driving a rotor includes a drive circuit rotating the rotor, a current shutdown and auto-restart circuit coupled to the drive circuit, and a DC voltage comparison circuit coupled to the current shutdown and auto-restart circu... | 03/25/2008 |
| 7339343 | Method for correcting speed feedback in a motor A method for correcting speed feedback in a drive motor by calculating the averages of speed reference and speed measurement for both downward and upward constant-speed travel and then identifying the gain and zero factors and correcting the measured speed measureme... | 03/04/2008 |
| 7189211 | Massage machine, information recorded medium, program writing method An object of the present invention is to provide a massaging apparatus that faithfully incorporates the rhythm or melody of a music source and performs massage with accents arranged more effectively based on these. A massaging apparatus of the present invention comp... | 03/13/2007 |
| 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 series motor control is conf... | 11/07/2006 |
| 7122982 | DC motor rotation information detecting device A rotation information detection device detects rotation information of a DC motor based on a surge component waveform superimposed on a voltage waveform between the terminals of the DC motor or a current waveform of the DC motor, a circuit is provided which supplie... | 10/17/2006 |
| 7116003 | Aircraft starter/generator electrical system with mixed power architecture A starter/generator electrical system for gas turbine powered aircraft with mixed power architecture to combine advantages of each. The mixed power architecture may be selected from constant frequency (CF), adjustable variable frequency (AVF) and narrow range variab... | 10/03/2006 |
| 7012862 | Tracking error detection apparatus A tracking error detection apparatus includes a phase error detection unit for detecting a phase error of an output signal according to the amount of reflected light that is obtained when a light beam is applied to an information recording medium and a low-band pass... | 03/14/2006 |
| 6965208 | Motor speed detecting device for use between motor and system A motor speed detecting device for use between a motor and a system is provided. A motor speed detecting device for use between a motor and a system includes a first input terminal and a second input terminal, wherein the first and second input terminals are electri... | 11/15/2005 |
| 6873124 | Rotational speed controller for electrically powered tools A rotational speed controller maintains a constant low speed during idling, a constant high speed when a load is applied and controls motor rotational speed in the range between low and high speed to ensure safe operation when used in an electrically powered tool. W... | 03/29/2005 |
| 6380702 | Commutator motor control system The invention relates to a control system for a commutator motor which is operated by phase-fired control. Allocation of a first and second control device in a single operating state without transition makes it possible to obtain constant jolting rotation... | 04/30/2002 |
| 6259224 | Electronic cancellation of DC motor noise An active attenuation system for a DC motor which yields global vibration reduction of slot or other motor induced tonals at the plate on which the motor is mounted without modifying the construction of the motor. The system comprises one or more vibratio... | 07/10/2001 |
| 6031966 | Motor speed control device The motor speed control device of the present invention is provided with an FG sensor and a waveform shaping circuit for obtaining N pulse signals (Nࣙ1 where N is an integer) in one rotation of a motor so as to control the rotation speed of the motor in... | 02/29/2000 |
| 5859511 | Motor with input-controlled high side driver A circuit for operating a polyphase DC motor, such as the type having a plurality of "Y" connected stator coils, has circuitry for charging the coils at a rate which will reduce EMI and other noise, while maintaining an acceptable charge rate. The gate of... | 01/12/1999 |
| 5714861 | Variable speed control for a hand-held electric power tool A power tool has a variable speed control circuit that comprises a user switch, a motor and a silicon controlled rectifier (SCR) connected in series between a pair of power supply terminals. A manually variable resistor is connected between a first electr... | 02/03/1998 |
| 5613259 | High frequency electric toothbrush An electric oscillating tool, having particular but not necessarily exclusive utility as an electric toothbrush, for driving a brush head assembly or end effector with a resonant mechanism at high frequencies. The electric toothbrush includes handle housi... | 03/25/1997 |
| 5610594 | Frequency monitoring device A frequency to be monitored is taken to a counter for the continuous measurement of its cycle time. The counter is so set that, when this frequency drops, i.e. when its cycle time increases, it reaches a certain condition and issues error signals (flags) ... | 03/11/1997 |
| 5512810 | Variable speed control for a hand-held electric power tool A power tool has a variable speed control circuit that comprises a user switch, a motor and a thyristor connected in series between a pair of power supply terminals. A manually variable resistor is connected between a first electrode of the thyristor and ... | 04/30/1996 |
| 5469148 | Frequency monitoring device A frequency to be monitored is taken to a counter for the continuous measurement of its cycle time. The counter is so set that, when this frequency drops, i.e. when its cycle time increases, it reaches a certain condition and issues error signals (flags) ... | 11/21/1995 |
| 5467004 | Motor speed control apparatus for keeping the speed of the motor fixed in the presence of a disturbance torque A motor control apparatus controls a motor speed according to a detected period of a frequency signal whose frequency is in proportion to the motor speed and drives the motor so as to keep its speed fixed according to a drive signal. The motor control app... | 11/14/1995 |
| 5140247 | Control system for polyphase induction machines A system for controlling the start-up sequence of an electric motor includes a contactor relay for supplying polyphase operating voltage to the motor. A plurality of output circuits are respectively coupled between the motor and the relay contacts. Each o... | 08/18/1992 |
| 5029040 | Output circuit having a fail-safe function An output circuit having a fail-safe function with: a control signal generating circuit which generates a control signal to control the current of a load and includes an operational amplifier which amplifies a difference between a control value and a feed... | 07/02/1991 |
| 4855655 | Electromagnetic servo drive for power steering An electromagnetic servo device (200) includes a driving control circuit (100), for an electric motor (20) for producing auxiliary torque to be applied to an output shaft (4). A control signal (Va) is provided to thereby supply an armature current (Io) of... | 08/08/1989 |
| 4748389 | Motor speed control apparatus The motor speed control apparatus of the present invention includes a thyristor (14) connected in the current supply circuit of a motor (13) for phase controlling the motor to control its rotational speed. The determination of the trigger timing of the th... | 05/31/1988 |
| 4710688 | Variable speed control with selectively enabled counter circuits In a sewing machine, a variable speed setting device generates a variable reference speed signal which is applied to a controller. A tachogenerator produces speed pulses at a frequency proportional to the speed of a motor which drives a needle armshaft. T... | 12/01/1987 |
| 4695779 | Motor protection system and process Method and apparatus for providing an electric motor such as used on an oil well pumping unit with stall protection. The system comprises means for generating a signal representative of motor speed and for establishing at least two stall speed set points ... | 09/22/1987 |
| 4695778 | Rotation phase control device A rotation phase control device which synchronizes the rotation phase of the rotor of a motor with a reference signal and which has a steady-state characteristic compensating circuit improves the starting characteristic of the motor by compensating charac... | 09/22/1987 |
| 4684858 | Motor pulse extraction system An improved system is provided for accurately referencing the revolving motion of electric motors used as positioning devices, and is particularly applicable to the automatic positioning and repositioning of ground station antennas in the reception of sat... | 08/04/1987 |
| 4684856 | Method and drive for elevator DC drive motor stabilization A method and device for elevator DC drive motor speed control stabilization system in which current data and speed data are used as feed-back information. The current regulator is approximated by an ideal integrator, and mathematical model thereby obtaine... | 08/04/1987 |
| 4661751 | Well pump control system A well pump control system is disclosed for utilization with a conventional well pump having a stationary member and a reciprocating member. The reciprocating member operates a down-hole pump and is attached to a rocking beam through a load cell. The rock... | 04/28/1987 |
| 4658191 | Motor rotation control apparatus A control apparatus whereby each time a motor adapted to start and stop its rotation repeatedly a plurality of times is rotated, the phase reference of a rotating object is adjusted and the rotating object is locked to a normal speed in a short period of ... | 04/14/1987 |
| 4605884 | Control unit A control unit for a movable member comprises a motor for driving the movable member, a speed detector for detecting a rotating speed of the motor, a reference signal generator, amplifiers of different gains for amplifying a signal representing a phase di... | 08/12/1986 |
| 4591768 | Control system for an electric motor A control system for a motor which drives a tape capstan includes a capacitor (91) which holds a sample of a ramp signal which is sampled and restarted in response to tachometer pulses. The output of an amplifier (90, 100) which amplifies the difference b... | 05/27/1986 |
| 4571529 | Actual speed value converter for the speed control in a motor drive system An actual speed value converter for a motor comprises a tachometer having a part rotating with the speed to be measured, e.g., a capacitive or inductive rotor, or an optical actuator disk, the tachometer determining the frequency of a frequency generator.... | 02/18/1986 |
| 4567409 | Control circuit for motor The disclosed motor control circuit includes a speed loop controlling the rotational speed of the rotor of a motor. A phase control loop controls the rotational phase of the rotor, and a voltage control loop controls a voltage applied to a winding of the ... | 01/28/1986 |
| 4544852 | Circuit arrangement for monitoring speed of a drive motor A circuit for speed monitoring, particularly for fan drives. A detection device for producing an input signal sequence is provided which has a speed-dependent repetition frequency. The circuit also has a signal converter for converting the input signal se... | 10/01/1985 |
| 4498034 | Motor speed control circuit A motor speed control circuit, for example, for the turntable drive motor of a phonograph record player, is of the type having a phase-locked loop including a frequency-divider with a dividing ratio which is changeable for altering the rotational speed of... | 02/05/1985 |
| 4495448 | Means and method of sensing motor rotation speed from stray escaping flux For isolating dynamic rotational signal components from a dominating line frequency component in the stray magnetic fields escaping from the motor, a pick-up probe for instrumentation analyzing the motor characteristics is provided with a feedback winding... | 01/22/1985 |
| 4482850 | Control circuit for DC capstan motor A control circuit is used during slow or stop-motion playback operation of a video tape device to drive video tape intermittently. In order to avoid errors in the stopping position of the tape, a pulse width modulated (PWM) signal is provided to a motor c... | 11/13/1984 |
