Abstract: The present disclosure provides a split-type automatic lifting bracket device and a sanitary product. The split-type automatic lifting bracket device comprises an upper bracket assembly and a lower bracket assembly, wherein the upper bracket assembly is used for bearing a water receiver or a waterway control valve; and the lower bracket assembly is used for bearing or supporting and driving a sanitary product to rise and descend, and comprises a self-supporting leg assembly, an auxiliary standing device, an automatic lifting control device, a lifting bracket, a push-pull power device, a rolling guide device, and the sanitary product. The lifting structure of the present application can rise and descend automatically without an additional force to assist in height adjustment. The water receiver and other structures are not provided on the lifting bracket, so that a weight for the lifting structure to rise is reduced.

Abstract: An electric submersible pump (ESP) variable speed drive (VSD) controller is described. A VSD control system includes a pump assembly including an induction motor operatively coupled to a pump, a power cable and a transformer electrically coupled between the induction motor and a VSD controller that controls a speed of the induction motor, the VSD controller including a converter section that sends a direct current (DC), a DC link including a DC smoothing capacitor that smooths the DC, an inverter that converts the smoothed DC to a pulse width modulated (PWM) output voltage, the inverter including at least one silicon carbide (SiC) power semiconductor module, and a PWM filter that filters the PWM output voltage to produce near sinusoidal voltages, the PWM filter including inductors, and the PWM filter sending voltage to the transformer.

Abstract: A system in which the operation of an electric motor is controlled by electronically controlled switches. The system includes the motor having a run winding and a start winding, a heating component, and a motor control subsystem. A control unit closes a first switch to energize the run winding, closes a second switch to energize the start winding, determines based on an amplitude and a lag time of a current flowing through the motor whether the motor has started and is running normally, and if so, opens the second switch to de-energize the start winding and closes a third switch to activate the heating component. The control unit determines whether the motor has started and is running normally by comparing the real time amplitude and lag time of the current to a plurality of stored amplitudes and lag times associated with different operating conditions.

Abstract: A rotor for an electric motor has an iron core and a winding wound about teeth of the rotor core. Slots are formed between the teeth to accommodate coils of the winding. The winding includes several layers of windings distributed in the radial direction of the rotor. Each winding layer has a plurality of coils with the coils of each winding layer being wound on the teeth in the circumferential direction of the rotor. The overall center of gravity of the winding layers is substantially positioned at the geometric center of the rotor. Thus the center of gravity of the entire winding is located substantially at the geometric center of the rotor, thereby preventing noise caused by unstable rotation due to the deviation between the center of gravity of the winding and the geometric center of the rotor.

Abstract: An overspeed protection subsystem is provided for a power tool having an electric motor. The overspeed protection subsystem is comprised of: a motor switch coupled in series with the motor; a motor control module interfaced with the motor switch to control switching operation of the motor switch; and an overspeed detection module that determines rotational speed of the motor and disables the power tool when the rotational speed of the motor exceeds a threshold.

Abstract: A ceiling fan motor with a switch device for controlling rotation speed and direction includes a motor starting capacitor, a multi-stage switch and an AC power source. The motor has a main coil and a secondary coil. The motor starting capacitor is electrically connected between the main and secondary coils. The multi-stage switch includes a common contact, at least one rotation speed contact electrically connected to a second main contact of the main coil, a rotation direction contact electrically connected to a second secondary contact of the secondary coil, and a conductive member having a first conductive end electrically connected to the common contact and a second conducive end electrically connected to the rotation speed or direction contact. The motor starting capacitor cooperates with the multi-stage switch to control rotation speed and direction of the ceiling fan without requiring the use of a rotation direction switch or remoter controller.

Abstract: A single-phase induction motor and a method for reducing noise in the same, which can eliminate unbalance between magnetomotive forces of main and auxiliary windings in a stator of the motor, thereby implementing a low noise, low vibration motor, and can also achieve balance between the magnetomotive forces of the stator windings in the entire running range of the motor, and can further achieve balance between the magnetomotive forces of the stator windings on the basis of temperature increase of the motor as it runs. The amplitude of a main-winding current flowing through the main winding in the stator is controlled to be equal to the amplitude of an auxiliary-winding current flowing through the auxiliary winding in the stator, and the phase difference between the main-winding and auxiliary-winding currents is controlled to be maintained at a predetermined value.

Abstract: An electromagnetic motor with increased torque. The motor has a rotor coil configured to generate a magnetic field. At least two stator coils are connected in series with the rotor coil. Each of the stator coils is configured to generate a respective magnetic field. The motor further includes a plurality of switches configured to generate the magnetic field in each of the respective rotor and stator coils. The switches are configured to generate the magnetic field in the stator coils such that the rotor coil rotates in response thereto. By having the rotor and stator coils connected in series, the torque of the motor is increased.

Abstract: An induction motor system operable in a wet environment comprises an induction motor and an apparatus for controlling the speed of the motor. The motor is adapted to be coupled to an AC source for supplying an AC signal. The motor includes a rotor having rotor laminations. The reflected rotor resistance over reflected rotor reactance ratio of the motor is adjusted to be greater than one. The controlling apparatus includes a switching device, user controls, controller means and isolation means. The switching device is connected in series with the motor and is operative in either a high impedance state wherein significant current flow through the motor is prevented or a low impedance state wherein current flow through the motor is substantially undisturbed. The user controls provide motor speed input signals.

Abstract: A driving control circuit of a hood motor, including: a hood motor section rotatably driven for ventilating the inner portion of a system; a rectifier circuit section for supplying direct current power to the hood motor by rectifying alternating current power, a controlling section for generating a control signal for controlling the operation of the hood motor; and a driving circuit section for controlling the operation of the hood motor according to the control signal from the controlling section.

Abstract: In a method for controlling an electric motor the stator voltage frequency of the motor is determined by adding the optimal slip frequency of the motor and the desired rotational frequency of the rotor. The magnitude of the stator voltage is determined by subtracting the actual rotational frequency and the desired rotational frequency of the rotor. The desired stator frequency and magnitude are inputted into a pulse width modulation unit which controls an inverter to supply the appropriate voltages to the motor. The operation of the motor with optimal slip has the advantage that the efficiency is optimal independent of the load.

Abstract: An inverter controlled conveying/measuring apparatus according to the invention includes a conveyor (3) for conveying an object (W) of measurement. The conveyor (3) is driven by an AC motor (M2). Inverter (20) controls and operates the conveyor (3) at a given speed by supplying the AC motor (M2) with frequency converting signals according to a specified frequency. A measuring section (4) is arranged on a conveying path of the conveyor (3) in order to measure an attribute of the object (W) being conveyed by the conveyor (3).

Abstract: An emergency power circuit powers an induction motor which has at least first and second windings. The motor is normally operating at a normal speed determined by connection to commercial frequency power line, but which is subject to failure. During failure the emergency power circuit is used to supply emergency power from a DC storage battery. An inverter is supplied by the battery and has an output connectable to the motor. A control circuit for the inverter establishes a first frequency to run the motor at a running speed which is considerably less than the normal speed. Single, two-phase and three-phase systems are disclosed as well as a soft start system to start the motor at about one-fourth speed and run it at one-half speed. Preferably a high frequency oscillator is used with the frequency divided dozen to operate the motor at a speed below normal 60 Hz energization speed.

Abstract: A three-phase induction motor is driven efficiently from a single-phase power supply by reconnecting the motor windings and using two or more capacitors to provide balanced currents and voltages in the windings at preselected values of power. A similar method is used to drive a three-terminal conventional motor from a single-phase supply by using a tapped autotransformer with two different voltages and two different capacitors to excite the third motor terminal. Capacitor switching in all embodiments is controlled by feedback from the voltage across the winding with capacitor excitation.

Abstract: A relatively compact static phase converter is adapted to be disposed within the housing of an appliance, such as a refrigeration unit, making it thus suitable for residential as well as commercial applications. The static phase converter is formed as a modular unit to occupy a relatively small volume, for example, 0.5 cubic feet or less, and is adapted to be disposed adjacent the compressor compartment in a typical refrigeration unit with minimal modification. The static converter includes a balancing coil adapted to be coupled across a source of single phase electrical power, such as 120 volts AC. Two phases of a three phase electrical motor are adapted to be connected in parallel across the balancing coil. The third phase is adapted to be connected to the center phase by way of a running capacitor. Starting circuitry which includes a starting capacitor as well as a control relay is included.

Abstract: A control device is provided for an alternating current motor operating in single phase and having first and second windings coupled so that they are shifted in phase with respect to each other. A control unit includes first and second switching elements located between a line connection and respective first and second windings of the motor. One of the switching elements is open and the other closed in a switching state of the control unit, depending on the running direction of the motor. At least one of the switching elements is open when the control unit is in a state of rest. A power supply unit is provided for providing electric energy to the control unit. When the control unit is in a state of rest, the power supply operates by drawing on a first potential difference between a line connection and winding connection associated with the switching element that is open in the state of rest.

Abstract: An induction machine having a stator carrying phase coils divided into at least two independently fed sets of coils, with a rotor or armature carrying one or more loop members, each of which is a short-circuited, continuous isolated loop conductor member having elements thereof positioned and received within the slots of the armature in a generally serpentine configuration forming at least two open loop portions, each loop portion being in a spatially related position to a corresponding coil of the stator structure, with each conductor element within a slot phasing or linking the fluxes of one stator pole. The machine may be single phase or polyphase. At least one stator phase coil of a set includes a controllable device in circuit relation therewith to enable control of one stator coil relative to the other, either in current magnitude or in current phase shift, the controllable device being either a silicon controlled rectifier or a triac.

Abstract: An apparatus for starting and running a plurality of three-phase motors from a single-phase power source is described. Two of the main coils of a three-phase motor are used to run the motor as a single-phase induction motor. The third coil of a three-phase motor is used as a starting coil and is selectively powered through a switch and a capacitor. The capacitor provides the necessary difference in the phase angle of the current in the starting coil and the main coils to provide starting torque for the operation of the motor.

Abstract: A sinusoidally weighted pulse width modulated switching signal may be developed, for operating an inverter to apply sinusoidal voltage to a single phase a-c induction motor, by comparing a triangular voltage waveform of fixed frequency with a variable frequency sine wave voltage, the switching signal varying between its high and low states whenever the triangular waveform and modulating sine wave intercept one another. A constant ratio of the amplitude of the sinusoidal motor voltage relative to the voltage's frequency, and thus motor speed, may be obtained simply by translating the sinusoidal modulating waveform through a high pass filter before it is compared with the triangular wave. By setting the filter cut-off frequency above the operating frequency range (preferably from about 12 to 60 hertz) of the sine wave generator, the sine wave voltage will be attenuated by the filter in an amount inversely proportional to the sine wave frequency.

Abstract: A three-phase A.C. motor having three stator windings with stator winding power input terminals T1, T2 and T3, is energized from a single-phase A.C. line through a static phase conversion circuit that connects terminals T1 and T2 directly to the single phase line and that includes a main dephasing capacitor connected between terminals T1 and T2; a phase correction capacitor is connected in parallel with a stator winding that is not connected to terminal T3 for materially improved full load performance.

Abstract: A control arrangement for a reversible alternating current split phase induction motor of the type having a start winding electrically connected in parallel with a run winding, which controls the duty cycle of current in the start winding to selectively initiate rotation of the motor in the desired direction.In one form of the invention, a thyristor switching device is connected in series with the start winding to phase control the start winding current. An electronic controller triggers the thyristor into conduction at a first firing angle to initiate motor rotation in one direction and at a second firing angle to initiate motor rotation in the other direction. The first firing angle is less than 45.degree. and preferably in the range of 25.degree.-45.degree. relative to the supply voltage signal and the second firing angle is preferably in the range of 90.degree.-135.degree. relative to the supply voltage signal.

Abstract: A brushless d-c motor having an electric commutation circuit in which the motor and circuit are inter-connected by a mating connector is disclosed. The mating parts of the connector may be connected in two configurations. In one configuration, the motor rotates in one direction and in the other configuration, the motor rotates in the opposite direction. The mating connector is disclosed as a plug connector having a plug and a mating jack in which the connection of the motor and circuit to the pin connectors of the plug and to the jack connectors of the jack, and the arrangement of the pin connectors and jack connectors is such that the motor rotates in opposite directions in the two configurations.

Abstract: A control circuit of a two-phase AC electric motor wherein the windings and two series capacitors are delta-connected, the winding mid point is brought to one terminal of the power source, and the winding leads connected to the capacitors are brought to the other terminal of the power source through switchgear components.The control circuit is distinguished from the prior-art control circuits in that the mid point of the capacitors is connected to the mid point of the switchgear elements, with the capacitance of each capacitor being equal to the rated phase-shifting capacitance of the electric motor.

Abstract: By closing a series-connected first solid state switch, such as a triac, AC line voltage is applied directly to the first of two field windings of a two-phase reversible AC induction motor to drive the motor in one of its two directions. The shifted phase voltage, appearing at the other or second field winding, has a magnitude of about twice that of the line voltage and is employed to supply gate current to the first solid state switch over a cross-coupling circuit. Conversely, when motor rotation in the opposite direction is desired a second solid state switch or triac is rendered to conductive to apply the AC line voltage directly to the second field winding, the gate current for the second solid state switch being derived from the high magnitude shifted voltage appearing at the first winding. Since the gating voltage is phase displaced (by approximately 90.degree.

Abstract: An electric motor arrangement in which a modified induction motor is operated as a three-phase motor by connecting one of the input phases to the junction of the two motor windings, and by connecting the other two input phases to the other sides of the two motor windings. In one embodiment of the invention, one of the input phases is connected to the junction of the windings through a centrifugal switch. The induction motor may be a modified version of a permanent-split-capacitor type wherein the motor capacitor, conventionally connected across the free ends of the windings, is removed.