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JP2911337B2 |
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JPH11159467A |
To improve power efficiency by sufficiently performing preheating by as little current consumption as possible. Preheating with high power efficiency can be performed by making it possible to generate heat by hysteresis loss in addition ...
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JP2596521Y2 |
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JPH11155299A |
To vary the revolution of a two-phase induction motor freely, without the use of a capacitor and improve the drive efficiency of the motor easily. An inverter 15 which has a plurality of circuit switching means, constituted of a first sw...
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JPH11155293A |
To activate a motor even in the case of heavily loaded activation, to control speed, and to suppress an over current on activation, by changing a conduction angle within a constant period by phase control, and by controlling the torque a...
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JP2902585B2 |
PURPOSE: To adjust lowering height easily and surely by transmitting a pulse signal with the lowering of a blind and stopping the blind when the count value coincides with a preset value. CONSTITUTION: When a lowering switch 23 for a con...
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JPH11150968A |
To obtain a phase splitting capacitor permanent magnet synchronous motor which prevents a rotor from being pulled into a speed of synchronous rotation when it is brought close to the speed of synchronous rotation and which prevents a sho...
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JPH11150967A |
To provide a control method for disk drive motors which makes their sure restart possible at a small cost. Just before starting drive of a rotor 2 again in the forward rotation direction, after rotating the rotor 2 in the forward rotatio...
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JP2900280B2 |
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JPH11150966A |
To minimize a time lag, at the time of starting a motor fitted with a nonexcitation operating electromagnetic brake to be used for elevators and so forth, and to prevent the load of an elevator from falling. An apparatus 11 controls the ...
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JP2897168B2 |
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JP2898140B2 |
PURPOSE: To prevent respective transistors jointed in series between power sources, from being turned ON at the same time, in a transistor bridge circuit. CONSTITUTION: At the diagonal positions of transistors 4, 34 for feeding current t...
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JPH11146677A |
To provide a motor driving equipment having resistance to electric noise and mechanical disturbance by outputting a phase excitation signal by logic/combining a pulse modulation signal generated by a voltage instruction signal and a roto...
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JP2890868B2 |
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JPH11127587A |
To positively and extremely rapidly invert a rotational direction in a single-phase induction motor through which speed is controlled. In the case where a single-phase induction motor 1 with a speed detector 3 is operated in a forward or...
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JP2889750B2 |
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JP2889972B2 |
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JPH11113230A |
To provide a bipolar synchronous motor the output efficiency of which is further improved, by eliminating the useless attaching space of a bobbin attached to a stator core. In an outer rotor type bipolar synchronous motor which is operat...
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JPH1198869A |
To provide a fan motor device which can surely restart a fan motor without re-starting power supply when the fan motor is released from a constrained state after the fan motor is constrained. A fan motor device is provided with a short-c...
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JPH1198877A |
To make it possible to guard a load device from impact and make angular speed constant, by converting the angular position of an intermediate shaft rotating into a position signal, and further converting the position signal into a signal...
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JPH1198872A |
To economize the capital investment of a thyristor starter for a synchronous machine. Starters 1a and 1b have the same constitution and have capacities which are about the half the capacity required for starting one synchronous machine 8...
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JPH1198870A |
To provide a motor control circuit for multipole motor which can protect a semiconductor element from a rush current when starting a motor and, at the same time, can correspondingly reduce the cost of the semiconductor element in circuit...
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JPH1198889A |
To enhance speed control in a low speed region by connecting a contactor, i.e., a switching element, to the high resistance side of a secondary resistor connected with the secondary rotor of a wound-rotor motor. When a lever action corre...
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JPH1193859A |
To reduce maintenance work such as disassembling/inspection of a pump itself, and improve convenience in use by rotating it again in the steady direction after a motor is rotated in the inverse direction of the steady direction, and impa...
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JPH1189259A |
To provide an operating system which can directly actuate a synchronous motor, by making any dynamic brake circuit unnecessary. A controller 16 discriminates the actuation of a first synchronous motor 2 by means of circuits 13-15 from th...
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JPH1182064A |
To contract the setting space and reduce the equipment cost by providing a fuel cell for generating a DC power by the fuel of a gas turbine and a reverse converter for imparting the DC power generated by the fuel cell to a synchronous ge...
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JPH1175390A |
To improve a method and equipment for starting the rotation of a rotor in a multi-phase DC motor, by controlling the operation of a three-phase DC motor. A microcontroller 40 controls drive currents in coils 8, 9, 10 through a serial int...
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JP2868544B2 |
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JPH1169856A |
To enable power-saving and re-starting, and to eliminate the thermal effect, by using an induction motor on a compressor, to control the opening/ closing of a relay connected in series to a positive characteristic thermister which is con...
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JPH1169867A |
To provide a device for controlling and driving a sensorless DC brushless motor which is capable of reading the inducted voltage of the stator windings of the DC brushless motor without being affected by noise. This drive gear is provide...
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JP2860968B2 |
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JP2590637Y2 |
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JPH1141962A |
To prevent damages to a motor and improve the durability of a motor controller, by supplying a reverse drive current to an armature opening a window glass and a forward drive current for to an armature closing a window glass. When a wind...
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JP2853917B2 |
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JPH1131445A |
To provide a switch device operable with high efficiency with a motor having a good starting characteristic. A switch device has a bimetal element 14 for a first switch circuit 11, a first resistant heating element 13 connected in series...
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JPH1127970A |
To reduce the line current introduced to a motor, while the motor is being started. A starter circuit 10 is provided with a first bidirectional switch S1 , which is controlled so as to be circulated between an opened position and a close...
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JPH1123024A |
To prevent vibration and abnormal sound due to the eccentricity of a rotary body, whose posture is stabilized in accordance with the rotation of the rotary body. A motor driver 88 for an air cleaner, in which a water spraying rotary body...
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JPH118996A |
To obtain a drive method for an induction motor, in which the operation for increasing the frequency set value is temporarily interrupted if intermittent control is entered, when the induction motor is accelerated and then the operation ...
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JP2843626B2 |
A power regulation system for an AC motor includes a motor terminal box mounted solid state starter having water-cooled SCRs. The SCRs of the starter are cooled by water circulated thrugh a dedicated SCR heat exchanger. The starter mount...
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JPH114598A |
To reduce the level of higher harmonics, by reducing the capacity of a thyristor starting equipment as a whole plant series constituted with a plurality of shafts. A thyristor starting unit 4 having an insufficient capacity for one shaft...
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JPH112147A |
To normally open and close a throttle valve in a machine where an air throttle valve is rotated by a reluctance motor, by locating the air throttle valve on a rotary position where the reluctance motor can generate the maximum torque at ...
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JPH114587A |
To provide a starting method of a permanent magnet synchronous motor by which the motor can be turned in an intended direction without carrying the polarity. At the time of operation start, a pole detection command generating unit 36 swi...
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JPH10337064A |
To provide a starting method for an inverter driven motor an inverter system applying that method in which no burden is applied to neither a rectifying circuit nor an inverter at the time of starting a motor. In the starting method for a...
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JPH10337063A |
To eliminate the need for a large installation space and to achieve soft start inexpensively, by gradually increasing the ratio of ON time with respect to the sum of the ON time and OFF time from several amount of fraction up to 1 as tim...
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JPH10337065A |
To use the same synchronous motor at 50 and 60 Hz regions, by providing a stator coil where both edge parts oppose each other via a rotor, arranging a tap at the stator coil and short-circuiting the tap on starting, and opening the tap a...
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JPH10337091A |
To detect the power failure of an AC power source, within an inverter, and reopen the operation of the motor at a proper point of time at recovery from the power failure, in an inverter for motor drive where an electromagnetic contactor ...
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JP2839576B2 |
During the run-up of high-power synchronous machines (6), such as those used in pumped storage plants, in gas turbines sets and so forth, unwanted alternating currents with slip frequencies between those of the phase swings and the nomin...
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JP2834733B2 |
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JPH10323098A |
To provide an initial exciting method of a synchronous motor wherein vibration of a rotor at the time of initial magnetic pole pull-in is restrained in a short time, and gain set portions like the gain of a velocity controller are reduce...
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JP2828666B2 |
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