Alternating current motor with iron core mixed with insulating thermomagnetic alloy sheet and generator

Abstract

The invention discloses an alternating current motor with an iron core mixed with an insulating thermomagnetic alloy sheet and a generator. A stator iron core of the rare earth permanent magnet synchronous axial magnetic flux motor is formed by alternately overlapping a circle of insulation multi-orientation silicon steel sheets and a circle of insulation thermomagnetic alloy sheets. A stator iron core of the rare earth permanent magnet radioactive ray direction magnetic flux motor is formed by alternately overlapping a layer of insulation multi-orientation silicon steel sheet and a layer of insulation thermomagnetic alloy sheet. A stator core of the squirrel-cage rotor motor is formed by alternately overlapping three layers of insulation multi-orientation silicon steel sheets and one layer of insulation thermomagnetic alloy sheets. A stator iron core and a rotor iron core of the wound rotor motor are formed by alternately overlapping three layers of insulation multi-orientation silicon steel sheets and one layer of insulation thermomagnetic alloy sheets. A stator iron core of the generator is formed by alternately overlapping three layers of insulation multi-orientation silicon steel sheets and one layer of insulation thermomagnetic alloy sheets. Under the load of 50%, the insulating thermomagnetic alloy sheet is a non-magnetic material. Under 100% load, the insulating thermomagnetic alloy sheet is changed into a magnetic substance, and heat energy is converted into magnetic energy.

Description

Technical fields:

[0001] This invention relates to an AC motor and generator with insulating thermomagnetic alloy sheets mixed in the iron core.

[0002] Back technique:

[0003] Patent No. ZL201110377552.0, "Automotive Waste Heat Power Generation Device," Background Technology: Sourced from Yeeyan.com, "A New Alloy Can Directly Convert Heat Energy into Electrical Energy." A novel non-magnetic alloy material, when its underlying copper plate is slightly heated, suddenly becomes strongly magnetic. Researchers at the University of Minnesota have discovered that a new alloy with unique properties can directly convert heat energy into electrical energy. This alloy is composed of iron, nickel, cobalt, manganese, and tin, and depending on the temperature, it can exhibit either non-magnetic or strongly magnetic properties. According to a press release from the University of Minnesota, under certain conditions, the new alloy—Ni45Co5Mn40Sn10—undergoes a reversible phase transition: that is, when the temperature changes, one type of solid transforms into another type of solid. Specifically, the new alloy changes from non-magnetic to strongly magnetic; in this process, only a slight increase in temperature is needed. When the heated new alloy is placed near a permanent magnet—such as a rare-earth magnet—the magnetic force of the new alloy suddenly and dramatically increases. Current is generated in the surrounding coils. Researchers say that a process called hysteresis causes heat loss, but this new alloy has low hysteresis. Because of this, it can convert a large amount of waste heat into electrical energy. This material is clearly applicable to automobile exhaust pipes. Some automakers have already begun developing heat exchangers that can convert vehicle exhaust into usable electrical energy; one automaker is using an alloy called cobaltite, which is a mixture of rare-earth-doped cobalt and arsenic materials. The stator core of the automotive waste heat power generation device is made of stacked insulating sheets of the new alloy, and the stator core slots contain excitation coils and generating coils.

[0004] Electric bicycles use 300W-400W permanent magnet synchronous disc motors, which are relatively lightweight. A patent has been applied for on permanent magnet synchronous hub motors for automobiles, but a 50W permanent magnet synchronous hub motor for automobiles weighs over 10 kg. Adding the rubber tires and steel axle, the weight of a car wheel exceeds 20 kg, so permanent magnet synchronous hub motors are not used in automobiles. Axial flux motors are divided into single-rotor coreless axial flux motors, double-rotor coreless axial flux motors, single-rotor cored axial flux motors, and double-rotor cored double-coil axial flux motors. Cored axial flux motors are heavier and have higher output power. For the same weight, a cored axial flux motor has a much higher output power than a permanent magnet synchronous motor. Axial flux motors can achieve a maximum output of 51 kW per kilogram, while permanent magnet synchronous motors can only achieve 10 kW per kilogram.

[0005] On highways, rare-earth permanent magnet axial flux synchronous motors operate at very high speeds. The back electromotive force (EMF) of these motors is very high, requiring increased voltage for variable frequency speed control, but electric vehicles only reach a maximum of 400 volts. To reduce the back EMF, electronic methods are needed to demagnetize the permanent magnets, followed by electronic remagnetization after exiting the highway. One proposed method uses a hydraulic rubber bladder to move the coil and adjust the distance between the coil and the permanent magnet, reducing magnetic leakage, increasing flux, and raising the EMF to accommodate high-speed driving. However, the temperature of the axial flux motor is extremely high at high speeds on highways, requiring water cooling, and the efficiency of rare-earth permanent magnet axial flux motors is very low. There are also issues with rare-earth permanent magnet radial flux motors. One proposed method uses mechanical force to move a slider, raising the rare-earth permanent magnet at low speeds and lowering it at high speeds to reduce the back EMF.

[0006] The lowest insulation class temperature for electric motors and generators is below 70°C, and the highest insulation class temperature for electric motors and generators is below 130°C. Summary of the Invention:

[0007] An AC motor with insulating thermomagnetic alloy sheets mixed in its core is disclosed. The stator core of this rare-earth permanent magnet synchronous axial flux motor is composed of alternating layers of insulating multi-oriented silicon steel sheets and insulating thermomagnetic alloy sheets. In an electric vehicle equipped with this rare-earth permanent magnet synchronous axial flux motor, traveling at 50 km / h on urban roads, the stator core temperature is below 70°C. The insulating thermomagnetic alloy sheets in the stator core are non-magnetic, resulting in a low magnetic field strength at the stator poles. On a highway, at 110 km / h, the stator core temperature exceeds 70°C. The non-magnetic insulating thermomagnetic alloy sheets in the stator core transform into magnetic materials, increasing the magnetic field strength at the stator poles. During stator hysteresis, the insulating thermomagnetic alloy sheets convert heat energy into magnetic energy, cooling the stator core and keeping its temperature below 100°C, thus increasing the magnetic field strength at the stator poles.

[0008] An AC motor and generator with insulating thermomagnetic alloy sheets mixed in the iron core are disclosed. The stator core of the rare-earth permanent magnet radial flux motor is composed of alternating layers of insulating multi-oriented silicon steel sheets and insulating thermomagnetic alloy sheets. In an electric vehicle equipped with the rare-earth permanent magnet radial flux motor traveling at 50 km / h on urban roads, the stator core temperature is below 70°C, and the insulating thermomagnetic alloy sheets in the stator core are non-magnetic, resulting in a low magnetic field strength at the stator poles. On a highway traveling at 110 km / h, the stator core temperature exceeds 70°C. The non-magnetic insulating thermomagnetic alloy sheets in the stator core transform into magnetic materials, increasing the magnetic field strength at the stator poles. During stator core hysteresis, the insulating thermomagnetic alloy sheets convert heat energy into magnetic energy, cooling the stator core and keeping its temperature below 100°C, thus increasing the magnetic field strength at the stator poles.

[0009] An AC motor with insulating thermomagnetic alloy sheets mixed in its core is disclosed. The stator core of the squirrel-cage rotor motor is composed of three layers of insulating multi-oriented silicon steel sheets and one layer of insulating thermomagnetic alloy sheets, which are alternately stacked. When the load of the squirrel-cage rotor motor is below 50% of its rated power, the temperature of the stator core is below 70°C, and the insulating thermomagnetic alloy sheets in the stator core are non-magnetic materials, resulting in a low magnetic field strength at the stator poles. When the squirrel-cage rotor motor is operating at 100% of its rated power, the temperature of the stator core exceeds 70°C. The non-magnetic materials in the insulating thermomagnetic alloy sheets in the stator core transform into magnetic materials, increasing the magnetic field strength at the stator poles. During the hysteresis process of the stator core, the insulating thermomagnetic alloy sheets convert heat energy into magnetic energy, cooling the stator core and keeping its temperature below 100°C, thus increasing the magnetic field strength at the stator poles.

[0010] An AC motor with insulating thermomagnetic alloy sheets mixed in its core is disclosed. The stator and rotor cores of the wound-rotor motor are composed of three layers of insulating multi-oriented silicon steel sheets and one layer of insulating thermomagnetic alloy sheets, alternately stacked. When the load of the wound-rotor motor is below 50% of its rated power, the temperature of the stator core, rotor, and rotor pole cores is below 70°C. The insulating thermomagnetic alloy sheets in the stator and rotor cores are non-magnetic materials, and the magnetic field strength of the stator and rotor poles is low. When a wound-rotor motor operates at 100% rated power, the temperature of the stator core and rotor core exceeds 70°C. The non-magnetic material in the insulating thermomagnetic alloy sheets of the stator and rotor cores transforms into magnetic material, increasing the magnetic field strength of the stator and rotor poles. During the hysteresis process of the stator and rotor cores, the insulating thermomagnetic alloy sheets convert heat energy into magnetic energy, cooling the stator and rotor cores and keeping their temperature below 100°C, thus increasing the magnetic field strength of the stator and rotor poles.

[0011] A generator with insulating thermomagnetic alloy sheets mixed in its core is disclosed. The generator's stator core is composed of three layers of insulating multi-oriented silicon steel sheets and one layer of insulating thermomagnetic alloy sheets, which are alternately stacked. When the generator operates at a load below 50% of its rated power, the temperature of the stator core is below 70°C, and the insulating thermomagnetic alloy sheets in the stator core are non-magnetic, resulting in a low magnetic field strength at the stator poles. When the generator operates at 100% of its rated power, the temperature of the stator core exceeds 70°C. The non-magnetic materials in the insulating thermomagnetic alloy sheets in the stator core transform into magnetic materials, increasing the magnetic field strength at the stator poles. During the stator core hysteresis process, the insulating thermomagnetic alloy sheets convert thermal energy into magnetic energy, cooling the stator core and keeping its temperature below 100°C, thus increasing the magnetic field strength at the stator poles.

Claims

1. An AC motor with an insulating thermomagnetic alloy sheet mixed in its core, characterized in that: The stator core of the rare earth permanent magnet synchronous axial flux motor is composed of alternating layers of insulated multi-oriented silicon steel sheets and insulated thermomagnetic alloy sheets.

2. An AC motor and generator with an insulating thermomagnetic alloy sheet mixed in the iron core, characterized in that: The stator core of the rare-earth permanent magnet radial flux motor is made of alternating layers of insulating multi-oriented silicon steel sheets and insulating thermomagnetic alloy sheets.

3. An AC motor with an insulating thermomagnetic alloy sheet mixed in its core, characterized in that: The stator core of a squirrel-cage rotor motor is made of three layers of insulated multi-oriented silicon steel sheets and one layer of insulated thermomagnetic alloy sheets, which are alternately stacked.

4. An AC motor with insulating thermomagnetic alloy sheets mixed in its iron core, characterized in that: The stator core and rotor core of a wound-rotor motor are made of three layers of insulated multi-oriented silicon steel sheets and one layer of insulated thermomagnetic alloy sheets, which are alternately stacked.

5. A generator with an insulating thermomagnetic alloy sheet mixed in its iron core, characterized in that: The stator core of the generator is made of three layers of insulated multi-oriented silicon steel sheets and one layer of insulated thermomagnetic alloy sheets, which are alternately stacked.