This section provides an overview for small ac motors as well as their applications and principles. Also, please take a look at the list of 5 small ac motor manufacturers and their company rankings.
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A small AC motor is a motor that is widely used in products and equipment that are driven by electricity. When connected to a commercial power source, they continue to rotate at a constant speed. Among small AC motors, various types are available, including speed control motors and servo motors that can output accurate rotation and torque, and reversible motors that can also rotate in reverse. There are also motors that use a 3-phase power supply and drive with high torque and high RPM.
Small AC motors are used in many products that are driven by electricity. They are used in a wide variety of products, including home appliances, equipment, robots, and conveyors. When selecting small AC motors, the following factors must be considered: speed, torque, life, power, size, output accuracy of speed and torque, and response time. Since most small AC motors are built into the interior of a product, the connection method, wiring, etc., should be confirmed using CAD or other means before purchasing.
The principle of operation of small AC motors is explained below. Small AC motors consist of a rotating shaft, a permanent magnet connected to the rotating shaft, bearings to support the shaft, and coils installed to surround the magnet. In speed control motors, a speed controller is built in to control the rotational speed. Servo motors have a built-in controller and a rotary encoder for precise rotation.
During operation, the magnetic field generated by the coil utilizes the attraction and repulsion forces received by the permanent magnet. The magnetic field generated by the coil is varied by applying an appropriate current to the coil so that the force is applied from the coil in the direction in which the magnet rotates. Features of this method are that the AC current is supplied at a constant magnitude and frequency, so that a constant rotation speed and torque can be obtained at all times. When used with a single-phase power supply, an inverter can be installed to operate the motor by shifting the phase of the frequency. Due to the Structure of the motor, there is a possibility that some positions may not rotate even if current is applied, so the stopping position is devised in such a way that the motor will not rotate.
Induction motors are also called asynchronous motors. Synchronous motors are motors whose rotational speed is equal to the synchronous speed, whereas induction motors, which are asynchronous, feature a rotational speed that is slightly slower than the synchronous speed.
Induction motors generally consist of a rotor and a cage-shaped conductor. When an electric current flows through the winding wound around the cage-shaped conductor, a rotating magnetic field is generated around the winding. Turning the magnetic field generates an induced current, and from Fleming's law, a force is generated by the action of the current and the magnetic field. The generated force causes the rotor to rotate.
An AC speed controller is used to control the speed of an AC motor, which is an induction motor or a reversible motor with a rate generator for speed detection. The actual rotation speed is compared with the commanded rotation speed, and feedback control is performed based on the comparison results to control the rotation speed.
Another method of changing the speed of an AC motor is to use an inverter. The difference between this method and the inverter method is that the inverter circuit, which controls the motor speed by changing the power supply frequency, is an open-loop control. In contrast, the method using an AC speed controller provides closed-loop control by feeding back the motor speed. Features of this method are that the motor speed information is used for control, and the rotational speed is stable.
Receivable motor is a motor that has a friction brake mechanism inside the motor. The brake mechanism is installed to improve reversibility characteristics by adding a frictional load, making this motor suitable for frequent forward and reverse operation in a short period. A rate generator is a sensor installed at the rear of the motor to detect speed.
*Including some distributors, etc.
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Ranking as of March 2023 GloballyDerivation Method
|1||Taibang Motor Industry Group Co., Ltd||100%|
Derivation MethodThe ranking is calculated based on the click share within the small ac motor page as of March 2023. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.
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