RGM motor Germany RGM model RGM price

RGM motors are devices that place the rotor in a rotating magnetic field, where it obtains torque under the action of the field, causing the rotor to turn. The rotor is a rotatable conductor, typically squirrel-cage in shape. Invented by electrical engineer Nikola Tesla in 1887. The rotor is a rotatable conductor, typically squirrel-cage in shape. The stator is the non-rotating part of the electric motor, with the main task of generating a rotating magnetic field. The rotating magnetic field is not achieved by mechanical means. Instead, alternating current is passed through pairs of electromagnets, causing their magnetic pole properties to change cyclically, thus equivalent to a rotating magnetic field. Unlike DC motors, these motors do not have brushes or slip rings. Depending on the type of AC power used, there are single-phase and three-phase motors; single-phase motors are used in appliances such as washing machines and electric fans, while three-phase motors serve as power equipment in factories.

RGM motor structure

A motor is an electric motor that requires only a single-phase AC power supply. A single-phase asynchronous motor consists of a stator, rotor, bearings, housing, end covers, etc. The stator consists of a frame and a core with windings. The core is made of stacked silicon steel sheets with punched slots. Inside the slots are installed two sets of main windings (also called running windings) and auxiliary windings (also called starting windings or secondary windings) spaced 90° electrical degrees apart. The main winding is connected to the AC power supply, and the auxiliary winding is connected in series with a centrifugal switch S, starting capacitor, running capacitor, etc., before being connected to the power supply. The rotor is a cage-type cast aluminum rotor, formed by stacking the core and casting aluminum into the core slots, along with end rings, shorting the rotor bars into a squirrel-cage type. Single-phase asynchronous motors are further divided into single-phase resistance-start asynchronous motors, single-phase capacitor-start asynchronous motors, single-phase capacitor-run asynchronous motors, and single-phase dual-value capacitor asynchronous motors.

RGM motor fault handling

Incorrect motor winding connections result in an incomplete rotating magnetic field, causing symptoms such as difficult starting, unbalanced three-phase current, and high noise. If not handled promptly, severe cases can burn out the windings. The main situations are as follows: one or several coils in a pole phase are inserted backwards or the head and tail are connected incorrectly; pole (phase) groups are connected in reverse; a certain phase winding is connected in reverse; parallel winding branches are connected incorrectly; incorrect "△" or "Y" connection methods. 1. Fault phenomena: the motor cannot start, no-load current is excessively large or unbalanced, temperature rises too quickly, there is severe vibration and loud noise, or fuses blow. 2. Causes: mistakenly connecting a "△" type as a "Y" type; during maintenance, the head and tail of one phase of the three-phase windings are connected in reverse; inappropriate tap position selection for reduced-voltage starting or internal wiring errors; incorrect winding connections when new motors are wound; incorrect identification of leads on old motors. 3. Inspection methods: (1) Ball bearing method. If the ball bearing rolls along the inner circumferential surface of the stator, the connection is correct; otherwise, there is a wiring error. (2) Compass method. If the windings are not connected incorrectly, the polarity indicated by the compass should be opposite when passing adjacent pole (phase) groups in one phase winding. In three-phase windings, the polarities of adjacent pole (phase) groups of different phases should also be opposite. If the polarity direction remains unchanged, it indicates that one pole (phase) group is reversed. If the direction is indefinite, there are reversed coils within the phase group. (3) Multimeter voltage method. According to the wiring diagram, if the voltmeter shows no indication in both measurements, or shows a reading in one measurement and none in the other, it indicates reversed windings. (4) Other common methods include the dry battery method, milliammeter residual magnetism method, and motor rotation direction method. 4. Handling methods: (1) If a coil or coil group is connected in reverse, the no-load current will be significantly unbalanced, and the motor should be returned to the factory for repair. (2) If the lead wires are incorrect, correctly identify the head and tail and reconnect. (3) For incorrect reduced-voltage starting connections, carefully check against the wiring or schematic diagram and rewire. (4) If wiring errors occur after winding new motors or rewinding new windings, send them to the factory for repair. (5) When one phase of the stator winding is connected in reverse, the current in that phase will be particularly high. Use this characteristic to locate the fault and perform repairs. (6) If a "Y" type is connected as a "△" type or the number of turns is insufficient, the no-load current will be high. Correct this promptly. How to use a dry battery and multimeter to identify the same ends of the six lead wires of a three-phase asynchronous motor.

RGM motor applications

The motor requires only a single-phase power supply, so it is widely used in small production and household equipment. However, due to its relatively poor economic performance indicators, it is only manufactured in low power ratings. Single-phase resistance-start asynchronous motor. Power ranges from 60 to 370W. Characteristics: No external phase-splitting components are added. It starts using the resistance of the auxiliary winding itself and uses a centrifugal switch to disconnect the auxiliary winding at the end of starting. The structure is relatively simple. It has medium starting torque and overload capacity, making it suitable for small machine tools, blowers, and medical machinery. Single-phase capacitor-start asynchronous motor. Power ranges from 120 to 750W. This is a single-phase motor that uses an external capacitor to increase starting torque. An external capacitor is connected in series with the auxiliary winding, and both the auxiliary winding and capacitor are disconnected from the power supply by a centrifugal switch at the end of starting. Like the BO2 type, it operates with only the main winding, leaving the auxiliary winding idle. Capacitor-start motors have higher starting torque but medium overload capacity. Suitable for air compressors, refrigerators, washing machines, grinders, threshers, and water pumps. Single-phase capacitor motor. This is a single-phase motor that uses one capacitor for both starting and running. The auxiliary winding, capacitor, and main winding all participate in operation. Therefore, no centrifugal switch is required. Proper design creates an ideal rotating magnetic field during operation, resulting in good motor performance, high efficiency and power factor, and low noise. Its power range is 4 to 250W. Since one capacitor serves both starting and running functions, and considering the pros and cons, because the starting time is very short, a cheaper, smaller value capacitor is selected to meet the needs of long-term operation as much as possible. Therefore, this motor has lower starting torque and can only be used in machinery that starts under no-load or light-load conditions, such as electric fans, ventilation fans, and tape recorders. Dual-value capacitor motors have higher power, and the required capacitors are much more expensive. These motors have good starting and running performance. Suitable for household appliances and small machine tools.

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