MINIMOTOR motor Germany MINIMOTOR model MINIMOTOR price

MINIMOTOR motor refers to a low-power single-phase asynchronous motor powered by a single-phase AC power supply (AC220V). This type of motor typically has two-phase windings on the stator, and the rotor is of the ordinary squirrel-cage type. Different distributions of the two-phase windings on the stator and different power supply conditions can produce different starting and operating characteristics.

MINIMOTOR motor advantages

The motor operates in a self-controlled manner, so it does not require an additional starting winding on the rotor like a synchronous motor starting under heavy load with variable frequency speed control, nor does it oscillate or lose step when the load changes suddenly. The permanent magnets in small and medium-capacity brushless DC motors mostly use rare-earth neodymium-iron-boron (Nd-Fe-B) materials with high magnetic energy product. Therefore, the volume of rare-earth permanent magnet brushless motors is reduced by one frame size compared to three-phase asynchronous motors of the same capacity. Over the past thirty years, research on variable frequency speed control for asynchronous motors has ultimately been seeking methods to control asynchronous motor torque. Rare-earth permanent magnet brushless DC motors will surely show advantages in the field of speed control due to their wide speed regulation, small volume, high efficiency, and small steady-state speed error. Because brushless DC motors have the characteristics of DC brushed motors and are also devices with changing frequency, they are also known as DC variable frequency, with the internationally common term being BLDC. The operating efficiency, low-speed torque, and speed accuracy of brushless DC motors are better than inverters using any control technology, so they deserve industry attention. Products have been produced exceeding 55kW, and can be designed up to 400kW, meeting the needs of the industry for energy saving and high-performance drive.

MINIMOTOR motor mechanical characteristics

High motor efficiency: After embedding permanent magnet materials in the rotor, the rotor and stator magnetic fields run synchronously during normal operation. There is no induced current in the rotor winding, no rotor resistance and hysteresis loss, which improves motor efficiency. 2. High power factor: PMSM has no induced current excitation in the rotor, the stator winding presents a resistive load, the motor's power factor is close to 1, reducing stator current and improving motor efficiency. At the same time, the increase in power factor improves the grid quality factor, reduces losses in transmission and distribution lines, allows for lower transmission and distribution capacity, and saves on grid investment. 3. High starting torque: In equipment requiring high starting torque (such as oilfield pumping motors), smaller capacity permanent magnet motors can replace larger capacity Y series motors. If 37kW permanent magnet synchronous motors replace 45kW ～ 55kW Y series motors, the phenomenon of "big horse pulling small cart" is better solved, saving equipment investment costs and improving system operating efficiency. 4. Good power performance indicators: Y series motors working at 60% load see efficiency drop by 15%, power factor drop by 30%, and power performance indicators drop by 40%; while PMSM efficiency and power factor drop very little, when the motor is only at 20% load, its power performance indicators remain above 80% of full load. 5. Low temperature rise: There is no resistance loss in the rotor winding, and almost no reactive current in the stator winding, resulting in low motor temperature rise. 6. Small volume, light weight, less material consumption: For the same capacity, the volume, weight, and materials used in permanent magnet synchronous motors can be reduced by about 30%. 7. Allows for large air gaps, facilitating the construction of new magnetic circuits. 8. Small armature reaction, strong overload resistance.

MINIMOTOR motor fault handling

Motor winding open circuit: Due to poor welding or the use of corrosive flux that was not cleaned after welding, cold solder joints or loosening may occur. Mechanical stress or collision can cause coil short circuits; short circuits and ground faults can also burn out wires. When one or several wires are shorted among several wires burned together, the other wires heat up due to increased current, causing the winding to overheat and open. Generally divided into one-phase winding end break, inter-turn short circuit, parallel branch open circuit, one wire break among multiple parallel burned wires, and rotor cage break. 1. Fault phenomena: The motor cannot start, three-phase current is unbalanced, there is abnormal noise or excessive vibration, temperature rise exceeds allowable limits, or smoke appears. 2. Causes: (1) Broken during inspection and maintenance or manufacturing quality issues. (2) Poor welding of winding components, pole (phase) groups, and connections between windings and lead wires, leading to desoldering due to long-term overheating. (3) Winding damage or breaking due to mechanical force and electromagnetic field force. (4) Severe burning or fusing of windings caused by inter-turn or phase-to-phase short circuits and grounding. 3. Inspection methods: (1) Visual inspection. Breakpoints mostly occur at the winding ends; check for bends, breaks, or desoldered joints. (2) Multimeter method. Using the resistance range, for "Y" connection, connect one probe to the center point of the "Y" shape and the other probe sequentially to the heads of the three-phase windings; the phase with infinite resistance is the breakpoint. For "△" connection, disconnect the links and measure each winding group separately; infinite resistance indicates the breakpoint. (3) Test lamp method. Same method as above; the phase that does not light up is the open circuit. (4) Megohmmeter method. The phase with resistance tending towards infinity (i.e., not zero) is the breakpoint. (5) Ammeter method. When the motor is running, measure the three-phase current with an ammeter. If the three-phase current is unbalanced and there is no short circuit, the phase with lower current has a partial open/short circuit fault. (6) Bridge method. When the resistance of one phase of the motor is greater than the other two phases, it indicates a partial open circuit fault in that phase winding; (7) Current balance method. For "Y" connection, connect the three-phase windings in parallel and apply low-voltage, high-current AC power. If the current difference among the three-phase windings is greater than 10%, the end with lower current is the open circuit. For "△" connection, first disconnect one connection point of the stator winding, then apply low-voltage, high-current to each phase sequentially; the phase with lower current is the open circuit. (8) Cage detector inspection method. During inspection, if the rotor cage is broken, the millivolt meter reading should decrease. 4. Open circuit treatment methods: (1) If the open circuit is at the end, connect well, solder firmly, wrap with insulating material, sleeve with insulating tube, bind well, and then dry. (2) Windings severely burned due to inter-turn, phase-to-phase short circuits, and grounding should generally be replaced with new windings. (3) For open circuit points inside the slots, perform emergency treatment for a small number of breakpoints. Use the group elimination method to find the breakpoint, connect it at the winding break, and use after ensuring insulation qualification. (4) For cage rotor breaks, repair methods such as welding, cold joining, or bar replacement can be used.

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