SV892 892MR motor Germany SV892 892MR model SV892 892MR price

SV892 892MR motors are permanent magnet motors commutated or controlled by electronic circuits. Permanent magnet brushless motors come in two types: sine wave drive and square wave drive. Those with rectangular wave drive current are commonly called permanent magnet brushless DC motors, while those with sine wave drive current are commonly called permanent magnet AC servo motors. Based on sensor type, they can be classified into sensored motors and sensorless motors.

SV892 892MR motor starting methods

Motor starting methods include direct-on-line starting and reduced-voltage starting. Reduced-voltage starting includes: autotransformer compensated starting, star-delta switching starting, and extended-delta starting. Generally, small and medium-sized squirrel-cage asynchronous motors can be started directly; direct-on-line starting equipment is simple and the method is straightforward. However, the starting current is high and the starting torque is low. Large-capacity squirrel-cage asynchronous motors generally adopt the method of reducing the terminal voltage of the stator winding for starting. During reduced-voltage starting, the starting current can be reduced, but the starting torque is also inevitably reduced. The various reduced-voltage starting methods are introduced as follows: Autotransformer compensated starting: Starting voltage = voltage reduction factor × rated voltage; Starting current = voltage reduction factor × starting current (direct); Starting torque = square of the voltage reduction factor × starting torque (direct). Characteristics of the starting method: The motor stator winding is started with voltage reduction via an autotransformer, and the autotransformer is disconnected after starting. Advantages and disadvantages: 1 Low starting current, 2 The starting control equipment cannot handle frequent starts, 3 The equipment is relatively expensive, but the starting torque is greater than that of the star-delta switching method, so it is widely used. Star-delta switching starting: Starting voltage = 0.577 × rated voltage; Starting current = 1/3 × starting current (direct); Starting torque = 1/3 × starting torque (direct). Characteristics of the starting method: The motor stator winding is connected in star configuration during starting, and switched to delta configuration after starting. Advantages and disadvantages: 1 Low starting current, 2 Low starting torque, 3 Frequent starting is possible, 4 Low cost, suitable for motors with delta-connected stator windings, generally used for light-load starting of small-capacity motors. Extended-delta starting: Starting voltage = 0.78 × rated voltage (depends on the stator winding tap voltage); Starting current = 0.6 × starting current (direct); Starting torque = 0.6 × starting torque (direct). Characteristics of the starting method: The motor stator winding is connected in an extended-delta configuration during starting, and switched to delta configuration after starting. Advantages and disadvantages: 1 Relatively low starting current, 2 Relatively high starting torque, 3 Frequent starting is possible, 4 Only applicable to motors with intermediate taps on the stator winding. Secondly, soft starters and variable frequency drives are already widely used. For small-capacity equipment, they are still promotable due to ease of use and control. For large-capacity, high-voltage motors, they should be used with caution. Although the technology in this area is mature, the presence of nonlinear components in the circuit will generate a large amount of harmonic content, polluting the power supply. Despite the availability of harmonic mitigation equipment, highly irregular waveforms still exist in low-voltage circuits, affecting the normal operation of office electronic equipment and potentially causing breakdown of capacitors in the circuit.

SV892 892MR motor control methods

Motor vector control technology: Vector control technology emerged in the early 70 s. The vector control system for permanent magnet synchronous motors references the control strategy of DC motors. It uses coordinate transformation to decompose collected vectors such as the motor's three-phase stator currents and flux linkages into two components along the direction of the rotor flux linkage, which is a rotating vector. One component is along the rotor flux linkage direction, called the direct-axis excitation current; the other is orthogonal to the rotor flux linkage direction, called the quadrature-axis torque current. By adjusting the excitation current and torque current according to different control objectives, precise control of speed and torque is achieved, enabling the control system to obtain good steady-state and dynamic response characteristics. Depending on the control objectives, vector control algorithms for permanent magnet synchronous motors can be divided into the following types: id=0 control, maximum torque per ampere control, field-weakening control, etc. These performance indicators can all be achieved through independent control of the direct-axis excitation current and the quadrature-axis torque current.

SV892 892MR motor fault handling

Motor winding open circuits: Poor welding or the use of corrosive fluxes that are not cleaned after welding can cause cold solder joints or loosening. Mechanical stress or collision can cause coil short circuits; short circuits and ground faults can also burn out wires. When one or several wires among parallel burned wires short circuit, the remaining wires experience increased current and rising temperature, causing the winding to overheat and result in an open circuit. Generally, these are classified as open circuits at the end of one phase winding, inter-turn short circuits, open circuits at parallel branch points, open circuits in one of several parallel burned wires, and rotor cage breaks. 1. Fault symptoms: The motor cannot start, three-phase current is unbalanced, there is abnormal noise or excessive vibration, temperature rise exceeds allowable limits, or smoke is emitted. 2. Causes: (1) Wires 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 breakage caused by mechanical forces and electromagnetic field forces. (4) Severe burning or fusing of windings caused by inter-turn or inter-phase short circuits and ground faults. 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" connected motors, connect one probe to the center point of the "Y" shape and the other probe sequentially to the start ends of the three-phase windings; the phase showing infinite resistance is the breakpoint. For "△" connected motors, disconnect the links and measure each winding group separately; infinite resistance indicates the breakpoint. (3) Test lamp method. Similar to the above; the phase where the lamp does not light is the open circuit. (4) Megohmmeter method. The phase with resistance tending towards infinity (i.e., not zero) is the breakpoint. (5) Ammeter method. While the motor is running, measure the three-phase currents with an ammeter. If the three-phase currents are unbalanced and there is no short circuit phenomenon, the phase with lower current has a partial open circuit fault. (6) Bridge method. If the resistance of one motor phase is higher than that of the other two phases, it indicates a partial open circuit fault in that phase winding. (7) Current balance method. For "Y" connected motors, 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 "△" connected motors, first disconnect one connection point of the stator winding, then apply low-voltage, high-current power to each phase sequentially; the phase with lower current is the open circuit. (8) Rotor cage tester 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, reconnect and solder securely, wrap with insulating material, sleeve with insulating tubing, bind securely, and then dry. (2) Windings severely burned due to inter-turn, inter-phase short circuits, and ground faults should generally be replaced with new windings. (3) For breakpoints inside the slots, perform emergency treatment for a small number of breakpoints. Use the group elimination method to locate the breakpoint, reconnect it at the break, and use only after passing insulation tests. (4) For cage rotor breaks, repair using welding, cold joining, or bar replacement methods.

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