heytec motor Germany heytec model heytec price

heytec motors are named for their armature winding and field winding connected in series. Single-phase series-wound motors are AC/DC universal motors; they can operate on either AC or DC power supplies. The single-phase series motor is widely used. Its advantages include high speed, high starting torque, compact size, light weight, resistance to stalling, and a wide operating voltage range. Speed control via voltage adjustment is simple and easy to implement.

heytec motor fault analysis

Fuel system oil pressure directly affects mixture concentration, so fuel pressure should be checked first. Connect a fuel pressure gauge to the fuel line, start the engine, and measure the fuel pressure. If pressure is too high, replace the pressure regulator. If pressure is too low, pinch the return hose; if pressure rises to normal, the fuel pressure regulator is faulty; otherwise, check the fuel pump and fuel filter. After shutdown, fuel pressure should remain at the specified value 5min; otherwise, injector leakage is causing an overly rich mixture. During hard starting, the fuel pump usually works normally; issues are often due to a clogged pump screen preventing adequate fuel intake or a restricted fuel filter causing insufficient system pressure. Some models have a cold-start injector that enriches the mixture during cold starts to improve performance. The cold-start injector is controlled by the starter switch and a thermotime switch; injection duration depends on the thermotime switch heating coil current and coolant temperature. Cold-start system faults often manifest as: the cold-start injector clogged with varnish, affecting atomization and causing hard cold starts; cold-start injector failure; thermotime switch short circuit (contacts normally closed) or open circuit (normally open). If contacts are normally closed, excess fuel is injected during warm starts, causing hard hot starts. If the thermotime switch is shorted, the cold-start injector never operates, causing hard cold starts.

heytec motor fault handling

Motor winding open circuit. Poor soldering or the use of corrosive flux, if not cleaned thoroughly after soldering, can cause cold solder joints or loosening. Mechanical stress or collision can cause coil short circuits; short-to-ground faults can also burn out conductors. When one or several conductors in a parallel bundle short circuit, the remaining conductors experience a temperature rise due to increased current, causing winding overheating and open circuits. Common types include: open circuit at the end of a phase winding, inter-turn short circuit, open circuit at parallel branch connections, open circuit of one conductor in a multi-conductor parallel burnout, and rotor cage breakage.1. Fault symptoms: the motor fails to start, three-phase current is unbalanced, there is abnormal noise or excessive vibration, temperature rise exceeds the allowable limit, or smoke is emitted.2. Causes:(1) Broken during inspection and maintenance, or manufacturing quality issues.(2) Poor soldering at 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 phase-to-phase short circuits and ground faults.3. Inspection methods:(1) Visual inspection. Breakpoints mostly occur at the winding ends; check for physical damage, bending, or desoldered joints.(2) Multimeter method. Using the resistance range: for "Y" connection, connect one probe to the center point of the "Y" configuration and the other probe sequentially to the start terminals of the three-phase windings; the phase showing infinite resistance is the open circuit. For "△" connection, 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 current with an ammeter. If the three-phase current is 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" 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 exceeds 10%, the side with lower current is the open circuit. For "△" connection, 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 firmly, wrap with insulating material, sleeve with insulating tubing, bind securely, and then dry.(2) If the winding is severely burnt due to inter-turn, phase-to-phase short circuits, or grounding, generally replace with a new winding.(3) For breakpoints inside the slots, perform emergency handling for a small number of breakpoints. Use the group elimination method to locate the breakpoint, reconnect at the break, and use only after passing insulation tests.(4) For squirrel-cage rotor breakage, repair using welding, cold joining, or bar replacement methods.

heytec motor advantages

Motors can be mounted directly on the wheel axle to form an integrated direct-drive system, where each axle is a drive unit, eliminating the need for a gearbox. Advantages of permanent magnet synchronous motors: high power efficiency and high power factor; low heat generation, resulting in a simple, compact, and quiet cooling system; fully enclosed structure with no gear wear, no gear noise, and no lubrication or maintenance required; high allowable overload current and significantly improved reliability; lightweight transmission system with lower unsprung weight than traditional axle drives and higher power-to-weight ratio; absence of a gearbox allows flexible bogie design (e.g., flexible bogies, single-axle bogies), greatly improving train dynamic performance. The use of permanent magnet poles, especially rare-earth magnets (such as NdFeB), provides high magnetic energy product and high air-gap flux density, resulting in smaller size and lighter weight for the same capacity. The rotor has no copper or iron losses, nor friction losses from slip rings and brushes, ensuring high operational efficiency. Low moment of inertia allows high pulse torque and acceleration, offering good dynamic performance, compact structure, and reliable operation.

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