FELM srl motor Germany FELM srl model FELM srl price

FELM srl motor is a commonly used AC motor. The synchronous motor is the heart of the power system; it is a component that integrates rotation and stationary parts, electromagnetic changes and mechanical motion, to realize the conversion between electrical energy and mechanical energy. Its dynamic performance is very complex, and its dynamic performance has a great impact on the dynamic performance of the entire power system. The characteristic is: during steady-state operation, there is an invariant relationship between the rotor speed and the grid frequency: n=ns=60f/p, where f is the grid frequency, p is the number of pole pairs of the motor, and ns is called the synchronous speed. If the grid frequency remains constant, the speed of the synchronous motor is always constant in steady state and independent of the load magnitude. Synchronous motors are divided into synchronous generators and synchronous motors. AC machines in modern power plants are mainly synchronous generators.

FELM srl motor maintenance

Preparation and inspection before motor start-up: Check whether the grounding of the electric motor and starting equipment is reliable and complete, and whether the wiring is correct and in good condition. Check whether the voltage and frequency shown on the motor nameplate match the power supply voltage and frequency. For newly installed or long-idle motors, check the phase-to-phase and phase-to-ground insulation resistance of the windings before start-up. The insulation resistance should be greater than 0.5 MΩ; if it is lower than this value, the windings must be dried. For wound-rotor types, check whether the brush device on the collector ring works properly and whether the brush pressure meets the requirements. Check whether the motor rotates flexibly and whether the oil in the sliding bearing has reached the specified oil level. Check whether the rated current of the fuse used for the motor meets the requirements. Check whether all fastening bolts and installation bolts of the motor are tightened. After all the above checks meet the requirements, the motor can be started. After the motor starts, run it no-load for about 30 minutes, and observe carefully for any abnormalities. If abnormal conditions such as noise, vibration, or overheating are found, take measures to eliminate them before putting the motor into operation. When starting a wound-rotor motor, connect the starting rheostat to the rotor circuit. For motors with a brush lifting mechanism, lower the brushes, disconnect the short-circuiting device, close the stator circuit switch, and operate the rheostat. When the motor approaches the rated speed, lift the brushes, close the short-circuiting device, and the motor start-up is complete.

FELM srl motor performance

The output torque of the motor decreases as the speed increases, and drops sharply at higher speeds, so its maximum operating speed is generally 300～600RPM. AC servo motors provide constant torque output, meaning they can output rated torque within their rated speed (generally 2000RPM or 3000RPM), and provide constant power output above the rated speed. Four, different overload capabilities: stepper motors generally do not have overload capability. AC servo motors have strong overload capability. Five, different operating performance: the control of stepper motors is open-loop control; if the starting frequency is too high or the load is too large, step loss or stalling is likely to occur; if the speed is too high when stopping, overshoot is likely to occur. Therefore, to ensure control accuracy, acceleration and deceleration must be handled properly. AC servo drive systems are closed-loop control; the driver can directly sample the feedback signal from the motor encoder, forming internal position and speed loops, generally avoiding step loss or overshoot phenomena common in stepper motors, resulting in more reliable control performance. Six, different speed response performance: it takes 200～400 milliseconds for a stepper motor to accelerate from standstill to operating speed (generally several hundred RPM). AC servo systems have better acceleration performance; taking Sanyo 400W AC servo motor as an example, it takes only a few milliseconds to accelerate from standstill to its rated speed 3000RPM, making it suitable for control applications requiring rapid start-stop. In summary, AC servo systems are superior to stepper motors in many performance aspects. However, stepper motors are also frequently used as actuator motors in applications with lower requirements. Therefore, in the design of control systems, factors such as control requirements and cost must be comprehensively considered to select the appropriate control motor.

FELM srl motor working principle

The electromagnetic switch of the motor mainly consists of two parts: the electromagnet mechanism and the motor switch. The electromagnet mechanism is composed of a fixed core, a movable core, an attraction coil, and a holding coil. The fixed core remains stationary, while the movable core can move axially within the copper sleeve. A push rod is fixed to the front end of the movable core, with a switch contact disc installed at the front end of the push rod. The rear section of the movable core is connected to the shift fork via an adjustment screw and a connecting pin. A return spring is installed outside the copper sleeve to reset the movable components such as the movable core. When the magnetic flux generated by the energized attraction coil and holding coil has the same direction, their electromagnetic forces superimpose, pulling the movable core forward until the contact disc at the front end of the push rod connects the electric switch contacts, thereby completing the main circuit of the motor. When the magnetic flux generated by the energized attraction coil and holding coil has opposite directions, their electromagnetic forces cancel each other out. Under the action of the return spring, the movable components such as the movable core automatically reset, disconnecting the contact disc from the contacts and breaking the main circuit of the motor.

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