Alimak Hek motor Germany Alimak Hek model Alimak Hek price

Alimak Hek 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. Single-phase series-wound motors are widely used. Their advantages include high speed, high starting torque, compact size, light weight, resistance to stalling, and a wide applicable voltage range. Speed control can be achieved simply and easily by voltage adjustment.

Alimak Hek motor speed control

Pole-changing speed control adjusts the number of stator pole pairs in squirrel-cage motors by changing the stator winding connections to achieve speed regulation. Variable frequency drive (VFD) speed control changes the frequency of the stator power supply, thereby altering the synchronous speed. The main equipment in a VFD system is the inverter that provides variable-frequency power. Inverters fall into two categories: AC-DC-AC inverters and AC-AC inverters; AC-DC-AC inverters are predominantly used domestically. Cascade speed control introduces an adjustable additional electromotive force into the rotor circuit of a wound-rotor motor to change the slip and achieve speed regulation. Most of the slip power is absorbed by the added EMF and then returned to the grid or converted for reuse via auxiliary equipment. Depending on how slip power is absorbed and utilized, cascade speed control can be classified as motor cascade, mechanical cascade, or thyristor cascade speed control, with thyristor cascade being the most common. Adding external resistance to the rotor circuit of a wound-rotor asynchronous motor increases slip, causing the motor to run at lower speeds. The greater the inserted resistance, the lower the motor speed. This method features simple equipment and convenient control, but slip power is dissipated as heat in the resistors. It provides stepped speed control with relatively soft mechanical characteristics. Changing the stator voltage yields different mechanical characteristic curves and thus different speeds. Since motor torque is proportional to the square of the voltage, maximum torque drops significantly, resulting in a narrow speed control range, which limits applicability for standard squirrel-cage motors. To broaden the speed control range, voltage-adjustment speed control should employ squirrel-cage motors with high rotor resistance, such as torque motors designed specifically for voltage-adjustment speed control, or connect frequency-sensitive resistors in series with wound-rotor motors. To expand the stable operating range, feedback control should be used for automatic speed regulation when speed control exceeds 2:1. The primary device for voltage-adjustment speed control is a power supply capable of varying voltage. Common voltage-adjustment methods include series saturable reactors, autotransformers, and thyristor voltage control, with thyristor voltage control being optimal.

Alimak Hek motor control principles

When the motor rotates, the controller compares the speed derived from hall-sensor signal changes with the command composed of the speed and acceleration/deceleration rates set by the driver (or computed by software) to determine which next set of switches (AH, BL or AH, CL or BH, CL or ...) conducts and for how long. If the speed is insufficient, the conduction time is lengthened; if the speed is excessive, it is shortened. This function is performed by PWM. PWM determines whether the motor speed increases or decreases; generating this PWM correctly is central to achieving precise speed control. For high-speed control, the system's CLOCK resolution must be sufficient to handle software instruction timing. Additionally, the data access method for hall-sensor signal changes affects processor performance, accuracy, and real-time response. For low-speed control, especially during low-speed startup, hall-sensor signal changes become slower, making signal acquisition methods, processing timing, and appropriate configuration of control parameters based on motor characteristics critically important. Alternatively, speed feedback may reference encoder changes to increase signal resolution for better control. Smooth motor operation and good response also depend on proper P.I.D control. As previously noted, brushless DC motors use closed-loop control; therefore, the feedback signal indicates the difference between the actual motor speed and the target speed, which constitutes the error.

Alimak Hek motor operating principle

The motor's electromagnetic switch mainly consists of an electromagnet mechanism and a motor switch. The electromagnet mechanism comprises a fixed core, a movable core, an pull-in coil, and a holding coil. The fixed core remains stationary, while the movable core can move axially within a copper sleeve. A push rod is fixed to the front end of the movable core, with a switch contact disc mounted on the front end of the push rod. The rear section of the movable core connects to a shift fork via an adjustment screw and a connecting pin. A return spring installed outside the copper sleeve resets the movable core and other movable components. When the magnetic flux generated by the pull-in coil and the holding coil has the same direction, their electromagnetic forces superimpose, pulling the movable core forward until the contact disc at the front of the push rod closes the electric switch contacts, thereby energizing the motor's main circuit. When the magnetic flux directions are opposite, the electromagnetic forces cancel each other out, and the return spring automatically resets the movable core and other movable components, disconnecting the contact disc from the contacts and breaking the motor's main circuit.

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