DANAHER motor Germany DANAHER model DANAHER price

DANAHER motors refer to motors with speeds exceeding 10000r/min. Due to their high speed, their volume is far smaller than that of ordinary motors of the same power. Connected directly to the prime mover, they eliminate traditional reduction gears. With low rotational inertia, high-speed motors offer advantages such as high power density, effective material savings, high transmission efficiency, low noise, and fast dynamic response.

DANAHER motor mechanical characteristics

The basic features of the motor are that the rotor winding does not need to be connected to other power sources, and its stator current is drawn directly from the AC power system; compared with other motors, the asynchronous motor has a simple structure, is easy to manufacture, use, and maintain, offers high operational reliability, is lightweight, and has low cost. Taking the three-phase asynchronous motor as an example, compared with a DC motor of the same power and speed, the former weighs only half as much and costs only one-third. Asynchronous motors can also easily derive various product series to meet the requirements of different environmental conditions. They also have load characteristics close to constant speed, meeting the driving requirements of most industrial and agricultural production machinery. Their limitation is that their speed has a fixed slip relative to the synchronous speed of their rotating magnetic field (see asynchronous motor), resulting in poor speed regulation performance. In applications requiring a wide and smooth speed regulation range (such as driving rolling mills, hoists, large machine tools, etc.), they are less economical and convenient than DC motors. In addition, when running, asynchronous motors draw reactive power from the power system for excitation, which leads to a deterioration of the power factor of the power system. Therefore, in high-power, low-speed applications (such as driving ball mills, compressors, etc.), it is more reasonable to use synchronous motors. Due to the large production volume and wide application of asynchronous motors, they must have a wide variety of models and specifications to match various machinery. Therefore, special attention must be paid to standardization, serialization, and generalization in the design and production of asynchronous motors. Among various product series, the three-phase asynchronous motor series, with the largest output and widest application, is the basic series; in addition, there are several derived series (series derived by making partial changes to the basic series) and specialized series (series with special structures designed for special needs).

DANAHER motor working principle

The starting and operation of the motor are formed by the interaction of the magnetic fields generated by the stator winding, the rotor squirrel-cage winding, and the permanent magnets. When the motor is stationary, a three-phase symmetrical current is supplied to the stator winding, generating a stator rotating magnetic field. The stator rotating magnetic field rotates relative to the rotor, inducing current in the squirrel-cage winding and forming a rotor rotating magnetic field. The asynchronous torque generated by the interaction between the stator rotating magnetic field and the rotor rotating magnetic field accelerates the rotor from standstill. During this process, the rotor permanent magnet field and the stator rotating magnetic field rotate at different speeds, producing an alternating torque. When the rotor accelerates to a speed close to the synchronous speed, the speed of the rotor permanent magnet field approaches that of the stator rotating magnetic field. The speed of the stator rotating magnetic field is slightly higher than that of the rotor permanent magnet field, and their interaction produces a torque that pulls the rotor into synchronous operation. In the synchronous operating state, no current is generated in the rotor winding. At this point, only the permanent magnets on the rotor generate a magnetic field, which interacts with the stator rotating magnetic field to produce driving torque. Thus, it can be seen that the permanent magnet synchronous motor relies on the asynchronous torque of the rotor winding to start. After starting is complete, the rotor winding no longer plays a role, and the driving torque is produced by the interaction of the magnetic fields generated by the permanent magnets and the stator winding.

DANAHER motor principle

A stepper motor is an open-loop control component that converts electrical pulse signals into angular or linear displacement. Under non-overload conditions, the motor's speed and stopping position depend solely on the frequency and number of pulses, unaffected by load variations; that is, each pulse signal causes the motor to rotate by one step angle. The existence of this linear relationship, combined with characteristics such as periodic errors without cumulative error in stepper motors, makes control in areas like speed and position very simple. Although stepper motors are widely used, they cannot be used under conventional conditions like ordinary DC or AC motors. They require a control system composed of dual-ring pulse signals, power drive circuits, etc., to operate. Therefore, effectively using stepper motors is not easy, as it involves extensive professional knowledge in mechanics, motors, electronics, and computing. Nowadays, while there are indeed many manufacturers producing stepper motors, very few have specialized technical personnel capable of independent development and research. Most manufacturers have only ten to twenty employees and lack even the most basic equipment, remaining at a stage of blind imitation. This causes considerable trouble for users in product selection and usage. In view of the above situation, we have decided to take the widely used variable reluctance stepper motor as an example to describe its basic working principle, hoping to assist a broad range of users in selection, usage, and overall machine improvement.

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