Renold motor Germany Renold model Renold price

Renold motor is a discrete value control motor that converts electrical pulse excitation signals into corresponding angular or linear displacement. This motor moves one step for each input electrical pulse, so it is also called a pulse motor. It is a special micro motor that converts electrical pulse signals into angular displacement to control rotor rotation. It serves as an actuator in automatic control devices. For each input pulse signal, the stepper motor advances one step, hence it is also known as a pulse motor. Stepper motors are widely used in peripheral equipment of digital computers, as well as in printers, plotters, and disk drives. The drive power supply of a stepper motor consists of a variable frequency pulse signal source, a pulse distributor, and a pulse amplifier, which provide pulse current to the motor windings. The operating performance of a stepper motor depends on the good coordination between the motor and the drive power supply. The advantages of stepper motors include no cumulative error, simple structure, convenient use and maintenance, low manufacturing cost, and high ability to drive load inertia. They are suitable for small and medium-sized machine tools and applications with low speed and precision requirements. The disadvantages are lower efficiency, significant heat generation, and occasional "step loss".

Renold motor maintenance methods

The radial gap between the motor rotor and stator is called the air gap. Generally, the air gap of a motor is between 0.25-0.8mm. After disassembling the motor and troubleshooting, it is essential to assemble according to the original end cover marks to prevent rubbing after reassembly. If the noise of brushed or brushless geared hub motors increases, or if the gears inside the motor are replaced, all gear tooth surfaces should be fully coated with lubricating grease, typically using No. 3 grease or the lubricant specified by the manufacturer. Before assembling a brushed motor, check the elasticity of the springs in the brush holders, ensure there is no friction between the carbon brushes and the brush holders, verify that the carbon brushes can reach their maximum travel within the brush holders, and pay attention to the correct positioning of the carbon brushes relative to the commutator to avoid jamming or damaging the brushes or brush holders.

Renold motor performance

Under-ring lubrication is an improved lubrication method, divided into under-ring oil lubrication and under-ring oil-air lubrication. When implementing under-ring oil or oil-air lubrication, the lubricating oil or oil-air mixture is injected into the lubrication zone from the inner ring of the bearing. Under the action of centrifugal force, the lubricating oil reaches the bearing lubrication zone more easily, resulting in better performance than ordinary jet lubrication and oil-air lubrication, and further increasing the bearing speed. The main factors affecting the high-speed performance of angular contact ball bearings are the increased centrifugal force and gyroscopic torque acting on the balls at high speeds. Increased centrifugal force increases friction between the balls and raceways, while increased gyroscopic torque causes sliding friction between the balls and raceways, intensifying bearing friction and heat generation, thereby reducing bearing life. To improve the high-speed performance of bearings, two methods are commonly used: one is to reduce the diameter of the balls, such as using standardized 71900 series spindle bearings; the other is to use new ceramic (Si3N4) materials for the balls. Since the density of Si3N4 ceramic material is only 40% of that of bearing steel, the high-speed performance of these bearings is significantly higher than that of all-steel bearings. Rolling bearings used on spindles require preload to suppress vibration and sliding during high-speed revolution and rotation of the balls, and to improve rotational accuracy. Preload methods mainly include constant position preload and constant force preload.

Renold motor structure

A motor can be regarded as a DC motor with electronic commutation replacing mechanical commutation, mainly consisting of a synchronous motor body, a power electronic inverter, a rotor position detector, and a controller. The rotor of the synchronous motor is mainly composed of permanent magnets and magnetic conductors. A permanent magnet brushless DC motor mainly consists of a permanent magnet motor body, a rotor position sensor, and an electronic commutation circuit. In terms of structure and control method, permanent magnet brushless DC motors have many similarities with traditional DC motors: the rotor with permanent magnets replaces the stator poles of a brushed DC motor; the stator with multi-phase windings replaces the armature; and an electronic commutator composed of a solid-state inverter and shaft position detector replaces the mechanical commutator and brushes.

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