High Quality Sintered Neodymium Permanent Ring Magnet for DC Motor/Brushless Motor /Step Motor /Servo Motor

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1、 Product features

Main features of joint module:

1. Compact structure: compact stator and rotor structure, built-in encoder and driver;

2. Fast response: small moment of inertia, fast dynamic response;

3. Precise control: low torque ripple, easy to speed control and precise positioning;

4. Small and precise: the outer diameter is only 115mm, the large and medium-sized empty wire holes, ultra light weight, effectively ensuring the reasonable self weight ratio of the robot;

5. Ready to use: it can be directly connected with the joint module and the driving mechanical arm.

2、Application scenario

The permanent magnet brushless dc motor can provide multiple degrees of freedom for various machines. For example, bionic robot, cooperative robot, welding robot, exoskeleton robot and other fields meet the needs of different industries, such as industry, scientific research, commerce, medical treatment, etc., with wide application, stable quality and large shipment.

3、  Parameter table

The above parameters are for reference only. Our product technology is constantly updated and upgraded. At the same time, we also accept the customization and development of customers.

4、Product details

5、Factory and qualification

7、 After sales service

1、 What work should be done before starting the servo motor            

1) Measure the insulation resistance (not less than 0.5m for low voltage motor).            

2) Measure the power supply voltage, check whether the motor wiring is correct and whether the power supply voltage meets the requirements.            

3) Check whether the starting equipment is in good condition.            

4) Check whether the fuse is suitable.            

5) Check whether the motor grounding and zero connection are good.            

6) Check the drive for defects.           

7) Check whether the environment of the motor is suitable, and remove inflammables and other sundries.            

2、 What are the causes of overheating of servo motor bearings           

 Motor itself:            

1) The inner and outer rings of the bearing fit too tightly.            

2) There are some problems in the shape and position tolerance of parts, such as the coaxiality of the base, end cover and shaft.            

3) Improper selection of bearings.            

4) The bearing is not well lubricated or cleaned, and there are impurities in the grease.            

5) Shaft current.            

In terms of use:            

1) Improper installation of the unit, such as the motor shaft and the driven device shaft coaxiality requirements.            

2) The pulley is pulled too tight.            

3) Bearing maintenance is not good, grease is insufficient or beyond the service life, dry and deteriorated.            

3、 What is the cause of unbalanced three-phase current of servo motor            

1) The three-phase voltage is unbalanced.            

2) Poor welding or poor contact of a phase branch in the motor            

3) Turn to turn short circuit or phase to phase short circuit of motor winding resistance.           

 4) Wrong wiring.

4、 How to control the speed of servo motor           

 The servo motor is a typical closed-loop feedback system. The reduction gear set is driven by a motor, and its terminal (output end) drives a linear proportional potentiometer for position detection. The potentiometer converts the angular coordinate into a proportional voltage and feeds it back to the control circuit board. The control circuit board compares it with the input control pulse signal to generate correction pulse, and drives the motor forward or backward The output position of the gear set is consistent with the expected value, and the correction pulse tends to zero, so as to achieve the purpose of accurate positioning and constant speed of the servo motor.            

5、 Observe whether there is spark between carbon brush and commutator and the extent of spark when the motor is running            

1. If the surface of the commutator is flat, it is unnecessary to repair it in most cases;            

2. No spark. No repair;           

 3. If there are more than 4 tiny sparks and 1-3 large sparks, it is not necessary to remove the armature, only the carbon brush commutator of sandpaper grinding is needed;            

4. If there are more than 4 large sparks, the commutator needs to be ground with sandpaper, and the carbon brush and armature must be removed.

6、 How to align the encoder phase of servo motor with the zero point of rotor pole phase  

 1. Phase alignment of incremental encoder           

 The alignment method between the phase of UVW electronic commutation signal of incremental encoder with commutation signal and rotor pole phase, or electrical angle phase, is as follows:           

 (1) Direct current less than the rated current is applied to the UV winding of the motor with a DC power supply, u in and V out, and the motor shaft is oriented to a balanced position;            

(2) The U-phase signal and z-phase signal of the encoder are observed by oscilloscope;           

 (3) Adjust the relative position of encoder shaft and motor shaft;            

(4) While adjusting, observe the U-phase signal jump edge and Z signal of encoder until Z signal is stable at high level (default Z signal is low level), lock the relative position relationship between encoder and motor;           

 (5) Twist the motor shaft back and forth. After the motor shaft is released, if the Z signal can be stabilized at a high level every time the motor shaft returns to the balanced position, then the alignment is effective.           

 2. Phase alignment of absolute encoder            

The phase alignment of absolute encoder has little difference for single turn and multi turn. In fact, the phase alignment of encoder detection phase and motor electrical angle is within one circle. At present, a very practical method is to use the EEPROM inside the encoder to store the measured phase after the encoder is randomly installed on the motor shaft            

(1) The encoder is randomly installed on the motor, that is, the encoder shaft and motor shaft are consolidated, and the encoder shell and motor shell are fixed;            

(2) Direct current less than the rated current is applied to the UV winding of the motor with a DC power supply, u in and V out, and the motor shaft is oriented to a balanced position;            

(3) A servo driver is used to read the single turn position value of the absolute encoder, which is stored in the EEPROM which records the initial phase of the motor electrical angle;            

(4) The alignment process ends.            

7、 The phenomenon of servo motor running in maintenance            

During feeding, the phenomenon of shifting occurs, and the speed measurement signal is unstable, such as the encoder has cracks; the wiring terminals are not in good contact, such as screw loosening; when the movement occurs at the moment of reversing from the positive direction to the opposite direction, it is generally caused by the reverse gap of the feed transmission chain or the excessive service driving gain;

In our years of brand development history, we have insisted on building the excellent performance of High Quality Sintered Neodymium Permanent Ring Magnet for DC Motor/Brushless Motor /Step Motor /Servo Motor with leading technological strength. Serving the country by industry is a sacred mission entrusted to us by history and our unremitting pursuit. Looking forward for your cooperation.

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