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A motor speed controller

A technology of motor speed governor and potentiometer

Active Publication Date: 2016-05-11
浙江科泰电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The motor speed controller can change the voltage obtained by the motor and control the speed, but it has the following defects: the current formed by the triggering of the motor speed controller is generally triggered in the current cycle of 0°-180° and 180°-360° AC current, starting torque is small, can not meet the requirements of use

Method used

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  • A motor speed controller
  • A motor speed controller
  • A motor speed controller

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Experimental program
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Effect test

Embodiment 1

[0025] see figure 1 As shown, a motor governor provided in this embodiment includes a bidirectional thyristor Q2 connected to the motor and a signal generation and trigger circuit for controlling the bidirectional thyristor Q2, and the signal generation and trigger circuit It specifically includes: a bidirectional trigger diode Q1, an RC charging and discharging circuit, and a clamping circuit, wherein the first end of the bidirectional triggering diode Q1 is connected to the control electrode of the bidirectional thyristor Q2; the RC charging and discharging circuit includes mutual A potentiometer R and a capacitor C1 connected in series, the connection point of the potentiometer R and the capacitor C1 connected in series with the second end of the bidirectional trigger diode Q1; the end of the capacitor C1 not directly connected to the potentiometer R connected to the first anode of the bidirectional thyristor Q2; one end of the potentiometer R not directly connected to the ...

Embodiment 2

[0029] see figure 2 As shown, as a motor speed controller of the second embodiment of the present invention, on the basis of the above-mentioned embodiment 1, the potentiometer R specifically includes a resistor R1, a resistor R2, a potentiometer VR1 and a potentiometer VR2, wherein , the potentiometer VR1 is connected in series with the resistor R2 and then connected in parallel with the potentiometer VR2.

[0030] Now the working process of the described motor governor of the present embodiment is described in detail as follows:

[0031] see image 3 The AC schematic for the LN input is shown; see Figure 4 As shown, when the resistance value of the potentiometer VR2 is too large, the circuit will not conduct; see Figure 5 As shown, adjust the potentiometer VR2 from large to small, when the resistance of the potentiometer VR2 is large, when the sinusoidal current cycle on the LN terminal is 0-180 degrees, the switching diode D1 is cut off, the RC loop is charged, and th...

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Abstract

The invention discloses a motor speed controller which comprises bidirectional controllable silicon Q2 connected with a motor, and a signal generation and trigger circuit for controlling the bidirectional controllable silicon Q2, wherein the signal generation and trigger circuit specifically comprises a bidirectional trigger diode Q1, an RC (resistor-capacitor) charge and discharge loop and a clamping circuit; the output end of the bidirectional trigger diode Q1 is connected with a control electrode of the bidirectional controllable silicon Q2; the RC charge and discharge loop comprises a potentiometer R and a capacitor C1 connected in series; a connection point for serially connecting the potentiometer R with the capacitor C1 is connected with the input end of the bidirectional trigger diode Q1; the other end of the capacitor C1 is connected with a first anode of the bidirectional controllable silicon Q2; the other end of the potentiometer R is connected with a second anode of the bidirectional controllable silicon Q2; the clamping circuit comprises a switch diode D1 and a resistor R3 connected in series, and is directly connected to the two ends of the capacitor C1 in parallel. According to the motor speed controller, a larger torque is generated when the motor is unidirectionally adjusted and controlled to be started, so that the clamping phenomenon of the motor in a starting process can be avoided.

Description

technical field [0001] The invention relates to a motor governor. In particular, it relates to a motor speed controller capable of outputting single-phase current so that the starting torque of the motor is large. Background technique [0002] Due to the advantages of simple production process and maintenance-free, AC and DC dual-purpose motors have always been the preferred motor type for electric tools and garden tools. Due to the large no-load power consumption, low efficiency, and false triggering or no triggering of voltage output Problem, generally use the potentiometer to control the conduction to control the motor speed. [0003] Chinese patent document CN202772840U discloses a motor governor, including a thyristor connected to the motor and a phase-shifting signal generation and trigger circuit for controlling the thyristor, and the phase-shifting signal generation and trigger circuit includes a one-way A phase-shift control circuit, a bidirectional phase-shift co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/16
Inventor 郑春开张先林
Owner 浙江科泰电气有限公司