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One motor runs fine, other one doesn't

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Spamantha
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Last seen: 2 years 9 months ago
Joined: 2021-06-11 23:15
Posts: 3
One motor runs fine, other one doesn't

Hi, all.

I've been planning to make an R/C lawn mower for a long time and finally purchased two 10" brushless scooter hub motors and Flipsky Mini FSESC 4.20 speed controllers.

The idea is to use two independent drives in a v-tail configuration together wit a free rotating front wheel. Pretty basic stuff with normal r/c gear.

Now the tricky part. I set the ESCs and motors up in a rig where I can rotate them freely while adjusting parameters. Tuning phase is carried out with a 3 cell 2,2Ah LiPo-battery, controlled via usb-port.

First setup worked nice, only had to tweak FOC parameters a little to get the motor spinning. Runs nice by keyboard command.

The second motor was treated in absolutely same manner. ID run found out the resistance, lambda and hall sensors. I wrote the parameters to ESC and tried controlling the motor by keyboard with no luck! Just some rattle with no movement whatsoever. I compared those two configurations and found out that there are some differences in them.

Below are the differences. Left column is for the working setup and right column failed. I got the failing motor to run while doing the ID run.

foc_current_kp

0.171

0.1669

foc_current_ki

98.13

104.84

     

foc_motor_l

0.00017103

0.00016692

     

foc_motor_r

0.09813

0.1048

foc_motor_flux_linkage

0.020348

0.015623

foc_observer_gain

2.42e+06

4.1e+06

foc_hall_table__0

255

255

foc_hall_table__1

199

199

foc_hall_table__2

66

68

foc_hall_table__3

33

33

foc_hall_table__4

133

133

foc_hall_table__5

166

165

foc_hall_table__6

99

101

foc_hall_table__7

255

255

m_invert_direction

0

1

Last line is obvious, because I need left and right side motors. I subsequently loaded the parameters from motor 1 (below) to the other one to see if it would run with those parameters. No luck.

 

<?xml version="1.0" encoding="UTF-8"?>
<MCConfiguration>
    <pwm_mode>1</pwm_mode>
    <comm_mode>0</comm_mode>
    <motor_type>2</motor_type>
    <sensor_mode>0</sensor_mode>
    <l_current_max>10</l_current_max>
    <l_current_min>-10</l_current_min>
    <l_in_current_max>40</l_in_current_max>
    <l_in_current_min>-10</l_in_current_min>
    <l_abs_current_max>15</l_abs_current_max>
    <l_min_erpm>-1000</l_min_erpm>
    <l_max_erpm>1000</l_max_erpm>
    <l_erpm_start>0.5</l_erpm_start>
    <l_max_erpm_fbrake>300</l_max_erpm_fbrake>
    <l_max_erpm_fbrake_cc>1500</l_max_erpm_fbrake_cc>
    <l_min_vin>8</l_min_vin>
    <l_max_vin>57</l_max_vin>
    <l_battery_cut_start>11</l_battery_cut_start>
    <l_battery_cut_end>10.5</l_battery_cut_end>
    <l_slow_abs_current>1</l_slow_abs_current>
    <l_temp_fet_start>75</l_temp_fet_start>
    <l_temp_fet_end>90</l_temp_fet_end>
    <l_temp_motor_start>85</l_temp_motor_start>
    <l_temp_motor_end>100</l_temp_motor_end>
    <l_temp_accel_dec>0.15</l_temp_accel_dec>
    <l_min_duty>0.005</l_min_duty>
    <l_max_duty>0.95</l_max_duty>
    <l_watt_max>350</l_watt_max>
    <l_watt_min>-350</l_watt_min>
    <l_current_max_scale>1</l_current_max_scale>
    <l_current_min_scale>1</l_current_min_scale>
    <l_duty_start>1</l_duty_start>
    <sl_min_erpm>150</sl_min_erpm>
    <sl_min_erpm_cycle_int_limit>1100</sl_min_erpm_cycle_int_limit>
    <sl_max_fullbreak_current_dir_change>10</sl_max_fullbreak_current_dir_change>
    <sl_cycle_int_limit>62</sl_cycle_int_limit>
    <sl_phase_advance_at_br>0.8</sl_phase_advance_at_br>
    <sl_cycle_int_rpm_br>80000</sl_cycle_int_rpm_br>
    <sl_bemf_coupling_k>600</sl_bemf_coupling_k>
    <hall_table__0>-1</hall_table__0>
    <hall_table__1>1</hall_table__1>
    <hall_table__2>3</hall_table__2>
    <hall_table__3>2</hall_table__3>
    <hall_table__4>5</hall_table__4>
    <hall_table__5>6</hall_table__5>
    <hall_table__6>4</hall_table__6>
    <hall_table__7>-1</hall_table__7>
    <hall_sl_erpm>2000</hall_sl_erpm>
    <foc_current_kp>0.171</foc_current_kp>
    <foc_current_ki>98.13</foc_current_ki>
    <foc_f_sw>25000</foc_f_sw>
    <foc_dt_us>0.12</foc_dt_us>
    <foc_encoder_inverted>0</foc_encoder_inverted>
    <foc_encoder_offset>180</foc_encoder_offset>
    <foc_encoder_ratio>7</foc_encoder_ratio>
    <foc_encoder_sin_gain>1</foc_encoder_sin_gain>
    <foc_encoder_cos_gain>1</foc_encoder_cos_gain>
    <foc_encoder_sin_offset>1.65</foc_encoder_sin_offset>
    <foc_encoder_cos_offset>1.65</foc_encoder_cos_offset>
    <foc_encoder_sincos_filter_constant>0.5</foc_encoder_sincos_filter_constant>
    <foc_sensor_mode>2</foc_sensor_mode>
    <foc_pll_kp>2000</foc_pll_kp>
    <foc_pll_ki>30000</foc_pll_ki>
    <foc_motor_l>0.00017103</foc_motor_l>
    <foc_motor_ld_lq_diff>0</foc_motor_ld_lq_diff>
    <foc_motor_r>0.09813</foc_motor_r>
    <foc_motor_flux_linkage>0.020348</foc_motor_flux_linkage>
    <foc_observer_gain>2.42e+06</foc_observer_gain>
    <foc_observer_gain_slow>0.05</foc_observer_gain_slow>
    <foc_duty_dowmramp_kp>10</foc_duty_dowmramp_kp>
    <foc_duty_dowmramp_ki>200</foc_duty_dowmramp_ki>
    <foc_openloop_rpm>700</foc_openloop_rpm>
    <foc_openloop_rpm_low>0</foc_openloop_rpm_low>
    <foc_d_gain_scale_start>0.9</foc_d_gain_scale_start>
    <foc_d_gain_scale_max_mod>0.2</foc_d_gain_scale_max_mod>
    <foc_sl_openloop_hyst>0.1</foc_sl_openloop_hyst>
    <foc_sl_openloop_time_lock>0</foc_sl_openloop_time_lock>
    <foc_sl_openloop_time_ramp>0.1</foc_sl_openloop_time_ramp>
    <foc_sl_openloop_time>0.05</foc_sl_openloop_time>
    <foc_hall_table__0>255</foc_hall_table__0>
    <foc_hall_table__1>199</foc_hall_table__1>
    <foc_hall_table__2>66</foc_hall_table__2>
    <foc_hall_table__3>33</foc_hall_table__3>
    <foc_hall_table__4>133</foc_hall_table__4>
    <foc_hall_table__5>166</foc_hall_table__5>
    <foc_hall_table__6>99</foc_hall_table__6>
    <foc_hall_table__7>255</foc_hall_table__7>
    <foc_hall_interp_erpm>500</foc_hall_interp_erpm>
    <foc_sl_erpm>4000</foc_sl_erpm>
    <foc_sample_v0_v7>0</foc_sample_v0_v7>
    <foc_sample_high_current>0</foc_sample_high_current>
    <foc_sat_comp>0</foc_sat_comp>
    <foc_temp_comp>0</foc_temp_comp>
    <foc_temp_comp_base_temp>25</foc_temp_comp_base_temp>
    <foc_current_filter_const>0.1</foc_current_filter_const>
    <foc_cc_decoupling>2</foc_cc_decoupling>
    <foc_observer_type>0</foc_observer_type>
    <foc_hfi_voltage_start>20</foc_hfi_voltage_start>
    <foc_hfi_voltage_run>4</foc_hfi_voltage_run>
    <foc_hfi_voltage_max>10</foc_hfi_voltage_max>
    <foc_sl_erpm_hfi>2000</foc_sl_erpm_hfi>
    <foc_hfi_start_samples>65</foc_hfi_start_samples>
    <foc_hfi_obs_ovr_sec>0.001</foc_hfi_obs_ovr_sec>
    <foc_hfi_samples>1</foc_hfi_samples>
    <gpd_buffer_notify_left>200</gpd_buffer_notify_left>
    <gpd_buffer_interpol>0</gpd_buffer_interpol>
    <gpd_current_filter_const>0.1</gpd_current_filter_const>
    <gpd_current_kp>0.03</gpd_current_kp>
    <gpd_current_ki>50</gpd_current_ki>
    <s_pid_kp>0.004</s_pid_kp>
    <s_pid_ki>0.004</s_pid_ki>
    <s_pid_kd>0.0001</s_pid_kd>
    <s_pid_kd_filter>0.2</s_pid_kd_filter>
    <s_pid_min_erpm>900</s_pid_min_erpm>
    <s_pid_allow_braking>1</s_pid_allow_braking>
    <s_pid_ramp_erpms_s>-1</s_pid_ramp_erpms_s>
    <p_pid_kp>0.03</p_pid_kp>
    <p_pid_ki>0</p_pid_ki>
    <p_pid_kd>0.0004</p_pid_kd>
    <p_pid_kd_filter>0.2</p_pid_kd_filter>
    <p_pid_ang_div>1</p_pid_ang_div>
    <cc_startup_boost_duty>0.01</cc_startup_boost_duty>
    <cc_min_current>0.05</cc_min_current>
    <cc_gain>0.0046</cc_gain>
    <cc_ramp_step_max>0.04</cc_ramp_step_max>
    <m_fault_stop_time_ms>500</m_fault_stop_time_ms>
    <m_duty_ramp_step>0.02</m_duty_ramp_step>
    <m_current_backoff_gain>0.5</m_current_backoff_gain>
    <m_encoder_counts>8192</m_encoder_counts>
    <m_sensor_port_mode>0</m_sensor_port_mode>
    <m_invert_direction>0</m_invert_direction>
    <m_drv8301_oc_mode>0</m_drv8301_oc_mode>
    <m_drv8301_oc_adj>16</m_drv8301_oc_adj>
    <m_bldc_f_sw_min>3000</m_bldc_f_sw_min>
    <m_bldc_f_sw_max>35000</m_bldc_f_sw_max>
    <m_dc_f_sw>25000</m_dc_f_sw>
    <m_ntc_motor_beta>3380</m_ntc_motor_beta>
    <m_out_aux_mode>0</m_out_aux_mode>
    <m_motor_temp_sens_type>1</m_motor_temp_sens_type>
    <m_ptc_motor_coeff>0.61</m_ptc_motor_coeff>
    <m_hall_extra_samples>1</m_hall_extra_samples>
    <si_motor_poles>14</si_motor_poles>
    <si_gear_ratio>1</si_gear_ratio>
    <si_wheel_diameter>0.25</si_wheel_diameter>
    <si_battery_type>0</si_battery_type>
    <si_battery_cells>3</si_battery_cells>
    <si_battery_ah>2.2</si_battery_ah>
    <motor_brand>BangGood</motor_brand>
    <motor_model>FH36V30H210508524</motor_model>
    <motor_weight>3054</motor_weight>
    <motor_poles>14</motor_poles>
    <motor_sensor_type>1</motor_sensor_type>
    <motor_description>&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
&lt;html&gt;&lt;head&gt;&lt;meta name=&quot;qrichtext&quot; content=&quot;1&quot; /&gt;&lt;style type=&quot;text/css&quot;&gt;
p, li { white-space: pre-wrap; }
&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'Roboto'; font-size:12pt; font-weight:400; font-style:normal;&quot;&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;a href=&quot;https://www.banggood.com/350W-9_8-Inch-Scooter-Motor-Explosion-Proof-Brushless-Hub-Motor-Wheels-Tire-Ideal-Replacement-for-M365-Electric-Scooter-p-1737973.html?utm_design=18&amp;amp;utm_email=1623859212_2324&amp;amp;utm_source=emarsys&amp;amp;utm_medium=Shipoutinform190813&amp;amp;utm_campaign=trigger-logistics&amp;amp;utm_content=leander&amp;amp;sc_src=email_2671705&amp;amp;sc_eh=aebfe5b02aea5b6a1&amp;amp;sc_llid=30108438&amp;amp;sc_lid=104858042&amp;amp;sc_uid=MJ3QPxij5i&amp;amp;cur_warehouse=CN&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif'; font-weight:600; text-decoration: underline; color:#0000ff;&quot;&gt;https://www.banggood.com/350W-9_8-Inch-Scooter-Motor-Explosion-Proof-Brushless-Hub-Motor-Wheels-Tire-Ideal-Replacement-for-M365-Electric-Scooter-p-1737973.html?utm_design=18&amp;amp;utm_email=1623859212_2324&amp;amp;utm_source=emarsys&amp;amp;utm_medium=Shipoutinform190813&amp;amp;utm_campaign=trigger-logistics&amp;amp;utm_content=leander&amp;amp;sc_src=email_2671705&amp;amp;sc_eh=aebfe5b02aea5b6a1&amp;amp;sc_llid=30108438&amp;amp;sc_lid=104858042&amp;amp;sc_uid=MJ3QPxij5i&amp;amp;cur_warehouse=CN&lt;/span&gt;&lt;/a&gt; &lt;/p&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif'; font-weight:600;&quot;&gt;Specification:&lt;/span&gt; &lt;/p&gt;
&lt;table border=&quot;0&quot; style=&quot; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px;&quot; width=&quot;0&quot; cellspacing=&quot;0&quot; cellpadding=&quot;0&quot;&gt;
&lt;tr&gt;
&lt;td width=&quot;295&quot; style=&quot; vertical-align:top; padding-left:0; padding-right:0; padding-top:0; padding-bottom:0;&quot;&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif';&quot;&gt;Material&lt;/span&gt; &lt;/p&gt;&lt;/td&gt;
&lt;td width=&quot;295&quot; style=&quot; vertical-align:top; padding-left:0; padding-right:0; padding-top:0; padding-bottom:0;&quot;&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif';&quot;&gt;Aluminum Alloy + Rubber&lt;/span&gt; &lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;
&lt;td style=&quot; vertical-align:top; padding-left:0; padding-right:0; padding-top:0; padding-bottom:0;&quot;&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif';&quot;&gt;Color&lt;/span&gt; &lt;/p&gt;&lt;/td&gt;
&lt;td style=&quot; vertical-align:top; padding-left:0; padding-right:0; padding-top:0; padding-bottom:0;&quot;&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif';&quot;&gt;Black&lt;/span&gt; &lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;
&lt;td style=&quot; vertical-align:top; padding-left:0; padding-right:0; padding-top:0; padding-bottom:0;&quot;&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif';&quot;&gt;Motor Power&lt;/span&gt; &lt;/p&gt;&lt;/td&gt;
&lt;td style=&quot; vertical-align:top; padding-left:0; padding-right:0; padding-top:0; padding-bottom:0;&quot;&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif';&quot;&gt;350W&lt;/span&gt; &lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;
&lt;td style=&quot; vertical-align:top; padding-left:0; padding-right:0; padding-top:0; padding-bottom:0;&quot;&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif';&quot;&gt;Outer Diameter&lt;/span&gt; &lt;/p&gt;&lt;/td&gt;
&lt;td style=&quot; vertical-align:top; padding-left:0; padding-right:0; padding-top:0; padding-bottom:0;&quot;&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif';&quot;&gt;25cm/9.8inch&lt;/span&gt; &lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;
&lt;td style=&quot; vertical-align:top; padding-left:0; padding-right:0; padding-top:0; padding-bottom:0;&quot;&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif';&quot;&gt;Package weight&lt;/span&gt; &lt;/p&gt;&lt;/td&gt;
&lt;td style=&quot; vertical-align:top; padding-left:0; padding-right:0; padding-top:0; padding-bottom:0;&quot;&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif';&quot;&gt;Approx. 3054g/107.7oz&lt;/span&gt; &lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif'; font-weight:600;&quot;&gt;Features:&lt;/span&gt; &lt;/p&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif';&quot;&gt;- Ideal replacement for Xiaomi M365 electric scooter tire.&lt;/span&gt; &lt;/p&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif';&quot;&gt;- Explosion-proof tire, silent, honeycomb shock absorption.&lt;/span&gt; &lt;/p&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif';&quot;&gt;- Safety and environmental protection.&lt;/span&gt; &lt;/p&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif';&quot;&gt;- Anti-shock, highly elastic rubber material.&lt;/span&gt; &lt;/p&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif';&quot;&gt;- Anti-wear for long service life, &lt;/span&gt; &lt;/p&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif';&quot;&gt;- The performance of the motor is stable, strong and powerful.&lt;/span&gt;&lt;/p&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif'; font-weight:600;&quot;&gt;Package included:&lt;/span&gt; &lt;/p&gt;
&lt;p style=&quot; margin-top:12px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Times New Roman,serif';&quot;&gt;1 x Xiaomi Scooter Motor Wheels Tire&lt;/span&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</motor_description>
    <motor_loss_torque>0.03</motor_loss_torque>
    <motor_quality_bearings>0</motor_quality_bearings>
    <motor_quality_magnets>0</motor_quality_magnets>
    <motor_quality_construction>0</motor_quality_construction>
    <motor_quality_description>&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
&lt;html&gt;&lt;head&gt;&lt;meta name=&quot;qrichtext&quot; content=&quot;1&quot; /&gt;&lt;style type=&quot;text/css&quot;&gt;
p, li { white-space: pre-wrap; }
&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'Roboto'; font-size:12pt; font-weight:400; font-style:normal;&quot;&gt;
&lt;p style=&quot; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;Some comments about the motor quality. Images can be added as well.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</motor_quality_description>
    <bms.type>1</bms.type>
    <bms.t_limit_start>45</bms.t_limit_start>
    <bms.t_limit_end>65</bms.t_limit_end>
    <bms.soc_limit_start>0.05</bms.soc_limit_start>
    <bms.soc_limit_end>0</bms.soc_limit_end>
</MCConfiguration>

Motors are from Banggood, like these:

https://www.banggood.com/350W-9_8-Inch-Scooter-Motor-Explosion-Proof-Bru...

Both ESCs straight out of the box, no changes to firmware. Hall sensor connections are soldered, motor leads are connected by srew terminals.

What should I try next? Maybe cross check the motors with different ESCs to see if the problem is motor or ESC related? I guess the warranty is void the same second as I cut the original motor connectors off.

I can run some tests and report the results if it helps.

Thanks for any help in advance!

 

district9prawn
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Last seen: 2 years 2 weeks ago
Joined: 2018-04-26 12:18
Posts: 123

It sounds like the motors and escs are physically ok since the second one can still spin in openloop mode during the flux linkage detection. 

If the motors are same model and kv, seems strange that one should be 0.02mwb and the other one 0.015. This measurement should give quite consistent results. 

Spamantha
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Last seen: 2 years 9 months ago
Joined: 2021-06-11 23:15
Posts: 3

Update:

I just switched the motors and ESCs across and the problem persists with ESC #2 (I have felt pen markings on motors and ESCs not to mix them up accidentally). Seems to me that ESC is shot. Any other conclusions? What should I do? I think updating the firmware isn't the solution, because they are from the very same batch, same usb cable etc.

Maybe I'll just try to get the ESC replaced by BangGood?

Spamantha
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Last seen: 2 years 9 months ago
Joined: 2021-06-11 23:15
Posts: 3

Update. I mailed with Bangood back and forth. At the end they asked me to make a video of the problem. Here goes: https://youtu.be/AldXjHqyoGg.

They answered me quickly with apologies and told me that their tech department is looking at the problem and they will get in touch in a couple of days.

A week passed, no contact. After that I asked myself if they had reached the same conclusion than I.

Here's a quote of the response I got:

Thank you for your email and order..

We are terribly sorry to hear that your 1349277 does not work anymore, and we totally understand your anxiety.

As we know, each product has its own life span. After months of using, the product has greater possibility to get damaged. For this product, because the time is over 1 month, it is no longer under warranty. We are sorry for this situation.

According to Banggood warranty policy, we are sorry to tell you that we are not able to provide any resend, refund or repair service.

But our aspiration is to keep you as one of our most valued customers. We would like to send you 2000 BG points (100 points1 USD) as goodwill. you may use the points for next purchasing.

Please also kindly note that the points can be exchanged to give up to 15%-20% off your order and can not be applied to the following circumstances which are already in discount: promotional products, snap-up products.

For the defective product, we suggest you to repair the product or buy a replacement in local store. Simultaneously, we will send your feedback to our supplier.

Sorry for the inconvenience caused and looking forward to your reply.

Best regards,

Banggood Team

Bloody Wankers!

That's what I told them too, and the point offer was raised to 4000 points XD.

Please avoid Flipsky and Banggood. They're both rubbish.

S